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586 Commits

Author SHA1 Message Date
f009e6754d Branch at revision 46530
[SVN r46531]
2008-06-19 18:57:10 +00:00
67f3ca090a Fixed value_init test + doc, according to change of boost::initialized_value, revision [45685]
[SVN r45686]
2008-05-23 16:48:10 +00:00
8efae71f4a Changed boost::initialized_value from a class to an instance, to make its use more convenient, as discussed with Fernando.
[SVN r45685]
2008-05-23 16:46:43 +00:00
ad0bcf4a00 result_of implementation that makes use of C++0x decltype, from Daniel Walker. Fixes #862.
[SVN r45256]
2008-05-09 22:08:46 +00:00
f1c86c35c4 Merge in documentation fixes. Apart from the change to optional's documenation
Jamfile, which I included by mistake.

Fixes #1659, #1661, #1684, #1685, 1687, #1690, #1801

I wrote about this at:

http://lists.boost.org/Archives/boost/2008/04/136405.php

Merged revisions 44585-44806 via svnmerge from 
https://svn.boost.org/svn/boost/branches/doc

........
  r44585 | danieljames | 2008-04-19 16:25:27 +0100 (Sat, 19 Apr 2008) | 2 lines
  
  Fix broken link to vacpp in bjam docs. Refs #1512
........
  r44586 | danieljames | 2008-04-19 16:27:36 +0100 (Sat, 19 Apr 2008) | 2 lines
  
  Fix broken link to bcpp in bjam docs. Refs #1513
........
  r44587 | danieljames | 2008-04-19 16:33:58 +0100 (Sat, 19 Apr 2008) | 2 lines
  
  DateTime documentation - Fix a link to the serialization library. Refs #1659
........
  r44588 | danieljames | 2008-04-19 16:35:36 +0100 (Sat, 19 Apr 2008) | 2 lines
  
  Fix some links in interprocess & intrusive. Refs #1661
........
  r44589 | danieljames | 2008-04-19 16:37:39 +0100 (Sat, 19 Apr 2008) | 2 lines
  
  Fix some links in the python docs. Refs #1684.
........
  r44590 | danieljames | 2008-04-19 16:38:29 +0100 (Sat, 19 Apr 2008) | 2 lines
  
  Work around a quickbook bug which is affecting the python docs. Refs #1684.
........
  r44591 | danieljames | 2008-04-19 16:39:34 +0100 (Sat, 19 Apr 2008) | 2 lines
  
  Fix a broken link in the numeric conversion docs. Refs #1685
........
  r44592 | danieljames | 2008-04-19 16:40:45 +0100 (Sat, 19 Apr 2008) | 2 lines
  
  Fix some links in the optional docs. Refs #1687
........
  r44593 | danieljames | 2008-04-19 16:42:09 +0100 (Sat, 19 Apr 2008) | 2 lines
  
  Fix link to the hash documentation from bimap. Refs #1690
........
  r44599 | danieljames | 2008-04-19 18:07:33 +0100 (Sat, 19 Apr 2008) | 2 lines
  
  Fix a typo in the format library. Refs #1801
........
  r44600 | danieljames | 2008-04-19 19:20:59 +0100 (Sat, 19 Apr 2008) | 1 line
  
  Initialise svnmerge.
........
  r44641 | danieljames | 2008-04-20 18:59:47 +0100 (Sun, 20 Apr 2008) | 2 lines
  
  Fix the lincense url in shared container iterator documentation.
........
  r44642 | danieljames | 2008-04-20 19:00:00 +0100 (Sun, 20 Apr 2008) | 2 lines
  
  Fix image link in the mpi documentation.
........
  r44643 | danieljames | 2008-04-20 19:00:11 +0100 (Sun, 20 Apr 2008) | 2 lines
  
  Fix a typo in the spirit docs.
........
  r44644 | danieljames | 2008-04-20 19:00:23 +0100 (Sun, 20 Apr 2008) | 2 lines
  
  Escape the slash so that quickbook doesn't think it the start of an italic section, and mess up the link. Refs #1844
........
  r44647 | danieljames | 2008-04-20 19:39:47 +0100 (Sun, 20 Apr 2008) | 2 lines
  
  Fix another typo in spirit docs.
........


[SVN r44807]
2008-04-27 07:39:49 +00:00
a5b85eda07 Fix #1846.
[SVN r44705]
2008-04-21 21:42:29 +00:00
bafe37fdab Boost Exception header compilation tests added.
[SVN r44442]
2008-04-15 21:13:24 +00:00
be50b95508 Added test and fix for "convertible to bool" requirement
[SVN r44151]
2008-04-10 14:38:14 +00:00
96d573d6ca Replaced all occurrences of non-ASCII copyright symbol with '(c)' for people using non-ASCII code pages
[SVN r43992]
2008-04-02 01:42:32 +00:00
2412b864d6 Fix some inspection report issues.
[SVN r43633]
2008-03-15 18:41:51 +00:00
94865eabe6 boost exception
[SVN r43485]
2008-03-04 01:41:17 +00:00
50268d1b29 Tested the assignment of value_initialized<T>, for T being a C-style array. Related to the fix of changeset [43308]
[SVN r43309]
2008-02-18 22:13:21 +00:00
ad9108c1dc Fixed the assignment of value_initialized<T> for T being a C-style array. (The previous version would trigger a compile error in this case.)
[SVN r43308]
2008-02-18 22:11:19 +00:00
691e4b6c34 Link to people pages on the website, as they've been removed from the download.
[SVN r43209]
2008-02-10 14:56:22 +00:00
28596e678d value_init: Removed aligned_storage::address() calls, to improve TR1 compatibility, as confirmed by John Maddock. Added internal helper function, wrapper_address(), as discussed with Fernando.
[SVN r43025]
2008-01-30 22:42:23 +00:00
1beca24dd8 Removed local named variable from value_initialized::operator=, as Fernando Cacciola suggested me to avoid unnecessary named variables.
[SVN r42869]
2008-01-19 20:52:04 +00:00
721764937f value_init_test now works around Borland 5.82 bug ("Error E2015: Ambiguity..." when using initialized_value), that is fixed with a newer compiler version
[SVN r42868]
2008-01-19 20:21:18 +00:00
a511007d0f Added test and documentation for convenience class initialized_value, that was added with changeset [42815]
[SVN r42816]
2008-01-16 09:37:25 +00:00
8ce58b1675 Added convenience class initialized_value, as announced at http://article.gmane.org/gmane.comp.lib.boost.devel/169833
[SVN r42815]
2008-01-16 09:35:12 +00:00
9ed68b8321 value_init doc + test: Added revision date.
[SVN r42798]
2008-01-15 19:53:28 +00:00
79bbf71d0d Minor "beautifications" of value_init documentation, inc. placing references in order of appearance
[SVN r42779]
2008-01-14 21:46:20 +00:00
ac93de7c1b Documented value_init workaround to compiler issues, added new introduction, updated to 2003 edition of C++ Standard -- reviewed by Fernando Cacciola
[SVN r42771]
2008-01-14 18:17:30 +00:00
d731b8e1c5 Added value_init tests, testing copy construction and assignment.
[SVN r42278]
2007-12-24 22:00:37 +00:00
ac1567b3fc value_init now uses aligned_storage::address(), instead of "&x", as recommended by Fernando Cacciola (by mail)
[SVN r42277]
2007-12-24 20:42:16 +00:00
c1fd670480 Reduce header dependencies, from Shunsuke Sogame. Fixes #1535
[SVN r42234]
2007-12-21 21:18:17 +00:00
01274cf6ac value_init.hpp now no longer distinguished between workaround and non-workaround, because many compilers don't do value-initialization well. Fixed copy construction and assignment -- discussed with Fernando Cacciola
[SVN r41942]
2007-12-09 22:49:58 +00:00
8080673977 Added value_init tests if a copy function of T is called when value_initialized<T> is copied -- a case I hadn't thought of before...
[SVN r41919]
2007-12-09 11:53:08 +00:00
a470b591fb Added value_init test for an value_initialized<T> object allocated on the heap.
[SVN r41667]
2007-12-03 21:41:59 +00:00
e1a63495b6 Added missing #include to value_init_test.cpp. (My mistake!)
[SVN r41648]
2007-12-03 18:20:19 +00:00
7300ac83f1 Added value_init test for C style array of bytes
[SVN r41647]
2007-12-03 18:14:37 +00:00
882d38c2c7 Added value_init tests, based upon GCC bug report by Jonathan Wakely. Added URL to Borland bug report.
[SVN r41529]
2007-12-01 12:14:37 +00:00
33041ad664 Added tests for two more struct types to value_init_test -- discussed with Fernando Cacciola
[SVN r41436]
2007-11-28 17:19:37 +00:00
6a2aa822f8 Added value_init test for struct as used in MSVC bug report regarding value-initialization.
[SVN r41423]
2007-11-27 21:34:08 +00:00
09ab16bfc1 Checked the result of value_init test function, hoping to pinpoint exactly for what particular type T value_initialized<T> might fail, on some platforms
[SVN r41326]
2007-11-24 11:51:03 +00:00
ec46e40809 Code refactoring: removed private base classes of value_initialized, as suggested by Fernando Cacciola.
[SVN r41216]
2007-11-18 22:11:57 +00:00
b3a971e7e9 Copyright and/or License cleanup
[SVN r40890]
2007-11-07 16:08:09 +00:00
7ddb559887 Fix path to test case.
[SVN r40736]
2007-11-04 12:01:16 +00:00
ea8c99b1d5 Added a sentence with a brief explanation of the intended uses of BOOST_VERIFY.
[SVN r40731]
2007-11-03 22:47:17 +00:00
56b0846099 BOOST_VERIFY added.
[SVN r40728]
2007-11-03 20:55:22 +00:00
42e0001370 Added value_initialized<T> test, having T as aggregate POD struct. In the past, this would have triggered MSVC warning C4345; this warning is now disabled within value_init.hpp, changeset [40088]
[SVN r40089]
2007-10-16 17:06:39 +00:00
cd8f85afee Disabled MSVC warning C4345, in response to Gennadiy Rozental, Boost Developer mailing list, "[utility] value_init warning", October 14, 2007. Push'n'pop reminder from Paul A Bristow taken into account.
[SVN r40088]
2007-10-16 17:00:28 +00:00
bddd52c4b9 Fixed bug preventing compilation on Tru64/CXX.
[SVN r39918]
2007-10-11 07:36:41 +00:00
8f03aeac4e Added unit test to make sure that Visual C++ 7.1 ICE reported by Ralf W. Grosse-Kunstleve (Boost Developers mailing list, subject "utility/value_init.hpp: VC 7.1 ICE & workaround") will not occur anymore.
[SVN r39309]
2007-09-16 09:48:28 +00:00
3bb2568fad Visual C++ 7.1 ICE workaround by Ralf W. Grosse-Kunstleve added to ~const_T_base() as well. See also Boost Developers mailing list, subject "utility/value_init.hpp: VC 7.1 ICE & workaround"
[SVN r39308]
2007-09-16 09:33:34 +00:00
01e91a3799 work around Visual C++ 7.1 internal compiler error
[SVN r39302]
2007-09-15 23:11:50 +00:00
55f3c351a3 Added MSVC workaround to value_initialized, as described by ticket #1217, proposed at the Boost Developers mailing list, and discussed with Fernando Cacciola.
[SVN r39157]
2007-09-07 17:17:09 +00:00
3f72b10182 Remove V1 Jamfiles
[SVN r38516]
2007-08-08 19:02:26 +00:00
71cb8cb574 broken msvc name look-up getting confused about which detail namespace
[SVN r38511]
2007-08-08 18:05:24 +00:00
c950825ef4 - overloads apply for array construction
- adds support for zero arguments
- lets apply return the result of the new-expression
- revises the preprocessing code


[SVN r38101]
2007-06-26 23:07:25 +00:00
66ca84a45d Update result_of information
[SVN r38024]
2007-06-18 12:48:37 +00:00
06404f7d39 Improved empty_base
[SVN r37754]
2007-05-23 22:48:42 +00:00
2d860e2574 Fix result_of's handling of F(void).
[SVN r37140]
2007-03-05 15:25:16 +00:00
66514f61ff fix result_of ambiguity error for nullary functions
[SVN r36773]
2007-01-24 06:44:20 +00:00
63cde4d3fd slightly modified implementation works around msvc 7.1/8.0 compiler bugs
[SVN r36668]
2007-01-08 20:38:51 +00:00
1950f292df Merge fixed links from RC_1_34_0.
[SVN r36660]
2007-01-07 23:50:56 +00:00
92a0602190 Fixed license & copyright issues and converted to HTML 4.01
[SVN r36280]
2006-12-05 21:11:21 +00:00
c9a3ab1d04 Linked to current_function.html
[SVN r36268]
2006-12-04 20:31:38 +00:00
0782034333 Allow building of shared versions of some Boost.Test libraries.
Adjust tests to use always use static linking to Boost.Test, since
linking to the shared version requires test changes.

Patch from Juergen Hunold.


[SVN r35989]
2006-11-10 19:09:56 +00:00
0808883f3c License/copyright edits
[SVN r35958]
2006-11-09 20:34:33 +00:00
2f69501e55 Add copyright, license
[SVN r35905]
2006-11-07 19:11:57 +00:00
5b83f641a8 Removed unneeded semicolon.
[SVN r35636]
2006-10-16 18:01:40 +00:00
c730ab4ffb Parameter library Workarounds for Borland and MSVC
Parameter library explicit markup for expected failures

value_init.hpp:
  Borland workarounds
  Use angle-includes consistently


[SVN r35084]
2006-09-13 03:00:18 +00:00
e55610a0d0 Some additional functions added to optional (being new there won't be regressions)
[SVN r34411]
2006-06-26 18:01:38 +00:00
bf968794c9 Fixed an ambiguity.
[SVN r34403]
2006-06-26 01:58:38 +00:00
ce6e9c6698 Digital Mars support (Pavel Vozenilek)
[SVN r34373]
2006-06-22 12:47:19 +00:00
7ac180ed54 Use forwarding to get SFINAE effect in some common use cases.
Rename detail::result_of to detail::result_of_impl to avoid surprises
when result_of is used from within boost::detail.


[SVN r33981]
2006-05-16 22:55:27 +00:00
271ea9e901 Borland 5.81 fix (Alisdair Meredith)
[SVN r33161]
2006-02-27 21:57:38 +00:00
7cd572a326 VC++ warning suppression
[SVN r33001]
2006-02-18 23:03:14 +00:00
90c56ba2ce Update for BCB2006
[SVN r32865]
2006-02-12 20:16:31 +00:00
a5439500f5 Remove dead code, use Boost.Test rather than asserts.
[SVN r32861]
2006-02-12 18:58:08 +00:00
c0f0a4f51d Try again with DMC patch: last attempt broke Borland C++ Builder, so use implicit casts with protected rather than private bases.
[SVN r32524]
2006-02-03 11:00:23 +00:00
7594e00460 Added explicit static_casts when casting *this to a reference-to-base-class: it keeps Digital Mars happy apparently.
[SVN r32413]
2006-01-25 10:45:26 +00:00
f66e844ff1 Merged from Version_1_33_1
[SVN r31949]
2005-12-08 03:23:02 +00:00
62e8cc2b36 Attempted portability fix for Sun compilers
[SVN r31904]
2005-12-04 18:47:02 +00:00
30236f8915 Made the Boost logo link to the home page
[SVN r31112]
2005-09-25 21:54:19 +00:00
155e787ea3 Fix reporting of enable_if tests
[SVN r31060]
2005-09-20 18:35:26 +00:00
1d60d49136 Large patch from Ulrich Eckhardt to fix support for EVC++ 4.
[SVN r30670]
2005-08-25 16:27:28 +00:00
2dffdac9fe Disabiguated the detail namespace.
[SVN r30558]
2005-08-12 19:06:10 +00:00
ddf00eb29d Merged from 1.33.0 release
[SVN r30540]
2005-08-12 13:02:37 +00:00
0a6acd8ce8 Fix broken links
[SVN r30403]
2005-08-03 13:01:57 +00:00
745322e797 Fix broken links
[SVN r30401]
2005-08-03 12:25:30 +00:00
9f10fc03ce More Parameter library reference edits
[SVN r30276]
2005-07-28 04:19:28 +00:00
84fbb3c896 Fix mis-nested namespace scope/#ifdef
[SVN r30159]
2005-07-18 18:50:47 +00:00
865c707756 BOOST_NO_RESULT_OF support
[SVN r30040]
2005-07-13 12:35:37 +00:00
871f3a6779 Don't use the self contained include files for boost.test as this test is linked
with the boost.test library. We end up with multiple defined symbols, otherwise.


[SVN r29559]
2005-06-14 13:46:20 +00:00
aaca5ca871 Updated Borland workaround.
[SVN r29462]
2005-06-07 09:44:19 +00:00
5a4e19989f Workaround for nonconformance to CWG issue 298, checked in on behalf of John Maddock
[SVN r29415]
2005-06-03 19:11:54 +00:00
6ea398c446 Make it clear that POD's are not zero initialised.
[SVN r29254]
2005-05-28 11:51:04 +00:00
1bd83d43e8 Improvements in type_traits have gotten MSVC 7.0 and prior down to 12 failures here
[SVN r29170]
2005-05-24 14:53:49 +00:00
5ca5b4102b Optional's Assignment fixed
[SVN r28412]
2005-04-22 13:28:34 +00:00
aca7699046 Add V2 Jamfile
[SVN r28246]
2005-04-14 13:15:46 +00:00
e702a944ca Fixes to get the tests working with the latest type traits and Boost.Test versions.
[SVN r27864]
2005-03-29 11:21:53 +00:00
a157c345ee Updated is_convertible test cases to check polymorphic-type conversions.
Added more test types to testing header.
Changed utility code to use new test header.


[SVN r27807]
2005-03-24 18:20:18 +00:00
dcb2dd4736 Removed type_traits include, added more tests
[SVN r27712]
2005-03-16 22:02:22 +00:00
ae19cd6236 work-around for Borland addressof(array) bug and associated tests
[SVN r27656]
2005-03-14 23:03:42 +00:00
3ab4d38931 Apply typo fixes from Julio M. Merino Vidal
[SVN r27513]
2005-02-27 17:28:24 +00:00
18c7fb72b5 ADL problem (with VC7.1) fixed
[SVN r27495]
2005-02-24 16:04:49 +00:00
6bb092a9b1 Add comment explaining use of assert.h
[SVN r27473]
2005-02-21 12:32:20 +00:00
f721b8b28c replaced BOOST_TEST
[SVN r27054]
2005-02-03 13:48:49 +00:00
e5ba34472d merge RC_1_32_0 fixes
[SVN r26333]
2004-11-28 04:44:21 +00:00
082ae17eaf merge RC_1_32_0 fixes
[SVN r26328]
2004-11-28 03:35:12 +00:00
dd86e09ab4 merge RC_1_32_0 tab fixes
[SVN r26327]
2004-11-28 03:27:25 +00:00
baff23116e Fixed link to function_output_iterator
[SVN r25949]
2004-10-29 19:19:20 +00:00
e549baf93a move enable_if tests into their own subdirectory
[SVN r25649]
2004-10-10 16:15:58 +00:00
30d46adcb7 bad links fixed
added myself to people


[SVN r25610]
2004-10-07 16:01:24 +00:00
e854726be0 c++boost.gif -> boost.png replacement
[SVN r25573]
2004-10-05 15:45:52 +00:00
d198bd9d96 added explicit return to main
[SVN r25387]
2004-09-24 06:17:26 +00:00
5eb23cecd0 In-place factories moved from /detail to /utility
New value_initalized tests added


[SVN r25377]
2004-09-23 17:03:54 +00:00
eff2c75bba taken care of BOOST_NO_STDC_NAMESPACE
[SVN r25345]
2004-09-22 17:18:06 +00:00
325bd73df7 In-place factories moved from /detail to /utility
New value_initalized tests added


[SVN r25313]
2004-09-21 14:54:32 +00:00
0fcc554abd Initial commit
[SVN r25178]
2004-09-17 16:53:57 +00:00
b685784155 Added new types boost::long_long_type and boost::ulong_long_type in boost/config.hpp and applied these types in place of "long long" throughout. As a result, almost all of boost now compiles cleanly with -ansi -pedantic with gcc. Changes tested with gcc 3.3, 2.95, VC7.1 and Intel 8.
[SVN r24899]
2004-09-04 10:34:49 +00:00
ac90fdc611 merge new MPL version from 'mplbook' branch
[SVN r24874]
2004-09-02 15:41:37 +00:00
51077e49f5 Fixed CW problems and refactored fail cases
[SVN r24870]
2004-09-02 13:19:50 +00:00
0c3199f72d Added my long name
[SVN r24869]
2004-09-02 12:59:42 +00:00
62675a3bcd added copyright/license
[SVN r24814]
2004-08-30 01:31:40 +00:00
c26dbaa620 Updated copyright year list, since the interface changed
[SVN r24801]
2004-08-28 20:51:19 +00:00
8201624959 Moved a template argument default for base_from_member to primary header; removed forwarding header as it's not needed anymore
[SVN r24800]
2004-08-28 20:46:17 +00:00
f2116413d6 Changed constructor templates to be generated with the Preprocessor library; added a control macro for the maximum constructor argument length
[SVN r24799]
2004-08-28 20:24:17 +00:00
b0baebeb0a fix noncopyable, finally
[SVN r24618]
2004-08-20 17:17:06 +00:00
fb943b77d5 License updates
[SVN r24597]
2004-08-19 15:19:17 +00:00
b4b39510fc ADL protection
[SVN r24595]
2004-08-19 13:12:35 +00:00
6f0f05ba12 remove forward declaration for noncopyable
[SVN r24578]
2004-08-19 02:31:29 +00:00
f0b64b6229 ADL protection
[SVN r24564]
2004-08-18 17:01:11 +00:00
4229488989 Added redirection to fix old links.
[SVN r24558]
2004-08-18 13:55:35 +00:00
acd2e6ef2b Added Daryle Walker's copyrights as requested.
[SVN r24481]
2004-08-15 10:13:49 +00:00
c26aaed71f Moved to BSL
[SVN r24446]
2004-08-12 17:13:07 +00:00
326d7ad4d7 Removed boost.org copyright assignments, and reverted to orginal author (as based on cvs history).
[SVN r24402]
2004-08-11 10:59:33 +00:00
c76a2f4aab Add my license info
[SVN r24373]
2004-08-10 13:57:30 +00:00
d8b0ff2d7e Removed Boost.org copyrights and replaced with originating authors copyright instead.
[SVN r24372]
2004-08-10 12:53:34 +00:00
996ce2d307 Updated Beman Dawes' licence statement to use the new prefered form of words.
[SVN r24370]
2004-08-10 10:34:20 +00:00
167fa4154f Eliminated unreviewed, unused, noncompiling code
[SVN r24314]
2004-08-05 18:57:39 +00:00
0c7e7c3c39 half_open_range_test removed
[SVN r24313]
2004-08-05 18:46:55 +00:00
9d8f8f41dc Include for test library fixed
[SVN r24299]
2004-08-05 09:23:05 +00:00
39c4445b39 add missing tests, reorder tests by filename
[SVN r24216]
2004-08-01 05:40:21 +00:00
7819b022ad License update
[SVN r24180]
2004-07-30 04:46:56 +00:00
65d27e7f86 License update
[SVN r24175]
2004-07-30 01:47:08 +00:00
212a70bf77 Remove "and" from copyright
[SVN r24167]
2004-07-29 15:50:36 +00:00
6b5dc18a46 Converted to Boost Software License, Version 1.0
[SVN r24096]
2004-07-27 03:43:34 +00:00
0917f83b9c Converted to Boost Software License, Version 1.0
[SVN r24055]
2004-07-26 00:32:12 +00:00
7322bd3903 License update
[SVN r24048]
2004-07-25 19:13:06 +00:00
e998010184 Add license
[SVN r24021]
2004-07-25 03:57:20 +00:00
918a1c93e4 Doug Gregor -> Douglas Gregor
[SVN r24016]
2004-07-25 02:29:29 +00:00
14c87853c2 Needed to include cstddef to get std::size_t
[SVN r24000]
2004-07-23 18:42:30 +00:00
d5a5b84a40 Switch the test to use std::stringstream, not std::ostrstream, since
the latter is deprecated and gcc warns whenever one tries to use it.


[SVN r23896]
2004-07-21 12:28:18 +00:00
35d3c03d19 Update
[SVN r23085]
2004-06-11 11:18:50 +00:00
8933fbb254 The binary_search_test does not require Boost.Test all all, and does not
provide 'test_main' or 'unit_test_main', so don't link to Boost.Test.


[SVN r23073]
2004-06-10 11:49:39 +00:00
c320330cd5 fixed a typo
[SVN r22754]
2004-05-06 22:38:34 +00:00
822b46a3df Complain when compiler can't support result_of
[SVN r22749]
2004-05-06 17:29:54 +00:00
a821ef6e2c Added enable_if.hpp as an include
[SVN r22735]
2004-05-04 16:07:00 +00:00
491db15997 boost/utility/result_of.hpp, boost/utility/detail/result_of_iterate.hpp:
- result_of implementation

libs/utility/test/result_of_test.cpp:
  - result_of tests

libs/utility/test/Jamfile, libs/utility/test/Jamfile.v2:
  - run result_of tests

libs/utility/utility.htm:
  - document result_of

libs/libraries.htm:
  - list result_of

index.htm:
  - announce result_of


[SVN r22720]
2004-05-02 19:55:02 +00:00
b6c826a139 shared_container_iterator library:
- updated Copyright and License notices
 - Added shared_iterator_test to the iterator test suite.


[SVN r22140]
2004-02-02 22:16:36 +00:00
7b472a05ee Obsoleted old iterator adaptor docs
[SVN r22101]
2004-02-01 04:30:15 +00:00
9a07bc0d9b Added missing include <cstddef>
[SVN r21993]
2004-01-27 11:24:25 +00:00
154d6bb198 When we have a compressed pair of two types that are the same, and both empty, then we must still have two distict objects in the pair.
[SVN r21958]
2004-01-26 11:29:07 +00:00
0dde936e61 DM fixes
[SVN r21933]
2004-01-26 00:19:59 +00:00
918bf25039 Fixed documentation for less_pointees
[SVN r21737]
2004-01-14 20:22:00 +00:00
04fda4fb4e Use proper syntax to refer to Boost.Test.
[SVN r21566]
2004-01-09 13:03:16 +00:00
e14a250d6e pro9 workarounds; some ADL protection for is_xxx
[SVN r21529]
2004-01-07 14:07:21 +00:00
806745f24e Fix tabs in file.
[SVN r21399]
2003-12-26 23:26:49 +00:00
4231f774e4 fix next_prior_test.cpp directory
[SVN r21384]
2003-12-23 19:14:37 +00:00
dfc320124f Extended next/prior using patch from Daniel Walker (Daniel.Walker-at-bowneglobal.com)
[SVN r21382]
2003-12-23 14:59:59 +00:00
be43ba1569 Improved workarounds.
[SVN r21157]
2003-12-06 03:57:54 +00:00
f3f879555a Fixed result_type
[SVN r21155]
2003-12-05 22:03:33 +00:00
3155044abd added dummy versions of enable_if templates for platforms that
have BOOST_NO_SFINAE defined


[SVN r21154]
2003-12-05 21:38:43 +00:00
484d184de5 guarded enable_if definitions with BOOST_NO_SFINAE
[SVN r21149]
2003-12-05 16:31:38 +00:00
3305cf1592 Fixed a bug in the semantics of less_pointees() {again}
[SVN r21133]
2003-12-04 01:53:29 +00:00
ec36cd8c54 Fixed a bug in the semantics of less_pointees()
[SVN r21132]
2003-12-04 01:47:31 +00:00
61fb5a0b8f fix broken link to logo
[SVN r21122]
2003-12-03 14:36:38 +00:00
8024c3e9c7 Updated license terms
[SVN r21120]
2003-12-03 13:34:11 +00:00
2f5945d0cd Removed bool_testable, added note about portability of separate, explicit instantiation, changed license of documentation
[SVN r21110]
2003-12-03 07:01:28 +00:00
929517d6d7 Added enable_if library
[SVN r21090]
2003-12-02 21:41:15 +00:00
abcab174a5 _MSC_VER use clarified.
[SVN r20992]
2003-11-28 15:35:21 +00:00
801be90699 Moved from "utility" to "detail" until a Fast Track Review formalizes it.
[SVN r20983]
2003-11-28 14:36:21 +00:00
265c2348b8 Removed access category tags from iterator library, made corresponding
changes elsewhere.

boost/iterator and libs/iterator/test were updated from
branch "simplify"


[SVN r20905]
2003-11-22 01:18:37 +00:00
fb95bcc64c Moved some of my stuff to the Boost Software License, Version 1.0
[SVN r20681]
2003-11-05 07:04:53 +00:00
aedc410525 New License
[SVN r20607]
2003-11-03 02:59:08 +00:00
7fa440c154 *** empty log message ***
[SVN r20511]
2003-10-28 00:09:18 +00:00
746e0fad2b Changed email address to john@johnmaddock.co.uk
[SVN r20472]
2003-10-24 11:13:42 +00:00
1616f6f5a8 Update credits for R. Samuel Klatchko
[SVN r20325]
2003-10-09 14:16:15 +00:00
ca3e7d8530 Add V2 Jamfile
[SVN r20270]
2003-10-07 07:25:24 +00:00
f0f753ba6c Typed in place construction added
[SVN r20070]
2003-09-15 20:28:10 +00:00
532065b51b Change license message to reference Boost Software License
[SVN r20038]
2003-09-12 17:09:29 +00:00
4bfb534bae Added for new Boost.Optional functionality
[SVN r19995]
2003-09-10 15:40:47 +00:00
95ba7a4381 Use the import rule
[SVN r19968]
2003-09-08 17:38:49 +00:00
e92213431e Removed tie_example.cpp per Daniel's request
[SVN r19910]
2003-09-03 05:24:48 +00:00
7dd7daee1b Removed obsolete references to utility/tie
[SVN r19902]
2003-09-01 21:04:26 +00:00
953cc46220 Removed code-breaking change from boost/detail/iterator.hpp and
corresponding workarounds from tests.

Added permutation_iterator_test to the suite after fixing it up -- it
was riddled with bugs!


[SVN r19841]
2003-08-28 20:18:51 +00:00
b5ae0ad86b Moved to much cleaner system of using BOOST_TT_BROKEN_COMPILER_SPEC
for handling vc6/7 deficiencies with iterator_traits.

Fixed a bug in iterator_facade which was causing incomplete types to
be passed through is_convertible.

Reinstated libs/utility/iterator_traits_test.cpp


[SVN r19840]
2003-08-28 16:52:02 +00:00
c86fcbf456 Fix for Metrowerks CW
[SVN r19626]
2003-08-16 01:05:43 +00:00
6ded8b9ad6 Initial revision.
[SVN r19536]
2003-08-11 19:24:03 +00:00
bb6a6272e1 Updated shared_container_iterator to use the new iterator adaptors library.
Updated the documentation and examples as well to reflect the changes.


[SVN r19535]
2003-08-11 16:29:47 +00:00
242634b3fc Added safe_bool_testable_test
[SVN r19373]
2003-07-30 21:33:37 +00:00
662cf14bf6 Initial version
[SVN r19372]
2003-07-30 21:32:19 +00:00
fe3aaf62cd Undo overeager workarounding and safe_bool.
[SVN r19364]
2003-07-30 12:41:10 +00:00
cb189bd6be operators.hpp, operators_test.cpp - workaround for compilers not
supporting the PP lib, many workarounds for another problem which
   may be our bug.

linear_congruential.hpp - Borland workaround


[SVN r19350]
2003-07-30 01:11:14 +00:00
f57c914b8f Preparation for delivering nicely-formatted error messages in
Boost.Python.  The major change is that, instead of being
boost::function2<PyObject*,PyObject*,PyObject*>, py_function is now a
runtime-polymorphic wrapper for compile-time polymorphic
behavior (just like function) of our own which carries more
information/behaviors.  In particular, you can retrieve an array of
c-strings describing the types in the function signature.
Additionally, the minimum and maximum arity are stored in the
py_function object instead of in the 'function' object which wraps it.

* data_members.hpp -

     Adjustments for the new py_function.  Workarounds for CodeWarrior
     Pro 8.3 bugs in function template argument deduction with
     pointers-to-members.

* has_back_reference.hpp, test/back_reference.cpp,
  test/select_holder.cpp -

     Updated to follow the metafunction protocol

* init.hpp, detail/defaults_gen.hpp -

     Make Keywords a more-specific type in function signatures to
     prevent string literals that show up as char[N] from binding to
     the wrong argument (at least Intel 7.1 for Windows does this).

* make_function.hpp -

     Adjustments for the new py_function.  Arities are now computed
     by caller<>.

* opaque_pointer_converter.hpp, type_id.hpp -

     Use BOOST_NO_EXPLICIT_FUNCTION_TEMPLATE_ARGUMENTS facilities;
     generate specializations that all compilers can handle.

* raw_function.hpp -

     Adjustments for the new py_function.

* caller.hpp -

     Added arity and signature type name reporting.

* detail/config.hpp

     Enable __declspec(dllexport) for Cygwin, thereby fixing the
     recent horrible Cygwin linking problems.


* detail/msvc_typeinfo.hpp -

     Always pass boost::type<T>* explicitly, thereby working around
     incompatible notions of how to specialize function templates with
     default arguments on various compilers.

*   object/function.hpp
  , object/function_handle.hpp
  , object/function_object.hpp
  , object/function_object.cpp

     Adjustments for the new py_function.  Arities are carried by
     py_function.

* object/iterator.hpp, object/iterator.cpp

     Adjustments for the new py_function; we have to compute a
     signature of types to construct it with.

* object/py_function.hpp

     Removed dependency on boost::function; see the comment at the
     top of this entry for more details.

* object/select_holder.hpp

     Clean up to more closely follow MPL idioms.

* test/Jamfile -

     Adjust the embedding test for the new Cygwin use of declspec.
     Update bases and pointee tests with missing properties.

* test/input_iterator.cpp -

     Updates for the new iterator adaptors.

* test/opaque.py -

     Add Python encoding comment to suppress PendinDeprecationWarning
     with recent Python builds.

* test/str.cpp

     Pass a Python long instead of a float to string.expandtabs,
     suppressing a PendinDeprecationWarning with recent Python builds.

* libs/utility/counting_iterator_example.cpp

     Borland workaround

* libs/utility/indirect_iterator_example.cpp

     const-correctness fix.

*


[SVN r19247]
2003-07-22 00:06:41 +00:00
7cec198e14 Added missing algorithm include.
[SVN r19230]
2003-07-20 19:17:18 +00:00
52d3120528 Borland workaround
[SVN r19157]
2003-07-16 19:10:34 +00:00
f1aff5670c strict 2-phase ADL fixes.
[SVN r19152]
2003-07-16 15:16:21 +00:00
632f682292 Satisfy assignable requirement for output iterators.
[SVN r19150]
2003-07-16 14:30:47 +00:00
d1d0d6b788 Fixed Intel 7 issue (reported by Daniel Frey)
[SVN r19145]
2003-07-16 10:53:06 +00:00
3bd833c8ff avoid default parameters for function templates, they confuse SunCC
[SVN r19100]
2003-07-13 18:59:08 +00:00
1ef77b0853 fix cut-and-paste problem with subproject path
[SVN r19084]
2003-07-12 09:37:36 +00:00
074007ab8c Get examples working, mostly. Some interface expansion for a few of
the adaptors, allowing default construction of UnaryFunction and
Predicate arguments when they are class types.


[SVN r19081]
2003-07-12 04:15:13 +00:00
c4b7aaf281 Move to new iterator adaptors
[SVN r19074]
2003-07-11 22:18:58 +00:00
22b8494e9a Factored out separate utility/test Jamfile
[SVN r19068]
2003-07-11 17:24:18 +00:00
c1c8329403 Expanded base-from-member constructors to 10 arguments; did minor tweaks
[SVN r18791]
2003-06-15 01:16:49 +00:00
20a89040e1 -Wundef fixes.
[SVN r18788]
2003-06-12 17:09:24 +00:00
1c7a2a1476 IBM C++ support added.
[SVN r18587]
2003-05-28 13:45:58 +00:00
7c40cc0b63 Fixed bool_testable for compilers with BOOST_NO_OPERATORS_IN_NAMESPACE
[SVN r18521]
2003-05-23 23:09:21 +00:00
73a9e0d351 Intel support.
[SVN r18520]
2003-05-23 22:30:23 +00:00
dc9856744a Fixed tests for bool_testable
[SVN r18502]
2003-05-23 00:18:57 +00:00
88f4e47550 Added bool_testable by Sam Partington
[SVN r18413]
2003-05-15 22:40:33 +00:00
1be04eeec5 Fix a bug in preprocessor usage
[SVN r18231]
2003-04-11 06:56:52 +00:00
56acf9c325 Fixed shift-operators to respect BOOST_FORCE_SYMMETRIC_OPERATORS
[SVN r17664]
2003-02-26 21:26:57 +00:00
c6e3957efc MPL names/directory structure refactoring
[SVN r17651]
2003-02-25 23:11:41 +00:00
25e8284950 Qualified checked_delete calls to prevent ADL (reported by Daniel Frey)
[SVN r17636]
2003-02-25 13:00:22 +00:00
37a6537a5b fix metafunctions for MPL
[SVN r17621]
2003-02-25 00:57:33 +00:00
80df1d8f12 split utility.hpp header
[SVN r17472]
2003-02-17 06:20:57 +00:00
75afed7f17 Made operator()s const.
[SVN r17411]
2003-02-14 16:20:01 +00:00
1d7066aee1 __func__ is a predefined identifier, not a macro.
[SVN r17308]
2003-02-10 16:25:41 +00:00
12272a38d4 Initial Commit (was left out when the Optional Library was commited)
[SVN r17204]
2003-02-04 15:29:12 +00:00
04f901e52e fixed some typos
[SVN r17052]
2003-01-27 19:14:18 +00:00
fabfb31bf6 add value_init
[SVN r16826]
2003-01-09 13:26:13 +00:00
683701cd07 fix invalid bookmarks
[SVN r16823]
2003-01-09 13:03:37 +00:00
119c64be0b Workaround VC7 bug which strips const from nested classes
[SVN r16797]
2003-01-08 17:21:10 +00:00
d429c9a7d8 minor cleanup
[SVN r16709]
2002-12-27 16:58:27 +00:00
1e8216431b add or update See www.boost.org comments
[SVN r16708]
2002-12-27 16:51:53 +00:00
e45b2e2136 Doc link updated.
[SVN r16699]
2002-12-24 12:34:42 +00:00
9e6951009b Add /libs/lib-name to comment
[SVN r16685]
2002-12-23 02:43:12 +00:00
a009a209f1 Use BOOST_WORKAROUND
[SVN r16668]
2002-12-20 00:03:04 +00:00
97605056ed Added a note that throw_exception must not return (Beman Dawes)
[SVN r16471]
2002-12-02 12:12:42 +00:00
8fcfa33d33 Fix: Comeau with bcc32 as backend defines __BORLANDC__ as 1.
[SVN r16455]
2002-11-28 13:32:44 +00:00
aa65e3da3b sort_by_value(std::list<std::string>& l) is not declared inline anymore to make it compile with vacpp
[SVN r16407]
2002-11-25 15:54:37 +00:00
b4cfadb4d5 Metrowerks support (Bertolt Mildner)
[SVN r16263]
2002-11-15 19:44:18 +00:00
45a6249668 New BOOST_ASSERT, including documentation.
[SVN r16240]
2002-11-14 16:09:29 +00:00
1d601aef4d boost::throw_exception documentation added.
[SVN r16239]
2002-11-14 15:13:59 +00:00
32fb45eba9 checked_delete.hpp documentation added.
[SVN r16238]
2002-11-14 14:53:32 +00:00
2b7d10aceb BOOST_CURRENT_FUNCTION documentation added.
[SVN r16236]
2002-11-14 14:41:25 +00:00
5dc62711e1 Fix from Yitzhak Sapir <yitzhaks@actimize.com>
[SVN r16198]
2002-11-11 19:50:05 +00:00
252c02aca0 Works with MSVC and Intel5 now. Thanks, Aleksey!!
[SVN r16165]
2002-11-08 17:08:17 +00:00
9655beb7ba Cleanups on boost::iterator_traits<>
Broke MSVC though :(


[SVN r16157]
2002-11-08 06:57:31 +00:00
f0ea53e77e rip out illegal semicolons
[SVN r16134]
2002-11-06 18:20:38 +00:00
4755b42909 Daniel Frey's NRVO patches
[SVN r16084]
2002-11-04 01:59:32 +00:00
ef9af03c6c Changed typename to class; some libraries helpfully #define typename
[SVN r15970]
2002-10-23 13:55:18 +00:00
7439073cbf Merged from branch to trunk
[SVN r15572]
2002-09-30 16:54:26 +00:00
aff985a563 explicit "private" inheritance to avoid compiler warnings (MIPSpro)
[SVN r15422]
2002-09-17 21:06:32 +00:00
db425222d5 mpl_v2 branch checkin
[SVN r15258]
2002-09-11 05:35:41 +00:00
e20af510f7 Initial Revision
[SVN r15254]
2002-09-10 16:13:08 +00:00
d8230c6a73 Added Shared Container Iterator adaptor to iterator adaptor library.
[SVN r15169]
2002-09-05 14:05:29 +00:00
f5690787bf Distinguish between VC++ versions
[SVN r15127]
2002-09-01 14:57:40 +00:00
a4fd7b32dd Misc Kylix fixes
[SVN r15086]
2002-08-25 11:57:37 +00:00
f4336ec693 fixed typo.
[SVN r14798]
2002-08-12 20:47:54 +00:00
03d906976b Reduced probes from 10,000 to 1,000 to speed regression tests
[SVN r14789]
2002-08-12 15:05:23 +00:00
4ba6a96822 fix test_main signature
[SVN r14783]
2002-08-12 13:22:40 +00:00
1ea4140d56 Added tests for BOOST_NO_STD_ITERATOR_TRAITS
[SVN r14654]
2002-07-31 11:25:25 +00:00
351d4ecb15 Document policies() member of iterator_adaptor
[SVN r14613]
2002-07-26 00:03:24 +00:00
7fbf84dcc6 BaseType -> Base in one more place
[SVN r14605]
2002-07-25 19:10:05 +00:00
3ff49b272d fixup
[SVN r14598]
2002-07-25 14:16:54 +00:00
5b52e3d418 Fix doc based on Beman's feedback
[SVN r14596]
2002-07-25 13:52:48 +00:00
8c0eb498d3 Fix unversioned VC++ checks
[SVN r14436]
2002-07-13 12:26:19 +00:00
48a81ef7ea VC++ fixes
[SVN r14435]
2002-07-13 12:22:51 +00:00
f7610c9b26 fix link
[SVN r14318]
2002-07-05 23:51:20 +00:00
1755eaf019 Merged from RC_1_28_0
[SVN r13944]
2002-05-16 00:56:42 +00:00
6b8b218efb Removed tabs, fixed end of files.
[SVN r13803]
2002-05-10 11:35:38 +00:00
333d79b345 Add index.html so automatic tools work correctly
[SVN r13725]
2002-05-07 19:23:05 +00:00
f0fa436fe4 Added new config macro BOOST_HAS_MS_INT64 to detect presence of __int64 data type.
Modified boost source to use BOOST_HAS_LONG_LONG and BOOST_HAS_MS_INT64
   where appropriate to do so.


[SVN r13714]
2002-05-07 11:24:29 +00:00
13e6d78fa8 Fixes for Borland C++ Builder 6
[SVN r13662]
2002-05-04 11:03:42 +00:00
7126ea2685 Borland C++ Builder 6 fixes
[SVN r13659]
2002-05-04 10:55:15 +00:00
a37518cb4a Fixed broken links.
[SVN r13574]
2002-04-27 11:05:49 +00:00
64b3e8c3bd add missing #include <iterator>
[SVN r13554]
2002-04-23 19:52:11 +00:00
339937380e MSVC fixes.
[SVN r13476]
2002-04-13 13:19:57 +00:00
6156f0d302 Roll addressof() patch back in!
[SVN r13433]
2002-04-10 17:01:35 +00:00
00560e8e17 addressof.hpp:
- Peter Dimov suggested a fix to deal with those evil cv-qualifiers


[SVN r13431]
2002-04-10 14:47:32 +00:00
029ff9828f Roll back addressof() patch temporarily
[SVN r13428]
2002-04-10 09:48:30 +00:00
ec188c7c3e Make local classes nonlocal to silence annoying warnings from Borland C++
[SVN r13418]
2002-04-10 04:00:22 +00:00
0a0296a5d0 ref.hpp:
- Use addressof() instead of & operator


[SVN r13416]
2002-04-10 03:36:17 +00:00
6e26a5bbe7 boost/utility.hpp:
- Include boost/utility/addressof.hpp

boost/utility/addressof.hpp:
  - addressof() implementation

libs/utility/utility.htm:
  - Document addressof

libs/utility/addressof_test.cpp:
  - Test addressof()


[SVN r13414]
2002-04-10 03:31:18 +00:00
dc1b6246a0 boost/ref.hpp:
- Added get_pointer method to return a pointer (instead of a reference)

libs/bind/ref.html:
  - Document get_pointer


[SVN r13322]
2002-03-31 00:24:00 +00:00
15f69eaf14 Fixed new problem with Borland compile -
code clashes with some new type traits workarounds for some reason.


[SVN r13226]
2002-03-19 11:33:00 +00:00
4774a0d325 Added Copyright
[SVN r13145]
2002-03-09 20:34:06 +00:00
be78ab72c9 update expected failures for Sun CC
[SVN r13101]
2002-03-05 20:41:37 +00:00
0bc4a1b20d Warning suppressioni from Craig Rodrigues
[SVN r13098]
2002-03-05 18:55:49 +00:00
c8b674d105 Add missing paren.
[SVN r12997]
2002-03-01 17:43:00 +00:00
b421d4725a Fixed expected failures for gcc 3.1
[SVN r12994]
2002-03-01 12:27:01 +00:00
1662bb5713 use of "small" changed to "small_" to suppress confusion on some compilers
[SVN r12916]
2002-02-24 02:35:19 +00:00
ad79a21abd added portability note about using std::vector's as Base with VC++
[SVN r12875]
2002-02-21 12:09:46 +00:00
19645a52e6 Added a default constructor to shared_count and shared_ptr for incomplete types (void).
[SVN r12815]
2002-02-15 13:31:58 +00:00
74c3077c9a Added test cases for incomplete and abstract base class types.
[SVN r12803]
2002-02-14 12:57:32 +00:00
1f29191329 Modified call_traits to work with incomplete types.
[SVN r12800]
2002-02-14 12:54:57 +00:00
4b636a7680 Always say "private noncopyable" to avoid warnings.
[SVN r12762]
2002-02-08 20:08:15 +00:00
e6fc2555f3 removed tabs
[SVN r12707]
2002-02-04 20:29:35 +00:00
e27d0fcf2a New smart pointer documentation. Related clean-up of the smart pointer
library. Changing includes to include the new individual smart pointer
headers. Replacing old smart pointer library with an include of the new
smart pointer headers. Simplify ifdefs that involve the member templates
macros now that BOOST_MSVC6_MEMBER_TEMPLATES is also guaranteed to bet
set for platforms that have full member templates.


[SVN r12647]
2002-02-02 18:36:12 +00:00
2643c33b20 Doc fixes from Thomas Witt
[SVN r12621]
2002-02-01 13:03:21 +00:00
71af1e77c8 compile-time ref.hpp header test, initial checkin
[SVN r12525]
2002-01-27 13:39:06 +00:00
99e7406bd9 ref_ct_test.cpp
[SVN r12524]
2002-01-27 13:32:37 +00:00
413265f497 compile-time ref.hpp header test, initial checkin
[SVN r12522]
2002-01-27 13:07:20 +00:00
fe44cdf09b made 'reference_wrapper' Assignable
[SVN r12520]
2002-01-27 13:02:27 +00:00
e413428d71 Added tests for the new smart pointers.
[SVN r12500]
2002-01-25 13:54:30 +00:00
88b9822db7 Mark inline to avoid warning with "require prototypes" on.
[SVN r12490]
2002-01-24 19:15:30 +00:00
24045c0cd7 #included <boost/checked_delete.hpp>, removed unnecessary #includes.
[SVN r12488]
2002-01-24 17:47:08 +00:00
d2aa9f4a84 added missing #include of boost/config.hpp
[SVN r12483]
2002-01-24 16:55:41 +00:00
d2a5fd169f initial checkin
[SVN r12481]
2002-01-24 16:52:06 +00:00
4e350d9934 Modified is_reference_wrapper<> to work for reference types.
[SVN r12475]
2002-01-24 13:28:08 +00:00
f3f697bbc8 added is_reference_wrapper<>, unwrap_reference<>
[SVN r12470]
2002-01-23 21:19:14 +00:00
c7c09696db Tweak comments. Include <assert.h> and <boost/current_function.hpp> only
when needed.


[SVN r12446]
2002-01-22 18:28:33 +00:00
dbcc58d984 Smart pointer enhancements, initial commit
[SVN r12439]
2002-01-22 13:38:52 +00:00
8231310c4d initial checkin
[SVN r12390]
2002-01-21 01:29:06 +00:00
2988140430 tabs
[SVN r12360]
2002-01-19 16:07:28 +00:00
7387966005 Stripped tabs from source
[SVN r12351]
2002-01-19 12:38:14 +00:00
e0a5a61375 removed eroneous "detail::" prefix
[SVN r12326]
2002-01-15 19:14:53 +00:00
66ecd70689 removed std:: prefix from slist
[SVN r12310]
2002-01-14 14:57:20 +00:00
67f4f45653 Fixed violation of 'explicit' constructor
[SVN r12256]
2002-01-09 13:15:54 +00:00
1bf28b3de2 Fixes for Borland
[SVN r12254]
2002-01-09 12:11:37 +00:00
eb3c3435d7 Updated expected results
[SVN r12250]
2002-01-08 13:01:15 +00:00
8a81d8b16c Workarounds for MSVC
[SVN r12246]
2002-01-07 19:24:45 +00:00
bc9d8b13d0 converted some of the old terminology (OrderIterator) to the current
terminology (IndexIterator)


[SVN r12164]
2001-12-28 15:49:45 +00:00
4768b167ab Removed obsolete mentions of "less"; Added formalized Policies Concept description
[SVN r12056]
2001-12-14 12:54:21 +00:00
591ff70ed1 many fixes
[SVN r12054]
2001-12-13 19:43:35 +00:00
7bf2ad0b22 VC6 patch
[SVN r12045]
2001-12-13 18:24:29 +00:00
409c79b2e4 fix example (thanks to Michael Stevens)
[SVN r11979]
2001-12-08 08:39:27 +00:00
d0410691a1 removed calls to non-standard std::iota (SGI extension)
[SVN r11904]
2001-12-04 08:02:36 +00:00
64e5115138 Fixed spelling error ing gcc-3.0 bug workaround
[SVN r11888]
2001-12-03 21:48:54 +00:00
7ae912d83c Rolled in Helmut's fixes for random_access_iterable; rolled back
workarounds for that problem.


[SVN r11887]
2001-12-03 21:47:58 +00:00
2937f5876c changed std::iota call (SGI extension) to a manual loop
in permutation_iterator test


[SVN r11869]
2001-12-03 08:35:08 +00:00
8619c9b5c3 fix gcc looping (from Dave Abrahams)
[SVN r11839]
2001-11-30 17:55:39 +00:00
e4d5684f6b added test for permutation_iterator
[SVN r11825]
2001-11-30 11:10:07 +00:00
3d69cf95da added documentation for the permutation_iterator_adaptor
and linked to it from the iterator_adaptors documentation.


[SVN r11824]
2001-11-30 10:40:03 +00:00
18944572b7 committing Daryle and Helmut's changes
[SVN r11813]
2001-11-29 21:22:52 +00:00
3e9d0f80c2 add generator iterator adaptor
[SVN r11736]
2001-11-19 22:11:51 +00:00
a2c4d1990a add boost::generator_iterator_policies and convenience classes
[SVN r11725]
2001-11-18 17:56:43 +00:00
404261c6ee add definition for integral constants initialized in-class
[SVN r11723]
2001-11-18 17:32:19 +00:00
87abc59612 #undef BOOST_REF_CONST added
[SVN r11674]
2001-11-14 14:40:29 +00:00
cb98ddf7db Fixed a bug w/ adaptable function objects + nested binds, made ref<> return const
[SVN r11670]
2001-11-13 13:56:05 +00:00
7d2e6c9025 __stdcall support added.
[SVN r11649]
2001-11-10 19:18:58 +00:00
75eaa14a18 Removed defunct boost::tied (thanks, Daryle Walker)
[SVN r11622]
2001-11-07 10:35:12 +00:00
082d6e3b32 *** empty log message ***
[SVN r11614]
2001-11-06 16:09:14 +00:00
35b3770b6f *** empty log message ***
[SVN r11613]
2001-11-06 16:05:25 +00:00
5b9d20c7e2 *** empty log message ***
[SVN r11611]
2001-11-06 15:52:56 +00:00
5bbed2372e *** empty log message ***
[SVN r11602]
2001-11-05 21:03:59 +00:00
a9d407d239 update SunCC to 6.u2 (C++ 5.3)
[SVN r11601]
2001-11-05 21:00:53 +00:00
3ca4a33a65 updated for named parameters
[SVN r11566]
2001-11-04 16:21:51 +00:00
95197f427c remoeved #if 0
[SVN r11565]
2001-11-04 16:18:10 +00:00
84cdfb032c commit these changes
[SVN r11563]
2001-11-04 04:37:14 +00:00
ec2ceb9c96 no message
[SVN r11508]
2001-11-01 17:22:39 +00:00
6286c893fd Minor regression fixes for Borland and Sunpro tests.
[SVN r11470]
2001-10-30 11:41:35 +00:00
354aef0e8c changed named parameters doc to match new stuff
[SVN r11417]
2001-10-22 17:04:23 +00:00
139e33c36d Updated preprocessor logic to use BOOST_HAS_LONG_LONG
[SVN r11399]
2001-10-18 11:33:52 +00:00
e01de59cdd Made these actually compile
[SVN r11378]
2001-10-12 22:22:42 +00:00
686f822dea Fix spelling error: "occurances" -> "occurrences".
[SVN r11376]
2001-10-11 17:26:04 +00:00
9961d5c9af Last fix had broken preprocessor logic, now fixed.
[SVN r11373]
2001-10-11 12:04:00 +00:00
628be0d125 Fixes for Sunpro C++ 5.3 (code now works!)
[SVN r11368]
2001-10-09 11:24:56 +00:00
633e45f61a Fixed test to work with sunpro 5.3 (omits array specialisation tests)
[SVN r11359]
2001-10-08 11:35:05 +00:00
2f357c3805 Partial fixes for sunpro 5.3 - doesn't actually work yet though
[SVN r11355]
2001-10-08 11:31:29 +00:00
cda0894d0d Fix for sunpro 5.3 (array specialisations don't work)
[SVN r11354]
2001-10-08 11:30:53 +00:00
117720a8bc 1.25.0 Final runup
[SVN r11315]
2001-10-01 15:54:23 +00:00
a6f6c3613a Change comments to make it clear why forward declaration header is required.
[SVN r11314]
2001-10-01 14:15:44 +00:00
7914f5b931 Fixed unused variables that show up as warnings when doing regression
tests.


[SVN r11241]
2001-09-24 23:21:16 +00:00
a1add0a6f6 Intel C++ fixes: Added class copy constructor.
[SVN r11200]
2001-09-22 11:52:56 +00:00
c032b337c4 Fix broken links and other HTML changes related to new config system
[SVN r11142]
2001-09-18 21:24:51 +00:00
ec363261ae remove "explicit" on two- and three-argument constructors to avoid
error on HP aCC


[SVN r11097]
2001-09-11 18:42:25 +00:00
97cde2183d Initial base_from_member commit
[SVN r11086]
2001-09-10 14:04:28 +00:00
7f43c682db Fixed the pair_generator documentation. Order of parameters was wrong; reordered
the table to match the corrected order.


[SVN r11035]
2001-09-05 16:29:29 +00:00
0c9eee3c6b changed note about the move to the tuples library
[SVN r10972]
2001-08-30 19:45:19 +00:00
3b1afa3ba6 changed "empty-member" to "empty base-class"
[SVN r10966]
2001-08-30 10:58:19 +00:00
93e6a75125 changed #include for tie() to tuple.hpp
[SVN r10951]
2001-08-28 19:09:33 +00:00
52f8a7c0ca changed #include for tie()
[SVN r10950]
2001-08-28 19:07:51 +00:00
55bfeb646f removed tie() and class tied
[SVN r10938]
2001-08-26 19:55:49 +00:00
75c9dd3be1 added not about constness of operator* and operator[]
[SVN r10931]
2001-08-24 15:28:20 +00:00
6392e2788f Removed incorrect statics, added const
[SVN r10930]
2001-08-24 12:09:34 +00:00
6a97f3f9ba Tabs converted to spaces.
[SVN r10916]
2001-08-23 19:05:21 +00:00
6e5f52e279 initial commit
[SVN r10914]
2001-08-23 18:42:16 +00:00
7f92bed902 Fix some broken links. Fix order of constructor initializers.
[SVN r10913]
2001-08-23 17:42:07 +00:00
d68a11cc42 Misc; mostly fix links to hard disk locations
[SVN r10902]
2001-08-20 13:04:43 +00:00
328a81e194 Fix broken hyperlink
[SVN r10896]
2001-08-19 15:08:33 +00:00
31d0908b74 Add workaround for BOOST_NO_STDC_NAMESPACE
[SVN r10681]
2001-07-20 21:29:36 +00:00
32c77599f4 Fixes for ICL
[SVN r10613]
2001-07-14 12:51:59 +00:00
812ebf3562 Back out commit made in error
[SVN r10596]
2001-07-12 16:15:30 +00:00
37f476013d Change absolute URL's to relative
[SVN r10594]
2001-07-12 15:31:15 +00:00
9f3104166f output_iterator_helper changes: removed default template parameters, added
support for self-proxying, additional documentation and tests (Aleksey Gurtovoy)


[SVN r10576]
2001-07-09 23:51:49 +00:00
64cc0daf34 Integrate Aleksey's changes
[SVN r10575]
2001-07-09 23:50:55 +00:00
d5d64df124 Fix broken link
[SVN r10553]
2001-07-06 19:19:45 +00:00
0edcfcd5c1 Tuples library causes tie to be deprecated
[SVN r10552]
2001-07-06 19:16:39 +00:00
50ba2d419a Tweeked gcc workaround (gcc 3 still has same problem as gcc 2.9x), added tentative Metrowerks and Intel compiler workarounds.
[SVN r10422]
2001-06-25 11:31:14 +00:00
ff3a77ca5a Fixed problem with VC6 compilers - probably a temporary fix.
[SVN r10361]
2001-06-20 11:43:57 +00:00
4eaed6c23d remove superfluous, illegal "typename" (twice)
[SVN r10314]
2001-06-12 18:50:37 +00:00
4d0dd46471 meant to add as a branch
[SVN r10280]
2001-06-06 19:16:34 +00:00
9c2549bd00 files for the tmpw2001 paper about iterator adaptors
[SVN r10278]
2001-06-06 19:08:51 +00:00
b7c8e0c17f changes from Daryle Walker
[SVN r10264]
2001-06-04 11:57:37 +00:00
dd3cfe1837 removed old arg ordering, use defaults instead
[SVN r10258]
2001-06-03 20:00:24 +00:00
43f525298e Remove compiler workarounds no longer needed due to BOOST_STATIC_ASSERT fix. For stylistic reasons, change sizeof() test to sizeof() != 0
[SVN r10236]
2001-05-28 14:22:30 +00:00
1bb1898ab9 Dave says qualifiers weren't really needed
[SVN r10222]
2001-05-24 19:11:51 +00:00
9578f24be9 Workaround compiler problems while waiting to find out if BOOST_STATIC_ASSERT is broken
[SVN r10218]
2001-05-24 16:02:42 +00:00
46fae3aed2 added check_delete workaround for Sun CC
[SVN r10213]
2001-05-24 09:26:48 +00:00
e35f91a70a Smart pointer and utility changes related to adding checked_delere and checked_array_delete
[SVN r10189]
2001-05-22 18:58:21 +00:00
851052fcca Updated docs - added VC6 bug warning
[SVN r10062]
2001-05-08 11:17:44 +00:00
5ef81b2952 Updated/stricter test program
[SVN r10061]
2001-05-08 11:17:05 +00:00
ef2851c053 Fixes for Sun C++ 5.1
[SVN r10060]
2001-05-08 11:16:35 +00:00
0b4387cff5 reorganised tests to show up VC6 bugs
[SVN r10002]
2001-05-02 10:59:32 +00:00
a40cf11fbf Rewritten compressed_pair regression script to test everything in a more methodical way
[SVN r10000]
2001-05-01 11:17:02 +00:00
5c495cd223 Change all eGroups references to YahooGroups
[SVN r9979]
2001-04-25 00:24:50 +00:00
cf1296dff8 added stuff about Default Constructible needed for the function object
[SVN r9683]
2001-03-29 16:26:42 +00:00
d6d88db6e8 std::bind1st -> boost::bind1st
[SVN r9682]
2001-03-29 16:19:34 +00:00
85c2a35257 std::binder1st -> boost::binder1st
[SVN r9681]
2001-03-29 16:18:41 +00:00
836d8b1c64 added spaces in name
[SVN r9673]
2001-03-29 04:08:38 +00:00
98d8c8ab71 fixed broken link
[SVN r9645]
2001-03-27 10:54:12 +00:00
db45013339 fixed sgi stl link
[SVN r9631]
2001-03-22 16:06:15 +00:00
a55c37e7f6 fixed sgi stl links
[SVN r9630]
2001-03-22 16:05:48 +00:00
46a270fcca fixed link to sgi stl
[SVN r9629]
2001-03-22 16:02:11 +00:00
967856518e updated link to sgi stl
[SVN r9628]
2001-03-22 16:01:18 +00:00
7f93e739fe added documentation for initialize() policy function
[SVN r9592]
2001-03-19 21:46:14 +00:00
2cd1422514 added comment about abstract base classes as value_type
[SVN r9584]
2001-03-19 17:31:27 +00:00
feb370b201 1.21.0 run up including fixing broken links
[SVN r9523]
2001-03-09 14:36:41 +00:00
d1b34e64d8 Fixes for validator.w3.org
[SVN r9518]
2001-03-09 03:28:13 +00:00
b9a1eead40 Mostly clarification. Fix: changed "category" to "iterator_category" in one place.
[SVN r9517]
2001-03-09 03:10:32 +00:00
1e4bfac98c added named template parameter to table of contents
[SVN r9510]
2001-03-08 21:36:09 +00:00
3bb504fbf3 added revision history line
[SVN r9506]
2001-03-08 20:50:14 +00:00
5029791c90 split off indirect and transform tests into separate files
[SVN r9505]
2001-03-08 20:49:05 +00:00
a1a68f0970 1.21.0 run up
[SVN r9502]
2001-03-08 20:35:52 +00:00
f8543d79eb added more static asserts
[SVN r9500]
2001-03-08 20:02:00 +00:00
f353415136 added docs for iterator_traits_generator
[SVN r9498]
2001-03-08 19:19:46 +00:00
26240403b0 added a test to make sure that the type set by the generator is really the
type used


[SVN r9497]
2001-03-08 19:04:29 +00:00
3a39729b58 new file
[SVN r9488]
2001-03-08 16:33:40 +00:00
096c961d9a Patches for Intel C++
[SVN r9425]
2001-03-04 16:08:20 +00:00
01fe04a6a2 Workaround for Borland
[SVN r9424]
2001-03-04 16:07:11 +00:00
7ea4014993 Misc fixes that missed the last commit..
[SVN r9402]
2001-03-04 11:08:29 +00:00
d50b374f88 Boost Test Library initial commit
[SVN r9364]
2001-02-28 21:39:56 +00:00
27dfb25570 added function output iterator adaptor
[SVN r9351]
2001-02-27 05:50:51 +00:00
b5ed77985e added missing typename's to docs
[SVN r9324]
2001-02-25 12:04:48 +00:00
61243bd15f type_traits: more tentative EDG compiler fixes...
[SVN r9321]
2001-02-24 13:04:56 +00:00
368b94d804 Corrected numeric_limits<>::is_integral -> numeric_limits<>::is_integer
[SVN r9299]
2001-02-20 23:15:29 +00:00
a5adbbfd5f use filter_iter::policies_type instead of filter_gen::policies_type
[SVN r9292]
2001-02-20 16:01:00 +00:00
a19d13f123 More type_traits tweeks.
[SVN r9287]
2001-02-20 12:17:55 +00:00
78886ab383 Added cross-reference; improved policies documentation
[SVN r9286]
2001-02-20 03:49:26 +00:00
168012b465 Describe const/mutable interactions and give rationale for no
reverse_iterator_pair_generator.


[SVN r9285]
2001-02-20 03:04:03 +00:00
d9d58ea66e Take advantage of improved iterator_traits to do more tests on MSVC. Reordered
some #ifdefs for coherency.


[SVN r9281]
2001-02-19 22:36:22 +00:00
56f5f6e8d5 Take adavantage of improved iterator_traits to do more tests on MSVC. Hack
around an MSVC-with-STLport internal compiler error.


[SVN r9280]
2001-02-19 22:34:31 +00:00
3cb6420eda Roll back the reverse_iterator_pair_generator test
[SVN r9278]
2001-02-19 20:37:24 +00:00
60be2c1186 Added tests for reverse_iterator_pair_generator
[SVN r9273]
2001-02-19 16:21:12 +00:00
ed210f6b2c more type traits updates:
Header includes get BOOST_ prefix,
BOOST_DECL_MC dropped in favour of new BOOST_STATIC_CONSTANT (from config.hpp),
operator ! dropped in favour of boost::type_traits::ice_not template.


[SVN r9270]
2001-02-19 12:52:30 +00:00
029bc59d74 Added some missing 'explicit's
[SVN r9265]
2001-02-18 22:23:13 +00:00
961c08a82f Apply Jens' suggested fixes
[SVN r9263]
2001-02-18 21:50:57 +00:00
7ee484c614 fix minor typos
[SVN r9259]
2001-02-18 19:26:20 +00:00
05c6fbbf99 needs <boost/type_traits/same_traits.hpp>
[SVN r9253]
2001-02-18 15:19:23 +00:00
91078b7f7a type_traits: regression failure fixes from type traits changes...
[SVN r9249]
2001-02-18 11:43:01 +00:00
20d804afc4 changes to order of indirect_iterator template parameter list, and
fixed a typo


[SVN r9247]
2001-02-17 22:03:30 +00:00
c21f6d1cbf added Category parameter and made a few more edits with regards to type requirements
[SVN r9239]
2001-02-17 19:59:19 +00:00
393e79c1fd Added new type traits files.
[SVN r9238]
2001-02-17 12:25:45 +00:00
8b92c8a085 adjusted requirements for value type of the base iterator
[SVN r9236]
2001-02-17 01:51:45 +00:00
ff73dd94c9 made iterator_adaptor constructor explicit
[SVN r9235]
2001-02-17 01:50:40 +00:00
af43904f38 added "explicit" to iterator_adaptor constructor
[SVN r9234]
2001-02-17 01:44:41 +00:00
485074f265 Added a missing const. Made the tests run (somewhat) with plain MSVC again.
[SVN r9232]
2001-02-16 23:04:49 +00:00
2e0ee55b5e add missing my_int3::operator!=
[SVN r9231]
2001-02-16 21:28:59 +00:00
e9105d32cb background color and a whitespace edit
[SVN r9228]
2001-02-16 16:38:45 +00:00
964d23f68c Edits for clarity
[SVN r9224]
2001-02-16 05:51:37 +00:00
be5aaaae7b More edits for clarity. Added const/non-const example.
[SVN r9223]
2001-02-16 05:33:21 +00:00
bf13bd7b3f Massive edits
[SVN r9222]
2001-02-16 05:30:49 +00:00
352e392fcb Checked and cleaned using HTML TIDY.
[SVN r9220]
2001-02-16 02:36:36 +00:00
083b1b02df Bigtime edits
[SVN r9219]
2001-02-16 00:38:28 +00:00
648c6240a2 added another link to the generic_programming.html#policies
[SVN r9218]
2001-02-15 16:57:12 +00:00
60cab840cb removed strange ssh garbage
[SVN r9217]
2001-02-15 16:52:39 +00:00
83a4380dab added mention of traits requirement under Type Requirements section
[SVN r9216]
2001-02-15 16:49:16 +00:00
de84fe8d98 oops, meant to remove use of policies_type from filter_iterator_generator
in the last commit, but accidentally added it :(


[SVN r9215]
2001-02-15 16:43:54 +00:00
ed3cbfdb8e removed policies_type from filter_iterator_generator
[SVN r9214]
2001-02-15 16:41:48 +00:00
fda44ca17d General edits for clarity; some reorganization.
[SVN r9213]
2001-02-15 16:39:55 +00:00
272025bb07 fixed my_int::operator--
[SVN r9208]
2001-02-15 06:47:06 +00:00
8e92bcf1b2 removed policies_type from filter_iterator_generator
[SVN r9207]
2001-02-15 06:44:26 +00:00
84f1ffdefe added section on Members to cover constructors, etc. and added
a section on Operators


[SVN r9206]
2001-02-15 06:41:46 +00:00
7e25450054 added discusion of counting_iterator_traits, and added type requirements
for the Incrementable type.

added uses of user-defined types to the test


[SVN r9204]
2001-02-15 05:53:10 +00:00
4a563fa266 added missing boost::
[SVN r9199]
2001-02-14 20:35:39 +00:00
aa4c0ec000 Test new VC6 workarounds
[SVN r9198]
2001-02-13 23:32:19 +00:00
e1ecfbdc43 added output for the transform iterator example
[SVN r9187]
2001-02-13 04:38:59 +00:00
a4e122a82e changed template class to class template
[SVN r9186]
2001-02-13 04:34:44 +00:00
93216e8fb7 copyright
[SVN r9184]
2001-02-13 04:25:24 +00:00
16272c210d fixed typo
[SVN r9183]
2001-02-13 04:24:24 +00:00
e104b00da1 merged in Dave's additions and added a tutorial using the implementation
of transform iterator as the example


[SVN r9182]
2001-02-13 04:15:17 +00:00
ce5c6bcc08 removed use of istream_iterator for operator-> test, replaced with
use of concept archetypes


[SVN r9180]
2001-02-13 02:03:13 +00:00
8694ce31fe changed int* to std::vector<int>::iterator
[SVN r9178]
2001-02-12 21:59:25 +00:00
d960e5eadd added another example
[SVN r9177]
2001-02-12 21:57:19 +00:00
2dc71e87a3 new files
[SVN r9176]
2001-02-12 21:35:20 +00:00
6bf17edde2 updated url to the iterator_adaptor class
[SVN r9156]
2001-02-12 05:24:45 +00:00
88573d515d fixed Reference and Pointer template paremeter descriptions
[SVN r9155]
2001-02-12 05:20:09 +00:00
89b9f77823 obsolete and not needed
[SVN r9152]
2001-02-12 04:55:19 +00:00
765d9be17d small edit
[SVN r9151]
2001-02-12 04:53:39 +00:00
7135373008 various edits
[SVN r9150]
2001-02-12 04:52:24 +00:00
ee269884fc finished 1st draft of reverse iterator docs
[SVN r9149]
2001-02-12 04:51:56 +00:00
387540d5f1 using make_const_projection_iterator() for last example,
and a couple other minor edits


[SVN r9145]
2001-02-12 02:55:19 +00:00
2eba7b42a8 new files
[SVN r9144]
2001-02-12 02:52:26 +00:00
07115d26c7 finished 1st draft
[SVN r9143]
2001-02-12 01:50:50 +00:00
c43ed815a0 new files
[SVN r9137]
2001-02-11 20:05:00 +00:00
ff01e36d12 Compile with Borland, re-enable failing tests
[SVN r9136]
2001-02-11 19:53:56 +00:00
ac4798b16c Final fixes for Borland
[SVN r9135]
2001-02-11 19:50:14 +00:00
d4e14fed0e Fixed bugs in the iterator helpers which prevented explicitly supplied arguments from actually being used
[SVN r9128]
2001-02-11 19:31:21 +00:00
5f91259344 few edits
[SVN r9125]
2001-02-11 19:26:26 +00:00
20a9d9645d Added test of operator-> for forward and input iterators.
[SVN r9124]
2001-02-11 19:25:49 +00:00
c86f6b4abd Dave's suggested edits
[SVN r9122]
2001-02-11 18:27:40 +00:00
d66489b5b2 changed per Dave's comments
[SVN r9121]
2001-02-11 18:14:04 +00:00
b743ee9f0c #if 0'd out use of counting_iterator on non-numeric types in MSVC without STLport, so that the other tests may proceed
[SVN r9120]
2001-02-11 16:19:17 +00:00
95ba69c00a Borland fixes
[SVN r9119]
2001-02-11 16:16:53 +00:00
2ac273739c Update for compatibility with new iterator_adaptor interface
[SVN r9118]
2001-02-11 16:14:14 +00:00
5b4d28708c Fixes for Borland
[SVN r9117]
2001-02-11 16:13:38 +00:00
4cc4383488 Some fixes for Borland get it closer on that compiler
[SVN r9112]
2001-02-11 16:05:01 +00:00
8935232248 new files
[SVN r9109]
2001-02-11 05:25:19 +00:00
5c6dd2f172 various edits
[SVN r9108]
2001-02-11 04:34:32 +00:00
eeeb7ef5b9 Replaced some static_casts with explicit construction
[SVN r9107]
2001-02-11 03:12:04 +00:00
2efc9c1178 Use new adaptors interface
[SVN r9105]
2001-02-11 03:07:55 +00:00
a84c46f6e3 added another example
[SVN r9103]
2001-02-11 03:01:47 +00:00
a5c3dcdd02 redid docs for the template parameters
[SVN r9102]
2001-02-11 02:55:38 +00:00
46f7a75eb7 fixed bug in policy object constructor
[SVN r9101]
2001-02-11 02:40:02 +00:00
94b6710c5b fixed bug in policy object construction
[SVN r9100]
2001-02-11 02:39:35 +00:00
d8dd3da9ab small edit
[SVN r9099]
2001-02-11 02:38:08 +00:00
803ced004a finished 1st draft
[SVN r9098]
2001-02-11 02:35:09 +00:00
0ea7d36ad0 A fix for EDG
[SVN r9096]
2001-02-10 23:16:05 +00:00
87aafab759 new file
[SVN r9094]
2001-02-10 22:33:43 +00:00
994d310abd Use new filter_ interface.
[SVN r9090]
2001-02-10 20:11:42 +00:00
228cdcf05e All final 1.20.2 changes, including fixing broken hyperlinks
[SVN r9071]
2001-02-10 14:42:14 +00:00
42598e352c Use new reverse_ and indirect_ interfaces. Replace BOOST_NO_STD_ITERATOR_TRAITS
with BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION to prove we've normalized to core
compiler capabilities


[SVN r9067]
2001-02-10 00:38:08 +00:00
36a9e4d1da fixed usage of indirect_iterator_pair_generator
[SVN r9053]
2001-02-09 05:45:10 +00:00
456dfd0dea adjusted to changes in iterator_adaptors.hpp, added more
tests of make_xxx


[SVN r9051]
2001-02-09 05:26:48 +00:00
155457e2b5 more work on default args and explicit templat args
[SVN r9049]
2001-02-09 04:40:42 +00:00
b5c91485bf Use Jeremy's new make_reverse_iterator form; add more comprehensive
testing. Force-decay array function arguments to pointers.


[SVN r9047]
2001-02-09 03:32:59 +00:00
c959cf7870 bug fixes
[SVN r9031]
2001-02-08 04:46:41 +00:00
5878c88636 added indirect_iterator_pair_generator back in
[SVN r9026]
2001-02-08 03:35:03 +00:00
ddcef2fb19 Added tests for the make_xxx_iterator() helper functions
[SVN r9025]
2001-02-08 03:08:09 +00:00
493d124c07 rename counting_iterator() -> make_counting_iterator()
[SVN r9015]
2001-02-07 22:27:02 +00:00
f42060c616 add missing "typename"
[SVN r9005]
2001-02-07 17:51:55 +00:00
834facc932 trivial flotsam cleanup
[SVN r9004]
2001-02-07 17:23:52 +00:00
f82d0b76ee More comprehensive testing; factored out static tests for better reuse
[SVN r9001]
2001-02-07 16:38:41 +00:00
c25d225275 Replaced use of xxx_pair_generator with xxx_generator where
possible (which was all but the projection iterator).


[SVN r8996]
2001-02-07 06:36:12 +00:00
c503a274b5 Removed now-defaulted template arguments where possible
Updated names to correspond to new generator naming convention.
Added a trivial test for make_transform_iterator().
Gave traits for const iterators a mutable value_type, per std.
Resurrected my original tests for indirect iterators.


[SVN r8995]
2001-02-07 05:37:08 +00:00
087069d215 added concept check for the default iterator policy
[SVN r8990]
2001-02-07 02:44:18 +00:00
826a6dd114 changed test for transform iterator to use input_iterator instead of
random access iterator


[SVN r8937]
2001-02-04 23:46:31 +00:00
f31483838d Fix for compilers without standard iterator_traits
[SVN r8929]
2001-02-04 20:11:30 +00:00
d8a9b633d9 Fix for newly-corrected bidirectional_iterator_test requirements.
[SVN r8926]
2001-02-04 19:09:46 +00:00
c060e4466a Added use of iterator_tests.hpp
[SVN r8923]
2001-02-04 18:26:43 +00:00
a9951376f4 removed UDT -> int is_convertible test because the noncopyable -> int
test already brings out the g++ warning


[SVN r8834]
2001-01-31 19:08:27 +00:00
bda0c8f5e3 added some more tests and fixed signature of main() so this will link
with MSVC


[SVN r8833]
2001-01-31 18:54:29 +00:00
71902f23a2 Added test case for is_convertible with UDT that brings out the
warning message bug with g++.


[SVN r8821]
2001-01-31 02:12:08 +00:00
dfd6c85569 Inital checkin
[SVN r8813]
2001-01-30 16:00:37 +00:00
0e41b2cc1a Removed not_an_iterator detritus
[SVN r8808]
2001-01-29 02:14:44 +00:00
e5c81d0702 fixed very strange VC++ bug that was showing up in graph/test/graph.cpp
Something about the code gen for compressed_pair_1::operator=
was going wrong. Writing it explicitly, and playing with some ordering
fixed the problem, don't ask my why.


[SVN r8765]
2001-01-25 04:45:52 +00:00
6caf7d4d5a Initial checkin
[SVN r8757]
2001-01-24 18:36:52 +00:00
98e87c8afb Added test for wchar_t
[SVN r8748]
2001-01-24 01:48:01 +00:00
d9e0f80d50 Now statically selecting a test for signed numbers to avoid warnings with fancy
compilers. Added commentary and additional dumping of traits data for tested
types.


[SVN r8746]
2001-01-24 01:40:22 +00:00
6396fdb5ff added filter iterator test
[SVN r8736]
2001-01-23 19:10:03 +00:00
2470b53373 minor fix: move "static" storage specifier to the front of a declaration
[SVN r8714]
2001-01-22 21:11:35 +00:00
16334e92ca added KAI C++ type for std::list::difference_type
[SVN r8709]
2001-01-22 16:52:36 +00:00
c22d98a8ec Quick fix to my_iterator, which wasn't returning a reference type from operator*
[SVN r8705]
2001-01-22 05:03:48 +00:00
28617afbb9 Initial checkin
[SVN r8702]
2001-01-22 04:08:29 +00:00
0c3bc42bec new files
[SVN r8685]
2001-01-21 20:12:32 +00:00
e3d9745df1 Initial Checkin
[SVN r8676]
2001-01-21 06:02:08 +00:00
b8471c1015 Suppress an expected warning for MSVC
Added a test to prove that we can use void with is_same<>
      Removed "press any key to exit" as it interferes with testing in large
      batches.


[SVN r8673]
2001-01-21 05:56:57 +00:00
045b09c9ef A first attempt at clarifying the documentation
[SVN r8672]
2001-01-21 05:48:55 +00:00
4ac07b97d3 Fixed what seemed like glaring bugs (illegal access to private members, missing template parameters).
[SVN r8658]
2001-01-20 21:59:55 +00:00
34c847c17f moved global variables in front of reference in test_align
[SVN r8648]
2001-01-19 19:27:09 +00:00
f694e557e1 compressed pair fixes for VC6
[SVN r8543]
2001-01-10 12:21:30 +00:00
6a0c3e92a0 Initial commit after public review (note change in library name per review)
[SVN r8516]
2001-01-06 16:47:36 +00:00
cba48df8e3 VC6 fixes for compressed_pair
[SVN r8485]
2000-12-21 12:27:22 +00:00
a0e8d1bf36 a C++ standard version of LessThanComparable
[SVN r8435]
2000-12-09 22:39:50 +00:00
912dedaca7 added #include boost/config.hpp at top to remove truncation warning on VC++
[SVN r8434]
2000-12-09 20:28:48 +00:00
7dd90c3919 CVS says it needs a commit; who knows why?
[SVN r8405]
2000-12-08 17:35:43 +00:00
7c3a25a377 various changes, almost forgot to check in
[SVN r8379]
2000-12-03 06:20:23 +00:00
c8fbca2d44 added docs for projection iterator
[SVN r8322]
2000-11-24 21:31:43 +00:00
f7ed0aaeed added std:: to unary_function
[SVN r8321]
2000-11-24 20:48:02 +00:00
6e78270140 added projection iterator to the test
[SVN r8320]
2000-11-24 20:45:26 +00:00
ba354377d5 updated docs for indirect iterators
[SVN r8319]
2000-11-24 20:22:23 +00:00
353c030918 simplified version of iterator_adaptor, plus fix to indirect iterator
and addition of projection iterator


[SVN r8317]
2000-11-24 19:40:51 +00:00
331a2b8282 Fixed regex memory leak, and type_traits bad test case
[SVN r8273]
2000-11-21 12:39:09 +00:00
4bd6909ea1 *** empty log message ***
[SVN r8158]
2000-11-07 23:05:04 +00:00
26119613e1 BeOS5 (intel) fixes
[SVN r8133]
2000-11-04 11:16:12 +00:00
45bfe0b607 HTML change for 1.18.2 reflecting separation of old utility library
[SVN r8118]
2000-11-03 19:22:26 +00:00
ce2f573ab2 new file, based on the C++ standard, not SGI STL's definition of Assignable
[SVN r8062]
2000-10-29 21:35:59 +00:00
66d5cc43f3 added BeOS5 support to test script (not finished yet though...)
[SVN r8037]
2000-10-28 10:54:12 +00:00
e8265e09a3 Add trivial numeric_cast tests for floating types.
[SVN r8007]
2000-10-19 19:12:53 +00:00
860cf0b321 Fix broken HTML links
[SVN r7951]
2000-10-15 17:08:00 +00:00
89c74708d7 misc minor fixes
[SVN r7938]
2000-10-14 12:03:10 +00:00
74c8680350 Add missing "typename" that Metrowerks compiler is picky about
[SVN r7929]
2000-10-12 21:01:49 +00:00
3cd9f5b623 MWCW fix: added std:: qualifier to memset
[SVN r7923]
2000-10-10 11:40:19 +00:00
0936110741 minor typo fixes
[SVN r7922]
2000-10-10 10:40:58 +00:00
6161ce15c7 more VC6 type-traits and compressed pair fixes
[SVN r7921]
2000-10-07 10:53:47 +00:00
28594a22f1 More VC6 fixes for is_pointer/is_array/is_same
[SVN r7896]
2000-10-03 11:53:39 +00:00
656517b059 More VC6 fixes for compressed_pair and type_traits.
[SVN r7895]
2000-10-03 11:47:24 +00:00
ad576863b4 fix typo: compressed_pait->compressed_pair
[SVN r7894]
2000-10-03 08:06:19 +00:00
775be75366 updated call_traits and type_traits test programs for VC6
[SVN r7883]
2000-10-01 11:57:00 +00:00
7ae6e5bac9 call_traits and type_traits updates for VC6
[SVN r7882]
2000-10-01 11:48:27 +00:00
96 changed files with 13407 additions and 5348 deletions

109
Assignable.html Normal file
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Language" content="en-us">
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<title>Assignable</title>
</head>
<body bgcolor="#FFFFFF" link="#0000EE" text="#000000" vlink="#551A8B" alink=
"#FF0000">
<img src="../../boost.png" alt="C++ Boost" width="277" height=
"86"><br clear="none">
<h1>Assignable</h1>
<h3>Description</h3>
<p>A type is Assignable if it is possible to assign one object of the type
to another object of that type.</p>
<h3>Notation</h3>
<table summary="">
<tr>
<td valign="top"><tt>T</tt></td>
<td valign="top">is type that is a model of Assignable</td>
</tr>
<tr>
<td valign="top"><tt>t</tt></td>
<td valign="top">is an object of type <tt>T</tt></td>
</tr>
<tr>
<td valign="top"><tt>u</tt></td>
<td valign="top">is an object of type <tt>T</tt> or possibly <tt>const
T</tt></td>
</tr>
</table>
<h3>Definitions</h3>
<h3>Valid expressions</h3>
<table border summary="">
<tr>
<th>Name</th>
<th>Expression</th>
<th>Return type</th>
<th>Semantics</th>
</tr>
<tr>
<td valign="top">Assignment</td>
<td valign="top"><tt>t = u</tt></td>
<td valign="top"><tt>T&amp;</tt></td>
<td valign="top"><tt>t</tt> is equivalent to <tt>u</tt></td>
</tr>
</table>
<h3>Models</h3>
<ul>
<li><tt>int</tt></li>
<li><tt>std::pair</tt></li>
</ul>
<h3>See also</h3>
<p><a href=
"http://www.sgi.com/tech/stl/DefaultConstructible.html">DefaultConstructible</a>
and <a href="./CopyConstructible.html">CopyConstructible</a><br></p>
<hr>
<p><a href="http://validator.w3.org/check?uri=referer"><img border="0" src=
"http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01 Transitional"
height="31" width="88"></a></p>
<p>Revised
<!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %B, %Y" startspan -->05 December, 2006<!--webbot bot="Timestamp" endspan i-checksum="38516" --></p>
<table summary="">
<tr valign="top">
<td nowrap><i>Copyright &copy; 2000</i></td>
<td><i><a href="http://www.lsc.nd.edu/~jsiek">Jeremy Siek</a>, Univ.of
Notre Dame (<a href=
"mailto:jsiek@lsc.nd.edu">jsiek@lsc.nd.edu</a>)</i></td>
</tr>
</table>
<p><i>Distributed under the Boost Software License, Version 1.0. (See
accompanying file <a href="../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or
copy at <a href=
"http://www.boost.org/LICENSE_1_0.txt">http://www.boost.org/LICENSE_1_0.txt</a>)</i></p>
</body>
</html>

534
Collection.html Normal file
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Language" content="en-us">
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<title>Collection</title>
</head>
<body bgcolor="#FFFFFF" link="#0000EE" text="#000000" vlink="#551A8B" alink=
"#FF0000">
<h1><img src="../../boost.png" alt="boost logo" width="277" align="middle"
height="86"><br>
Collection</h1>
<h3>Description</h3>
<p>A Collection is a <i>concept</i> similar to the STL <a href=
"http://www.sgi.com/tech/stl/Container.html">Container</a> concept. A
Collection provides iterators for accessing a range of elements and
provides information about the number of elements in the Collection.
However, a Collection has fewer requirements than a Container. The
motivation for the Collection concept is that there are many useful
Container-like types that do not meet the full requirements of Container,
and many algorithms that can be written with this reduced set of
requirements. To summarize the reduction in requirements:</p>
<ul>
<li>It is not required to "own" its elements: the lifetime of an element
in a Collection does not have to match the lifetime of the Collection
object, though the lifetime of the element should cover the lifetime of
the Collection object.</li>
<li>The semantics of copying a Collection object is not defined (it could
be a deep or shallow copy or not even support copying).</li>
<li>The associated reference type of a Collection does not have to be a
real C++ reference.</li>
</ul>Because of the reduced requirements, some care must be taken when
writing code that is meant to be generic for all Collection types. In
particular, a Collection object should be passed by-reference since
assumptions can not be made about the behaviour of the copy constructor.
<h3>Associated types</h3>
<table border summary="">
<tr>
<td valign="top">Value type</td>
<td valign="top"><tt>X::value_type</tt></td>
<td valign="top">The type of the object stored in a Collection. If the
Collection is <i>mutable</i> then the value type must be <a href=
"http://www.sgi.com/tech/stl/Assignable.html">Assignable</a>. Otherwise
the value type must be <a href=
"./CopyConstructible.html">CopyConstructible</a>.</td>
</tr>
<tr>
<td valign="top">Iterator type</td>
<td valign="top"><tt>X::iterator</tt></td>
<td valign="top">The type of iterator used to iterate through a
Collection's elements. The iterator's value type is expected to be the
Collection's value type. A conversion from the iterator type to the
const iterator type must exist. The iterator type must be an <a href=
"http://www.sgi.com/tech/stl/InputIterator.html">InputIterator</a>.</td>
</tr>
<tr>
<td valign="top">Const iterator type</td>
<td valign="top"><tt>X::const_iterator</tt></td>
<td valign="top">A type of iterator that may be used to examine, but
not to modify, a Collection's elements.</td>
</tr>
<tr>
<td valign="top">Reference type</td>
<td valign="top"><tt>X::reference</tt></td>
<td valign="top">A type that behaves like a reference to the
Collection's value type. <a href="#n1">[1]</a></td>
</tr>
<tr>
<td valign="top">Const reference type</td>
<td valign="top"><tt>X::const_reference</tt></td>
<td valign="top">A type that behaves like a const reference to the
Collection's value type.</td>
</tr>
<tr>
<td valign="top">Pointer type</td>
<td valign="top"><tt>X::pointer</tt></td>
<td valign="top">A type that behaves as a pointer to the Collection's
value type.</td>
</tr>
<tr>
<td valign="top">Distance type</td>
<td valign="top"><tt>X::difference_type</tt></td>
<td valign="top">A signed integral type used to represent the distance
between two of the Collection's iterators. This type must be the same
as the iterator's distance type.</td>
</tr>
<tr>
<td valign="top">Size type</td>
<td valign="top"><tt>X::size_type</tt></td>
<td valign="top">An unsigned integral type that can represent any
nonnegative value of the Collection's distance type.</td>
</tr>
</table>
<h3>Notation</h3>
<table summary="">
<tr>
<td valign="top"><tt>X</tt></td>
<td valign="top">A type that is a model of Collection.</td>
</tr>
<tr>
<td valign="top"><tt>a</tt>, <tt>b</tt></td>
<td valign="top">Object of type <tt>X</tt>.</td>
</tr>
<tr>
<td valign="top"><tt>T</tt></td>
<td valign="top">The value type of <tt>X</tt>.</td>
</tr>
</table>
<h3>Valid expressions</h3>
<p>The following expressions must be valid.</p>
<table border summary="">
<tr>
<th>Name</th>
<th>Expression</th>
<th>Return type</th>
</tr>
<tr>
<td valign="top">Beginning of range</td>
<td valign="top"><tt>a.begin()</tt></td>
<td valign="top"><tt>iterator</tt> if <tt>a</tt> is mutable,
<tt>const_iterator</tt> otherwise</td>
</tr>
<tr>
<td valign="top">End of range</td>
<td valign="top"><tt>a.end()</tt></td>
<td valign="top"><tt>iterator</tt> if <tt>a</tt> is mutable,
<tt>const_iterator</tt> otherwise</td>
</tr>
<tr>
<td valign="top">Size</td>
<td valign="top"><tt>a.size()</tt></td>
<td valign="top"><tt>size_type</tt></td>
</tr><!--
<TR>
<TD VAlign=top>
Maximum size
</TD>
<TD VAlign=top>
<tt>a.max_size()</tt>
</TD>
<TD VAlign=top>
<tt>size_type</tt>
</TD>
</TR>
-->
<tr>
<td valign="top">Empty Collection</td>
<td valign="top"><tt>a.empty()</tt></td>
<td valign="top">Convertible to <tt>bool</tt></td>
</tr>
<tr>
<td valign="top">Swap</td>
<td valign="top"><tt>a.swap(b)</tt></td>
<td valign="top"><tt>void</tt></td>
</tr>
</table>
<h3>Expression semantics</h3>
<table border summary="">
<tr>
<th>Name</th>
<th>Expression</th>
<th>Semantics</th>
<th>Postcondition</th>
</tr>
<tr>
<td valign="top">Beginning of range</td>
<td valign="top"><tt>a.begin()</tt></td>
<td valign="top">Returns an iterator pointing to the first element in
the Collection.</td>
<td valign="top"><tt>a.begin()</tt> is either dereferenceable or
past-the-end. It is past-the-end if and only if <tt>a.size() ==
0</tt>.</td>
</tr>
<tr>
<td valign="top">End of range</td>
<td valign="top"><tt>a.end()</tt></td>
<td valign="top">Returns an iterator pointing one past the last element
in the Collection.</td>
<td valign="top"><tt>a.end()</tt> is past-the-end.</td>
</tr>
<tr>
<td valign="top">Size</td>
<td valign="top"><tt>a.size()</tt></td>
<td valign="top">Returns the size of the Collection, that is, its
number of elements.</td>
<td valign="top"><tt>a.size() &gt;= 0</tt></td>
</tr><!--
<TR>
<TD VAlign=top>
Maximum size
</TD>
<TD VAlign=top>
<tt>a.max_size()</tt>
</TD>
<TD VAlign=top>
&nbsp;
</TD>
<TD VAlign=top>
Returns the largest size that this Collection can ever have. <A href="#8">[8]</A>
</TD>
<TD VAlign=top>
<tt>a.max_size() &gt;= 0 &amp;&amp; a.max_size() &gt;= a.size()</tt>
</TD>
</TR>
-->
<tr>
<td valign="top">Empty Collection</td>
<td valign="top"><tt>a.empty()</tt></td>
<td valign="top">Equivalent to <tt>a.size() == 0</tt>. (But possibly
faster.)</td>
<td valign="top">&nbsp;</td>
</tr>
<tr>
<td valign="top">Swap</td>
<td valign="top"><tt>a.swap(b)</tt></td>
<td valign="top">Equivalent to <tt>swap(a,b)</tt></td>
<td valign="top">&nbsp;</td>
</tr>
</table>
<h3>Complexity guarantees</h3>
<p><tt>begin()</tt> and <tt>end()</tt> are amortized constant time.</p>
<p><tt>size()</tt> is at most linear in the Collection's size.
<tt>empty()</tt> is amortized constant time.</p>
<p><tt>swap()</tt> is at most linear in the size of the two
collections.</p>
<h3>Invariants</h3>
<table border summary="">
<tr>
<td valign="top">Valid range</td>
<td valign="top">For any Collection <tt>a</tt>, <tt>[a.begin(),
a.end())</tt> is a valid range.</td>
</tr>
<tr>
<td valign="top">Range size</td>
<td valign="top"><tt>a.size()</tt> is equal to the distance from
<tt>a.begin()</tt> to <tt>a.end()</tt>.</td>
</tr>
<tr>
<td valign="top">Completeness</td>
<td valign="top">An algorithm that iterates through the range
<tt>[a.begin(), a.end())</tt> will pass through every element of
<tt>a</tt>.</td>
</tr>
</table>
<h3>Models</h3>
<ul>
<li><tt>array</tt></li>
<li><tt>array_ptr</tt></li>
<li><tt>vector&lt;bool&gt;</tt></li>
</ul>
<h3>Collection Refinements</h3>
<p>There are quite a few concepts that refine the Collection concept,
similar to the concepts that refine the Container concept. Here is a brief
overview of the refining concepts.</p>
<h4>ForwardCollection</h4>
<p>The elements are arranged in some order that does not change
spontaneously from one iteration to the next. As a result, a
ForwardCollection is <a href=
"http://www.sgi.com/tech/stl/EqualityComparable.html">EqualityComparable</a>
and <a href=
"http://www.sgi.com/tech/stl/LessThanComparable.html">LessThanComparable</a>.
In addition, the iterator type of a ForwardCollection is a
MultiPassInputIterator which is just an InputIterator with the added
requirements that the iterator can be used to make multiple passes through
a range, and that if <tt>it1 == it2</tt> and <tt>it1</tt> is
dereferenceable then <tt>++it1 == ++it2</tt>. The ForwardCollection also
has a <tt>front()</tt> method.</p>
<table border summary="">
<tr>
<th>Name</th>
<th>Expression</th>
<th>Return type</th>
<th>Semantics</th>
</tr>
<tr>
<td valign="top">Front</td>
<td valign="top"><tt>a.front()</tt></td>
<td valign="top"><tt>reference</tt> if <tt>a</tt> is mutable,<br>
<tt>const_reference</tt> otherwise.</td>
<td valign="top">Equivalent to <tt>*(a.begin())</tt>.</td>
</tr>
</table>
<h4>ReversibleCollection</h4>
<p>The container provides access to iterators that traverse in both
directions (forward and reverse). The iterator type must meet all of the
requirements of <a href=
"http://www.sgi.com/tech/stl/BidirectionalIterator.html">BidirectionalIterator</a>
except that the reference type does not have to be a real C++ reference.
The ReversibleCollection adds the following requirements to those of
ForwardCollection.</p>
<table border summary="">
<tr>
<th>Name</th>
<th>Expression</th>
<th>Return type</th>
<th>Semantics</th>
</tr>
<tr>
<td valign="top">Beginning of range</td>
<td valign="top"><tt>a.rbegin()</tt></td>
<td valign="top"><tt>reverse_iterator</tt> if <tt>a</tt> is mutable,
<tt>const_reverse_iterator</tt> otherwise.</td>
<td valign="top">Equivalent to
<tt>X::reverse_iterator(a.end())</tt>.</td>
</tr>
<tr>
<td valign="top">End of range</td>
<td valign="top"><tt>a.rend()</tt></td>
<td valign="top"><tt>reverse_iterator</tt> if <tt>a</tt> is mutable,
<tt>const_reverse_iterator</tt> otherwise.</td>
<td valign="top">Equivalent to
<tt>X::reverse_iterator(a.begin())</tt>.</td>
</tr>
<tr>
<td valign="top">Back</td>
<td valign="top"><tt>a.back()</tt></td>
<td valign="top"><tt>reference</tt> if <tt>a</tt> is mutable,<br>
<tt>const_reference</tt> otherwise.</td>
<td valign="top">Equivalent to <tt>*(--a.end())</tt>.</td>
</tr>
</table>
<h4>SequentialCollection</h4>
<p>The elements are arranged in a strict linear order. No extra methods are
required.</p>
<h4>RandomAccessCollection</h4>
<p>The iterators of a RandomAccessCollection satisfy all of the
requirements of <a href=
"http://www.sgi.com/tech/stl/RandomAccessIterator.html">RandomAccessIterator</a>
except that the reference type does not have to be a real C++ reference. In
addition, a RandomAccessCollection provides an element access operator.</p>
<table border summary="">
<tr>
<th>Name</th>
<th>Expression</th>
<th>Return type</th>
<th>Semantics</th>
</tr>
<tr>
<td valign="top">Element Access</td>
<td valign="top"><tt>a[n]</tt></td>
<td valign="top"><tt>reference</tt> if <tt>a</tt> is mutable,
<tt>const_reference</tt> otherwise.</td>
<td valign="top">Returns the nth element of the Collection. <tt>n</tt>
must be convertible to <tt>size_type</tt>. Precondition: <tt>0 &lt;= n
&lt; a.size()</tt>.</td>
</tr>
</table>
<h3>Notes</h3>
<p><a name="n1" id="n1">[1]</a> The reference type does not have to be a
real C++ reference. The requirements of the reference type depend on the
context within which the Collection is being used. Specifically it depends
on the requirements the context places on the value type of the Collection.
The reference type of the Collection must meet the same requirements as the
value type. In addition, the reference objects must be equivalent to the
value type objects in the collection (which is trivially true if they are
the same object). Also, in a mutable Collection, an assignment to the
reference object must result in an assignment to the object in the
Collection (again, which is trivially true if they are the same object, but
non-trivial if the reference type is a proxy class).</p>
<h3>See also</h3>
<p><a href=
"http://www.sgi.com/tech/stl/Container.html">Container</a><br></p>
<hr>
<p><a href="http://validator.w3.org/check?uri=referer"><img border="0" src=
"http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01 Transitional"
height="31" width="88"></a></p>
<p>Revised
<!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %B, %Y" startspan -->05
December, 2006<!--webbot bot="Timestamp" endspan i-checksum="38516" --></p>
<table summary="">
<tr valign="top">
<td nowrap><i>Copyright &copy; 2000</i></td>
<td><i><a href="http://www.boost.org/people/jeremy_siek.htm">Jeremy
Siek</a>, Univ.of Notre Dame and C++ Library &amp; Compiler Group/SGI
(<a href="mailto:jsiek@engr.sgi.com">jsiek@engr.sgi.com</a>)</i></td>
</tr>
</table>
<p><i>Distributed under the Boost Software License, Version 1.0. (See
accompanying file <a href="../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or
copy at <a href=
"http://www.boost.org/LICENSE_1_0.txt">http://www.boost.org/LICENSE_1_0.txt</a>)</i></p>
</body>
</html>

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@ -1,188 +1,185 @@
<HTML>
<!--
-- Copyright (c) Jeremy Siek 2000
--
-- Permission to use, copy, modify, distribute and sell this software
-- and its documentation for any purpose is hereby granted without fee,
-- provided that the above copyright notice appears in all copies and
-- that both that copyright notice and this permission notice appear
-- in supporting documentation. Silicon Graphics makes no
-- representations about the suitability of this software for any
-- purpose. It is provided "as is" without express or implied warranty.
-->
<Head>
<Title>CopyConstructible</Title>
</HEAD>
<BODY BGCOLOR="#ffffff" LINK="#0000ee" TEXT="#000000" VLINK="#551a8b"
ALINK="#ff0000">
<IMG SRC="../../c++boost.gif"
ALT="C++ Boost" width="277" height="86">
<!--end header-->
<BR Clear>
<H1>CopyConstructible</H1>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<h3>Description</h3>
A type is CopyConstructible if it is possible to copy objects of that
type.
<html>
<head>
<meta http-equiv="Content-Language" content="en-us">
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<h3>Notation</h3>
<Table>
<TR>
<TD VAlign=top>
<tt>T</tt>
</TD>
<TD VAlign=top>
is type that is a model of CopyConstructible
</TD>
</TR>
<title>Copy Constructible</title>
</head>
<TR>
<TD VAlign=top>
<tt>t</tt>
</TD>
<TD VAlign=top>
is an object of type <tt>T</tt>
</TD>
</tr>
<body bgcolor="#FFFFFF" link="#0000EE" text="#000000" vlink="#551A8B" alink=
"#FF0000">
<img src="../../boost.png" alt="C++ Boost" width="277" height=
"86"><br clear="none">
<TR>
<TD VAlign=top>
<tt>u</tt>
</TD>
<TD VAlign=top>
is an object of type <tt>const T</tt>
</TD>
</tr>
<h1>Copy Constructible</h1>
</table>
<h3>Definitions</h3>
<h3>Valid expressions</h3>
<Table border>
<TR>
<TH>
Name
</TH>
<TH>
Expression
</TH>
<TH>
Return type
</TH>
<TH>
Semantics
</TH>
</TR>
<TR>
<TD VAlign=top>
Copy constructor
</TD>
<TD VAlign=top>
<tt>T(t)</tt>
</TD>
<TD VAlign=top>
<tt>T</tt>
</TD>
<TD VAlign=top>
<tt>t</tt> is equivalent to <tt>T(t)</tt>
</TD>
</TR>
<h3>Description</h3>
<p>A type is Copy Constructible if it is possible to copy objects of that
type.</p>
<TR>
<TD VAlign=top>
Copy constructor
</TD>
<TD VAlign=top>
<pre>
<h3>Notation</h3>
<table summary="">
<tr>
<td valign="top"><tt>T</tt></td>
<td valign="top">is type that is a model of Copy Constructible</td>
</tr>
<tr>
<td valign="top"><tt>t</tt></td>
<td valign="top">is an object of type <tt>T</tt></td>
</tr>
<tr>
<td valign="top"><tt>u</tt></td>
<td valign="top">is an object of type <tt>const T</tt></td>
</tr>
</table>
<h3>Definitions</h3>
<h3>Valid expressions</h3>
<table border summary="">
<tr>
<th>Name</th>
<th>Expression</th>
<th>Return type</th>
<th>Semantics</th>
</tr>
<tr>
<td valign="top">Copy constructor</td>
<td valign="top"><tt>T(t)</tt></td>
<td valign="top"><tt>T</tt></td>
<td valign="top"><tt>t</tt> is equivalent to <tt>T(t)</tt></td>
</tr>
<tr>
<td valign="top">Copy constructor</td>
<td valign="top">
<pre>
T(u)
</pre>
</TD>
<TD VAlign=top>
<tt>T</tt>
</TD>
<TD VAlign=top>
<tt>u</tt> is equivalent to <tt>T(u)</tt>
</TD>
</TR>
</td>
<td valign="top"><tt>T</tt></td>
<TR>
<TD VAlign=top>
Destructor
</TD>
<TD VAlign=top>
<pre>
<td valign="top"><tt>u</tt> is equivalent to <tt>T(u)</tt></td>
</tr>
<tr>
<td valign="top">Destructor</td>
<td valign="top">
<pre>
t.~T()
</pre>
</TD>
<TD VAlign=top>
<tt>T</tt>
</TD>
<TD VAlign=top>
&nbsp;
</TD>
</TR>
</td>
<TR>
<TD VAlign=top>
Address Operator
</TD>
<TD VAlign=top>
<pre>
<td valign="top"><tt>T</tt></td>
<td valign="top">&nbsp;</td>
</tr>
<tr>
<td valign="top">Address Operator</td>
<td valign="top">
<pre>
&amp;t
</pre>
</TD>
<TD VAlign=top>
<tt>T*</tt>
</TD>
<TD VAlign=top>
denotes the address of <tt>t</tt>
</TD>
</TR>
</td>
<TR>
<TD VAlign=top>
Address Operator
</TD>
<TD VAlign=top>
<pre>
<td valign="top"><tt>T*</tt></td>
<td valign="top">denotes the address of <tt>t</tt></td>
</tr>
<tr>
<td valign="top">Address Operator</td>
<td valign="top">
<pre>
&amp;u
</pre>
</TD>
<TD VAlign=top>
<tt>T*</tt>
</TD>
<TD VAlign=top>
denotes the address of <tt>u</tt>
</TD>
</TR>
</td>
<td valign="top"><tt>T*</tt></td>
<td valign="top">denotes the address of <tt>u</tt></td>
</tr>
</table>
</table>
<h3>Models</h3>
<ul>
<li><tt>int</tt></li>
</table>
<h3>Models</h3>
<li><tt>std::pair</tt></li>
</ul>
<UL>
<LI><tt>int</tt>
<LI><tt>std::pair</tt>
</UL>
<h3>Concept Checking Class</h3>
<pre>
template &lt;class T&gt;
struct CopyConstructibleConcept
{
void constraints() {
T a(b); // require copy constructor
T* ptr = &amp;a; // require address of operator
const_constraints(a);
ignore_unused_variable_warning(ptr);
}
void const_constraints(const T&amp; a) {
T c(a); // require const copy constructor
const T* ptr = &amp;a; // require const address of operator
ignore_unused_variable_warning(c);
ignore_unused_variable_warning(ptr);
}
T b;
};
</pre>
<h3>See also</h3>
<A
href="http://www.sgi.com/Technology/STL/DefaultConstructible.html">DefaultConstructible</A>
and
<A href="http://www.sgi.com/Technology/STL/Assignable.html">Assignable</A>
<h3>See also</h3>
<br>
<HR>
<TABLE>
<TR valign=top>
<TD nowrap>Copyright &copy 2000</TD><TD>
<A HREF=http://www.lsc.nd.edu/~jsiek>Jeremy Siek</A>, Univ.of Notre Dame (<A HREF="mailto:jsiek@lsc.nd.edu">jsiek@lsc.nd.edu</A>)
</TD></TR></TABLE>
<p><a href="http://www.sgi.com/tech/stl/DefaultConstructible.html">Default
Constructible</a> and <a href="./Assignable.html">Assignable</a><br></p>
<hr>
</BODY>
</HTML>
<p><a href="http://validator.w3.org/check?uri=referer"><img border="0" src=
"http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01 Transitional"
height="31" width="88"></a></p>
<p>Revised
<!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %B, %Y" startspan -->05
December, 2006<!--webbot bot="Timestamp" endspan i-checksum="38516" --></p>
<table summary="">
<tr valign="top">
<td nowrap><i>Copyright &copy; 2000</i></td>
<td><i><a href="http://www.lsc.nd.edu/~jsiek">Jeremy Siek</a>, Univ.of
Notre Dame (<a href=
"mailto:jsiek@lsc.nd.edu">jsiek@lsc.nd.edu</a>)</i></td>
</tr>
</table>
<p><i>Distributed under the Boost Software License, Version 1.0. (See
accompanying file <a href="../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or
copy at <a href=
"http://www.boost.org/LICENSE_1_0.txt">http://www.boost.org/LICENSE_1_0.txt</a>)</i></p>
</body>
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<html>
<!--
== Copyright (c) 1996-1999
== Silicon Graphics Computer Systems, Inc.
==
== Permission to use, copy, modify, distribute and sell this software
== and its documentation for any purpose is hereby granted without fee,
== provided that the above copyright notice appears in all copies and
== that both that copyright notice and this permission notice appear
== in supporting documentation. Silicon Graphics makes no
== representations about the suitability of this software for any
== purpose. It is provided "as is" without express or implied warranty.
==
== Copyright (c) 1994
== Hewlett-Packard Company
==
== Permission to use, copy, modify, distribute and sell this software
== and its documentation for any purpose is hereby granted without fee,
== provided that the above copyright notice appears in all copies and
== that both that copyright notice and this permission notice appear
== in supporting documentation. Hewlett-Packard Company makes no
== representations about the suitability of this software for any
== purpose. It is provided "as is" without express or implied warranty.
==
-->
<head>
<meta http-equiv="Content-Language" content="en-us">
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<title>LessThanComparable</title>
</head>
<body bgcolor="#FFFFFF" link="#0000EE" text="#000000" vlink="#551A8B" alink=
"#FF0000">
<img src="../../boost.png" alt="C++ Boost" width="277" height=
"86"><br clear="none">
<h1>LessThanComparable</h1>
<h3>Description</h3>
<p>A type is LessThanComparable if it is ordered: it must be possible to
compare two objects of that type using <tt>operator&lt;</tt>, and
<tt>operator&lt;</tt> must be a strict weak ordering relation.</p>
<h3>Refinement of</h3>
<h3>Associated types</h3>
<h3>Notation</h3>
<table summary="">
<tr>
<td valign="top"><tt>X</tt></td>
<td valign="top">A type that is a model of LessThanComparable</td>
</tr>
<tr>
<td valign="top"><tt>x</tt>, <tt>y</tt>, <tt>z</tt></td>
<td valign="top">Object of type <tt>X</tt></td>
</tr>
</table>
<h3>Definitions</h3>
<p>Consider the relation <tt>!(x &lt; y) &amp;&amp; !(y &lt; x)</tt>. If
this relation is transitive (that is, if <tt>!(x &lt; y) &amp;&amp; !(y
&lt; x) &amp;&amp; !(y &lt; z) &amp;&amp; !(z &lt; y)</tt> implies <tt>!(x
&lt; z) &amp;&amp; !(z &lt; x)</tt>), then it satisfies the mathematical
definition of an equivalence relation. In this case, <tt>operator&lt;</tt>
is a <i>strict weak ordering</i>.</p>
<p>If <tt>operator&lt;</tt> is a strict weak ordering, and if each
equivalence class has only a single element, then <tt>operator&lt;</tt> is
a <i>total ordering</i>.</p>
<h3>Valid expressions</h3>
<table border summary="">
<tr>
<th>Name</th>
<th>Expression</th>
<th>Type requirements</th>
<th>Return type</th>
</tr>
<tr>
<td valign="top">Less</td>
<td valign="top"><tt>x &lt; y</tt></td>
<td valign="top">&nbsp;</td>
<td valign="top">Convertible to <tt>bool</tt></td>
</tr>
</table>
<h3>Expression semantics</h3>
<table border summary="">
<tr>
<th>Name</th>
<th>Expression</th>
<th>Precondition</th>
<th>Semantics</th>
<th>Postcondition</th>
</tr>
<tr>
<td valign="top">Less</td>
<td valign="top"><tt>x &lt; y</tt></td>
<td valign="top"><tt>x</tt> and <tt>y</tt> are in the domain of
<tt>&lt;</tt></td>
<td valign="top">&nbsp;</td>
</tr>
</table>
<h3>Complexity guarantees</h3>
<h3>Invariants</h3>
<table border summary="">
<tr>
<td valign="top">Irreflexivity</td>
<td valign="top"><tt>x &lt; x</tt> must be false.</td>
</tr>
<tr>
<td valign="top">Antisymmetry</td>
<td valign="top"><tt>x &lt; y</tt> implies !(y &lt; x) <a href=
"#n2">[2]</a></td>
</tr>
<tr>
<td valign="top">Transitivity</td>
<td valign="top"><tt>x &lt; y</tt> and <tt>y &lt; z</tt> implies <tt>x
&lt; z</tt> <a href="#n3">[3]</a></td>
</tr>
</table>
<h3>Models</h3>
<ul>
<li>int</li>
</ul>
<h3>Notes</h3>
<p><a name="n1" id="n1">[1]</a> Only <tt>operator&lt;</tt> is fundamental;
the other inequality operators are essentially syntactic sugar.</p>
<p><a name="n2" id="n2">[2]</a> Antisymmetry is a theorem, not an axiom: it
follows from irreflexivity and transitivity.</p>
<p><a name="n3" id="n3">[3]</a> Because of irreflexivity and transitivity,
<tt>operator&lt;</tt> always satisfies the definition of a <i>partial
ordering</i>. The definition of a <i>strict weak ordering</i> is stricter,
and the definition of a <i>total ordering</i> is stricter still.</p>
<h3>See also</h3>
<p><a href=
"http://www.sgi.com/tech/stl/EqualityComparable.html">EqualityComparable</a>,
<a href=
"http://www.sgi.com/tech/stl/StrictWeakOrdering.html">StrictWeakOrdering</a><br>
</p>
<hr>
<p><a href="http://validator.w3.org/check?uri=referer"><img border="0" src=
"http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01 Transitional"
height="31" width="88"></a></p>
<p>Revised
<!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %B, %Y" startspan -->05
December, 2006<!--webbot bot="Timestamp" endspan i-checksum="38516" --></p>
<table summary="">
<tr valign="top">
<td nowrap><i>Copyright &copy; 2000</i></td>
<td><i><a href="http://www.lsc.nd.edu/~jsiek">Jeremy Siek</a>, Univ.of
Notre Dame (<a href=
"mailto:jsiek@lsc.nd.edu">jsiek@lsc.nd.edu</a>)</i></td>
</tr>
</table>
<p><i>Distributed under the Boost Software License, Version 1.0. (See
accompanying file <a href="../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or
copy at <a href=
"http://www.boost.org/LICENSE_1_0.txt">http://www.boost.org/LICENSE_1_0.txt</a>)</i></p>
</body>
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@ -1,92 +1,95 @@
<HTML>
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-- Copyright (c) Jeremy Siek 2000
--
-- Permission to use, copy, modify, distribute and sell this software
-- and its documentation for any purpose is hereby granted without fee,
-- provided that the above copyright notice appears in all copies and
-- that both that copyright notice and this permission notice appear
-- in supporting documentation. Silicon Graphics makes no
-- representations about the suitability of this software for any
-- purpose. It is provided "as is" without express or implied warranty.
-->
<Head>
<Title>MultiPassInputIterator</Title>
<BODY BGCOLOR="#ffffff" LINK="#0000ee" TEXT="#000000" VLINK="#551a8b"
ALINK="#ff0000">
<IMG SRC="../../c++boost.gif"
ALT="C++ Boost" width="277" height="86">
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<BR Clear>
<html>
<head>
<meta http-equiv="Content-Language" content="en-us">
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<H2>
<A NAME="concept:MultiPassInputIterator"></A>
MultiPassInputIterator
</H2>
<title>MultiPassInputIterator</title>
</head>
This concept is a refinement of <a
href="http://www.sgi.com/Technology/STL/InputIterator.html">InputIterator</a>,
adding the requirements that the iterator can be used to make multiple
passes through a range, and that if <TT>it1 == it2</TT> and
<TT>it1</TT> is dereferenceable then <TT>++it1 == ++it2</TT>. The
MultiPassInputIterator is very similar to the <a
href="http://www.sgi.com/Technology/STL/ForwardIterator.hmtl">ForwardIterator</a>. The
only difference is that a <a
href="http://www.sgi.com/Technology/STL/ForwardIterator.hmtl">ForwardIterator</a>
requires the <TT>reference</TT> type to be <TT>value_type&amp;</TT>, whereas
MultiPassInputIterator is like <a
href="http://www.sgi.com/Technology/STL/InputIterator.html">InputIterator</a>
in that the <TT>reference</TT> type merely has to be convertible to
<TT>value_type</TT>.
<body bgcolor="#FFFFFF" link="#0000EE" text="#000000" vlink="#551A8B" alink=
"#FF0000">
<img src="../../boost.png" alt="C++ Boost" width="277" height=
"86"><br clear="none">
<h2><a name="concept:MultiPassInputIterator" id=
"concept:MultiPassInputIterator"></a> Multi-Pass Input Iterator</h2>
<h3>Design Notes</h3>
<p>This concept is a refinement of <a href=
"http://www.sgi.com/tech/stl/InputIterator.html">Input Iterator</a>, adding
the requirements that the iterator can be used to make multiple passes
through a range, and that if <tt>it1 == it2</tt> and <tt>it1</tt> is
dereferenceable then <tt>++it1 == ++it2</tt>. The Multi-Pass Input Iterator
is very similar to the <a href=
"http://www.sgi.com/tech/stl/ForwardIterator.html">Forward Iterator</a>.
The only difference is that a <a href=
"http://www.sgi.com/tech/stl/ForwardIterator.html">Forward Iterator</a>
requires the <tt>reference</tt> type to be <tt>value_type&amp;</tt>,
whereas MultiPassInputIterator is like <a href=
"http://www.sgi.com/tech/stl/InputIterator.html">Input Iterator</a> in that
the <tt>reference</tt> type merely has to be convertible to
<tt>value_type</tt>.</p>
comments by Valentin Bonnard:
<h3>Design Notes</h3>
<p> I think that introducing MultiPassInputIterator isn't the right
solution. Do you also want to define MultiPassBidirectionnalIterator
and MultiPassRandomAccessIterator ? I don't, definitly. It only
confuses the issue. The problem lies into the existing hierarchy of
iterators, which mixes movabillity, modifiabillity and lvalue-ness,
and these are clearly independant.
<p>comments by Valentin Bonnard:</p>
<p> The terms Forward, Bidirectionnal and RandomAccess are about
movabillity and shouldn't be used to mean anything else. In a
completly orthogonal way, iterators can be immutable, mutable, or
neither. Lvalueness of iterators is also orthogonal with
immutabillity. With these clean concepts, your MultiPassInputIterator
is just called a ForwardIterator.
<p>I think that introducing Multi-Pass Input Iterator isn't the right
solution. Do you also want to define Multi-Pass Bidirectionnal Iterator and
Multi-Pass Random Access Iterator ? I don't, definitly. It only confuses
the issue. The problem lies into the existing hierarchy of iterators, which
mixes movabillity, modifiabillity and lvalue-ness, and these are clearly
independant.</p>
<p>
Other translations are:<br>
std::ForwardIterator -> ForwardIterator & LvalueIterator<br>
std::BidirectionnalIterator -> BidirectionnalIterator & LvalueIterator<br>
std::RandomAccessIterator -> RandomAccessIterator & LvalueIterator<br>
<p>The terms Forward, Bidirectionnal and Random Access are about
movabillity and shouldn't be used to mean anything else. In a completly
orthogonal way, iterators can be immutable, mutable, or neither. Lvalueness
of iterators is also orthogonal with immutabillity. With these clean
concepts, your Multi-Pass Input Iterator is just called a Forward
Iterator.</p>
<p>
Note that in practice the only operation not allowed on my
ForwardIterator which is allowed on std::ForwardIterator is
<tt>&*it</tt>. I think that <tt>&*</tt> is rarely needed in generic code.
<p>Other translations are:<br>
std::Forward Iterator -&gt; ForwardIterator &amp; Lvalue Iterator<br>
std::Bidirectionnal Iterator -&gt; Bidirectionnal Iterator &amp; Lvalue
Iterator<br>
std::Random Access Iterator -&gt; Random Access Iterator &amp; Lvalue
Iterator<br></p>
<p>
reply by Jeremy Siek:
<p>Note that in practice the only operation not allowed on my Forward
Iterator which is allowed on std::Forward Iterator is <tt>&amp;*it</tt>. I
think that <tt>&amp;*</tt> is rarely needed in generic code.</p>
<p>
The above analysis by Valentin is right on. Of course, there is
the problem with backward compatibility. The current STL implementations
are based on the old definition of ForwardIterator. The right course
of action is to get ForwardIterator, etc. changed in the C++ standard.
Once that is done we can drop MultiPassInputIterator.
<p>reply by Jeremy Siek:</p>
<p>The above analysis by Valentin is right on. Of course, there is the
problem with backward compatibility. The current STL implementations are
based on the old definition of Forward Iterator. The right course of action
is to get Forward Iterator, etc. changed in the C++ standard. Once that is
done we can drop Multi-Pass Input Iterator.<br></p>
<hr>
<br>
<HR>
<TABLE>
<TR valign=top>
<TD nowrap>Copyright &copy 2000</TD><TD>
<A HREF=http://www.boost.org/people/jeremy_siek.htm>Jeremy Siek</A>, Univ.of Notre Dame (<A HREF="mailto:jsiek@lsc.nd.edu">jsiek@lsc.nd.edu</A>)
</TD></TR></TABLE>
<p><a href="http://validator.w3.org/check?uri=referer"><img border="0" src=
"http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01 Transitional"
height="31" width="88"></a></p>
</BODY>
</HTML>
<p>Revised
<!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %B, %Y" startspan -->05
December, 2006<!--webbot bot="Timestamp" endspan i-checksum="38516" --></p>
<table summary="">
<tr valign="top">
<td nowrap><i>Copyright &copy; 2000</i></td>
<td><i><a href="http://www.lsc.nd.edu/~jsiek">Jeremy Siek</a>, Univ.of
Notre Dame (<a href=
"mailto:jsiek@lsc.nd.edu">jsiek@lsc.nd.edu</a>)</i></td>
</tr>
</table>
<p><i>Distributed under the Boost Software License, Version 1.0. (See
accompanying file <a href="../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or
copy at <a href=
"http://www.boost.org/LICENSE_1_0.txt">http://www.boost.org/LICENSE_1_0.txt</a>)</i></p>
</body>
</html>

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<HTML>
<Head>
<Title>OptionalPointee Concept</Title>
</HEAD>
<BODY BGCOLOR="#ffffff" LINK="#0000ee" TEXT="#000000" VLINK="#551a8b"
ALINK="#ff0000">
<IMG SRC="../../boost.png"
ALT="C++ Boost" width="277" height="86">
<!--end header-->
<BR Clear>
<H1>Concept: OptionalPointee</H1>
<h3>Description</h3>
A type is a model of <i>OptionalPointee</i> if it points to (or refers to) a value
that may not exist. That is, if it has a <b>pointee</b> which might be <b>valid</b>
(existent) or <b>invalid</b> (inexistent); and it is possible to test whether the
pointee is valid or not.
This model does <u>not</u> imply pointer semantics: i.e., it does not imply shallow copy nor
aliasing.
<h3>Notation</h3>
<Table>
<TR>
<TD VAlign=top> <tt>T</tt> </TD>
<TD VAlign=top> is a type that is a model of OptionalPointee</TD>
</TR>
<TR>
<TD VAlign=top> <tt>t</tt> </TD>
<TD VAlign=top> is an object of type <tt>T</tt> or possibly <tt>const T</tt></TD>
</tr>
</table>
<h3>Definitions</h3>
<h3>Valid expressions</h3>
<Table border>
<TR>
<TH> Name </TH>
<TH> Expression </TH>
<TH> Return type </TH>
<TH> Semantics </TH>
</TR>
<TR>
<TD VAlign=top>Value Access</TD>
<TD VAlign=top>&nbsp;<tt>*t</tt></TD>
<TD VAlign=top>&nbsp;<tt>T&amp;</tt></TD>
<TD VAlign=top>If the pointee is valid returns a reference to
the pointee.<br>
If the pointee is invalid the result is <i>undefined</i>.</TD>
<TD VAlign=top> </TD>
</TR>
<TR>
<TD VAlign=top>Value Access</TD>
<TD VAlign=top>&nbsp;<tt>t-><i>xyz</i></tt></TD>
<TD VAlign=top>&nbsp;<tt>T*</tt></TD>
<TD VAlign=top>If the pointee is valid returns a builtin pointer to the pointee.<br>
If the pointee is invalid the result is <i>undefined</i> (It might not even return NULL).<br>
</TD>
<TD VAlign=top> </TD>
</TR>
<TR>
<TD VAlign=top>Validity Test</TD>
<TD VAlign=top>&nbsp;<tt>t</tt><br>
&nbsp;<tt>t != 0</tt><br>
&nbsp;<tt>!!t</tt>
</TD>
<TD VAlign=top>&nbsp;bool </TD>
<TD VAlign=top>If the pointee is valid returns true.<br>
If the pointee is invalid returns false.</TD>
<TD VAlign=top></TD>
</TR>
<TR>
<TD VAlign=top>Invalidity Test</TD>
<TD VAlign=top>&nbsp;<tt>t == 0</tt><br>
&nbsp;<tt>!t</tt>
</TD>
<TD VAlign=top>&nbsp;bool </TD>
<TD VAlign=top>If the pointee is valid returns false.<br>
If the pointee is invalid returns true.</TD>
<TD VAlign=top></TD>
</TR>
</table>
<h3>Models</h3>
<UL>
<LI><tt>pointers, both builtin and smart.</tt>
<LI><tt>boost::optional&lt;&gt;</tt>
</UL>
<HR>
<h3>OptionalPointee and relational operations</h3>
<p>This concept does not define any particular semantic for relational operations, therefore,
a type which models this concept might have either shallow or deep relational semantics.<br>
For instance, pointers, which are models of OptionalPointee, have shallow relational operators:
comparisons of pointers do not involve comparisons of pointees.
This makes sense for pointers because they have shallow copy semantics.<br>
But boost::optional&lt;T&gt;, on the other hand, which is also a model of OptionalPointee, has
deep-copy and deep-relational semantics.<br>
If generic code is written for this concept, it is important not to use relational
operators directly because the semantics might be different depending on the actual type.<br>
Still, the concept itsef can be used to define <i>deep</i> relational tests that can
be used in generic code with any type which models OptionalPointee:</p>
<a name="equal"></a>
<p><u>Equivalence relation:</u></p>
<pre>template&lt;class OptionalPointee&gt;
inline
bool equal_pointees ( OptionalPointee const&amp; x, OptionalPointee const&amp; y )
{
return (!x) != (!y) ? false : ( !x ? true : (*x) == (*y) ) ;
}
template&lt;class OptionalPointee&gt;
struct equal_pointees_t : std::binary_function&lt;OptionalPointee,OptionalPointee,bool&gt;
{
bool operator() ( OptionalPointee const& x, OptionalPointee const& y ) const
{ return equal_pointees(x,y) ; }
} ;
</pre>
<p>The preceding generic function and function object have the following semantics:<br>
If both <b>x</b> and <b>y</b> have valid pointees, it compares values via <code>(*x == *y)</code>.<br>
If only one has a valid pointee, returns <code>false</code>.<br>
If both have invalid pointees, returns <code>true</code>.</p>
<a name="less"></a>
<p><u>Less-than relation:</u></p>
<pre>template&lt;class OptionalPointee&gt;
inline
bool less_pointees ( OptionalPointee const&amp; x, OptionalPointee const&amp; y )
{
return !y ? false : ( !x ? true : (*x) < (*y) ) ;
}
template&lt;class OptionalPointee&gt;
struct less_pointees_t : std::binary_function&lt;OptionalPointee,OptionalPointee,bool&gt;
{
bool operator() ( OptionalPointee const& x, OptionalPointee const& y ) const
{ return less_pointees(x,y) ; }
} ;
</pre>
<p>The preceding generic function and function object have the following semantics:<br>
If <b>y</b> has an invalid pointee, returns <code>false</code>.<br>
Else, if <b>x</b> has an invalid pointee, returns <code>true</code>.<br>
Else, ( <b>x</b> and <b>y</b> have valid pointees), compares values via <code>(*x &lt;
*y).</code></p>
<p><br>
All these functions and function
objects are is implemented in <a href="../../boost/utility/compare_pointees.hpp">compare_pointees.hpp</a></p>
<p>Notice that OptionalPointee does not imply aliasing (and optional&lt;&gt; for instance does not alias);
so direct usage of relational operators with the implied aliasing of shallow semantics
-as with pointers- should not be used with generic code written for this concept.</p>
<h3>Acknowledgements</h3>
<p>Based on the original concept developed by Augustus Saunders.
<br>
</p>
<HR>
<TABLE>
<TR valign=top>
<TD nowrap>Copyright &copy 2003</TD><TD>
<A HREF="mailto:fernando_cacciola@hotmail.com">Fernando Cacciola</A>
</TD></TR></TABLE>
<p>Distributed under the Boost Software License, Version 1.0. See
<a href="http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a></p>
</BODY>
</HTML>

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addressof_test.cpp Normal file
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// Copyright (C) 2002 Brad King (brad.king@kitware.com)
// Douglas Gregor (gregod@cs.rpi.edu)
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
// For more information, see http://www.boost.org
#include <boost/utility/addressof.hpp>
#if defined(BOOST_MSVC) && (BOOST_MSVC < 1300)
#pragma warning(push, 3)
#endif
#include <iostream>
#if defined(BOOST_MSVC) && (BOOST_MSVC < 1300)
#pragma warning(pop)
#endif
#include <boost/detail/lightweight_test.hpp>
template<class T> void scalar_test( T * = 0 )
{
T* px = new T();
T& x = *px;
BOOST_TEST( boost::addressof(x) == px );
const T& cx = *px;
const T* pcx = boost::addressof(cx);
BOOST_TEST( pcx == px );
volatile T& vx = *px;
volatile T* pvx = boost::addressof(vx);
BOOST_TEST( pvx == px );
const volatile T& cvx = *px;
const volatile T* pcvx = boost::addressof(cvx);
BOOST_TEST( pcvx == px );
delete px;
}
template<class T> void array_test( T * = 0 )
{
T nrg[3] = {1,2,3};
T (*pnrg)[3] = &nrg;
BOOST_TEST( boost::addressof(nrg) == pnrg );
T const cnrg[3] = {1,2,3};
T const (*pcnrg)[3] = &cnrg;
BOOST_TEST( boost::addressof(cnrg) == pcnrg );
}
struct addressable
{
addressable( int = 0 )
{
}
};
struct useless_type {};
class nonaddressable {
public:
nonaddressable( int = 0 )
{
}
void dummy(); // Silence GCC warning: all member of class are private
private:
useless_type operator&() const;
};
int main()
{
scalar_test<char>();
scalar_test<int>();
scalar_test<addressable>();
scalar_test<nonaddressable>();
array_test<char>();
array_test<int>();
array_test<addressable>();
array_test<nonaddressable>();
return boost::report_errors();
}

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@ -1,423 +0,0 @@
/*
*
* Copyright (c) 1999
* Dr John Maddock
*
* Permission to use, copy, modify, distribute and sell this software
* and its documentation for any purpose is hereby granted without fee,
* provided that the above copyright notice appear in all copies and
* that both that copyright notice and this permission notice appear
* in supporting documentation. Dr John Maddock makes no representations
* about the suitability of this software for any purpose.
* It is provided "as is" without express or implied warranty.
*
* This file provides some example of type_traits usage -
* by "optimising" various algorithms:
*
* opt::copy - optimised for trivial copy (cf std::copy)
* opt::fill - optimised for trivial copy/small types (cf std::fill)
* opt::destroy_array - an example of optimisation based upon omitted destructor calls
* opt::iter_swap - uses type_traits to determine whether the iterator is a proxy
* in which case it uses a "safe" approach, otherwise calls swap
* on the assumption that swap may be specialised for the pointed-to type.
*
*/
/* Release notes:
23rd July 2000:
Added explicit failure for broken compilers that don't support these examples.
Fixed broken gcc support (broken using directive).
Reordered tests slightly.
*/
#include <iostream>
#include <typeinfo>
#include <algorithm>
#include <iterator>
#include <vector>
#include <memory>
#include <boost/timer.hpp>
#include <boost/type_traits.hpp>
#include <boost/call_traits.hpp>
using std::cout;
using std::endl;
using std::cin;
#ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
#error "Sorry, without template partial specialisation support there isn't anything to test here..."
#endif
namespace opt{
//
// algorithm destroy_array:
// The reverse of std::unitialized_copy, takes a block of
// unitialized memory and calls destructors on all objects therein.
//
namespace detail{
template <bool>
struct array_destroyer
{
template <class T>
static void destroy_array(T* i, T* j){ do_destroy_array(i, j); }
};
template <>
struct array_destroyer<true>
{
template <class T>
static void destroy_array(T*, T*){}
};
template <class T>
void do_destroy_array(T* first, T* last)
{
while(first != last)
{
first->~T();
++first;
}
}
}; // namespace detail
template <class T>
inline void destroy_array(T* p1, T* p2)
{
detail::array_destroyer<boost::has_trivial_destructor<T>::value>::destroy_array(p1, p2);
}
//
// unoptimised versions of destroy_array:
//
template <class T>
void destroy_array1(T* first, T* last)
{
while(first != last)
{
first->~T();
++first;
}
}
template <class T>
void destroy_array2(T* first, T* last)
{
for(; first != last; ++first) first->~T();
}
//
// opt::copy
// same semantics as std::copy
// calls memcpy where appropiate.
//
namespace detail{
template <bool b>
struct copier
{
template<typename I1, typename I2>
static I2 do_copy(I1 first, I1 last, I2 out);
};
template <bool b>
template<typename I1, typename I2>
I2 copier<b>::do_copy(I1 first, I1 last, I2 out)
{
while(first != last)
{
*out = *first;
++out;
++first;
}
return out;
}
template <>
struct copier<true>
{
template<typename I1, typename I2>
static I2* do_copy(I1* first, I1* last, I2* out)
{
memcpy(out, first, (last-first)*sizeof(I2));
return out+(last-first);
}
};
}
template<typename I1, typename I2>
inline I2 copy(I1 first, I1 last, I2 out)
{
typedef typename boost::remove_cv<typename std::iterator_traits<I1>::value_type>::type v1_t;
typedef typename boost::remove_cv<typename std::iterator_traits<I2>::value_type>::type v2_t;
enum{ can_opt = boost::is_same<v1_t, v2_t>::value
&& boost::is_pointer<I1>::value
&& boost::is_pointer<I2>::value
&& boost::has_trivial_assign<v1_t>::value };
return detail::copier<can_opt>::do_copy(first, last, out);
}
//
// fill
// same as std::fill, uses memset where appropriate, along with call_traits
// to "optimise" parameter passing.
//
namespace detail{
template <bool opt>
struct filler
{
template <typename I, typename T>
static void do_fill(I first, I last, typename boost::call_traits<T>::param_type val);
};
template <bool b>
template <typename I, typename T>
void filler<b>::do_fill(I first, I last, typename boost::call_traits<T>::param_type val)
{
while(first != last)
{
*first = val;
++first;
}
}
template <>
struct filler<true>
{
template <typename I, typename T>
static void do_fill(I first, I last, T val)
{
memset(first, val, last-first);
}
};
}
template <class I, class T>
inline void fill(I first, I last, const T& val)
{
enum{ can_opt = boost::is_pointer<I>::value
&& boost::is_arithmetic<T>::value
&& (sizeof(T) == 1) };
typedef detail::filler<can_opt> filler_t;
filler_t::template do_fill<I,T>(first, last, val);
}
//
// iter_swap:
// tests whether iterator is a proxying iterator or not, and
// uses optimal form accordingly:
//
namespace detail{
template <bool b>
struct swapper
{
template <typename I>
static void do_swap(I one, I two)
{
typedef typename std::iterator_traits<I>::value_type v_t;
v_t v = *one;
*one = *two;
*two = v;
}
};
#ifdef __GNUC__
using std::swap;
#endif
template <>
struct swapper<true>
{
template <typename I>
static void do_swap(I one, I two)
{
using std::swap;
swap(*one, *two);
}
};
}
template <typename I1, typename I2>
inline void iter_swap(I1 one, I2 two)
{
typedef typename std::iterator_traits<I1>::reference r1_t;
typedef typename std::iterator_traits<I2>::reference r2_t;
enum{ can_opt = boost::is_reference<r1_t>::value && boost::is_reference<r2_t>::value && boost::is_same<r1_t, r2_t>::value };
detail::swapper<can_opt>::do_swap(one, two);
}
}; // namespace opt
//
// define some global data:
//
const int array_size = 1000;
int i_array[array_size] = {0,};
const int ci_array[array_size] = {0,};
char c_array[array_size] = {0,};
const char cc_array[array_size] = { 0,};
const int iter_count = 1000000;
int main()
{
//
// test destroy_array,
// compare destruction time of an array of ints
// with unoptimised form.
//
cout << "Measuring times in micro-seconds per 1000 elements processed" << endl << endl;
cout << "testing destroy_array...\n"
"[Some compilers may be able to optimise the \"unoptimised\"\n versions as well as type_traits does.]" << endl;
/*cache load*/ opt::destroy_array(i_array, i_array + array_size);
boost::timer t;
double result;
int i;
for(i = 0; i < iter_count; ++i)
{
opt::destroy_array(i_array, i_array + array_size);
}
result = t.elapsed();
cout << "destroy_array<int>: " << result << endl;
/*cache load*/ opt::destroy_array1(i_array, i_array + array_size);
t.restart();
for(i = 0; i < iter_count; ++i)
{
opt::destroy_array1(i_array, i_array + array_size);
}
result = t.elapsed();
cout << "destroy_array<int>(unoptimised#1): " << result << endl;
/*cache load*/ opt::destroy_array2(i_array, i_array + array_size);
t.restart();
for(i = 0; i < iter_count; ++i)
{
opt::destroy_array2(i_array, i_array + array_size);
}
result = t.elapsed();
cout << "destroy_array<int>(unoptimised#2): " << result << endl << endl;
cout << "testing fill(char)...\n"
"[Some standard library versions may already perform this optimisation.]" << endl;
/*cache load*/ opt::fill<char*, char>(c_array, c_array + array_size, (char)3);
t.restart();
for(i = 0; i < iter_count; ++i)
{
opt::fill<char*, char>(c_array, c_array + array_size, (char)3);
}
result = t.elapsed();
cout << "opt::fill<char*, char>: " << result << endl;
/*cache load*/ std::fill(c_array, c_array + array_size, (char)3);
t.restart();
for(i = 0; i < iter_count; ++i)
{
std::fill(c_array, c_array + array_size, (char)3);
}
result = t.elapsed();
cout << "std::fill<char*, char>: " << result << endl << endl;
cout << "testing fill(int)...\n"
"[Tests the effect of call_traits pass-by-value optimisation -\nthe value of this optimisation may depend upon hardware characteristics.]" << endl;
/*cache load*/ opt::fill<int*, int>(i_array, i_array + array_size, 3);
t.restart();
for(i = 0; i < iter_count; ++i)
{
opt::fill<int*, int>(i_array, i_array + array_size, 3);
}
result = t.elapsed();
cout << "opt::fill<int*, int>: " << result << endl;
/*cache load*/ std::fill(i_array, i_array + array_size, 3);
t.restart();
for(i = 0; i < iter_count; ++i)
{
std::fill(i_array, i_array + array_size, 3);
}
result = t.elapsed();
cout << "std::fill<int*, int>: " << result << endl << endl;
cout << "testing copy...\n"
"[Some standard library versions may already perform this optimisation.]" << endl;
/*cache load*/ opt::copy<const int*, int*>(ci_array, ci_array + array_size, i_array);
t.restart();
for(i = 0; i < iter_count; ++i)
{
opt::copy<const int*, int*>(ci_array, ci_array + array_size, i_array);
}
result = t.elapsed();
cout << "opt::copy<const int*, int*>: " << result << endl;
/*cache load*/ std::copy<const int*, int*>(ci_array, ci_array + array_size, i_array);
t.restart();
for(i = 0; i < iter_count; ++i)
{
std::copy<const int*, int*>(ci_array, ci_array + array_size, i_array);
}
result = t.elapsed();
cout << "std::copy<const int*, int*>: " << result << endl;
/*cache load*/ opt::detail::copier<false>::template do_copy<const int*, int*>(ci_array, ci_array + array_size, i_array);
t.restart();
for(i = 0; i < iter_count; ++i)
{
opt::detail::copier<false>::template do_copy<const int*, int*>(ci_array, ci_array + array_size, i_array);
}
result = t.elapsed();
cout << "standard \"unoptimised\" copy: " << result << endl << endl;
/*cache load*/ opt::copy<const char*, char*>(cc_array, cc_array + array_size, c_array);
t.restart();
for(i = 0; i < iter_count; ++i)
{
opt::copy<const char*, char*>(cc_array, cc_array + array_size, c_array);
}
result = t.elapsed();
cout << "opt::copy<const char*, char*>: " << result << endl;
/*cache load*/ std::copy<const char*, char*>(cc_array, cc_array + array_size, c_array);
t.restart();
for(i = 0; i < iter_count; ++i)
{
std::copy<const char*, char*>(cc_array, cc_array + array_size, c_array);
}
result = t.elapsed();
cout << "std::copy<const char*, char*>: " << result << endl;
/*cache load*/ opt::detail::copier<false>::template do_copy<const char*, char*>(cc_array, cc_array + array_size, c_array);
t.restart();
for(i = 0; i < iter_count; ++i)
{
opt::detail::copier<false>::template do_copy<const char*, char*>(cc_array, cc_array + array_size, c_array);
}
result = t.elapsed();
cout << "standard \"unoptimised\" copy: " << result << endl << endl;
//
// testing iter_swap
// really just a check that it does in fact compile...
std::vector<int> v1;
v1.push_back(0);
v1.push_back(1);
std::vector<bool> v2;
v2.push_back(0);
v2.push_back(1);
opt::iter_swap(v1.begin(), v1.begin()+1);
opt::iter_swap(v2.begin(), v2.begin()+1);
cout << "Press any key to exit...";
cin.get();
}

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title>Boost: assert.hpp documentation</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>
<body bgcolor="white" style="MARGIN-LEFT: 5%; MARGIN-RIGHT: 5%">
<table border="0" width="100%">
<tr>
<td width="277"><A href="../../index.htm"> <img src="../../boost.png" alt="boost.png (6897 bytes)" width="277" height="86" border="0"></A>
</td>
<td align="center">
<h1>assert.hpp</h1>
</td>
</tr>
<tr>
<td colspan="2" height="64">&nbsp;</td>
</tr>
</table>
<p>
The header <STRONG>&lt;boost/assert.hpp&gt;</STRONG> defines the macro <b>BOOST_ASSERT</b>,
which is similar to the standard <STRONG>assert</STRONG> macro defined in <STRONG>&lt;cassert&gt;</STRONG>.
The macro is intended to be used in Boost libraries.
</p>
<P>By default, <tt>BOOST_ASSERT(expr)</tt> is equivalent to <tt>assert(expr)</tt>.</P>
<P>When the macro <STRONG>BOOST_DISABLE_ASSERTS</STRONG> is defined when <STRONG>&lt;boost/assert.hpp&gt;</STRONG>
is included, <tt>BOOST_ASSERT(expr)</tt> is defined as <tt>((void)0)</tt>. This
allows users to selectively disable <STRONG>BOOST_ASSERT</STRONG> without
affecting the definition of the standard <STRONG>assert</STRONG>.</P>
<P>When the macro <STRONG>BOOST_ENABLE_ASSERT_HANDLER</STRONG> is defined when <STRONG>&lt;boost/assert.hpp&gt;</STRONG>
is included, <tt>BOOST_ASSERT(expr)</tt> evaluates <b>expr</b> and, if the
result is false, evaluates the expression</P>
<P><tt>::boost::assertion_failed(#expr, <a href="current_function.html">BOOST_CURRENT_FUNCTION</a>,
__FILE__, __LINE__)</tt></P>
<P><STRONG>assertion_failed</STRONG> is declared in <STRONG>&lt;boost/assert.hpp&gt;</STRONG>
as</P>
<pre>
namespace boost
{
void assertion_failed(char const * expr, char const * function, char const * file, long line);
}
</pre>
<p>but it is never defined. The user is expected to supply an appropriate
definition.</p>
<P>As is the case with <STRONG>&lt;cassert&gt;</STRONG>, <STRONG>&lt;boost/assert.hpp&gt;</STRONG>
can be included multiple times in a single translation unit. <STRONG>BOOST_ASSERT</STRONG>
will be redefined each time as specified above.</P>
<p><STRONG>&lt;boost/assert.hpp&gt;</STRONG> also defines the macro <STRONG>BOOST_VERIFY</STRONG>.
It has exactly the same behavior as <STRONG>BOOST_ASSERT</STRONG>, except that
the expression that is passed to <STRONG>BOOST_VERIFY</STRONG> is always
evaluated. This is useful when the asserted expression has desirable side
effects; it can also help suppress warnings about unused variables when the
only use of the variable is inside an assertion.</p>
<p><br>
<small>Copyright <20> 2002, 2007 by Peter Dimov. Distributed under the Boost Software
License, Version 1.0. See accompanying file <A href="../../LICENSE_1_0.txt">LICENSE_1_0.txt</A>
or copy at <A href="http://www.boost.org/LICENSE_1_0.txt">http://www.boost.org/LICENSE_1_0.txt</A>.</small></p>
</body>
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//
// assert_test.cpp - a test for boost/assert.hpp
//
// Copyright (c) 2002 Peter Dimov and Multi Media Ltd.
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
#include <boost/detail/lightweight_test.hpp>
#include <boost/assert.hpp>
void test_default()
{
int x = 1;
BOOST_ASSERT(1);
BOOST_ASSERT(x);
BOOST_ASSERT(x == 1);
BOOST_ASSERT(&x);
}
#define BOOST_DISABLE_ASSERTS
#include <boost/assert.hpp>
void test_disabled()
{
int x = 1;
BOOST_ASSERT(1);
BOOST_ASSERT(x);
BOOST_ASSERT(x == 1);
BOOST_ASSERT(&x);
BOOST_ASSERT(0);
BOOST_ASSERT(!x);
BOOST_ASSERT(x == 0);
void * p = 0;
BOOST_ASSERT(p);
// supress warnings
p = &x;
p = &p;
}
#undef BOOST_DISABLE_ASSERTS
#define BOOST_ENABLE_ASSERT_HANDLER
#include <boost/assert.hpp>
#include <boost/config.hpp>
#include <cstdio>
int handler_invoked = 0;
void boost::assertion_failed(char const * expr, char const * function, char const * file, long line)
{
#if !defined(BOOST_NO_STDC_NAMESPACE)
using std::printf;
#endif
printf("Expression: %s\nFunction: %s\nFile: %s\nLine: %ld\n\n", expr, function, file, line);
++handler_invoked;
}
struct X
{
static void f()
{
BOOST_ASSERT(0);
}
};
void test_handler()
{
int x = 1;
BOOST_ASSERT(1);
BOOST_ASSERT(x);
BOOST_ASSERT(x == 1);
BOOST_ASSERT(&x);
BOOST_ASSERT(0);
BOOST_ASSERT(!x);
BOOST_ASSERT(x == 0);
void * p = 0;
BOOST_ASSERT(p);
X::f();
BOOST_ASSERT(handler_invoked == 5);
BOOST_TEST(handler_invoked == 5);
}
#undef BOOST_ENABLE_ASSERT_HANDLER
int main()
{
test_default();
test_disabled();
test_handler();
return boost::report_errors();
}

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
<html>
<head>
<title>Boost: Base-from-Member Idiom Documentation</title>
</head>
<body bgcolor="white" link="blue" text="black" vlink="purple" alink="red">
<h1><img src="../../boost.png" alt="C++ Boost" align="middle"
width="277" height="86">Base-from-Member Idiom</h1>
<p>The class template <code>boost::base_from_member</code> provides
a workaround for a class that needs to initialize a base class with a
member. The class template is in <cite><a
href="../../boost/utility/base_from_member.hpp">boost/utility/base_from_member.hpp</a></cite>
which is included in <i><a href="../../boost/utility.hpp">boost/utility.hpp</a></i>.</p>
<p>There is test/example code in <cite><a
href="base_from_member_test.cpp">base_from_member_test.cpp</a></cite>.</p>
<h2><a name="contents">Contents</a></h2>
<ul>
<li><a href="#contents">Contents</a></li>
<li><a href="#rationale">Rationale</a></li>
<li><a href="#synopsis">Synopsis</a></li>
<li><a href="#usage">Usage</a></li>
<li><a href="#example">Example</a></li>
<li><a href="#credits">Credits</a>
<ul>
<li><a href="#contributors">Contributors</a></li>
</ul></li>
</ul>
<h2><a name="rationale">Rationale</a></h2>
<p>When developing a class, sometimes a base class needs to be
initialized with a member of the current class. As a na&iuml;ve
example:</p>
<blockquote><pre>
#include &lt;streambuf&gt; <i>// for std::streambuf</i>
#include &lt;ostream&gt; <i>// for std::ostream</i>
class fdoutbuf
: public std::streambuf
{
public:
explicit fdoutbuf( int fd );
//...
};
class fdostream
: public std::ostream
{
protected:
fdoutbuf buf;
public:
explicit fdostream( int fd )
: buf( fd ), std::ostream( &amp;buf )
{}
//...
};
</pre></blockquote>
<p>This is undefined because C++'s initialization order mandates that
the base class is initialized before the member it uses. <a
href="http://www.moocat.org">R. Samuel Klatchko</a> developed a way
around this by using the initialization order in his favor. Base
classes are intialized in order of declaration, so moving the desired
member to another base class, that is initialized before the desired
base class, can ensure proper initialization.</p>
<p>A custom base class can be made for this idiom:</p>
<blockquote><pre>
#include &lt;streambuf&gt; <i>// for std::streambuf</i>
#include &lt;ostream&gt; <i>// for std::ostream</i>
class fdoutbuf
: public std::streambuf
{
public:
explicit fdoutbuf( int fd );
//...
};
struct fdostream_pbase
{
fdoutbuf sbuffer;
explicit fdostream_pbase( int fd )
: sbuffer( fd )
{}
};
class fdostream
: private fdostream_pbase
, public std::ostream
{
typedef fdostream_pbase pbase_type;
typedef std::ostream base_type;
public:
explicit fdostream( int fd )
: pbase_type( fd ), base_type( &amp;sbuffer )
{}
//...
};
</pre></blockquote>
<p>Other projects can use similar custom base classes. The technique
is basic enough to make a template, with a sample template class in
this library. The main template parameter is the type of the enclosed
member. The template class has several (explicit) constructor member
templates, which implicitly type the constructor arguments and pass them
to the member. The template class uses implicit copy construction and
assignment, cancelling them if the enclosed member is non-copyable.</p>
<p>Manually coding a base class may be better if the construction
and/or copying needs are too complex for the supplied template class,
or if the compiler is not advanced enough to use it.</p>
<p>Since base classes are unnamed, a class cannot have multiple (direct)
base classes of the same type. The supplied template class has an
extra template parameter, an integer, that exists solely to provide type
differentiation. This parameter has a default value so a single use of a
particular member type does not need to concern itself with the integer.</p>
<h2><a name="synopsis">Synopsis</a></h2>
<blockquote><pre>
#ifndef BOOST_BASE_FROM_MEMBER_MAX_ARITY
#define BOOST_BASE_FROM_MEMBER_MAX_ARITY 10
#endif
template &lt; typename MemberType, int UniqueID = 0 &gt;
class boost::base_from_member
{
protected:
MemberType member;
base_from_member();
template&lt; typename T1 &gt;
explicit base_from_member( T1 x1 );
template&lt; typename T1, typename T2 &gt;
base_from_member( T1 x1, T2 x2 );
//...
template&lt; typename T1, typename T2, typename T3, typename T4,
typename T5, typename T6, typename T7, typename T8, typename T9,
typename T10 &gt;
base_from_member( T1 x1, T2 x2, T3 x3, T4 x4, T5 x5, T6 x6, T7 x7,
T8 x8, T9 x9, T10 x10 );
};
</pre></blockquote>
<p>The class template has a first template parameter
<var>MemberType</var> representing the type of the based-member.
It has a last template parameter <var>UniqueID</var>, that is an
<code>int</code>, to differentiate between multiple base classes that use
the same based-member type. The last template parameter has a default
value of zero if it is omitted. The class template has a protected
data member called <var>member</var> that the derived class can use
for later base classes (or itself).</p>
<p>There is a default constructor and several constructor member
templates. These constructor templates can take as many arguments
(currently up to ten) as possible and pass them to a constructor of
the data member. Since C++ does not allow any way to explicitly state
the template parameters of a templated constructor, make sure that
the arguments are already close as possible to the actual type used in
the data member's desired constructor.</p>
<p>The <var>BOOST_BASE_FROM_MEMBER_MAX_ARITY</var> macro constant specifies
the maximum argument length for the constructor templates. The constant
may be overridden if more (or less) argument configurations are needed. The
constant may be read for code that is expandable like the class template and
needs to maintain the same maximum size. (Example code would be a class that
uses this class template as a base class for a member with a flexible set of
constructors.)</p>
<h2><a name="usage">Usage</a></h2>
<p>With the starting example, the <code>fdoutbuf</code> sub-object needs
to be encapsulated in a base class that is inheirited before
<code>std::ostream</code>.</p>
<blockquote><pre>
#include &lt;boost/utility/base_from_member.hpp&gt;
#include &lt;streambuf&gt; <i>// for std::streambuf</i>
#include &lt;ostream&gt; <i>// for std::ostream</i>
class fdoutbuf
: public std::streambuf
{
public:
explicit fdoutbuf( int fd );
//...
};
class fdostream
: private boost::base_from_member&lt;fdoutbuf&gt;
, public std::ostream
{
// Helper typedef's
typedef boost::base_from_member&lt;fdoutbuf&gt; pbase_type;
typedef std::ostream base_type;
public:
explicit fdostream( int fd )
: pbase_type( fd ), base_type( &amp;member )
{}
//...
};
</pre></blockquote>
<p>The base-from-member idiom is an implementation detail, so it
should not be visible to the clients (or any derived classes) of
<code>fdostream</code>. Due to the initialization order, the
<code>fdoutbuf</code> sub-object will get initialized before the
<code>std::ostream</code> sub-object does, making the former
sub-object safe to use in the latter sub-object's construction. Since the
<code>fdoutbuf</code> sub-object of the final type is the only sub-object
with the name &quot;member,&quot; that name can be used
unqualified within the final class.</p>
<h2><a name="example">Example</a></h2>
<p>The base-from-member class templates should commonly involve
only one base-from-member sub-object, usually for attaching a
stream-buffer to an I/O stream. The next example demonstrates how
to use multiple base-from-member sub-objects and the resulting
qualification issues.</p>
<blockquote><pre>
#include &lt;boost/utility/base_from_member.hpp&gt;
#include &lt;cstddef&gt; <i>// for NULL</i>
struct an_int
{
int y;
an_int( float yf );
};
class switcher
{
public:
switcher();
switcher( double, int * );
//...
};
class flow_regulator
{
public:
flow_regulator( switcher &amp;, switcher &amp; );
//...
};
template &lt; unsigned Size &gt;
class fan
{
public:
explicit fan( switcher );
//...
};
class system
: private boost::base_from_member&lt;an_int&gt;
, private boost::base_from_member&lt;switcher&gt;
, private boost::base_from_member&lt;switcher, 1&gt;
, private boost::base_from_member&lt;switcher, 2&gt;
, protected flow_regulator
, public fan&lt;6&gt;
{
// Helper typedef's
typedef boost::base_from_member&lt;an_int&gt; pbase0_type;
typedef boost::base_from_member&lt;switcher&gt; pbase1_type;
typedef boost::base_from_member&lt;switcher, 1&gt; pbase2_type;
typedef boost::base_from_member&lt;switcher, 2&gt; pbase3_type;
typedef flow_regulator base1_type;
typedef fan&lt;6&gt; base2_type;
public:
system( double x );
//...
};
system::system( double x )
: pbase0_type( 0.2 )
, pbase1_type()
, pbase2_type( -16, &amp;this-&gt;pbase0_type::member )
, pbase3_type( x, static_cast&lt;int *&gt;(NULL) )
, base1_type( pbase3_type::member, pbase1_type::member )
, base2_type( pbase2_type::member )
{
//...
}
</pre></blockquote>
<p>The final class has multiple sub-objects with the name
&quot;member,&quot; so any use of that name needs qualification by
a name of the appropriate base type. (Using <code>typedef</code>s
ease mentioning the base types.) However, the fix introduces a new
problem when a pointer is needed. Using the address operator with
a sub-object qualified with its class's name results in a pointer-to-member
(here, having a type of <code>an_int boost::base_from_member&lt;an_int,
0&gt; :: *</code>) instead of a pointer to the member (having a type of
<code>an_int *</code>). The new problem is fixed by qualifying the
sub-object with &quot;<code>this-&gt;</code>,&quot; and is needed just
for pointers, and not for references or values.</p>
<p>There are some argument conversions in the initialization. The
constructor argument for <code>pbase0_type</code> is converted from
<code>double</code> to <code>float</code>. The first constructor
argument for <code>pbase2_type</code> is converted from <code>int</code>
to <code>double</code>. The second constructor argument for
<code>pbase3_type</code> is a special case of necessary conversion; all
forms of the null-pointer literal in C++ also look like compile-time
integral expressions, so C++ always interprets such code as an integer
when it has overloads that can take either an integer or a pointer. The
last conversion is necessary for the compiler to call a constructor form
with the exact pointer type used in <code>switcher</code>'s constructor.</p>
<h2><a name="credits">Credits</a></h2>
<h3><a name="contributors">Contributors</a></h3>
<dl>
<dt><a href="http://www.boost.org/people/ed_brey.htm">Ed Brey</a>
<dd>Suggested some interface changes.
<dt><a href="http://www.moocat.org">R. Samuel Klatchko</a> (<a
href="mailto:rsk@moocat.org">rsk@moocat.org</a>, <a
href="mailto:rsk@brightmail.com">rsk@brightmail.com</a>)
<dd>Invented the idiom of how to use a class member for initializing
a base class.
<dt><a href="http://www.boost.org/people/dietmar_kuehl.htm">Dietmar Kuehl</a>
<dd>Popularized the base-from-member idiom in his
<a href="http://www.informatik.uni-konstanz.de/~kuehl/c++/iostream/">IOStream
example classes</a>.
<dt>Jonathan Turkanis
<dd>Supplied an implementation of generating the constructor templates that
can be controlled and automated with macros. The implementation uses
the <a href="../preprocessor/index.html">Preprocessor library</a>.
<dt><a href="http://www.boost.org/people/daryle_walker.html">Daryle Walker</a>
<dd>Started the library. Contributed the test file <cite><a
href="base_from_member_test.cpp">base_from_member_test.cpp</a></cite>.
</dl>
<hr>
<p>Revised: 28 August 2004</p>
<p>Copyright 2001, 2003, 2004 Daryle Walker. Use, modification, and distribution
are subject to the Boost Software License, Version 1.0. (See accompanying
file <a href="../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or a copy at &lt;<a
href="http://www.boost.org/LICENSE_1_0.txt">http://www.boost.org/LICENSE_1_0.txt</a>&gt;.)</p>
</body>
</html>

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// Boost test program for base-from-member class templates -----------------//
// Copyright 2001, 2003 Daryle Walker. Use, modification, and distribution are
// subject to the Boost Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or a copy at <http://www.boost.org/LICENSE_1_0.txt>.)
// See <http://www.boost.org/libs/utility/> for the library's home page.
// Revision History
// 14 Jun 2003 Adjusted code for Boost.Test changes (Daryle Walker)
// 29 Aug 2001 Initial Version (Daryle Walker)
#include <boost/test/minimal.hpp> // for BOOST_CHECK, main
#include <boost/config.hpp> // for BOOST_NO_MEMBER_TEMPLATES
#include <boost/cstdlib.hpp> // for boost::exit_success
#include <boost/noncopyable.hpp> // for boost::noncopyable
#include <boost/utility/base_from_member.hpp> // for boost::base_from_member
#include <functional> // for std::binary_function, std::less
#include <iostream> // for std::cout (std::ostream, std::endl indirectly)
#include <set> // for std::set
#include <typeinfo> // for std::type_info
#include <utility> // for std::pair, std::make_pair
#include <vector> // for std::vector
// Control if extra information is printed
#ifndef CONTROL_EXTRA_PRINTING
#define CONTROL_EXTRA_PRINTING 1
#endif
// A (sub)object can be identified by its memory location and its type.
// Both are needed since an object can start at the same place as its
// first base class subobject and/or contained subobject.
typedef std::pair< void *, std::type_info const * > object_id;
// Object IDs need to be printed
std::ostream & operator <<( std::ostream &os, object_id const &oi );
// A way to generate an object ID
template < typename T >
object_id identify( T &obj );
// A custom comparison type is needed
struct object_id_compare
: std::binary_function<object_id, object_id, bool>
{
bool operator ()( object_id const &a, object_id const &b ) const;
}; // object_id_compare
// A singleton of this type coordinates the acknowledgements
// of objects being created and used.
class object_registrar
: private boost::noncopyable
{
public:
#ifndef BOOST_NO_MEMBER_TEMPLATES
template < typename T >
void register_object( T &obj )
{ this->register_object_imp( identify(obj) ); }
template < typename T, typename U >
void register_use( T &owner, U &owned )
{ this->register_use_imp( identify(owner), identify(owned) ); }
template < typename T, typename U >
void unregister_use( T &owner, U &owned )
{ this->unregister_use_imp( identify(owner), identify(owned) ); }
template < typename T >
void unregister_object( T &obj )
{ this->unregister_object_imp( identify(obj) ); }
#endif
void register_object_imp( object_id obj );
void register_use_imp( object_id owner, object_id owned );
void unregister_use_imp( object_id owner, object_id owned );
void unregister_object_imp( object_id obj );
typedef std::set<object_id, object_id_compare> set_type;
typedef std::vector<object_id> error_record_type;
typedef std::vector< std::pair<object_id, object_id> > error_pair_type;
set_type db_;
error_pair_type defrauders_in_, defrauders_out_;
error_record_type overeager_, overkilled_;
}; // object_registrar
// A sample type to be used by containing types
class base_or_member
{
public:
explicit base_or_member( int x = 1, double y = -0.25 );
~base_or_member();
}; // base_or_member
// A sample type that uses base_or_member, used
// as a base for the main demonstration classes
class base_class
{
public:
explicit base_class( base_or_member &x, base_or_member *y = 0,
base_or_member *z = 0 );
~base_class();
private:
base_or_member *x_, *y_, *z_;
}; // base_class
// This bad class demonstrates the direct method of a base class needing
// to be initialized by a member. This is improper since the member
// isn't initialized until after the base class.
class bad_class
: public base_class
{
public:
bad_class();
~bad_class();
private:
base_or_member x_;
}; // bad_class
// The first good class demonstrates the correct way to initialize a
// base class with a member. The member is changed to another base
// class, one that is initialized before the base that needs it.
class good_class_1
: private boost::base_from_member<base_or_member>
, public base_class
{
typedef boost::base_from_member<base_or_member> pbase_type;
typedef base_class base_type;
public:
good_class_1();
~good_class_1();
}; // good_class_1
// The second good class also demonstrates the correct way to initialize
// base classes with other subobjects. This class uses the other helpers
// in the library, and shows the technique of using two base subobjects
// of the "same" type.
class good_class_2
: private boost::base_from_member<base_or_member, 0>
, private boost::base_from_member<base_or_member, 1>
, private boost::base_from_member<base_or_member, 2>
, public base_class
{
typedef boost::base_from_member<base_or_member, 0> pbase_type0;
typedef boost::base_from_member<base_or_member, 1> pbase_type1;
typedef boost::base_from_member<base_or_member, 2> pbase_type2;
typedef base_class base_type;
public:
good_class_2();
~good_class_2();
}; // good_class_2
// Declare/define the single object registrar
object_registrar obj_reg;
// Main functionality
int
test_main( int , char * [] )
{
BOOST_CHECK( obj_reg.db_.empty() );
BOOST_CHECK( obj_reg.defrauders_in_.empty() );
BOOST_CHECK( obj_reg.defrauders_out_.empty() );
BOOST_CHECK( obj_reg.overeager_.empty() );
BOOST_CHECK( obj_reg.overkilled_.empty() );
// Make a separate block to examine pre- and post-effects
{
using std::cout;
using std::endl;
bad_class bc;
BOOST_CHECK( obj_reg.db_.size() == 3 );
BOOST_CHECK( obj_reg.defrauders_in_.size() == 1 );
good_class_1 gc1;
BOOST_CHECK( obj_reg.db_.size() == 6 );
BOOST_CHECK( obj_reg.defrauders_in_.size() == 1 );
good_class_2 gc2;
BOOST_CHECK( obj_reg.db_.size() == 11 );
BOOST_CHECK( obj_reg.defrauders_in_.size() == 1 );
BOOST_CHECK( obj_reg.defrauders_out_.empty() );
BOOST_CHECK( obj_reg.overeager_.empty() );
BOOST_CHECK( obj_reg.overkilled_.empty() );
// Getting the addresses of the objects ensure
// that they're used, and not optimized away.
cout << "Object 'bc' is at " << &bc << '.' << endl;
cout << "Object 'gc1' is at " << &gc1 << '.' << endl;
cout << "Object 'gc2' is at " << &gc2 << '.' << endl;
}
BOOST_CHECK( obj_reg.db_.empty() );
BOOST_CHECK( obj_reg.defrauders_in_.size() == 1 );
BOOST_CHECK( obj_reg.defrauders_out_.size() == 1 );
BOOST_CHECK( obj_reg.overeager_.empty() );
BOOST_CHECK( obj_reg.overkilled_.empty() );
return boost::exit_success;
}
// Print an object's ID
std::ostream &
operator <<
(
std::ostream & os,
object_id const & oi
)
{
// I had an std::ostringstream to help, but I did not need it since
// the program never screws around with formatting. Worse, using
// std::ostringstream is an issue with some compilers.
return os << '[' << ( oi.second ? oi.second->name() : "NOTHING" )
<< " at " << oi.first << ']';
}
// Get an object ID given an object
template < typename T >
inline
object_id
identify
(
T & obj
)
{
return std::make_pair( static_cast<void *>(&obj), &(typeid( obj )) );
}
// Compare two object IDs
bool
object_id_compare::operator ()
(
object_id const & a,
object_id const & b
) const
{
std::less<void *> vp_cmp;
if ( vp_cmp(a.first, b.first) )
{
return true;
}
else if ( vp_cmp(b.first, a.first) )
{
return false;
}
else
{
// object pointers are equal, compare the types
if ( a.second == b.second )
{
return false;
}
else if ( !a.second )
{
return true; // NULL preceeds anything else
}
else if ( !b.second )
{
return false; // NULL preceeds anything else
}
else
{
return a.second->before( *b.second );
}
}
}
// Let an object register its existence
void
object_registrar::register_object_imp
(
object_id obj
)
{
if ( db_.count(obj) <= 0 )
{
db_.insert( obj );
#if CONTROL_EXTRA_PRINTING
std::cout << "Registered " << obj << '.' << std::endl;
#endif
}
else
{
overeager_.push_back( obj );
#if CONTROL_EXTRA_PRINTING
std::cout << "Attempted to register a non-existant " << obj
<< '.' << std::endl;
#endif
}
}
// Let an object register its use of another object
void
object_registrar::register_use_imp
(
object_id owner,
object_id owned
)
{
if ( db_.count(owned) > 0 )
{
// We don't care to record usage registrations
}
else
{
defrauders_in_.push_back( std::make_pair(owner, owned) );
#if CONTROL_EXTRA_PRINTING
std::cout << "Attempted to own a non-existant " << owned
<< " by " << owner << '.' << std::endl;
#endif
}
}
// Let an object un-register its use of another object
void
object_registrar::unregister_use_imp
(
object_id owner,
object_id owned
)
{
if ( db_.count(owned) > 0 )
{
// We don't care to record usage un-registrations
}
else
{
defrauders_out_.push_back( std::make_pair(owner, owned) );
#if CONTROL_EXTRA_PRINTING
std::cout << "Attempted to disown a non-existant " << owned
<< " by " << owner << '.' << std::endl;
#endif
}
}
// Let an object un-register its existence
void
object_registrar::unregister_object_imp
(
object_id obj
)
{
set_type::iterator const i = db_.find( obj );
if ( i != db_.end() )
{
db_.erase( i );
#if CONTROL_EXTRA_PRINTING
std::cout << "Unregistered " << obj << '.' << std::endl;
#endif
}
else
{
overkilled_.push_back( obj );
#if CONTROL_EXTRA_PRINTING
std::cout << "Attempted to unregister a non-existant " << obj
<< '.' << std::endl;
#endif
}
}
// Macros to abstract the registration of objects
#ifndef BOOST_NO_MEMBER_TEMPLATES
#define PRIVATE_REGISTER_BIRTH(o) obj_reg.register_object( (o) )
#define PRIVATE_REGISTER_DEATH(o) obj_reg.unregister_object( (o) )
#define PRIVATE_REGISTER_USE(o, w) obj_reg.register_use( (o), (w) )
#define PRIVATE_UNREGISTER_USE(o, w) obj_reg.unregister_use( (o), (w) )
#else
#define PRIVATE_REGISTER_BIRTH(o) obj_reg.register_object_imp( \
identify((o)) )
#define PRIVATE_REGISTER_DEATH(o) obj_reg.unregister_object_imp( \
identify((o)) )
#define PRIVATE_REGISTER_USE(o, w) obj_reg.register_use_imp( identify((o)), \
identify((w)) )
#define PRIVATE_UNREGISTER_USE(o, w) obj_reg.unregister_use_imp( \
identify((o)), identify((w)) )
#endif
// Create a base_or_member, with arguments to simulate member initializations
base_or_member::base_or_member
(
int x, // = 1
double y // = -0.25
)
{
PRIVATE_REGISTER_BIRTH( *this );
#if CONTROL_EXTRA_PRINTING
std::cout << "\tMy x-factor is " << x << " and my y-factor is " << y
<< '.' << std::endl;
#endif
}
// Destroy a base_or_member
inline
base_or_member::~base_or_member
(
)
{
PRIVATE_REGISTER_DEATH( *this );
}
// Create a base_class, registering any objects used
base_class::base_class
(
base_or_member & x,
base_or_member * y, // = 0
base_or_member * z // = 0
)
: x_( &x ), y_( y ), z_( z )
{
PRIVATE_REGISTER_BIRTH( *this );
#if CONTROL_EXTRA_PRINTING
std::cout << "\tMy x-factor is " << x_;
#endif
PRIVATE_REGISTER_USE( *this, *x_ );
if ( y_ )
{
#if CONTROL_EXTRA_PRINTING
std::cout << ", my y-factor is " << y_;
#endif
PRIVATE_REGISTER_USE( *this, *y_ );
}
if ( z_ )
{
#if CONTROL_EXTRA_PRINTING
std::cout << ", my z-factor is " << z_;
#endif
PRIVATE_REGISTER_USE( *this, *z_ );
}
#if CONTROL_EXTRA_PRINTING
std::cout << '.' << std::endl;
#endif
}
// Destroy a base_class, unregistering the objects it uses
base_class::~base_class
(
)
{
PRIVATE_REGISTER_DEATH( *this );
#if CONTROL_EXTRA_PRINTING
std::cout << "\tMy x-factor was " << x_;
#endif
PRIVATE_UNREGISTER_USE( *this, *x_ );
if ( y_ )
{
#if CONTROL_EXTRA_PRINTING
std::cout << ", my y-factor was " << y_;
#endif
PRIVATE_UNREGISTER_USE( *this, *y_ );
}
if ( z_ )
{
#if CONTROL_EXTRA_PRINTING
std::cout << ", my z-factor was " << z_;
#endif
PRIVATE_UNREGISTER_USE( *this, *z_ );
}
#if CONTROL_EXTRA_PRINTING
std::cout << '.' << std::endl;
#endif
}
// Create a bad_class, noting the improper construction order
bad_class::bad_class
(
)
: x_( -7, 16.75 ), base_class( x_ ) // this order doesn't matter
{
PRIVATE_REGISTER_BIRTH( *this );
#if CONTROL_EXTRA_PRINTING
std::cout << "\tMy factor is at " << &x_
<< " and my base is at " << static_cast<base_class *>(this) << '.'
<< std::endl;
#endif
}
// Destroy a bad_class, noting the improper destruction order
bad_class::~bad_class
(
)
{
PRIVATE_REGISTER_DEATH( *this );
#if CONTROL_EXTRA_PRINTING
std::cout << "\tMy factor was at " << &x_
<< " and my base was at " << static_cast<base_class *>(this)
<< '.' << std::endl;
#endif
}
// Create a good_class_1, noting the proper construction order
good_class_1::good_class_1
(
)
: pbase_type( 8 ), base_type( member )
{
PRIVATE_REGISTER_BIRTH( *this );
#if CONTROL_EXTRA_PRINTING
std::cout << "\tMy factor is at " << &member
<< " and my base is at " << static_cast<base_class *>(this) << '.'
<< std::endl;
#endif
}
// Destroy a good_class_1, noting the proper destruction order
good_class_1::~good_class_1
(
)
{
PRIVATE_REGISTER_DEATH( *this );
#if CONTROL_EXTRA_PRINTING
std::cout << "\tMy factor was at " << &member
<< " and my base was at " << static_cast<base_class *>(this)
<< '.' << std::endl;
#endif
}
// Create a good_class_2, noting the proper construction order
good_class_2::good_class_2
(
)
: pbase_type0(), pbase_type1(-16, 0.125), pbase_type2(2, -3)
, base_type( pbase_type1::member, &this->pbase_type0::member,
&this->pbase_type2::member )
{
PRIVATE_REGISTER_BIRTH( *this );
#if CONTROL_EXTRA_PRINTING
std::cout << "\tMy factors are at " << &this->pbase_type0::member
<< ", " << &this->pbase_type1::member << ", "
<< &this->pbase_type2::member << ", and my base is at "
<< static_cast<base_class *>(this) << '.' << std::endl;
#endif
}
// Destroy a good_class_2, noting the proper destruction order
good_class_2::~good_class_2
(
)
{
PRIVATE_REGISTER_DEATH( *this );
#if CONTROL_EXTRA_PRINTING
std::cout << "\tMy factors were at " << &this->pbase_type0::member
<< ", " << &this->pbase_type1::member << ", "
<< &this->pbase_type2::member << ", and my base was at "
<< static_cast<base_class *>(this) << '.' << std::endl;
#endif
}

258
binary_search_test.cpp Normal file
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// (C) Copyright David Abrahams 2000.
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#include <vector>
#include <string>
#include <memory>
#include <climits>
#include <iostream>
#include <cassert>
#include <stdlib.h> // for rand(). Would use cstdlib but VC6.4 doesn't put it in std::
#include <list>
#include <algorithm>
#include <boost/detail/binary_search.hpp>
#include <boost/detail/workaround.hpp>
#include <cstddef>
#if defined(__SGI_STL_PORT) ? defined(__SGI_STL_OWN_IOSTREAMS) : (!defined(__GNUC__) || __GNUC__ > 2)
# define USE_SSTREAM
#endif
#ifdef USE_SSTREAM
# include <sstream>
#else
# include <strstream>
#endif
namespace {
// In order to get ADL to find the comparison operators defined below, they have
struct mystring : std::string
{
typedef std::string base;
mystring(std::string const& x)
: base(x) {}
};
typedef std::vector<mystring> string_vector;
const std::size_t sequence_length = 1000;
unsigned random_number()
{
return static_cast<unsigned>(::rand()) % sequence_length;
}
# ifndef USE_SSTREAM
class unfreezer {
public:
unfreezer(std::ostrstream& s) : m_stream(s) {}
~unfreezer() { m_stream.freeze(false); }
private:
std::ostrstream& m_stream;
};
# endif
template <class T>
void push_back_random_number_string(T& seq)
{
unsigned value = random_number();
# if defined(__SGI_STL_PORT) ? defined(__SGI_STL_OWN_IOSTREAMS) : (!defined(__GNUC__) || __GNUC__ > 2)
std::ostringstream s;
s << value;
seq.push_back(s.str());
# else
std::ostrstream s;
auto unfreezer unfreeze(s);
s << value << char(0);
seq.push_back(std::string(s.str()));
# endif
}
inline unsigned to_int(unsigned x) { return x; }
inline unsigned to_int(const std::string& x) { return atoi(x.c_str()); }
struct cmp
{
template <class A1, class A2>
inline bool operator()(const A1& a1, const A2& a2) const
{
return to_int(a1) < to_int(a2);
}
};
inline bool operator<(const mystring& x, const unsigned y)
{
return to_int(x) < y;
}
inline bool operator<(const unsigned y, const mystring& x)
{
return y < to_int(x);
}
template <class T>
void sort_by_value(T& x);
template <class T>
void sort_by_value_(T& v, long)
{
std::sort(v.begin(), v.end(), cmp());
}
template <class T>
void random_sorted_sequence(T& seq)
{
seq.clear();
for (std::size_t i = 0; i < sequence_length; ++i)
{
push_back_random_number_string(seq);
}
sort_by_value(seq);
}
template <class T, class A>
void sort_by_value_(std::list<T,A>& l, int)
{
# if BOOST_WORKAROUND(BOOST_DINKUMWARE_STDLIB, == 1) && !defined(__SGI_STL_PORT)
// VC6's standard lib doesn't have a template member function for list::sort()
std::vector<T> seq;
seq.reserve(sequence_length);
std::copy(l.begin(), l.end(), std::back_inserter(seq));
sort_by_value(seq);
std::copy(seq.begin(), seq.end(), l.begin());
# else
l.sort(cmp());
# endif
}
template <class T>
void sort_by_value(T& x)
{
(sort_by_value_)(x, 1);
}
// A way to select the comparisons with/without a Compare parameter for testing.
template <class Compare> struct searches
{
template <class Iterator, class Key>
static Iterator lower_bound(Iterator start, Iterator finish, Key key, Compare cmp)
{ return boost::detail::lower_bound(start, finish, key, cmp); }
template <class Iterator, class Key>
static Iterator upper_bound(Iterator start, Iterator finish, Key key, Compare cmp)
{ return boost::detail::upper_bound(start, finish, key, cmp); }
template <class Iterator, class Key>
static std::pair<Iterator, Iterator> equal_range(Iterator start, Iterator finish, Key key, Compare cmp)
{ return boost::detail::equal_range(start, finish, key, cmp); }
template <class Iterator, class Key>
static bool binary_search(Iterator start, Iterator finish, Key key, Compare cmp)
{ return boost::detail::binary_search(start, finish, key, cmp); }
};
struct no_compare {};
template <> struct searches<no_compare>
{
template <class Iterator, class Key>
static Iterator lower_bound(Iterator start, Iterator finish, Key key, no_compare)
{ return boost::detail::lower_bound(start, finish, key); }
template <class Iterator, class Key>
static Iterator upper_bound(Iterator start, Iterator finish, Key key, no_compare)
{ return boost::detail::upper_bound(start, finish, key); }
template <class Iterator, class Key>
static std::pair<Iterator, Iterator> equal_range(Iterator start, Iterator finish, Key key, no_compare)
{ return boost::detail::equal_range(start, finish, key); }
template <class Iterator, class Key>
static bool binary_search(Iterator start, Iterator finish, Key key, no_compare)
{ return boost::detail::binary_search(start, finish, key); }
};
template <class Sequence, class Compare>
void test_loop(Sequence& x, Compare cmp, unsigned long test_count)
{
typedef typename Sequence::const_iterator const_iterator;
for (unsigned long i = 0; i < test_count; ++i)
{
random_sorted_sequence(x);
const const_iterator start = x.begin();
const const_iterator finish = x.end();
unsigned key = random_number();
const const_iterator l = searches<Compare>::lower_bound(start, finish, key, cmp);
const const_iterator u = searches<Compare>::upper_bound(start, finish, key, cmp);
bool found_l = false;
bool found_u = false;
std::size_t index = 0;
std::size_t count = 0;
unsigned last_value = 0;
for (const_iterator p = start; p != finish; ++p)
{
if (p == l)
found_l = true;
if (p == u)
{
assert(found_l);
found_u = true;
}
unsigned value = to_int(*p);
assert(value >= last_value);
last_value = value;
if (!found_l)
{
++index;
assert(to_int(*p) < key);
}
else if (!found_u)
{
++count;
assert(to_int(*p) == key);
}
else
assert(to_int(*p) > key);
}
assert(found_l || l == finish);
assert(found_u || u == finish);
std::pair<const_iterator, const_iterator>
range = searches<Compare>::equal_range(start, finish, key, cmp);
assert(range.first == l);
assert(range.second == u);
bool found = searches<Compare>::binary_search(start, finish, key, cmp);
assert(found == (u != l));
std::cout << "found " << count << " copies of " << key << " at index " << index << "\n";
}
}
}
int main()
{
string_vector x;
std::cout << "=== testing random-access iterators with <: ===\n";
test_loop(x, no_compare(), 25);
std::cout << "=== testing random-access iterators with compare: ===\n";
test_loop(x, cmp(), 25);
std::list<mystring> y;
std::cout << "=== testing bidirectional iterators with <: ===\n";
test_loop(y, no_compare(), 25);
std::cout << "=== testing bidirectional iterators with compare: ===\n";
test_loop(y, cmp(), 25);
std::cerr << "******TEST PASSED******\n";
return 0;
}

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@ -1,489 +0,0 @@
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<meta name="GENERATOR" content="Microsoft FrontPage 4.0">
<meta name="ProgId" content="FrontPage.Editor.Document">
<title>C++ Type traits</title>
</head>
<body bgcolor="#FFFFFF" link="#0000FF" vlink="#800080">
<h2 align="center">C++ Type traits</h2>
<p align="center"><em>by John Maddock and Steve Cleary</em></p>
<p align="center"><em>This is a draft of an article that will appear in a future
issue of </em><a href="http://www.ddj.com"><em>Dr Dobb's Journal</em></a></p>
<p>Generic programming (writing code which works with any data type meeting a
set of requirements) has become the method of choice for providing reusable
code. However, there are times in generic programming when &quot;generic&quot;
just isn't good enough - sometimes the differences between types are too large
for an efficient generic implementation. This is when the traits technique
becomes important - by encapsulating those properties that need to be considered
on a type by type basis inside a traits class, we can minimise the amount of
code that has to differ from one type to another, and maximise the amount of
generic code.</p>
<p>Consider an example: when working with character strings, one common
operation is to determine the length of a null terminated string. Clearly it's
possible to write generic code that can do this, but it turns out that there are
much more efficient methods available: for example, the C library functions <font size="2" face="Courier New">strlen</font>
and <font size="2" face="Courier New">wcslen</font> are usually written in
assembler, and with suitable hardware support can be considerably faster than a
generic version written in C++. The authors of the C++ standard library realised
this, and abstracted the properties of <font size="2" face="Courier New">char</font>
and <font size="2" face="Courier New">wchar_t</font> into the class <font size="2" face="Courier New">char_traits</font>.
Generic code that works with character strings can simply use <font size="2" face="Courier New">char_traits&lt;&gt;::length</font>
to determine the length of a null terminated string, safe in the knowledge that
specialisations of <font size="2" face="Courier New">char_traits</font> will use
the most appropriate method available to them.</p>
<h4>Type traits</h4>
<p>Class <font size="2" face="Courier New">char_traits</font> is a classic
example of a collection of type specific properties wrapped up in a single class
- what Nathan Myers termed a <i>baggage class</i>[1]. In the Boost type-traits
library, we[2] have written a set of very specific traits classes, each of which
encapsulate a single trait from the C++ type system; for example, is a type a
pointer or a reference type? Or does a type have a trivial constructor, or a
const-qualifier? The type-traits classes share a unified design: each class has
a single member <i>value</i>, a compile-time constant that is true if the type
has the specified property, and false otherwise. As we will show, these classes
can be used in generic programming to determine the properties of a given type
and introduce optimisations that are appropriate for that case.</p>
<p>The type-traits library also contains a set of classes that perform a
specific transformation on a type; for example, they can remove a top-level
const or volatile qualifier from a type. Each class that performs a
transformation defines a single typedef-member <i>type</i> that is the result of
the transformation. All of the type-traits classes are defined inside namespace <font size="2" face="Courier New">boost</font>;
for brevity, namespace-qualification is omitted in most of the code samples
given.</p>
<h4>Implementation</h4>
<p>There are far too many separate classes contained in the type-traits library
to give a full implementation here - see the source code in the Boost library
for the full details - however, most of the implementation is fairly repetitive
anyway, so here we will just give you a flavour for how some of the classes are
implemented. Beginning with possibly the simplest class in the library, is_void&lt;T&gt;
has a member <i>value</i> that is true only if T is void.</p>
<pre>template &lt;typename T&gt;
struct is_void
{ static const bool value = false; };
template &lt;&gt;
struct is_void&lt;void&gt;
{ static const bool value = true; };</pre>
<p>Here we define a primary version of the template class <font size="2" face="Courier New">is_void</font>,
and provide a full-specialisation when T is void. While full specialisation of a
template class is an important technique, sometimes we need a solution that is
halfway between a fully generic solution, and a full specialisation. This is
exactly the situation for which the standards committee defined partial
template-class specialisation. As an example, consider the class
boost::is_pointer&lt;T&gt;: here we needed a primary version that handles all
the cases where T is not a pointer, and a partial specialisation to handle all
the cases where T is a pointer:</p>
<pre>template &lt;typename T&gt;
struct is_pointer
{ static const bool value = false; };
template &lt;typename T&gt;
struct is_pointer&lt;T*&gt;
{ static const bool value = true; };</pre>
<p>The syntax for partial specialisation is somewhat arcane and could easily
occupy an article in its own right; like full specialisation, in order to write
a partial specialisation for a class, you must first declare the primary
template. The partial specialisation contains an extra &lt;<EFBFBD>&gt; after the
class name that contains the partial specialisation parameters; these define the
types that will bind to that partial specialisation rather than the default
template. The rules for what can appear in a partial specialisation are somewhat
convoluted, but as a rule of thumb if you can legally write two function
overloads of the form:</p>
<pre>void foo(T);
void foo(U);</pre>
<p>Then you can also write a partial specialisation of the form:</p>
<pre>template &lt;typename T&gt;
class c{ /*details*/ };
template &lt;typename T&gt;
class c&lt;U&gt;{ /*details*/ };</pre>
<p>This rule is by no means foolproof, but it is reasonably simple to remember
and close enough to the actual rule to be useful for everyday use.</p>
<p>As a more complex example of partial specialisation consider the class
remove_bounds&lt;T&gt;. This class defines a single typedef-member <i>type</i>
that is the same type as T but with any top-level array bounds removed; this is
an example of a traits class that performs a transformation on a type:</p>
<pre>template &lt;typename T&gt;
struct remove_bounds
{ typedef T type; };
template &lt;typename T, std::size_t N&gt;
struct remove_bounds&lt;T[N]&gt;
{ typedef T type; };</pre>
<p>The aim of remove_bounds is this: imagine a generic algorithm that is passed
an array type as a template parameter, <font size="2" face="Courier New">remove_bounds</font>
provides a means of determining the underlying type of the array. For example <code>remove_bounds&lt;int[4][5]&gt;::type</code>
would evaluate to the type <code>int[5]</code>. This example also shows that the
number of template parameters in a partial specialisation does not have to match
the number in the default template. However, the number of parameters that
appear after the class name do have to match the number and type of the
parameters in the default template.</p>
<h4>Optimised copy</h4>
<p>As an example of how the type traits classes can be used, consider the
standard library algorithm copy:</p>
<pre>template&lt;typename Iter1, typename Iter2&gt;
Iter2 copy(Iter1 first, Iter1 last, Iter2 out);</pre>
<p>Obviously, there's no problem writing a generic version of copy that works
for all iterator types Iter1 and Iter2; however, there are some circumstances
when the copy operation can best be performed by a call to <font size="2" face="Courier New">memcpy</font>.
In order to implement copy in terms of <font size="2" face="Courier New">memcpy</font>
all of the following conditions need to be met:</p>
<ul>
<li>Both of the iterator types Iter1 and Iter2 must be pointers.</li>
<li>Both Iter1 and Iter2 must point to the same type - excluding <font size="2" face="Courier New">const</font>
and <font size="2" face="Courier New">volatile</font>-qualifiers.</li>
<li>The type pointed to by Iter1 must have a trivial assignment operator.</li>
</ul>
<p>By trivial assignment operator we mean that the type is either a scalar
type[3] or:</p>
<ul>
<li>The type has no user defined assignment operator.</li>
<li>The type does not have any data members that are references.</li>
<li>All base classes, and all data member objects must have trivial assignment
operators.</li>
</ul>
<p>If all these conditions are met then a type can be copied using <font size="2" face="Courier New">memcpy</font>
rather than using a compiler generated assignment operator. The type-traits
library provides a class <i>has_trivial_assign</i>, such that <code>has_trivial_assign&lt;T&gt;::value</code>
is true only if T has a trivial assignment operator. This class &quot;just
works&quot; for scalar types, but has to be explicitly specialised for
class/struct types that also happen to have a trivial assignment operator. In
other words if <i>has_trivial_assign</i> gives the wrong answer, it will give
the &quot;safe&quot; wrong answer - that trivial assignment is not allowable.</p>
<p>The code for an optimised version of copy that uses <font size="2" face="Courier New">memcpy</font>
where appropriate is given in listing 1. The code begins by defining a template
class <i>copier</i>, that takes a single Boolean template parameter, and has a
static template member function <font size="2" face="Courier New">do_copy</font>
which performs the generic version of <font size="2">copy</font> (in other words
the &quot;slow but safe version&quot;). Following that there is a specialisation
for <i>copier&lt;true&gt;</i>: again this defines a static template member
function <font size="2" face="Courier New">do_copy</font>, but this version uses
memcpy to perform an &quot;optimised&quot; copy.</p>
<p>In order to complete the implementation, what we need now is a version of
copy, that calls <code>copier&lt;true&gt;::do_copy</code> if it is safe to use <font size="2" face="Courier New">memcpy</font>,
and otherwise calls <code>copier&lt;false&gt;::do_copy</code> to do a
&quot;generic&quot; copy. This is what the version in listing 1 does. To
understand how the code works look at the code for <font size="2" face="Courier New">copy</font>
and consider first the two typedefs <i>v1_t</i> and <i>v2_t</i>. These use <code>std::iterator_traits&lt;Iter1&gt;::value_type</code>
to determine what type the two iterators point to, and then feed the result into
another type-traits class <i>remove_cv</i> that removes the top-level
const-volatile-qualifiers: this will allow copy to compare the two types without
regard to const- or volatile-qualifiers. Next, <font size="2" face="Courier New">copy</font>
declares an enumerated value <i>can_opt</i> that will become the template
parameter to copier - declaring this here as a constant is really just a
convenience - the value could be passed directly to class <font size="2" face="Courier New">copier</font>.
The value of <i>can_opt</i> is computed by verifying that all of the following
are true:</p>
<ul>
<li>first that the two iterators point to the same type by using a type-traits
class <i>is_same</i>.</li>
<li>Then that both iterators are real pointers - using the class <i>is_pointer</i>
described above.</li>
<li>Finally that the pointed-to types have a trivial assignment operator using
<i>has_trivial_assign</i>.</li>
</ul>
<p>Finally we can use the value of <i>can_opt</i> as the template argument to
copier - this version of copy will now adapt to whatever parameters are passed
to it, if its possible to use <font size="2" face="Courier New">memcpy</font>,
then it will do so, otherwise it will use a generic copy.</p>
<h4>Was it worth it?</h4>
<p>It has often been repeated in these columns that &quot;premature optimisation
is the root of all evil&quot; [4]. So the question must be asked: was our
optimisation premature? To put this in perspective the timings for our version
of copy compared a conventional generic copy[5] are shown in table 1.</p>
<p>Clearly the optimisation makes a difference in this case; but, to be fair,
the timings are loaded to exclude cache miss effects - without this accurate
comparison between algorithms becomes difficult. However, perhaps we can add a
couple of caveats to the premature optimisation rule:</p>
<ul>
<li>If you use the right algorithm for the job in the first place then
optimisation will not be required; in some cases, <font size="2" face="Courier New">memcpy</font>
is the right algorithm.</li>
<li>If a component is going to be reused in many places by many people then
optimisations may well be worthwhile where they would not be so for a single
case - in other words, the likelihood that the optimisation will be
absolutely necessary somewhere, sometime is that much higher. Just as
importantly the perceived value of the stock implementation will be higher:
there is no point standardising an algorithm if users reject it on the
grounds that there are better, more heavily optimised versions available.</li>
</ul>
<h4>Table 1: Time taken to copy 1000 elements using copy&lt;const T*, T*&gt;
(times in micro-seconds)</h4>
<table border="1" cellpadding="7" cellspacing="1" width="529">
<tr>
<td valign="top" width="33%">
<p align="center">Version</p>
</td>
<td valign="top" width="33%">
<p align="center">T</p>
</td>
<td valign="top" width="33%">
<p align="center">Time</p>
</td>
</tr>
<tr>
<td valign="top" width="33%">&quot;Optimised&quot; copy</td>
<td valign="top" width="33%">char</td>
<td valign="top" width="33%">0.99</td>
</tr>
<tr>
<td valign="top" width="33%">Conventional copy</td>
<td valign="top" width="33%">char</td>
<td valign="top" width="33%">8.07</td>
</tr>
<tr>
<td valign="top" width="33%">&quot;Optimised&quot; copy</td>
<td valign="top" width="33%">int</td>
<td valign="top" width="33%">2.52</td>
</tr>
<tr>
<td valign="top" width="33%">Conventional copy</td>
<td valign="top" width="33%">int</td>
<td valign="top" width="33%">8.02</td>
</tr>
</table>
<p>&nbsp;</p>
<h4>Pair of References</h4>
<p>The optimised copy example shows how type traits may be used to perform
optimisation decisions at compile-time. Another important usage of type traits
is to allow code to compile that otherwise would not do so unless excessive
partial specialization is used. This is possible by delegating partial
specialization to the type traits classes. Our example for this form of usage is
a pair that can hold references [6].</p>
<p>First, let us examine the definition of &quot;std::pair&quot;, omitting the
comparision operators, default constructor, and template copy constructor for
simplicity:</p>
<pre>template &lt;typename T1, typename T2&gt;
struct pair
{
typedef T1 first_type;
typedef T2 second_type;
T1 first;
T2 second;
pair(const T1 &amp; nfirst, const T2 &amp; nsecond)
:first(nfirst), second(nsecond) { }
};</pre>
<p>Now, this &quot;pair&quot; cannot hold references as it currently stands,
because the constructor would require taking a reference to a reference, which
is currently illegal [7]. Let us consider what the constructor's parameters
would have to be in order to allow &quot;pair&quot; to hold non-reference types,
references, and constant references:</p>
<table border="1" cellpadding="7" cellspacing="1" width="638">
<tr>
<td valign="top" width="50%">Type of &quot;T1&quot;</td>
<td valign="top" width="50%">Type of parameter to initializing constructor</td>
</tr>
<tr>
<td valign="top" width="50%">
<pre>T</pre>
</td>
<td valign="top" width="50%">
<pre>const T &amp;</pre>
</td>
</tr>
<tr>
<td valign="top" width="50%">
<pre>T &amp;</pre>
</td>
<td valign="top" width="50%">
<pre>T &amp;</pre>
</td>
</tr>
<tr>
<td valign="top" width="50%">
<pre>const T &amp;</pre>
</td>
<td valign="top" width="50%">
<pre>const T &amp;</pre>
</td>
</tr>
</table>
<p>A little familiarity with the type traits classes allows us to construct a
single mapping that allows us to determine the type of parameter from the type
of the contained class. The type traits classes provide a transformation &quot;add_reference&quot;,
which adds a reference to its type, unless it is already a reference.</p>
<table border="1" cellpadding="7" cellspacing="1" width="580">
<tr>
<td valign="top" width="21%">Type of &quot;T1&quot;</td>
<td valign="top" width="27%">Type of &quot;const T1&quot;</td>
<td valign="top" width="53%">Type of &quot;add_reference&lt;const
T1&gt;::type&quot;</td>
</tr>
<tr>
<td valign="top" width="21%">
<pre>T</pre>
</td>
<td valign="top" width="27%">
<pre>const T</pre>
</td>
<td valign="top" width="53%">
<pre>const T &amp;</pre>
</td>
</tr>
<tr>
<td valign="top" width="21%">
<pre>T &amp;</pre>
</td>
<td valign="top" width="27%">
<pre>T &amp; [8]</pre>
</td>
<td valign="top" width="53%">
<pre>T &amp;</pre>
</td>
</tr>
<tr>
<td valign="top" width="21%">
<pre>const T &amp;</pre>
</td>
<td valign="top" width="27%">
<pre>const T &amp;</pre>
</td>
<td valign="top" width="53%">
<pre>const T &amp;</pre>
</td>
</tr>
</table>
<p>This allows us to build a primary template definition for &quot;pair&quot;
that can contain non-reference types, reference types, and constant reference
types:</p>
<pre>template &lt;typename T1, typename T2&gt;
struct pair
{
typedef T1 first_type;
typedef T2 second_type;
T1 first;
T2 second;
pair(boost::add_reference&lt;const T1&gt;::type nfirst,
boost::add_reference&lt;const T2&gt;::type nsecond)
:first(nfirst), second(nsecond) { }
};</pre>
<p>Add back in the standard comparision operators, default constructor, and
template copy constructor (which are all the same), and you have a std::pair
that can hold reference types!</p>
<p>This same extension <i>could</i> have been done using partial template
specialization of &quot;pair&quot;, but to specialize &quot;pair&quot; in this
way would require three partial specializations, plus the primary template. Type
traits allows us to define a single primary template that adjusts itself
auto-magically to any of these partial specializations, instead of a brute-force
partial specialization approach. Using type traits in this fashion allows
programmers to delegate partial specialization to the type traits classes,
resulting in code that is easier to maintain and easier to understand.</p>
<h4>Conclusion</h4>
<p>We hope that in this article we have been able to give you some idea of what
type-traits are all about. A more complete listing of the available classes are
in the boost documentation, along with further examples using type traits.
Templates have enabled C++ uses to take the advantage of the code reuse that
generic programming brings; hopefully this article has shown that generic
programming does not have to sink to the lowest common denominator, and that
templates can be optimal as well as generic.</p>
<h4>Acknowledgements</h4>
<p>The authors would like to thank Beman Dawes and Howard Hinnant for their
helpful comments when preparing this article.</p>
<h4>References</h4>
<ol>
<li>Nathan C. Myers, C++ Report, June 1995.</li>
<li>The type traits library is based upon contributions by Steve Cleary, Beman
Dawes, Howard Hinnant and John Maddock: it can be found at www.boost.org.</li>
<li>A scalar type is an arithmetic type (i.e. a built-in integer or floating
point type), an enumeration type, a pointer, a pointer to member, or a
const- or volatile-qualified version of one of these types.</li>
<li>This quote is from Donald Knuth, ACM Computing Surveys, December 1974, pg
268.</li>
<li>The test code is available as part of the boost utility library (see
algo_opt_examples.cpp), the code was compiled with gcc 2.95 with all
optimisations turned on, tests were conducted on a 400MHz Pentium II machine
running Microsoft Windows 98.</li>
<li>John Maddock and Howard Hinnant have submitted a &quot;compressed_pair&quot;
library to Boost, which uses a technique similar to the one described here
to hold references. Their pair also uses type traits to determine if any of
the types are empty, and will derive instead of contain to conserve space --
hence the name &quot;compressed&quot;.</li>
<li>This is actually an issue with the C++ Core Language Working Group (issue
#106), submitted by Bjarne Stroustrup. The tentative resolution is to allow
a &quot;reference to a reference to T&quot; to mean the same thing as a
&quot;reference to T&quot;, but only in template instantiation, in a method
similar to multiple cv-qualifiers.</li>
<li>For those of you who are wondering why this shouldn't be const-qualified,
remember that references are always implicitly constant (for example, you
can't re-assign a reference). Remember also that &quot;const T &amp;&quot;
is something completely different. For this reason, cv-qualifiers on
template type arguments that are references are ignored.</li>
</ol>
<h2>Listing 1</h2>
<pre>namespace detail{
template &lt;bool b&gt;
struct copier
{
template&lt;typename I1, typename I2&gt;
static I2 do_copy(I1 first,
I1 last, I2 out);
};
template &lt;bool b&gt;
template&lt;typename I1, typename I2&gt;
I2 copier&lt;b&gt;::do_copy(I1 first,
I1 last,
I2 out)
{
while(first != last)
{
*out = *first;
++out;
++first;
}
return out;
}
template &lt;&gt;
struct copier&lt;true&gt;
{
template&lt;typename I1, typename I2&gt;
static I2* do_copy(I1* first, I1* last, I2* out)
{
memcpy(out, first, (last-first)*sizeof(I2));
return out+(last-first);
}
};
}
template&lt;typename I1, typename I2&gt;
inline I2 copy(I1 first, I1 last, I2 out)
{
typedef typename
boost::remove_cv&lt;
typename std::iterator_traits&lt;I1&gt;
::value_type&gt;::type v1_t;
typedef typename
boost::remove_cv&lt;
typename std::iterator_traits&lt;I2&gt;
::value_type&gt;::type v2_t;
enum{ can_opt =
boost::is_same&lt;v1_t, v2_t&gt;::value
&amp;&amp; boost::is_pointer&lt;I1&gt;::value
&amp;&amp; boost::is_pointer&lt;I2&gt;::value
&amp;&amp; boost::
has_trivial_assign&lt;v1_t&gt;::value
};
return detail::copier&lt;can_opt&gt;::
do_copy(first, last, out);
}</pre>
<hr>
<p><EFBFBD> Copyright John Maddock and Steve Cleary, 2000</p>
</body>
</html>

View File

@ -12,7 +12,7 @@ content="C:\PROGRAM FILES\MICROSOFT OFFICE\OFFICE\html.dot">
<body bgcolor="#FFFFFF" text="#000000" link="#0000FF"
vlink="#800080">
<h1><img src="../../c++boost.gif" width="276" height="86">Header
<h1><img src="../../boost.png" width="276" height="86">Header
&lt;<a href="../../boost/detail/call_traits.hpp">boost/call_traits.hpp</a>&gt;</h1>
<p>All of the contents of &lt;boost/call_traits.hpp&gt; are
@ -27,10 +27,16 @@ never occur, and that parameters are passed in the most efficient
manner possible (see <a href="#examples">examples</a>). In each
case if your existing practice is to use the type defined on the
left, then replace it with the call_traits defined type on the
right. Note that for compilers that do not support partial
specialization, no benefit will occur from using call_traits: the
call_traits defined types will always be the same as the existing
practice in this case.</p>
right. </p>
<p>Note that for compilers that do not support either partial
specialization or member templates, no benefit will occur from
using call_traits: the call_traits defined types will always be
the same as the existing practice in this case. In addition if
only member templates and not partial template specialisation is
support by the compiler (for example Visual C++ 6) then
call_traits can not be used with array types (although it can be
used to solve the reference to reference problem).</p>
<table border="0" cellpadding="7" cellspacing="1" width="797">
<tr>
@ -73,7 +79,8 @@ practice in this case.</p>
</td>
</tr>
<tr>
<td valign="top" width="17%"><p align="center">const T&amp;<br>
<td valign="top" width="17%"><p align="center">const
T&amp;<br>
(return value)</p>
</td>
<td valign="top" width="35%"><p align="center"><code>call_traits&lt;T&gt;::const_reference</code></p>
@ -85,7 +92,8 @@ practice in this case.</p>
</td>
</tr>
<tr>
<td valign="top" width="17%"><p align="center">const T&amp;<br>
<td valign="top" width="17%"><p align="center">const
T&amp;<br>
(function parameter)</p>
</td>
<td valign="top" width="35%"><p align="center"><code>call_traits&lt;T&gt;::param_type</code></p>
@ -326,8 +334,8 @@ possible:</p>
<p>The following table shows the effect that call_traits has on
various types, the table assumes that the compiler supports
partial specialization: if it doesn't then all types behave in
the same way as the entry for &quot;myclass&quot;, and call_traits
can not be used with reference or array types.</p>
the same way as the entry for &quot;myclass&quot;, and
call_traits can not be used with reference or array types.</p>
<table border="0" cellpadding="7" cellspacing="1" width="766">
<tr>
@ -382,7 +390,8 @@ can not be used with reference or array types.</p>
</td>
<td valign="top" width="17%"><p align="center">int&amp;</p>
</td>
<td valign="top" width="17%"><p align="center">const int&amp;</p>
<td valign="top" width="17%"><p align="center">const
int&amp;</p>
</td>
<td valign="top" width="17%"><p align="center">int const</p>
</td>
@ -414,7 +423,8 @@ can not be used with reference or array types.</p>
</td>
<td valign="top" width="17%"><p align="center">int&amp;</p>
</td>
<td valign="top" width="17%"><p align="center">const int&amp;</p>
<td valign="top" width="17%"><p align="center">const
int&amp;</p>
</td>
<td valign="top" width="17%"><p align="center">int&amp;</p>
</td>
@ -426,13 +436,17 @@ can not be used with reference or array types.</p>
<td valign="top" width="17%" bgcolor="#C0C0C0"><p
align="center">const int&amp;</p>
</td>
<td valign="top" width="17%"><p align="center">const int&amp;</p>
<td valign="top" width="17%"><p align="center">const
int&amp;</p>
</td>
<td valign="top" width="17%"><p align="center">const int&amp;</p>
<td valign="top" width="17%"><p align="center">const
int&amp;</p>
</td>
<td valign="top" width="17%"><p align="center">const int&amp;</p>
<td valign="top" width="17%"><p align="center">const
int&amp;</p>
</td>
<td valign="top" width="17%"><p align="center">const int&amp;</p>
<td valign="top" width="17%"><p align="center">const
int&amp;</p>
</td>
<td valign="top" width="17%"><p align="center">All
constant-references.</p>
@ -480,8 +494,8 @@ can not be used with reference or array types.</p>
<p>The following class is a trivial class that stores some type T
by value (see the <a href="call_traits_test.cpp">call_traits_test.cpp</a>
file), the aim is to illustrate how each of the available call_traits
typedefs may be used:</p>
file), the aim is to illustrate how each of the available
call_traits typedefs may be used:</p>
<pre>template &lt;class T&gt;
struct contained
@ -517,14 +531,14 @@ problem):</h4>
<pre>template &lt;class Operation&gt;
class binder1st :
public unary_function&lt;Operation::second_argument_type, Operation::result_type&gt;
public unary_function&lt;typename Operation::second_argument_type, typename Operation::result_type&gt;
{
protected:
Operation op;
Operation::first_argument_type value;
typename Operation::first_argument_type value;
public:
binder1st(const Operation&amp; x, const Operation::first_argument_type&amp; y);
Operation::result_type operator()(const Operation::second_argument_type&amp; x) const;
binder1st(const Operation&amp; x, const typename Operation::first_argument_type&amp; y);
typename Operation::result_type operator()(const typename Operation::second_argument_type&amp; x) const;
}; </pre>
<p>Now consider what happens in the relatively common case that
@ -535,7 +549,7 @@ reference to a reference as an argument, and that is not
currently legal. The solution here is to modify <code>operator()</code>
to use call_traits:</p>
<pre>Operation::result_type operator()(call_traits&lt;Operation::second_argument_type&gt;::param_type x) const;</pre>
<pre>typename Operation::result_type operator()(typename call_traits&lt;typename Operation::second_argument_type&gt;::param_type x) const;</pre>
<p>Now in the case that <code>Operation::second_argument_type</code>
is a reference type, the argument is passed as a reference, and
@ -569,14 +583,17 @@ std::pair&lt;
degraded to pointers if the deduced types are arrays, similar
situations occur in the standard binders and adapters: in
principle in any function that &quot;wraps&quot; a temporary
whose type is deduced.</p>
whose type is deduced. Note that the function arguments to
make_pair are not expressed in terms of call_traits: doing so
would prevent template argument deduction from functioning.</p>
<h4><a name="ex4"></a>Example 4 (optimising fill):</h4>
<p>The call_traits template will &quot;optimize&quot; the passing
of a small built-in type as a function parameter, this mainly has
an effect when the parameter is used within a loop body. In the
following example (see <a href="algo_opt_examples.cpp">algo_opt_examples.cpp</a>),
following example (see <a
href="../type_traits/examples/fill_example.cpp">fill_example.cpp</a>),
a version of std::fill is optimized in two ways: if the type
passed is a single byte built-in type then std::memset is used to
effect the fill, otherwise a conventional C++ implemention is
@ -589,7 +606,7 @@ template &lt;bool opt&gt;
struct filler
{
template &lt;typename I, typename T&gt;
static void do_fill(I first, I last, typename boost::call_traits&lt;T&gt;::param_type val);
static void do_fill(I first, I last, typename boost::call_traits&lt;T&gt;::param_type val)
{
while(first != last)
{
@ -632,6 +649,14 @@ Exactly how much mileage you will get from this depends upon your
compiler - we could really use some accurate benchmarking
software as part of boost for cases like this.</p>
<p>Note that the function arguments to fill are not expressed in
terms of call_traits: doing so would prevent template argument
deduction from functioning. Instead fill acts as a &quot;thin
wrapper&quot; that is there to perform template argument
deduction, the compiler will optimise away the call to fill all
together, replacing it with the call to filler&lt;&gt;::do_fill,
which does use call_traits.</p>
<h3>Rationale</h3>
<p>The following notes are intended to briefly describe the
@ -650,10 +675,10 @@ be any worse than existing practice.</p>
<p>Pointers follow the same rational as small built-in types.</p>
<p>For reference types the rational follows <a href="#refs">Example
2</a> - references to references are not allowed, so the call_traits
members must be defined such that these problems do not occur.
There is a proposal to modify the language such that &quot;a
reference to a reference is a reference&quot; (issue #106,
2</a> - references to references are not allowed, so the
call_traits members must be defined such that these problems do
not occur. There is a proposal to modify the language such that
&quot;a reference to a reference is a reference&quot; (issue #106,
submitted by Bjarne Stroustrup), call_traits&lt;T&gt;::value_type
and call_traits&lt;T&gt;::param_type both provide the same effect
as that proposal, without the need for a language change (in
@ -671,11 +696,11 @@ struct A
void foo(T t);
};</pre>
<p><font face="Times New Roman">In this case if we instantiate A&lt;int[2]&gt;
then the declared type of the parameter passed to member function
foo is int[2], but it's actual type is const int*, if we try to
use the type T within the function body, then there is a strong
likelyhood that our code will not compile:</font></p>
<p><font face="Times New Roman">In this case if we instantiate
A&lt;int[2]&gt; then the declared type of the parameter passed to
member function foo is int[2], but it's actual type is const int*,
if we try to use the type T within the function body, then there
is a strong likelyhood that our code will not compile:</font></p>
<pre>template &lt;class T&gt;
void A&lt;T&gt;::foo(T t)
@ -690,13 +715,13 @@ declared type:</p>
<pre>template &lt;class T&gt;
struct A
{
void foo(call_traits&lt;T&gt;::value_type t);
void foo(typename call_traits&lt;T&gt;::value_type t);
};
template &lt;class T&gt;
void A&lt;T&gt;::foo(call_traits&lt;T&gt;::value_type t)
void A&lt;T&gt;::foo(typename call_traits&lt;T&gt;::value_type t)
{
call_traits&lt;T&gt;::value_type dup(t); // OK even if T is an array type.
typename call_traits&lt;T&gt;::value_type dup(t); // OK even if T is an array type.
}</pre>
<p>For value_type (return by value), again only a pointer may be
@ -713,26 +738,18 @@ specialisation).</p>
<hr>
<p>Revised 18 June 2000</p>
<p>Revised 01 September 2000</p>
<p><EFBFBD> Copyright boost.org 2000. Permission to copy, use, modify,
sell and distribute this document is granted provided this
copyright notice appears in all copies. This document is provided
&quot;as is&quot; without express or implied warranty, and with
no claim as to its suitability for any purpose.</p>
<p>Based on contributions by Steve Cleary, Beman Dawes, Howard
Hinnant and John Maddock.</p>
<p>Maintained by <a href="mailto:John_Maddock@compuserve.com">John
Maddock</a>, the latest version of this file can be found at <a
href="http://www.boost.org/">www.boost.org</a>, and the boost
discussion list at <a href="http://www.egroups.com/list/boost">www.egroups.com/list/boost</a>.</p>
<p>.</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>
Copyright 2000 Steve Cleary, Beman Dawes, Howard
Hinnant and John Maddock. <br/>
Use, modification and distribution are subject to the
Boost Software License, Version 1.0.
(See accompanying file LICENSE_1_0.txt
or copy at <a href="http://www.boost.org/LICENSE_1_0.txt">
http://www.boost.org/LICENSE_1_0.txt
</a>).
</p>
</body>
</html>

View File

@ -1,20 +1,29 @@
// boost::compressed_pair test program
// boost::compressed_pair test program
// (C) Copyright John Maddock 2000. Permission to copy, use, modify, sell and
// distribute this software is granted provided this copyright notice appears
// in all copies. This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
// (C) Copyright John Maddock 2000.
// Use, modification and distribution are subject to the Boost Software License,
// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt).
// standalone test program for <boost/call_traits.hpp>
// 18 Mar 2002:
// Changed some names to prevent conflicts with some new type_traits additions.
// 03 Oct 2000:
// Enabled extra tests for VC6.
#include <cassert>
#include <iostream>
#include <iomanip>
#include <algorithm>
#include <typeinfo>
#include <boost/call_traits.hpp>
#include "type_traits_test.hpp"
#include <libs/type_traits/test/test.hpp>
#include <libs/type_traits/test/check_type.hpp>
// a way prevent warnings for unused variables
template<class T> inline void unused_variable(const T&) {}
//
// struct contained models a type that contains a type (for example std::pair)
// arrays are contained by value, and have to be treated as a special case:
@ -42,7 +51,7 @@ struct contained
reference get() { return v_; }
const_reference const_get()const { return v_; }
// pass value:
void call(param_type p){}
void call(param_type){}
};
@ -67,12 +76,12 @@ struct contained<T[N]>
// return by_ref:
reference get() { return v_; }
const_reference const_get()const { return v_; }
void call(param_type p){}
void call(param_type){}
};
#endif
template <class T>
contained<typename boost::call_traits<T>::value_type> wrap(const T& t)
contained<typename boost::call_traits<T>::value_type> test_wrap_type(const T& t)
{
typedef typename boost::call_traits<T>::value_type ct;
return contained<ct>(t);
@ -96,37 +105,38 @@ std::pair<
using namespace std;
//
// struct checker:
// struct call_traits_checker:
// verifies behaviour of contained example:
//
template <class T>
struct checker
struct call_traits_checker
{
typedef typename boost::call_traits<T>::param_type param_type;
void operator()(param_type);
};
template <class T>
void checker<T>::operator()(param_type p)
void call_traits_checker<T>::operator()(param_type p)
{
T t(p);
contained<T> c(t);
cout << "checking contained<" << typeid(T).name() << ">..." << endl;
assert(t == c.value());
assert(t == c.get());
assert(t == c.const_get());
cout << "typeof contained<" << typeid(T).name() << ">::v_ is: " << typeid(&contained<T>::v_).name() << endl;
BOOST_CHECK(t == c.value());
BOOST_CHECK(t == c.get());
BOOST_CHECK(t == c.const_get());
#ifndef __ICL
//cout << "typeof contained<" << typeid(T).name() << ">::v_ is: " << typeid(&contained<T>::v_).name() << endl;
cout << "typeof contained<" << typeid(T).name() << ">::value() is: " << typeid(&contained<T>::value).name() << endl;
cout << "typeof contained<" << typeid(T).name() << ">::get() is: " << typeid(&contained<T>::get).name() << endl;
cout << "typeof contained<" << typeid(T).name() << ">::const_get() is: " << typeid(&contained<T>::const_get).name() << endl;
cout << "typeof contained<" << typeid(T).name() << ">::call() is: " << typeid(&contained<T>::call).name() << endl;
cout << endl;
#endif
}
#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
template <class T, std::size_t N>
struct checker<T[N]>
struct call_traits_checker<T[N]>
{
typedef typename boost::call_traits<T[N]>::param_type param_type;
void operator()(param_type t)
@ -135,11 +145,11 @@ struct checker<T[N]>
cout << "checking contained<" << typeid(T[N]).name() << ">..." << endl;
unsigned int i = 0;
for(i = 0; i < N; ++i)
assert(t[i] == c.value()[i]);
BOOST_CHECK(t[i] == c.value()[i]);
for(i = 0; i < N; ++i)
assert(t[i] == c.get()[i]);
BOOST_CHECK(t[i] == c.get()[i]);
for(i = 0; i < N; ++i)
assert(t[i] == c.const_get()[i]);
BOOST_CHECK(t[i] == c.const_get()[i]);
cout << "typeof contained<" << typeid(T[N]).name() << ">::v_ is: " << typeid(&contained<T[N]>::v_).name() << endl;
cout << "typeof contained<" << typeid(T[N]).name() << ">::value is: " << typeid(&contained<T[N]>::value).name() << endl;
@ -153,11 +163,11 @@ struct checker<T[N]>
//
// check_wrap:
template <class T, class U>
void check_wrap(const contained<T>& w, const U& u)
template <class W, class U>
void check_wrap(const W& w, const U& u)
{
cout << "checking contained<" << typeid(T).name() << ">..." << endl;
assert(w.value() == u);
cout << "checking " << typeid(W).name() << "..." << endl;
BOOST_CHECK(w.value() == u);
}
//
@ -168,47 +178,51 @@ template <class T, class U, class V>
void check_make_pair(T c, U u, V v)
{
cout << "checking std::pair<" << typeid(c.first).name() << ", " << typeid(c.second).name() << ">..." << endl;
assert(c.first == u);
assert(c.second == v);
BOOST_CHECK(c.first == u);
BOOST_CHECK(c.second == v);
cout << endl;
}
struct UDT
struct comparible_UDT
{
int i_;
UDT() : i_(2){}
bool operator == (const UDT& v){ return v.i_ == i_; }
comparible_UDT() : i_(2){}
comparible_UDT(const comparible_UDT& other) : i_(other.i_){}
comparible_UDT& operator=(const comparible_UDT& other)
{
i_ = other.i_;
return *this;
}
bool operator == (const comparible_UDT& v){ return v.i_ == i_; }
};
int main()
int main(int argc, char *argv[ ])
{
checker<UDT> c1;
UDT u;
call_traits_checker<comparible_UDT> c1;
comparible_UDT u;
c1(u);
checker<int> c2;
call_traits_checker<int> c2;
int i = 2;
c2(i);
int* pi = &i;
checker<int*> c3;
c3(pi);
#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
checker<int&> c4;
c4(i);
checker<const int&> c5;
c5(i);
int a[2] = {1,2};
checker<int[2]> c6;
#if defined(BOOST_MSVC6_MEMBER_TEMPLATES) && !defined(__ICL)
call_traits_checker<int*> c3;
c3(pi);
call_traits_checker<int&> c4;
c4(i);
call_traits_checker<const int&> c5;
c5(i);
#if !defined (BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) && !defined(__MWERKS__) && !defined(__SUNPRO_CC)
call_traits_checker<int[2]> c6;
c6(a);
#endif
#endif
check_wrap(wrap(2), 2);
const char ca[4] = "abc";
// compiler can't deduce this for some reason:
//check_wrap(wrap(ca), ca);
#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
check_wrap(wrap(a), a);
check_wrap(test_wrap_type(2), 2);
#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) && !defined(__SUNPRO_CC)
check_wrap(test_wrap_type(a), a);
check_make_pair(test::make_pair(a, a), a, a);
#endif
@ -217,59 +231,67 @@ int main()
typedef int& r_type;
typedef const r_type cr_type;
type_test(UDT, boost::call_traits<UDT>::value_type)
type_test(UDT&, boost::call_traits<UDT>::reference)
type_test(const UDT&, boost::call_traits<UDT>::const_reference)
type_test(const UDT&, boost::call_traits<UDT>::param_type)
type_test(int, boost::call_traits<int>::value_type)
type_test(int&, boost::call_traits<int>::reference)
type_test(const int&, boost::call_traits<int>::const_reference)
type_test(const int, boost::call_traits<int>::param_type)
type_test(int*, boost::call_traits<int*>::value_type)
type_test(int*&, boost::call_traits<int*>::reference)
type_test(int*const&, boost::call_traits<int*>::const_reference)
type_test(int*const, boost::call_traits<int*>::param_type)
#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
type_test(int&, boost::call_traits<int&>::value_type)
type_test(int&, boost::call_traits<int&>::reference)
type_test(const int&, boost::call_traits<int&>::const_reference)
type_test(int&, boost::call_traits<int&>::param_type)
#if !(defined(__GNUC__) && (__GNUC__ < 3))
type_test(int&, boost::call_traits<cr_type>::value_type)
type_test(int&, boost::call_traits<cr_type>::reference)
type_test(const int&, boost::call_traits<cr_type>::const_reference)
type_test(int&, boost::call_traits<cr_type>::param_type)
BOOST_CHECK_TYPE(comparible_UDT, boost::call_traits<comparible_UDT>::value_type);
BOOST_CHECK_TYPE(comparible_UDT&, boost::call_traits<comparible_UDT>::reference);
BOOST_CHECK_TYPE(const comparible_UDT&, boost::call_traits<comparible_UDT>::const_reference);
BOOST_CHECK_TYPE(const comparible_UDT&, boost::call_traits<comparible_UDT>::param_type);
BOOST_CHECK_TYPE(int, boost::call_traits<int>::value_type);
BOOST_CHECK_TYPE(int&, boost::call_traits<int>::reference);
BOOST_CHECK_TYPE(const int&, boost::call_traits<int>::const_reference);
BOOST_CHECK_TYPE(const int, boost::call_traits<int>::param_type);
BOOST_CHECK_TYPE(int*, boost::call_traits<int*>::value_type);
BOOST_CHECK_TYPE(int*&, boost::call_traits<int*>::reference);
BOOST_CHECK_TYPE(int*const&, boost::call_traits<int*>::const_reference);
BOOST_CHECK_TYPE(int*const, boost::call_traits<int*>::param_type);
#if defined(BOOST_MSVC6_MEMBER_TEMPLATES)
BOOST_CHECK_TYPE(int&, boost::call_traits<int&>::value_type);
BOOST_CHECK_TYPE(int&, boost::call_traits<int&>::reference);
BOOST_CHECK_TYPE(const int&, boost::call_traits<int&>::const_reference);
BOOST_CHECK_TYPE(int&, boost::call_traits<int&>::param_type);
#if !(defined(__GNUC__) && ((__GNUC__ < 3) || (__GNUC__ == 3) && (__GNUC_MINOR__ < 1)))
BOOST_CHECK_TYPE(int&, boost::call_traits<cr_type>::value_type);
BOOST_CHECK_TYPE(int&, boost::call_traits<cr_type>::reference);
BOOST_CHECK_TYPE(const int&, boost::call_traits<cr_type>::const_reference);
BOOST_CHECK_TYPE(int&, boost::call_traits<cr_type>::param_type);
#else
std::cout << "Your compiler cannot instantiate call_traits<int&const>, skipping four tests (4 errors)" << std::endl;
failures += 4;
test_count += 4;
#endif
type_test(const int&, boost::call_traits<const int&>::value_type)
type_test(const int&, boost::call_traits<const int&>::reference)
type_test(const int&, boost::call_traits<const int&>::const_reference)
type_test(const int&, boost::call_traits<const int&>::param_type)
type_test(const int*, boost::call_traits<int[3]>::value_type)
type_test(int(&)[3], boost::call_traits<int[3]>::reference)
type_test(const int(&)[3], boost::call_traits<int[3]>::const_reference)
type_test(const int*const, boost::call_traits<int[3]>::param_type)
type_test(const int*, boost::call_traits<const int[3]>::value_type)
type_test(const int(&)[3], boost::call_traits<const int[3]>::reference)
type_test(const int(&)[3], boost::call_traits<const int[3]>::const_reference)
type_test(const int*const, boost::call_traits<const int[3]>::param_type)
BOOST_CHECK_TYPE(const int&, boost::call_traits<const int&>::value_type);
BOOST_CHECK_TYPE(const int&, boost::call_traits<const int&>::reference);
BOOST_CHECK_TYPE(const int&, boost::call_traits<const int&>::const_reference);
BOOST_CHECK_TYPE(const int&, boost::call_traits<const int&>::param_type);
#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
BOOST_CHECK_TYPE(const int*, boost::call_traits<int[3]>::value_type);
BOOST_CHECK_TYPE(int(&)[3], boost::call_traits<int[3]>::reference);
BOOST_CHECK_TYPE(const int(&)[3], boost::call_traits<int[3]>::const_reference);
BOOST_CHECK_TYPE(const int*const, boost::call_traits<int[3]>::param_type);
BOOST_CHECK_TYPE(const int*, boost::call_traits<const int[3]>::value_type);
BOOST_CHECK_TYPE(const int(&)[3], boost::call_traits<const int[3]>::reference);
BOOST_CHECK_TYPE(const int(&)[3], boost::call_traits<const int[3]>::const_reference);
BOOST_CHECK_TYPE(const int*const, boost::call_traits<const int[3]>::param_type);
// test with abstract base class:
BOOST_CHECK_TYPE(test_abc1, boost::call_traits<test_abc1>::value_type);
BOOST_CHECK_TYPE(test_abc1&, boost::call_traits<test_abc1>::reference);
BOOST_CHECK_TYPE(const test_abc1&, boost::call_traits<test_abc1>::const_reference);
BOOST_CHECK_TYPE(const test_abc1&, boost::call_traits<test_abc1>::param_type);
#else
std::cout << "You're compiler does not support partial template instantiation, skipping 20 tests (20 errors)" << std::endl;
failures += 20;
test_count += 20;
std::cout << "You're compiler does not support partial template specialiation, skipping 8 tests (8 errors)" << std::endl;
#endif
#else
std::cout << "You're compiler does not support partial template specialiation, skipping 20 tests (20 errors)" << std::endl;
#endif
// test with an incomplete type:
BOOST_CHECK_TYPE(incomplete_type, boost::call_traits<incomplete_type>::value_type);
BOOST_CHECK_TYPE(incomplete_type&, boost::call_traits<incomplete_type>::reference);
BOOST_CHECK_TYPE(const incomplete_type&, boost::call_traits<incomplete_type>::const_reference);
BOOST_CHECK_TYPE(const incomplete_type&, boost::call_traits<incomplete_type>::param_type);
std::cout << std::endl << test_count << " tests completed (" << failures << " failures)... press any key to exit";
std::cin.get();
return failures;
return 0;
}
//
// define call_traits tests to check that the assertions in the docs do actually work
// this is an instantiate only set of tests:
// this is an compile-time only set of tests:
//
template <typename T, bool isarray = false>
struct call_traits_test
@ -304,6 +326,19 @@ void call_traits_test<T, isarray>::assert_construct(typename call_traits_test<T,
param_type p2(v);
param_type p3(r);
param_type p4(p);
unused_variable(v2);
unused_variable(v3);
unused_variable(v4);
unused_variable(r2);
unused_variable(r3);
unused_variable(cr2);
unused_variable(cr3);
unused_variable(cr4);
unused_variable(cr5);
unused_variable(p2);
unused_variable(p3);
unused_variable(p4);
}
#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
template <typename T>
@ -318,7 +353,7 @@ struct call_traits_test<T, true>
};
template <typename T>
void call_traits_test<T, true>::assert_construct(boost::call_traits<T>::param_type val)
void call_traits_test<T, true>::assert_construct(typename boost::call_traits<T>::param_type val)
{
//
// this is to check that the call_traits assertions are valid:
@ -340,6 +375,19 @@ void call_traits_test<T, true>::assert_construct(boost::call_traits<T>::param_ty
param_type p2(v);
param_type p3(r);
param_type p4(p);
unused_variable(v2);
unused_variable(v3);
unused_variable(v4);
unused_variable(v5);
#ifndef __BORLANDC__
unused_variable(r2);
unused_variable(cr2);
#endif
unused_variable(cr3);
unused_variable(p2);
unused_variable(p3);
unused_variable(p4);
}
#endif //BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
//
@ -347,9 +395,11 @@ void call_traits_test<T, true>::assert_construct(boost::call_traits<T>::param_ty
template struct call_traits_test<int>;
template struct call_traits_test<const int>;
template struct call_traits_test<int*>;
#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
#if defined(BOOST_MSVC6_MEMBER_TEMPLATES)
template struct call_traits_test<int&>;
template struct call_traits_test<const int&>;
#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) && !defined(__SUNPRO_CC)
template struct call_traits_test<int[2], true>;
#endif
#endif

148
cast.htm
View File

@ -1,148 +0,0 @@
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
<meta name="GENERATOR" content="Microsoft FrontPage 4.0">
<meta name="ProgId" content="FrontPage.Editor.Document">
<title>Header boost/cast.hpp Documentation</title>
</head>
<body bgcolor="#FFFFFF" text="#000000">
<h1><img src="../../c++boost.gif" alt="c++boost.gif (8819 bytes)" align="center" width="277" height="86">Header
<a href="../../boost/cast.hpp">boost/cast.hpp</a></h1>
<h2><a name="Cast Functions">Cast Functions</a></h2>
<p>The <code>header <a href="../../boost/cast.hpp">boost/cast.hpp</a></code>
provides <a href="#Polymorphic_cast"><b>polymorphic_cast</b></a>, <a href="#Polymorphic_cast"><b>polymorphic_downcast</b></a>,
and <a href="#numeric_cast"><b>numeric_cast</b></a> template functions designed
to complement the C++ Standard's built-in casts.</p>
<p>The program&nbsp;<a href="cast_test.cpp">cast_test.cpp</a> can be used to
verify these function templates work as expected.</p>
<p><b>polymorphic_cast</b> was suggested by Bjarne Stroustrup in &quot;The C++
Programming Language&quot;.<br>
<b>polymorphic_downcast</b> was contributed by <a href="../../people/dave_abrahams.htm">Dave
Abrahams</a>.<b><br>
numeric_cast</b> was contributed by <a href="../../people/kevlin_henney.htm">Kevlin
Henney</a>.</p>
<h3>Namespace synopsis</h3>
<blockquote>
<pre>namespace boost {
namespace cast {
// all synopsis below included here
}
using ::boost::cast::polymorphic_cast;
using ::boost::cast::polymorphic_downcast;
using ::boost::cast::bad_numeric_cast;
using ::boost::cast::numeric_cast;
}</pre>
</blockquote>
<h3><a name="Polymorphic_cast">Polymorphic casts</a></h3>
<p>Pointers to polymorphic objects (objects of classes which define at least one
virtual function) are sometimes downcast or crosscast.&nbsp; Downcasting means
casting from a base class to a derived class.&nbsp; Crosscasting means casting
across an inheritance hierarchy diagram, such as from one base to the other in a
<b>Y</b> diagram hierarchy.</p>
<p>Such casts can be done with old-style casts, but this approach is never to be
recommended.&nbsp; Old-style casts are sorely lacking in type safety, suffer
poor readability, and are difficult to locate with search tools.</p>
<p>The C++ built-in <b>static_cast</b> can be used for efficiently downcasting
pointers to polymorphic objects, but provides no error detection for the case
where the pointer being cast actually points to the wrong derived class. The <b>polymorphic_downcast</b>
template retains the efficiency of <b>static_cast</b> for non-debug
compilations, but for debug compilations adds safety via an assert() that a <b>dynamic_cast</b>
succeeds.&nbsp;<b>&nbsp;</b></p>
<p>The C++ built-in <b>dynamic_cast</b> can be used for downcasts and crosscasts
of pointers to polymorphic objects, but error notification in the form of a
returned value of 0 is inconvenient to test, or worse yet, easy to forget to
test.&nbsp; The <b>polymorphic_cast</b> template performs a <b>dynamic_cast</b>,
and throws an exception if the <b>dynamic_cast</b> returns 0.</p>
<p>A <b>polymorphic_downcast</b> is preferred when debug-mode tests will cover
100% of the object types possibly cast and when non-debug-mode efficiency is an
issue. If these two conditions are not present, <b>polymorphic_cast</b> is
preferred.&nbsp; It must also be used for crosscasts.&nbsp; It does an assert(
dynamic_cast&lt;Derived&gt;(x) == x ) where x is the base pointer, ensuring that
not only is a non-zero pointer returned, but also that it correct in the
presence of multiple inheritance. .<b> Warning:</b>: Because <b>polymorphic_downcast</b>
uses assert(), it violates the One Definition Rule if NDEBUG is inconsistently
defined across translation units.</p>
<p>The C++ built-in <b>dynamic_cast</b> must be used to cast references rather
than pointers.&nbsp; It is also the only cast that can be used to check whether
a given interface is supported; in that case a return of 0 isn't an error
condition.</p>
<h3>polymorphic_cast and polymorphic_downcast synopsis</h3>
<blockquote>
<pre>template &lt;class Derived, class Base&gt;
inline Derived polymorphic_cast(Base* x);
// Throws: std::bad_cast if ( dynamic_cast&lt;Derived&gt;(x) == 0 )
// Returns: dynamic_cast&lt;Derived&gt;(x)
template &lt;class Derived, class Base&gt;
inline Derived polymorphic_downcast(Base* x);
// Effects: assert( dynamic_cast&lt;Derived&gt;(x) == x );
// Returns: static_cast&lt;Derived&gt;(x)</pre>
</blockquote>
<h3>polymorphic_downcast example</h3>
<blockquote>
<pre>#include &lt;boost/cast.hpp&gt;
...
class Fruit { public: virtual ~Fruit(){}; ... };
class Banana : public Fruit { ... };
...
void f( Fruit * fruit ) {
// ... logic which leads us to believe it is a Banana
Banana * banana = boost::polymorphic_downcast&lt;Banana*&gt;(fruit);
...</pre>
</blockquote>
<h3><a name="numeric_cast">numeric_cast</a></h3>
<p>A <b>static_cast</b>, <b>implicit_cast</b> or implicit conversion will not
detect failure to preserve range for numeric casts. The <b>numeric_cast</b>
template function are similar to <b>static_cast</b> and certain (dubious)
implicit conversions in this respect, except that they detect loss of numeric
range. An exception is thrown when a runtime value preservation check fails.</p>
<p>The requirements on the argument and result types are:</p>
<blockquote>
<ul>
<li>Both argument and result types are CopyConstructible [20.1.3].</li>
<li>Both argument and result types are Numeric, defined by <code>std::numeric_limits&lt;&gt;::is_specialized</code>
being true.</li>
<li>The argument can be converted to the result type using <b>static_cast</b>.</li>
</ul>
</blockquote>
<h3>numeric_cast synopsis</h3>
<blockquote>
<pre>class bad_numeric_cast : public std::bad_cast {...};
template&lt;typename Target, typename Source&gt;
inline Target numeric_cast(Source arg);
// Throws: bad_numeric_cast unless, in converting arg from Source to Target,
// there is no loss of negative range, and no underflow, and no
// overflow, as determined by std::numeric_limits
// Returns: static_cast&lt;Target&gt;(arg)</pre>
</blockquote>
<h3>numeric_cast example</h3>
<blockquote>
<pre>#include &lt;boost/cast.hpp&gt;
using namespace boost::cast;
void ariane(double vx)
{
...
unsigned short dx = numeric_cast&lt;unsigned short&gt;(vx);
...
}</pre>
</blockquote>
<h3>numeric_cast rationale</h3>
<p>The form of the throws condition is specified so that != is not a required
operation.</p>
<hr>
<p>Revised&nbsp; <!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %B, %Y" startspan
-->28 June, 2000<!--webbot bot="Timestamp" endspan i-checksum="19846"
--></p>
<p><EFBFBD> Copyright boost.org 1999. Permission to copy, use, modify, sell and
distribute this document is granted provided this copyright notice appears in
all copies. This document is provided &quot;as is&quot; without express or
implied warranty, and with no claim as to its suitability for any purpose.</p>
</body>
</html>

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@ -1,149 +0,0 @@
// boost utility cast test program -----------------------------------------//
// (C) Copyright boost.org 1999. Permission to copy, use, modify, sell
// and distribute this software is granted provided this copyright
// notice appears in all copies. This software is provided "as is" without
// express or implied warranty, and with no claim as to its suitability for
// any purpose.
// See http://www.boost.org for most recent version including documentation.
// Revision History
// 28 Jun 00 implicit_cast removed (Beman Dawes)
// 30 Aug 99 value_cast replaced by numeric_cast
// 3 Aug 99 Initial Version
#include <iostream>
#include <climits>
#include <limits>
#include <boost/cast.hpp>
# if SCHAR_MAX == LONG_MAX
# error "This test program doesn't work if SCHAR_MAX == LONG_MAX"
# endif
using namespace boost;
using std::cout;
namespace
{
struct Base
{
virtual char kind() { return 'B'; }
};
struct Base2
{
virtual char kind2() { return '2'; }
};
struct Derived : public Base, Base2
{
virtual char kind() { return 'D'; }
};
}
int main( int argc, char * argv[] )
{
cout << "Usage: test_casts [n], where n omitted or is:\n"
" 1 = execute #1 assert failure (#ifndef NDEBUG)\n"
" 2 = execute #2 assert failure (#ifndef NDEBUG)\n"
"Example: test_casts 2\n\n";
# ifdef NDEBUG
cout << "NDEBUG is defined\n";
# else
cout << "NDEBUG is not defined\n";
# endif
cout << "\nBeginning tests...\n";
// test polymorphic_cast ---------------------------------------------------//
// tests which should succeed
Base * base = new Derived;
Base2 * base2 = 0;
Derived * derived = 0;
derived = polymorphic_downcast<Derived*>( base ); // downcast
assert( derived->kind() == 'D' );
derived = 0;
derived = polymorphic_cast<Derived*>( base ); // downcast, throw on error
assert( derived->kind() == 'D' );
base2 = polymorphic_cast<Base2*>( base ); // crosscast
assert( base2->kind2() == '2' );
// tests which should result in errors being detected
int err_count = 0;
base = new Base;
if ( argc > 1 && *argv[1] == '1' )
{ derived = polymorphic_downcast<Derived*>( base ); } // #1 assert failure
bool caught_exception = false;
try { derived = polymorphic_cast<Derived*>( base ); }
catch (std::bad_cast)
{ cout<<"caught bad_cast\n"; caught_exception = true; }
if ( !caught_exception ) ++err_count;
// the following is just so generated code can be inspected
if ( derived->kind() == 'B' ) ++err_count;
// test implicit_cast and numeric_cast -------------------------------------//
// tests which should succeed
long small_value = 1;
long small_negative_value = -1;
long large_value = std::numeric_limits<long>::max();
long large_negative_value = std::numeric_limits<long>::min();
signed char c = 0;
c = large_value; // see if compiler generates warning
c = numeric_cast<signed char>( small_value );
assert( c == 1 );
c = 0;
c = numeric_cast<signed char>( small_value );
assert( c == 1 );
c = 0;
c = numeric_cast<signed char>( small_negative_value );
assert( c == -1 );
// tests which should result in errors being detected
caught_exception = false;
try { c = numeric_cast<signed char>( large_value ); }
catch (bad_numeric_cast)
{ cout<<"caught bad_numeric_cast #1\n"; caught_exception = true; }
if ( !caught_exception ) ++err_count;
caught_exception = false;
try { c = numeric_cast<signed char>( large_negative_value ); }
catch (bad_numeric_cast)
{ cout<<"caught bad_numeric_cast #2\n"; caught_exception = true; }
if ( !caught_exception ) ++err_count;
unsigned long ul;
caught_exception = false;
try { ul = numeric_cast<unsigned long>( large_negative_value ); }
catch (bad_numeric_cast)
{ cout<<"caught bad_numeric_cast #3\n"; caught_exception = true; }
if ( !caught_exception ) ++err_count;
caught_exception = false;
try { ul = numeric_cast<unsigned long>( small_negative_value ); }
catch (bad_numeric_cast)
{ cout<<"caught bad_numeric_cast #4\n"; caught_exception = true; }
if ( !caught_exception ) ++err_count;
caught_exception = false;
try { numeric_cast<int>( std::numeric_limits<double>::max() ); }
catch (bad_numeric_cast)
{ cout<<"caught bad_numeric_cast #5\n"; caught_exception = true; }
if ( !caught_exception ) ++err_count;
cout << err_count << " errors detected\nTest "
<< (err_count==0 ? "passed\n" : "failed\n");
return err_count;
} // main

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title>Boost: checked_delete.hpp documentation</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>
<body bgcolor="white" style="MARGIN-LEFT: 5%; MARGIN-RIGHT: 5%">
<table border="0" width="100%">
<tr>
<td width="277"><A href="../../index.htm"> <img src="../../boost.png" alt="boost.png (6897 bytes)" width="277" height="86" border="0"></A>
</td>
<td align="center">
<h1>checked_delete.hpp</h1>
</td>
</tr>
<tr>
<td colspan="2" height="64">&nbsp;</td>
</tr>
</table>
<p>
The header <STRONG>&lt;boost/checked_delete.hpp&gt;</STRONG> defines two
function templates, <STRONG>checked_delete</STRONG> and <STRONG>checked_array_delete</STRONG>,
and two class templates, <STRONG>checked_deleter</STRONG> and <STRONG>checked_array_deleter</STRONG>.
</p>
<P>The C++ Standard allows, in 5.3.5/5, pointers to incomplete class types to be
deleted with a <EM>delete-expression</EM>. When the class has a non-trivial
destructor, or a class-specific operator delete, the behavior is undefined.
Some compilers issue a warning when an incomplete type is deleted, but
unfortunately, not all do, and programmers sometimes ignore or disable
warnings.</P>
<P>A particularly troublesome case is when a smart pointer's destructor, such as <STRONG>
boost::scoped_ptr&lt;T&gt;::~scoped_ptr</STRONG>, is instantiated with an
incomplete type. This can often lead to silent, hard to track failures.</P>
<P>The supplied function and class templates can be used to prevent these problems,
as they require a complete type, and cause a compilation error otherwise.</P>
<h3><a name="Synopsis">Synopsis</a></h3>
<pre>
namespace boost
{
template&lt;class T&gt; void checked_delete(T * p);
template&lt;class T&gt; void checked_array_delete(T * p);
template&lt;class T&gt; struct checked_deleter;
template&lt;class T&gt; struct checked_array_deleter;
}
</pre>
<h3>checked_delete</h3>
<h4><a name="checked_delete">template&lt;class T&gt; void checked_delete(T * p);</a></h4>
<blockquote>
<p>
<b>Requires:</b> <b>T</b> must be a complete type. The expression <tt>delete p</tt>
must be well-formed.
</p>
<p>
<b>Effects:</b> <tt>delete p;</tt>
</p>
</blockquote>
<h3>checked_array_delete</h3>
<h4><a name="checked_array_delete">template&lt;class T&gt; void checked_array_delete(T
* p);</a></h4>
<blockquote>
<p>
<b>Requires:</b> <b>T</b> must be a complete type. The expression <tt>delete [] p</tt>
must be well-formed.
</p>
<p>
<b>Effects:</b> <tt>delete [] p;</tt>
</p>
</blockquote>
<h3>checked_deleter</h3>
<pre>
template&lt;class T&gt; struct checked_deleter
{
typedef void result_type;
typedef T * argument_type;
void operator()(T * p) const;
};
</pre>
<h4>void checked_deleter&lt;T&gt;::operator()(T * p) const;</h4>
<blockquote>
<p>
<b>Requires:</b> <b>T</b> must be a complete type. The expression <tt>delete p</tt>
must be well-formed.
</p>
<p>
<b>Effects:</b> <tt>delete p;</tt>
</p>
</blockquote>
<h3>checked_array_deleter</h3>
<pre>
template&lt;class T&gt; struct checked_array_deleter
{
typedef void result_type;
typedef T * argument_type;
void operator()(T * p) const;
};
</pre>
<h4>void checked_array_deleter&lt;T&gt;::operator()(T * p) const;</h4>
<blockquote>
<p>
<b>Requires:</b> <b>T</b> must be a complete type. The expression <tt>delete [] p</tt>
must be well-formed.
</p>
<p>
<b>Effects:</b> <tt>delete [] p;</tt>
</p>
</blockquote>
<h3><a name="Acknowledgements">Acknowledgements</a></h3>
<p>
The function templates <STRONG>checked_delete</STRONG> and <STRONG>checked_array_delete</STRONG>
were originally part of <STRONG>&lt;boost/utility.hpp&gt;</STRONG>, and the
documentation acknowledged Beman Dawes, Dave Abrahams, Vladimir Prus, Rainer
Deyke, John Maddock, and others as contributors.
</p>
<p>
<br>
<small>Copyright <20> 2002 by Peter Dimov. Distributed under the Boost Software License, Version
1.0. See accompanying file <A href="../../LICENSE_1_0.txt">LICENSE_1_0.txt</A> or
copy at <A href="http://www.boost.org/LICENSE_1_0.txt">http://www.boost.org/LICENSE_1_0.txt</A>.</small></p>
</body>
</html>

28
checked_delete_test.cpp Normal file
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@ -0,0 +1,28 @@
// Boost checked_delete test program ---------------------------------------//
// Copyright Beman Dawes 2001. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
// See http://www.boost.org/libs/utility for documentation.
// Revision History
// 21 May 01 Initial version (Beman Dawes)
#include <boost/checked_delete.hpp> // for checked_delete
// This program demonstrates compiler errors when trying to delete an
// incomplete type.
namespace
{
class Incomplete;
}
int main()
{
Incomplete * p = 0;
boost::checked_delete(p); // should cause compile time error
boost::checked_array_delete(p); // should cause compile time error
return 0;
} // main

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@ -1,29 +1,19 @@
<html>
<head>
<meta http-equiv="Content-Type"
content="text/html; charset=iso-8859-1">
<meta name="Template"
content="C:\PROGRAM FILES\MICROSOFT OFFICE\OFFICE\html.dot">
<meta name="GENERATOR" content="Microsoft FrontPage Express 2.0">
<title>Header <boost/compressed_pair.hpp></title>
</head>
<body bgcolor="#FFFFFF" text="#000000" link="#0000FF"
vlink="#800080">
<h2><img src="../../c++boost.gif" width="276" height="86">Header
&lt;<a href="../../boost/detail/call_traits.hpp">boost/compressed_pair.hpp</a>&gt;</h2>
<p>All of the contents of &lt;boost/compressed_pair.hpp&gt; are
defined inside namespace boost.</p>
<p>The class compressed pair is very similar to std::pair, but if
either of the template arguments are empty classes, then the
&quot;empty member optimisation&quot; is applied to compress the
size of the pair.</p>
<pre>template &lt;class T1, class T2&gt;
<head>
<title>Header </title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<meta name="Template" content="C:\PROGRAM FILES\MICROSOFT OFFICE\OFFICE\html.dot">
<meta name="GENERATOR" content="Microsoft FrontPage 5.0">
<boostcompressed_pair.hpp>
</head>
<body bgcolor="#ffffff" text="#000000" link="#0000ff" vlink="#800080">
<h2><img src="../../boost.png" width="276" height="86">Header &lt;<a href="../../boost/detail/compressed_pair.hpp">boost/compressed_pair.hpp</a>&gt;</h2>
<p>All of the contents of &lt;boost/compressed_pair.hpp&gt; are defined inside
namespace boost.</p>
<p>The class compressed pair is very similar to std::pair, but if either of the
template arguments are empty classes, then the "empty base-class optimisation"
is applied to compress the size of the pair.</p>
<pre>template &lt;class T1, class T2&gt;
class compressed_pair
{
public:
@ -41,6 +31,8 @@ public:
explicit compressed_pair(first_param_type x);
explicit compressed_pair(second_param_type y);
compressed_pair&amp; operator=(const compressed_pair&amp;);
first_reference first();
first_const_reference first() const;
@ -49,44 +41,36 @@ public:
void swap(compressed_pair&amp; y);
};</pre>
<p>The two members of the pair can be accessed using the member functions first()
and second(). Note that not all member functions can be instantiated for all
template parameter types. In particular compressed_pair can be instantiated for
reference and array types, however in these cases the range of constructors
that can be used are limited. If types T1 and T2 are the same type, then there
is only one version of the single-argument constructor, and this constructor
initialises both values in the pair to the passed value.</p>
<P>Note that if either member is a POD type, then that member is not
zero-initialized by the compressed_pair default constructor: it's up to you to
supply an initial value for these types if you want them to have a default
value.</P>
<p>Note that compressed_pair can not be instantiated if either of the template
arguments is a union type, unless there is compiler support for
boost::is_union, or if boost::is_union is specialised for the union type.</p>
<p>Finally, a word of caution for Visual C++ 6 users: if either argument is an
empty type, then assigning to that member will produce memory corruption,
unless the empty type has a "do nothing" assignment operator defined. This is
due to a bug in the way VC6 generates implicit assignment operators.</p>
<h3>Acknowledgements</h3>
<p>Based on contributions by Steve Cleary, Beman Dawes, Howard Hinnant and John
Maddock.</p>
<p>Maintained by <a href="mailto:john@johnmaddock.co.uk">John Maddock</a>, the
latest version of this file can be found at <a href="http://www.boost.org">www.boost.org</a>,
and the boost discussion list at <a href="http://www.yahoogroups.com/list/boost">www.yahoogroups.com/list/boost</a>.</p>
<hr>
<p>Revised
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B %Y" startspan -->07 November 2007<!--webbot bot="Timestamp" endspan i-checksum="40338" --></p>
<p><EFBFBD> Copyright Beman Dawes, 2000.</p>
<p>Distributed under the Boost Software License, Version 1.0. See
<a href="http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a></p>
<p>The two members of the pair can be accessed using the member
functions first() and second(). Note that not all member
functions can be instantiated for all template parameter types.
In particular compressed_pair can be instantiated for reference
and array types, however in these cases the range of constructors
that can be used are limited. If types T1 and T2 are the same
type, then there is only one version of the single-argument
constructor, and this constructor initialises both values in the
pair to the passed value.</p>
<p>Note that compressed_pair can not be instantiated if either of
the template arguments is an enumerator type, unless there is
compiler support for boost::is_enum, or if boost::is_enum is
specialised for the enumerator type.</p>
<p>Finally, compressed_pair requires compiler support for partial
specialisation of class templates - without that support
compressed_pair behaves just like std::pair.</p>
<hr>
<p>Revised 08 March 2000</p>
<p><EFBFBD> Copyright boost.org 2000. Permission to copy, use, modify,
sell and distribute this document is granted provided this
copyright notice appears in all copies. This document is provided
&quot;as is&quot; without express or implied warranty, and with
no claim as to its suitability for any purpose.</p>
<p>Based on contributions by Steve Cleary, Beman Dawes, Howard
Hinnant and John Maddock.</p>
<p>Maintained by <a href="mailto:John_Maddock@compuserve.com">John
Maddock</a>, the latest version of this file can be found at <a
href="http://www.boost.org">www.boost.org</a>, and the boost
discussion list at <a href="http://www.egroups.com/list/boost">www.egroups.com/list/boost</a>.</p>
<p>&nbsp;</p>
</body>
</html>
</body>
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@ -1,125 +1,393 @@
// boost::compressed_pair test program
// boost::compressed_pair test program
// (C) Copyright John Maddock 2000. Permission to copy, use, modify, sell and
// distribute this software is granted provided this copyright notice appears
// in all copies. This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
// (C) Copyright John Maddock 2000.
// Use, modification and distribution are subject to the Boost Software License,
// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt).
// standalone test program for <boost/compressed_pair.hpp>
// Revised 03 Oct 2000:
// Enabled tests for VC6.
#include <iostream>
#include <typeinfo>
#include <cassert>
#include <boost/compressed_pair.hpp>
#include "type_traits_test.hpp"
#include <boost/test/test_tools.hpp>
using namespace boost;
struct empty_POD_UDT{};
struct empty_UDT
{
~empty_UDT(){};
~empty_UDT(){};
empty_UDT& operator=(const empty_UDT&){ return *this; }
bool operator==(const empty_UDT&)const
{ return true; }
};
namespace boost {
#ifndef BOOST_NO_INCLASS_MEMBER_INITIALIZATION
template <> struct is_empty<empty_UDT>
{ static const bool value = true; };
template <> struct is_empty<empty_POD_UDT>
{ static const bool value = true; };
template <> struct is_POD<empty_POD_UDT>
{ static const bool value = true; };
#else
template <> struct is_empty<empty_UDT>
{ enum{ value = true }; };
template <> struct is_empty<empty_POD_UDT>
{ enum{ value = true }; };
template <> struct is_POD<empty_POD_UDT>
{ enum{ value = true }; };
#endif
}
int main()
struct empty_POD_UDT
{
compressed_pair<int, double> cp1(1, 1.3);
assert(cp1.first() == 1);
assert(cp1.second() == 1.3);
compressed_pair<int, double> cp1b(2, 2.3);
assert(cp1b.first() == 2);
assert(cp1b.second() == 2.3);
swap(cp1, cp1b);
assert(cp1b.first() == 1);
assert(cp1b.second() == 1.3);
assert(cp1.first() == 2);
assert(cp1.second() == 2.3);
#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
compressed_pair<empty_UDT, int> cp2(2);
assert(cp2.second() == 2);
#endif
compressed_pair<int, empty_UDT> cp3(1);
assert(cp3.first() ==1);
compressed_pair<empty_UDT, empty_UDT> cp4;
compressed_pair<empty_UDT, empty_POD_UDT> cp5;
#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
int i = 0;
compressed_pair<int&, int&> cp6(i,i);
assert(cp6.first() == i);
assert(cp6.second() == i);
assert(&cp6.first() == &i);
assert(&cp6.second() == &i);
compressed_pair<int, double[2]> cp7;
cp7.first();
double* pd = cp7.second();
#endif
value_test(true, (sizeof(compressed_pair<empty_UDT, int>) < sizeof(std::pair<empty_UDT, int>)))
value_test(true, (sizeof(compressed_pair<int, empty_UDT>) < sizeof(std::pair<int, empty_UDT>)))
value_test(true, (sizeof(compressed_pair<empty_UDT, empty_UDT>) < sizeof(std::pair<empty_UDT, empty_UDT>)))
value_test(true, (sizeof(compressed_pair<empty_UDT, empty_POD_UDT>) < sizeof(std::pair<empty_UDT, empty_POD_UDT>)))
value_test(true, (sizeof(compressed_pair<empty_UDT, compressed_pair<empty_POD_UDT, int> >) < sizeof(std::pair<empty_UDT, std::pair<empty_POD_UDT, int> >)))
empty_POD_UDT& operator=(const empty_POD_UDT&){ return *this; }
bool operator==(const empty_POD_UDT&)const
{ return true; }
};
std::cout << std::endl << test_count << " tests completed (" << failures << " failures)... press any key to exit";
std::cin.get();
return failures;
struct non_empty1
{
int i;
non_empty1() : i(1){}
non_empty1(int v) : i(v){}
friend bool operator==(const non_empty1& a, const non_empty1& b)
{ return a.i == b.i; }
};
struct non_empty2
{
int i;
non_empty2() : i(3){}
non_empty2(int v) : i(v){}
friend bool operator==(const non_empty2& a, const non_empty2& b)
{ return a.i == b.i; }
};
#ifdef __GNUC__
using std::swap;
#endif
template <class T1, class T2>
struct compressed_pair_tester
{
// define the types we need:
typedef T1 first_type;
typedef T2 second_type;
typedef typename call_traits<first_type>::param_type first_param_type;
typedef typename call_traits<second_type>::param_type second_param_type;
// define our test proc:
static void test(first_param_type p1, second_param_type p2, first_param_type p3, second_param_type p4);
};
template <class T1, class T2>
void compressed_pair_tester<T1, T2>::test(first_param_type p1, second_param_type p2, first_param_type p3, second_param_type p4)
{
#ifndef __GNUC__
// gcc 2.90 can't cope with function scope using
// declarations, and generates an internal compiler error...
using std::swap;
#endif
// default construct:
boost::compressed_pair<T1,T2> cp1;
// first param construct:
boost::compressed_pair<T1,T2> cp2(p1);
cp2.second() = p2;
BOOST_CHECK(cp2.first() == p1);
BOOST_CHECK(cp2.second() == p2);
// second param construct:
boost::compressed_pair<T1,T2> cp3(p2);
cp3.first() = p1;
BOOST_CHECK(cp3.second() == p2);
BOOST_CHECK(cp3.first() == p1);
// both param construct:
boost::compressed_pair<T1,T2> cp4(p1, p2);
BOOST_CHECK(cp4.first() == p1);
BOOST_CHECK(cp4.second() == p2);
boost::compressed_pair<T1,T2> cp5(p3, p4);
BOOST_CHECK(cp5.first() == p3);
BOOST_CHECK(cp5.second() == p4);
// check const members:
const boost::compressed_pair<T1,T2>& cpr1 = cp4;
BOOST_CHECK(cpr1.first() == p1);
BOOST_CHECK(cpr1.second() == p2);
// copy construct:
boost::compressed_pair<T1,T2> cp6(cp4);
BOOST_CHECK(cp6.first() == p1);
BOOST_CHECK(cp6.second() == p2);
// assignment:
cp1 = cp4;
BOOST_CHECK(cp1.first() == p1);
BOOST_CHECK(cp1.second() == p2);
cp1 = cp5;
BOOST_CHECK(cp1.first() == p3);
BOOST_CHECK(cp1.second() == p4);
// swap:
cp4.swap(cp5);
BOOST_CHECK(cp4.first() == p3);
BOOST_CHECK(cp4.second() == p4);
BOOST_CHECK(cp5.first() == p1);
BOOST_CHECK(cp5.second() == p2);
swap(cp4,cp5);
BOOST_CHECK(cp4.first() == p1);
BOOST_CHECK(cp4.second() == p2);
BOOST_CHECK(cp5.first() == p3);
BOOST_CHECK(cp5.second() == p4);
}
//
// instanciate some compressed pairs:
#ifdef __MWERKS__
template class compressed_pair<int, double>;
template class compressed_pair<int, int>;
template class compressed_pair<empty_UDT, int>;
template class compressed_pair<int, empty_UDT>;
template class compressed_pair<empty_UDT, empty_UDT>;
template class compressed_pair<empty_UDT, empty_POD_UDT>;
#else
template class boost::compressed_pair<int, double>;
template class boost::compressed_pair<int, int>;
template class boost::compressed_pair<empty_UDT, int>;
template class boost::compressed_pair<int, empty_UDT>;
template class boost::compressed_pair<empty_UDT, empty_UDT>;
template class boost::compressed_pair<empty_UDT, empty_POD_UDT>;
#endif
// tests for case where one or both
// parameters are reference types:
//
template <class T1, class T2>
struct compressed_pair_reference_tester
{
// define the types we need:
typedef T1 first_type;
typedef T2 second_type;
typedef typename call_traits<first_type>::param_type first_param_type;
typedef typename call_traits<second_type>::param_type second_param_type;
// define our test proc:
static void test(first_param_type p1, second_param_type p2, first_param_type p3, second_param_type p4);
};
template <class T1, class T2>
void compressed_pair_reference_tester<T1, T2>::test(first_param_type p1, second_param_type p2, first_param_type p3, second_param_type p4)
{
#ifndef __GNUC__
// gcc 2.90 can't cope with function scope using
// declarations, and generates an internal compiler error...
using std::swap;
#endif
// both param construct:
boost::compressed_pair<T1,T2> cp4(p1, p2);
BOOST_CHECK(cp4.first() == p1);
BOOST_CHECK(cp4.second() == p2);
boost::compressed_pair<T1,T2> cp5(p3, p4);
BOOST_CHECK(cp5.first() == p3);
BOOST_CHECK(cp5.second() == p4);
// check const members:
const boost::compressed_pair<T1,T2>& cpr1 = cp4;
BOOST_CHECK(cpr1.first() == p1);
BOOST_CHECK(cpr1.second() == p2);
// copy construct:
boost::compressed_pair<T1,T2> cp6(cp4);
BOOST_CHECK(cp6.first() == p1);
BOOST_CHECK(cp6.second() == p2);
// assignment:
// VC6 bug:
// When second() is an empty class, VC6 performs the
// assignment by doing a memcpy - even though the empty
// class is really a zero sized base class, the result
// is that the memory of first() gets trampled over.
// Similar arguments apply to the case that first() is
// an empty base class.
// Strangely the problem is dependent upon the compiler
// settings - some generate the problem others do not.
cp4.first() = p3;
cp4.second() = p4;
BOOST_CHECK(cp4.first() == p3);
BOOST_CHECK(cp4.second() == p4);
}
//
// supplimentary tests for case where first arg only is a reference type:
//
template <class T1, class T2>
struct compressed_pair_reference1_tester
{
// define the types we need:
typedef T1 first_type;
typedef T2 second_type;
typedef typename call_traits<first_type>::param_type first_param_type;
typedef typename call_traits<second_type>::param_type second_param_type;
// define our test proc:
static void test(first_param_type p1, second_param_type p2, first_param_type p3, second_param_type p4);
};
template <class T1, class T2>
void compressed_pair_reference1_tester<T1, T2>::test(first_param_type p1, second_param_type p2, first_param_type, second_param_type)
{
#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
//
// now some for which only a few specific members can be instantiated,
// first references:
template double& compressed_pair<double, int&>::first();
template int& compressed_pair<double, int&>::second();
template compressed_pair<double, int&>::compressed_pair(int&);
template compressed_pair<double, int&>::compressed_pair(call_traits<double>::param_type,int&);
//
// and then arrays:
#ifndef __MWERKS__
#ifndef __BORLANDC__
template call_traits<int[2]>::reference compressed_pair<double, int[2]>::second();
// first param construct:
boost::compressed_pair<T1,T2> cp2(p1);
cp2.second() = p2;
BOOST_CHECK(cp2.first() == p1);
BOOST_CHECK(cp2.second() == p2);
#endif
template call_traits<double>::reference compressed_pair<double, int[2]>::first();
template compressed_pair<double, int[2]>::compressed_pair(const double&);
template compressed_pair<double, int[2]>::compressed_pair();
#endif // __MWERKS__
#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
}
//
// supplimentary tests for case where second arg only is a reference type:
//
template <class T1, class T2>
struct compressed_pair_reference2_tester
{
// define the types we need:
typedef T1 first_type;
typedef T2 second_type;
typedef typename call_traits<first_type>::param_type first_param_type;
typedef typename call_traits<second_type>::param_type second_param_type;
// define our test proc:
static void test(first_param_type p1, second_param_type p2, first_param_type p3, second_param_type p4);
};
template <class T1, class T2>
void compressed_pair_reference2_tester<T1, T2>::test(first_param_type p1, second_param_type p2, first_param_type, second_param_type)
{
#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
// second param construct:
boost::compressed_pair<T1,T2> cp3(p2);
cp3.first() = p1;
BOOST_CHECK(cp3.second() == p2);
BOOST_CHECK(cp3.first() == p1);
#endif
}
//
// tests for where one or the other parameter is an array:
//
template <class T1, class T2>
struct compressed_pair_array1_tester
{
// define the types we need:
typedef T1 first_type;
typedef T2 second_type;
typedef typename call_traits<first_type>::param_type first_param_type;
typedef typename call_traits<second_type>::param_type second_param_type;
// define our test proc:
static void test(first_param_type p1, second_param_type p2, first_param_type p3, second_param_type p4);
};
template <class T1, class T2>
void compressed_pair_array1_tester<T1, T2>::test(first_param_type p1, second_param_type p2, first_param_type, second_param_type)
{
// default construct:
boost::compressed_pair<T1,T2> cp1;
// second param construct:
boost::compressed_pair<T1,T2> cp3(p2);
cp3.first()[0] = p1[0];
BOOST_CHECK(cp3.second() == p2);
BOOST_CHECK(cp3.first()[0] == p1[0]);
// check const members:
const boost::compressed_pair<T1,T2>& cpr1 = cp3;
BOOST_CHECK(cpr1.first()[0] == p1[0]);
BOOST_CHECK(cpr1.second() == p2);
BOOST_CHECK(sizeof(T1) == sizeof(cp1.first()));
}
template <class T1, class T2>
struct compressed_pair_array2_tester
{
// define the types we need:
typedef T1 first_type;
typedef T2 second_type;
typedef typename call_traits<first_type>::param_type first_param_type;
typedef typename call_traits<second_type>::param_type second_param_type;
// define our test proc:
static void test(first_param_type p1, second_param_type p2, first_param_type p3, second_param_type p4);
};
template <class T1, class T2>
void compressed_pair_array2_tester<T1, T2>::test(first_param_type p1, second_param_type p2, first_param_type, second_param_type)
{
// default construct:
boost::compressed_pair<T1,T2> cp1;
// first param construct:
boost::compressed_pair<T1,T2> cp2(p1);
cp2.second()[0] = p2[0];
BOOST_CHECK(cp2.first() == p1);
BOOST_CHECK(cp2.second()[0] == p2[0]);
// check const members:
const boost::compressed_pair<T1,T2>& cpr1 = cp2;
BOOST_CHECK(cpr1.first() == p1);
BOOST_CHECK(cpr1.second()[0] == p2[0]);
BOOST_CHECK(sizeof(T2) == sizeof(cp1.second()));
}
template <class T1, class T2>
struct compressed_pair_array_tester
{
// define the types we need:
typedef T1 first_type;
typedef T2 second_type;
typedef typename call_traits<first_type>::param_type first_param_type;
typedef typename call_traits<second_type>::param_type second_param_type;
// define our test proc:
static void test(first_param_type p1, second_param_type p2, first_param_type p3, second_param_type p4);
};
template <class T1, class T2>
void compressed_pair_array_tester<T1, T2>::test(first_param_type p1, second_param_type p2, first_param_type, second_param_type)
{
// default construct:
boost::compressed_pair<T1,T2> cp1;
cp1.first()[0] = p1[0];
cp1.second()[0] = p2[0];
BOOST_CHECK(cp1.first()[0] == p1[0]);
BOOST_CHECK(cp1.second()[0] == p2[0]);
// check const members:
const boost::compressed_pair<T1,T2>& cpr1 = cp1;
BOOST_CHECK(cpr1.first()[0] == p1[0]);
BOOST_CHECK(cpr1.second()[0] == p2[0]);
BOOST_CHECK(sizeof(T1) == sizeof(cp1.first()));
BOOST_CHECK(sizeof(T2) == sizeof(cp1.second()));
}
int test_main(int, char *[])
{
// declare some variables to pass to the tester:
non_empty1 ne1(2);
non_empty1 ne2(3);
non_empty2 ne3(4);
non_empty2 ne4(5);
empty_POD_UDT e1;
empty_UDT e2;
// T1 != T2, both non-empty
compressed_pair_tester<non_empty1,non_empty2>::test(ne1, ne3, ne2, ne4);
// T1 != T2, T2 empty
compressed_pair_tester<non_empty1,empty_POD_UDT>::test(ne1, e1, ne2, e1);
// T1 != T2, T1 empty
compressed_pair_tester<empty_POD_UDT,non_empty2>::test(e1, ne3, e1, ne4);
// T1 != T2, both empty
compressed_pair_tester<empty_POD_UDT,empty_UDT>::test(e1, e2, e1, e2);
// T1 == T2, both non-empty
compressed_pair_tester<non_empty1,non_empty1>::test(ne1, ne1, ne2, ne2);
// T1 == T2, both empty
compressed_pair_tester<empty_UDT,empty_UDT>::test(e2, e2, e2, e2);
// test references:
// T1 != T2, both non-empty
compressed_pair_reference_tester<non_empty1&,non_empty2>::test(ne1, ne3, ne2, ne4);
compressed_pair_reference_tester<non_empty1,non_empty2&>::test(ne1, ne3, ne2, ne4);
compressed_pair_reference1_tester<non_empty1&,non_empty2>::test(ne1, ne3, ne2, ne4);
compressed_pair_reference2_tester<non_empty1,non_empty2&>::test(ne1, ne3, ne2, ne4);
// T1 != T2, T2 empty
compressed_pair_reference_tester<non_empty1&,empty_POD_UDT>::test(ne1, e1, ne2, e1);
compressed_pair_reference1_tester<non_empty1&,empty_POD_UDT>::test(ne1, e1, ne2, e1);
// T1 != T2, T1 empty
compressed_pair_reference_tester<empty_POD_UDT,non_empty2&>::test(e1, ne3, e1, ne4);
compressed_pair_reference2_tester<empty_POD_UDT,non_empty2&>::test(e1, ne3, e1, ne4);
// T1 == T2, both non-empty
compressed_pair_reference_tester<non_empty1&,non_empty1&>::test(ne1, ne1, ne2, ne2);
// tests arrays:
non_empty1 nea1[2];
non_empty1 nea2[2];
non_empty2 nea3[2];
non_empty2 nea4[2];
nea1[0] = non_empty1(5);
nea2[0] = non_empty1(6);
nea3[0] = non_empty2(7);
nea4[0] = non_empty2(8);
// T1 != T2, both non-empty
compressed_pair_array1_tester<non_empty1[2],non_empty2>::test(nea1, ne3, nea2, ne4);
compressed_pair_array2_tester<non_empty1,non_empty2[2]>::test(ne1, nea3, ne2, nea4);
compressed_pair_array_tester<non_empty1[2],non_empty2[2]>::test(nea1, nea3, nea2, nea4);
// T1 != T2, T2 empty
compressed_pair_array1_tester<non_empty1[2],empty_POD_UDT>::test(nea1, e1, nea2, e1);
// T1 != T2, T1 empty
compressed_pair_array2_tester<empty_POD_UDT,non_empty2[2]>::test(e1, nea3, e1, nea4);
// T1 == T2, both non-empty
compressed_pair_array_tester<non_empty1[2],non_empty1[2]>::test(nea1, nea1, nea2, nea2);
return 0;
}
unsigned int expected_failures = 0;

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title>Boost: current_function.hpp documentation</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>
<body bgcolor="white" style="MARGIN-LEFT: 5%; MARGIN-RIGHT: 5%">
<table border="0" width="100%">
<tr>
<td width="277"><A href="../../index.htm"> <img src="../../boost.png" alt="boost.png (6897 bytes)" width="277" height="86" border="0"></A>
</td>
<td align="center">
<h1>current_function.hpp</h1>
</td>
</tr>
<tr>
<td colspan="2" height="64">&nbsp;</td>
</tr>
</table>
<p>
The header <STRONG>&lt;boost/current_function.hpp&gt;</STRONG> defines a single
macro, <STRONG>BOOST_CURRENT_FUNCTION</STRONG>,<STRONG> </STRONG>similar to the
C99 predefined identifier <STRONG>__func__</STRONG>.
</p>
<P><STRONG>BOOST_CURRENT_FUNCTION</STRONG> expands to a string literal containing
the (fully qualified, if possible) name of the enclosing function. If there is
no enclosing function, the behavior is undefined.</P>
<p>Some compilers do not provide a way to obtain the name of the current enclosing
function. On such compilers, the string literal has an unspecified value.</p>
<p>
<br>
<small>Copyright <20> 2002 by Peter Dimov. Distributed under the Boost Software License, Version
1.0. See accompanying file <A href="../../LICENSE_1_0.txt">LICENSE_1_0.txt</A> or
copy at <A href="http://www.boost.org/LICENSE_1_0.txt">http://www.boost.org/LICENSE_1_0.txt</A>.</small></p>
</body>
</html>

40
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#include <boost/config.hpp>
#if defined(BOOST_MSVC)
#pragma warning(disable: 4786) // identifier truncated in debug info
#pragma warning(disable: 4710) // function not inlined
#pragma warning(disable: 4711) // function selected for automatic inline expansion
#pragma warning(disable: 4514) // unreferenced inline removed
#endif
//
// current_function_test.cpp - a test for boost/current_function.hpp
//
// Copyright (c) 2002 Peter Dimov and Multi Media Ltd.
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
#include <boost/current_function.hpp>
#include <boost/config.hpp>
#include <cstdio>
void message(char const * file, long line, char const * func, char const * msg)
{
#if !defined(BOOST_NO_STDC_NAMESPACE)
using std::printf;
#endif
printf("%s(%ld): %s in function '%s'\n", file, line, msg, func);
}
#define MESSAGE(msg) message(__FILE__, __LINE__, BOOST_CURRENT_FUNCTION, msg)
int main()
{
MESSAGE("assertion failed");
return 0;
}

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<HEAD><TITLE>enable_if</TITLE>
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<!--HEVEA command line is: hevea -nosymb -noiso -pedantic -v enable_if_docs_for_boost.tex -->
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<!--PREFIX <ARG ></ARG>-->
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<BR>
<BR>
<h1>
<img border="0" src="../../boost.png" align="center" width="277" height="86">enable_if</h1>
<BR>
<BR>
Copyright 2003 Jaakko J&auml;rvi, Jeremiah Willcock, Andrew Lumsdaine.<BR>
<BR>
<!--TOC section Introduction-->
<H2><A NAME="htoc1">1</A>&nbsp;&nbsp;Introduction</H2><!--SEC END -->
<A NAME="introduction"></A>
The <TT>enable_if</TT> family of templates is a set of tools to allow a function template or a class template specialization
to include or exclude itself from a set of matching functions or specializations
based on properties of its template arguments.
For example, one can define function templates that
are only enabled for, and thus only match, an arbitrary set of types
defined by a traits class. The <TT>enable_if</TT> templates can also be
applied to enable class template specializations. Applications of
<TT>enable_if</TT> are discussed in length
in&nbsp;[<A HREF="#jarvi:03:cuj_arbitrary_overloading"><CITE>1</CITE></A>] and&nbsp;[<A HREF="#jarvi:03:c++typeclasses"><CITE>2</CITE></A>].<BR>
<BR>
<!--TOC subsection Synopsis-->
<H3><A NAME="htoc2">1.1</A>&nbsp;&nbsp;Synopsis</H3><!--SEC END -->
<A NAME="sec:synopsis"></A>
<PRE>namespace boost {
template &lt;class Cond, class T = void&gt; struct enable_if;
template &lt;class Cond, class T = void&gt; struct disable_if;
template &lt;class Cond, class T&gt; struct lazy_enable_if;
template &lt;class Cond, class T&gt; struct lazy_disable_if;
template &lt;bool B, class T = void&gt; struct enable_if_c;
template &lt;bool B, class T = void&gt; struct disable_if_c;
template &lt;bool B, class T&gt; struct lazy_enable_if_c;
template &lt;bool B, class T&gt; struct lazy_disable_if_c;
}
</PRE>
<!--TOC subsection Background-->
<H3><A NAME="htoc3">1.2</A>&nbsp;&nbsp;Background</H3><!--SEC END -->
<A NAME="sec:background"></A>
Sensible operation of template function overloading in C++ relies
on the <EM>SFINAE</EM> (substitution-failure-is-not-an-error)
principle&nbsp;[<A HREF="#vandevoorde2002:templates"><CITE>3</CITE></A>]: if an invalid argument
or return type is formed during the instantiation of a function
template, the instantiation is removed from the overload resolution
set instead of causing a compilation error. The following example,
taken from&nbsp;[<A HREF="#jarvi:03:cuj_arbitrary_overloading"><CITE>1</CITE></A>],
demonstrates why this is important:
<PRE>int negate(int i) { return -i; }
template &lt;class F&gt;
typename F::result_type negate(const F&amp; f) { return -f(); }
</PRE>
Suppose the compiler encounters the call <TT>negate(1)</TT>. The first
definition is obviously a better match, but the compiler must
nevertheless consider (and instantiate the prototypes) of both
definitions to find this out. Instantiating the latter definition with
<TT>F</TT> as <TT>int</TT> would result in:
<PRE>int::result_type negate(const int&amp;);
</PRE>
where the return type is invalid. If this was an error, adding an unrelated function template
(that was never called) could break otherwise valid code.
Due to the SFINAE principle the above example is not, however, erroneous.
The latter definition of <TT>negate</TT> is simply removed from the overload resolution set.<BR>
<BR>
The <TT>enable_if</TT> templates are tools for controlled creation of the SFINAE
conditions.<BR>
<BR>
<!--TOC section The <TT>enable_if</TT> templates-->
<H2><A NAME="htoc4">2</A>&nbsp;&nbsp;The <TT>enable_if</TT> templates</H2><!--SEC END -->
<A NAME="enable_if"></A>
The names of the <TT>enable_if</TT> templates have three parts: an optional <TT>lazy_</TT> tag,
either <TT>enable_if</TT> or <TT>disable_if</TT>, and an optional <TT>_c</TT> tag.
All eight combinations of these parts are supported.
The meaning of the <TT>lazy_</TT> tag is described in Section&nbsp;<A HREF="#sec:enable_if_lazy">3.3</A>.
The second part of the name indicates whether a true condition argument should
enable or disable the current overload.
The third part of the name indicates whether the condition argument is a <TT>bool</TT> value
(<TT>_c</TT> suffix), or a type containing a static <TT>bool</TT> constant named <TT>value</TT> (no suffix).
The latter version interoperates with Boost.MPL. <BR>
<BR>
The definitions of <TT>enable_if_c</TT> and <TT>enable_if</TT> are as follows (we use <TT>enable_if</TT> templates
unqualified but they are in the <TT>boost</TT> namespace).
<PRE>template &lt;bool B, class T = void&gt;
struct enable_if_c {
typedef T type;
};
template &lt;class T&gt;
struct enable_if_c&lt;false, T&gt; {};
template &lt;class Cond, class T = void&gt;
struct enable_if : public enable_if_c&lt;Cond::value, T&gt; {};
</PRE>
An instantiation of the <TT>enable_if_c</TT> template with the parameter
<TT>B</TT> as <TT>true</TT> contains a member type <TT>type</TT>, defined
to be <TT>T</TT>. If <TT>B</TT> is
<TT>false</TT>, no such member is defined. Thus
<TT>enable_if_c&lt;B, T&gt;::type</TT> is either a valid or an invalid type
expression, depending on the value of <TT>B</TT>.
When valid, <TT>enable_if_c&lt;B, T&gt;::type</TT> equals <TT>T</TT>.
The <TT>enable_if_c</TT> template can thus be used for controlling when functions are considered for
overload resolution and when they are not.
For example, the following function is defined for all arithmetic types (according to the
classification of the <A HREF="../type_traits/index.html">Boost type_traits library</A>):
<PRE>template &lt;class T&gt;
typename enable_if_c&lt;boost::is_arithmetic&lt;T&gt;::value, T&gt;::type
foo(T t) { return t; }
</PRE>
The <TT>disable_if_c</TT> template is provided as well, and has the
same functionality as <TT>enable_if_c</TT> except for the negated condition. The following
function is enabled for all non-arithmetic types.
<PRE>template &lt;class T&gt;
typename disable_if_c&lt;boost::is_arithmetic&lt;T&gt;::value, T&gt;::type
bar(T t) { return t; }
</PRE>
For easier syntax in some cases and interoperation with Boost.MPL we provide versions of
the <TT>enable_if</TT> templates taking any type with a <TT>bool</TT> member constant named
<TT>value</TT> as the condition argument.
The MPL <TT>bool_</TT>, <TT>and_</TT>, <TT>or_</TT>, and <TT>not_</TT> templates are likely to be
useful for creating such types. Also, the traits classes in the Boost.Type_traits library
follow this convention.
For example, the above example function <TT>foo</TT> can be alternatively written as:
<PRE>template &lt;class T&gt;
typename enable_if&lt;boost::is_arithmetic&lt;T&gt;, T&gt;::type
foo(T t) { return t; }
</PRE>
<!--TOC section Using <TT>enable_if</TT>-->
<H2><A NAME="htoc5">3</A>&nbsp;&nbsp;Using <TT>enable_if</TT></H2><!--SEC END -->
<A NAME="sec:using_enable_if"></A>
The <TT>enable_if</TT> templates are defined in
<TT>boost/utility/enable_if.hpp</TT>, which is included by <TT>boost/utility.hpp</TT>.<BR>
<BR>
The <TT>enable_if</TT> template can be used either as the return type, or as an
extra argument. For example, the <TT>foo</TT> function in the previous section could also be written
as:
<PRE>template &lt;class T&gt;
T foo(T t, typename enable_if&lt;boost::is_arithmetic&lt;T&gt; &gt;::type* dummy = 0);
</PRE>Hence, an extra parameter of type <TT>void*</TT> is added, but it is given
a default value to keep the parameter hidden from client code.
Note that the second template argument was not given to <TT>enable_if</TT>, as the default
<TT>void</TT> gives the desired behavior.<BR>
<BR>
Whether to write the enabler as an argument or within the return type is
largely a matter of taste, but for certain functions, only one
alternative is possible:
<UL><LI>
Operators have a fixed number of arguments, thus <TT>enable_if</TT> must be used in the return type.
<LI>Constructors and destructors do not have a return type; an extra argument is the only option.
<LI>There does not seem to be a way to specify an enabler for a conversion operator. Converting constructors,
however, can have enablers as extra default arguments.
</UL>
<!--TOC subsection Enabling template class specializations-->
<H3><A NAME="htoc6">3.1</A>&nbsp;&nbsp;Enabling template class specializations</H3><!--SEC END -->
<A NAME="sec:enable_if_classes"></A>
Class template specializations can be enabled or disabled with <TT>enable_if</TT>.
One extra template parameter needs to be added for the enabler expressions.
This parameter has the default value <TT>void</TT>.
For example:
<PRE>template &lt;class T, class Enable = void&gt;
class A { ... };
template &lt;class T&gt;
class A&lt;T, typename enable_if&lt;is_integral&lt;T&gt; &gt;::type&gt; { ... };
template &lt;class T&gt;
class A&lt;T, typename enable_if&lt;is_float&lt;T&gt; &gt;::type&gt; { ... };
</PRE>Instantiating <TT>A</TT> with any integral type matches the first specialization,
whereas any floating point type matches the second one. All other types
match the primary template.
The condition can be any compile-time boolean expression that depends on the
template arguments of the class.
Note that again, the second argument to <TT>enable_if</TT> is not needed; the default (<TT>void</TT>)
is the correct value.<BR>
<BR>
<!--TOC subsection Overlapping enabler conditions-->
<H3><A NAME="htoc7">3.2</A>&nbsp;&nbsp;Overlapping enabler conditions</H3><!--SEC END -->
<A NAME="sec:overlapping_conditions"></A>
Once the compiler has examined the enabling conditions and included the
function into the overload resolution set, normal C++ overload resolution
rules are used to select the best matching function.
In particular, there is no ordering between enabling conditions.
Function templates with enabling conditions that are not mutually exclusive can
lead to ambiguities. For example:
<PRE>template &lt;class T&gt;
typename enable_if&lt;boost::is_integral&lt;T&gt;, void&gt;::type
foo(T t) {}
template &lt;class T&gt;
typename enable_if&lt;boost::is_arithmetic&lt;T&gt;, void&gt;::type
foo(T t) {}
</PRE>
All integral types are also arithmetic. Therefore, say, for the call <TT>foo(1)</TT>,
both conditions are true and both functions are thus in the overload resolution set.
They are both equally good matches and thus ambiguous.
Of course, more than one enabling condition can be simultaneously true as long as
other arguments disambiguate the functions.<BR>
<BR>
The above discussion applies to using <TT>enable_if</TT> in class template
partial specializations as well.<BR>
<BR>
<!--TOC subsection Lazy <TT>enable_if</TT>-->
<H3><A NAME="htoc8">3.3</A>&nbsp;&nbsp;Lazy <TT>enable_if</TT></H3><!--SEC END -->
<A NAME="sec:enable_if_lazy"></A>
In some cases it is necessary to avoid instantiating part of a
function signature unless an enabling condition is true. For example:
<PRE>template &lt;class T, class U&gt; class mult_traits;
template &lt;class T, class U&gt;
typename enable_if&lt;is_multipliable&lt;T, U&gt;, typename mult_traits&lt;T, U&gt;::type&gt;::type
operator*(const T&amp; t, const U&amp; u) { ... }
</PRE>Assume the class template <TT>mult_traits</TT> is a traits class defining
the resulting type of a multiplication operator. The <TT>is_multipliable</TT> traits
class specifies for which types to enable the operator. Whenever
<TT>is_multipliable&lt;A, B&gt;::value</TT> is <TT>true</TT> for some types <TT>A</TT> and <TT>B</TT>,
then <TT>mult_traits&lt;A, B&gt;::type</TT> is defined.<BR>
<BR>
Now, trying to invoke (some other overload) of <TT>operator*</TT> with, say, operand types <TT>C</TT> and <TT>D</TT>
for which <TT>is_multipliable&lt;C, D&gt;::value</TT> is <TT>false</TT>
and <TT>mult_traits&lt;C, D&gt;::type</TT> is not defined is an error on some compilers.
The SFINAE principle is not applied because
the invalid type occurs as an argument to another template. The <TT>lazy_enable_if</TT>
and <TT>lazy_disable_if</TT> templates (and their <TT>_c</TT> versions) can be used in such
situations:
<PRE>template&lt;class T, class U&gt;
typename lazy_enable_if&lt;is_multipliable&lt;T, U&gt;, mult_traits&lt;T, U&gt; &gt;::type
operator*(const T&amp; t, const U&amp; u) { ... }
</PRE>The second argument of <TT>lazy_enable_if</TT> must be a class type
that defines a nested type named <TT>type</TT> whenever the first
parameter (the condition) is true.<BR>
<BR>
<!--TOC paragraph Note-->
<H5>Note</H5><!--SEC END -->
Referring to one member type or static constant in a traits class
causes all of the members (type and static constant) of that
specialization to be instantiated. Therefore, if your traits classes
can sometimes contain invalid types, you should use two distinct
templates for describing the conditions and the type mappings. In the
above example, <TT>is_multipliable&lt;T, U&gt;::value</TT> defines when
<TT>mult_traits&lt;T, U&gt;::type</TT> is valid.<BR>
<BR>
<!--TOC subsection Compiler workarounds-->
<H3><A NAME="htoc9">3.4</A>&nbsp;&nbsp;Compiler workarounds</H3><!--SEC END -->
<A NAME="sec:workarounds"></A>
Some compilers flag functions as ambiguous if the only distinguishing factor is a different
condition in an enabler (even though the functions could never be ambiguous). For example,
some compilers (e.g. GCC 3.2) diagnose the following two functions as ambiguous:
<PRE>template &lt;class T&gt;
typename enable_if&lt;boost::is_arithmetic&lt;T&gt;, T&gt;::type
foo(T t);
template &lt;class T&gt;
typename disable_if&lt;boost::is_arithmetic&lt;T&gt;, T&gt;::type
foo(T t);
</PRE>Two workarounds can be applied:
<UL><LI>
Use an extra dummy parameter which disambiguates the functions. Use a default value for
it to hide the parameter from the caller. For example:
<PRE>template &lt;int&gt; struct dummy { dummy(int) {} };
template &lt;class T&gt;
typename enable_if&lt;boost::is_arithmetic&lt;T&gt;, T&gt;::type
foo(T t, dummy&lt;0&gt; = 0);
template &lt;class T&gt;
typename disable_if&lt;boost::is_arithmetic&lt;T&gt;, T&gt;::type
foo(T t, dummy&lt;1&gt; = 0);
</PRE><BR>
<BR>
<LI>Define the functions in different namespaces and bring them into a common
namespace with <TT>using</TT> declarations:
<PRE>namespace A {
template &lt;class T&gt;
typename enable_if&lt;boost::is_arithmetic&lt;T&gt;, T&gt;::type
foo(T t);
}
namespace B {
template &lt;class T&gt;
typename disable_if&lt;boost::is_arithmetic&lt;T&gt;, T&gt;::type
foo(T t);
}
using A::foo;
using B::foo;
</PRE>
Note that the second workaround above cannot be used for member
templates. On the other hand, operators do not accept extra arguments,
which makes the first workaround unusable. As the net effect,
neither of the workarounds are of assistance for templated operators that
need to be defined as member functions (assignment and
subscript operators).
</UL>
<!--TOC section Acknowledgements-->
<H2><A NAME="htoc10">4</A>&nbsp;&nbsp;Acknowledgements</H2><!--SEC END -->
We are grateful to Howard Hinnant, Jason Shirk, Paul Mensonides, and Richard
Smith whose findings have influenced the library.<BR>
<BR>
<!--TOC section References-->
<H2>References</H2><!--SEC END -->
<DL COMPACT=compact><DT><A NAME="jarvi:03:cuj_arbitrary_overloading"><FONT COLOR=purple>[1]</FONT></A><DD>
Jaakko J&auml;rvi, Jeremiah Willcock, Howard Hinnant, and Andrew Lumsdaine.
Function overloading based on arbitrary properties of types.
<EM>C/C++ Users Journal</EM>, 21(6):25--32, June 2003.<BR>
<BR>
<DT><A NAME="jarvi:03:c++typeclasses"><FONT COLOR=purple>[2]</FONT></A><DD>
Jaakko J&auml;rvi, Jeremiah Willcock, and Andrew Lumsdaine.
Concept-controlled polymorphism.
In Frank Pfennig and Yannis Smaragdakis, editors, <EM>Generative
Programming and Component Engineering</EM>, volume 2830 of <EM>LNCS</EM>, pages
228--244. Springer Verlag, September 2003.<BR>
<BR>
<DT><A NAME="vandevoorde2002:templates"><FONT COLOR=purple>[3]</FONT></A><DD>
David Vandevoorde and Nicolai&nbsp;M. Josuttis.
<EM>C++ Templates: The Complete Guide</EM>.
Addison-Wesley, 2002.</DL>
<hr/>
<p>Copyright Jaakko J&auml;rvi, Jeremiah Willcock and Andrew Lumsdaine<BR>
<EM>{jajarvi|jewillco|lums}@osl.iu.edu</EM><BR>
Indiana University<BR>
Open Systems Lab<br/>
Use, modification and distribution are subject to the
Boost Software License, Version 1.0.
(See accompanying file LICENSE_1_0.txt
or copy at <a href="http://www.boost.org/LICENSE_1_0.txt">
http://www.boost.org/LICENSE_1_0.txt
</a>).
</p>
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# Copyright David Abrahams 2003.
# Distributed under the Boost Software License, Version 1.0.
# (See accompanying file LICENSE_1_0.txt or copy at
# http://www.boost.org/LICENSE_1_0.txt)
# For more information, see http://www.boost.org/
project
: requirements <library>/boost/test//boost_test_exec_monitor
;
test-suite utility/enable_if
:
[ run constructors.cpp ]
[ run dummy_arg_disambiguation.cpp ]
[ run lazy.cpp ]
[ run lazy_test.cpp ]
[ run member_templates.cpp ]
[ run namespace_disambiguation.cpp ]
[ run no_disambiguation.cpp ]
[ run partial_specializations.cpp ]
;

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// Boost enable_if library
// Copyright 2003 (c) The Trustees of Indiana University.
// Use, modification, and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
// Authors: Jaakko J<>rvi (jajarvi at osl.iu.edu)
// Jeremiah Willcock (jewillco at osl.iu.edu)
// Andrew Lumsdaine (lums at osl.iu.edu)
#include <boost/test/minimal.hpp>
#include <boost/utility/enable_if.hpp>
#include <boost/type_traits.hpp>
using boost::enable_if;
using boost::disable_if;
using boost::is_arithmetic;
struct container {
bool my_value;
template <class T>
container(const T&, const typename enable_if<is_arithmetic<T>, T>::type * = 0):
my_value(true) {}
template <class T>
container(const T&, const typename disable_if<is_arithmetic<T>, T>::type * = 0):
my_value(false) {}
};
// example from Howard Hinnant (tests enable_if template members of a templated class)
template <class charT>
struct xstring
{
template <class It>
xstring(It begin, It end, typename
disable_if<is_arithmetic<It> >::type* = 0)
: data(end-begin) {}
int data;
};
int test_main(int, char*[])
{
BOOST_CHECK(container(1).my_value);
BOOST_CHECK(container(1.0).my_value);
BOOST_CHECK(!container("1").my_value);
BOOST_CHECK(!container(static_cast<void*>(0)).my_value);
char sa[] = "123456";
BOOST_CHECK(xstring<char>(sa, sa+6).data == 6);
return 0;
}

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// Boost enable_if library
// Copyright 2003 (c) The Trustees of Indiana University.
// Use, modification, and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
// Authors: Jaakko J<>rvi (jajarvi at osl.iu.edu)
// Jeremiah Willcock (jewillco at osl.iu.edu)
// Andrew Lumsdaine (lums at osl.iu.edu)
#include <boost/test/minimal.hpp>
#include <boost/utility/enable_if.hpp>
#include <boost/type_traits/is_arithmetic.hpp>
using boost::enable_if;
using boost::disable_if;
using boost::is_arithmetic;
template <int N> struct dummy {
dummy(int) {};
};
template<class T>
typename enable_if<is_arithmetic<T>, bool>::type
arithmetic_object(T t, dummy<0> = 0) { return true; }
template<class T>
typename disable_if<is_arithmetic<T>, bool>::type
arithmetic_object(T t, dummy<1> = 0) { return false; }
int test_main(int, char*[])
{
BOOST_CHECK(arithmetic_object(1));
BOOST_CHECK(arithmetic_object(1.0));
BOOST_CHECK(!arithmetic_object("1"));
BOOST_CHECK(!arithmetic_object(static_cast<void*>(0)));
return 0;
}

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// Boost enable_if library
// Copyright 2003 (c) The Trustees of Indiana University.
// Use, modification, and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
// Authors: Jaakko J<>rvi (jajarvi at osl.iu.edu)
// Jeremiah Willcock (jewillco at osl.iu.edu)
// Andrew Lumsdaine (lums at osl.iu.edu)
#include <boost/test/minimal.hpp>
#include <boost/utility/enable_if.hpp>
#include <boost/type_traits/is_same.hpp>
using boost::enable_if_c;
using boost::lazy_enable_if_c;
// This class provides a reduced example of a traits class for
// computing the result of multiplying two types. The member typedef
// 'type' in this traits class defines the return type of this
// operator. The return type member is invalid unless both arguments
// for mult_traits are values that mult_traits expects (ints in this
// case). This kind of situation may arise if a traits class only
// makes sense for some set of types, not all C++ types.
template <class T> struct is_int {
BOOST_STATIC_CONSTANT(bool, value = (boost::is_same<T, int>::value));
};
template <class T, class U>
struct mult_traits {
typedef typename T::does_not_exist type;
};
template <>
struct mult_traits<int, int> {
typedef int type;
};
// Next, a forwarding function mult() is defined. It is enabled only
// when both arguments are of type int. The first version, using
// non-lazy enable_if_c does not work.
#if 0
template <class T, class U>
typename enable_if_c<
is_int<T>::value && is_int<U>::value,
typename mult_traits<T, U>::type
>::type
mult(const T& x, const U& y) {return x * y;}
#endif
// A correct version uses lazy_enable_if_c.
// This template removes compiler errors from invalid code used as an
// argument to enable_if_c.
#if 1
template <class T, class U>
typename lazy_enable_if_c<
is_int<T>::value & is_int<U>::value,
mult_traits<T, U>
>::type
mult(const T& x, const U& y) {return x * y;}
#endif
double mult(int i, double d) { return (double)i * d; }
int test_main(int, char*[])
{
BOOST_CHECK(mult(1, 2) == 2);
BOOST_CHECK(mult(1, 3.0) == 3.0);
return 0;
}

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// Boost enable_if library
// Copyright 2003 (c) The Trustees of Indiana University.
// Use, modification, and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
// Authors: Jaakko J<>rvi (jajarvi at osl.iu.edu)
// Jeremiah Willcock (jewillco at osl.iu.edu)
// Andrew Lumsdaine (lums at osl.iu.edu)
// Testing all variations of lazy_enable_if.
#include <boost/test/minimal.hpp>
#include <boost/mpl/not.hpp>
#include <boost/utility/enable_if.hpp>
#include <boost/type_traits/is_same.hpp>
using boost::lazy_enable_if;
using boost::lazy_disable_if;
using boost::lazy_enable_if_c;
using boost::lazy_disable_if_c;
template <class T>
struct is_int_or_double {
BOOST_STATIC_CONSTANT(bool,
value = (boost::is_same<T, int>::value ||
boost::is_same<T, double>::value));
};
template <class T>
struct some_traits {
typedef typename T::does_not_exist type;
};
template <>
struct some_traits<int> {
typedef bool type;
};
template <>
struct some_traits<double> {
typedef bool type;
};
template <class T>
struct make_bool {
typedef bool type;
};
template <>
struct make_bool<int> {};
template <>
struct make_bool<double> {};
namespace A {
template<class T>
typename lazy_enable_if<is_int_or_double<T>, some_traits<T> >::type
foo(T t) { return true; }
template<class T>
typename lazy_enable_if_c<is_int_or_double<T>::value, some_traits<T> >::type
foo2(T t) { return true; }
}
namespace B {
template<class T>
typename lazy_disable_if<is_int_or_double<T>, make_bool<T> >::type
foo(T t) { return false; }
template<class T>
typename lazy_disable_if_c<is_int_or_double<T>::value, make_bool<T> >::type
foo2(T t) { return false; }
}
int test_main(int, char*[])
{
using namespace A;
using namespace B;
BOOST_CHECK(foo(1));
BOOST_CHECK(foo(1.0));
BOOST_CHECK(!foo("1"));
BOOST_CHECK(!foo(static_cast<void*>(0)));
BOOST_CHECK(foo2(1));
BOOST_CHECK(foo2(1.0));
BOOST_CHECK(!foo2("1"));
BOOST_CHECK(!foo2(static_cast<void*>(0)));
return 0;
}

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// Boost enable_if library
// Copyright 2003 (c) The Trustees of Indiana University.
// Use, modification, and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
// Authors: Jaakko J<>rvi (jajarvi at osl.iu.edu)
// Jeremiah Willcock (jewillco at osl.iu.edu)
// Andrew Lumsdaine (lums at osl.iu.edu)
#include <boost/test/minimal.hpp>
#include <boost/utility/enable_if.hpp>
#include <boost/type_traits/is_arithmetic.hpp>
using boost::enable_if;
using boost::disable_if;
using boost::is_arithmetic;
struct container {
template <class T>
typename enable_if<is_arithmetic<T>, bool>::type
arithmetic_object(const T&, const int* /* disambiguate */ = 0) {return true;}
template <class T>
typename disable_if<is_arithmetic<T>, bool>::type
arithmetic_object(const T&) {return false;}
};
int test_main(int, char*[])
{
BOOST_CHECK(container().arithmetic_object(1));
BOOST_CHECK(container().arithmetic_object(1.0));
BOOST_CHECK(!container().arithmetic_object("1"));
BOOST_CHECK(!container().arithmetic_object(static_cast<void*>(0)));
return 0;
}

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// Boost enable_if library
// Copyright 2003 (c) The Trustees of Indiana University.
// Use, modification, and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
// Authors: Jaakko J<>rvi (jajarvi at osl.iu.edu)
// Jeremiah Willcock (jewillco at osl.iu.edu)
// Andrew Lumsdaine (lums at osl.iu.edu)
#include <boost/test/minimal.hpp>
#include <boost/mpl/not.hpp>
#include <boost/utility/enable_if.hpp>
#include <boost/type_traits/is_arithmetic.hpp>
using boost::enable_if;
using boost::mpl::not_;
using boost::is_arithmetic;
namespace A {
template<class T>
typename enable_if<is_arithmetic<T>, bool>::type
arithmetic_object(T t) { return true; }
}
namespace B {
template<class T>
typename enable_if<not_<is_arithmetic<T> >, bool>::type
arithmetic_object(T t) { return false; }
}
int test_main(int, char*[])
{
using namespace A;
using namespace B;
BOOST_CHECK(arithmetic_object(1));
BOOST_CHECK(arithmetic_object(1.0));
BOOST_CHECK(!arithmetic_object("1"));
BOOST_CHECK(!arithmetic_object(static_cast<void*>(0)));
return 0;
}

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// Boost enable_if library
// Copyright 2003 (c) The Trustees of Indiana University.
// Use, modification, and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
// Authors: Jaakko J<>rvi (jajarvi at osl.iu.edu)
// Jeremiah Willcock (jewillco at osl.iu.edu)
// Andrew Lumsdaine (lums at osl.iu.edu)
#include <boost/test/minimal.hpp>
#include <boost/mpl/not.hpp>
#include <boost/utility/enable_if.hpp>
#include <boost/type_traits/is_arithmetic.hpp>
using boost::mpl::not_;
using boost::enable_if;
using boost::is_arithmetic;
template<class T>
typename enable_if<is_arithmetic<T>, bool>::type
arithmetic_object(T t) { return true; }
template<class T>
typename enable_if<not_<is_arithmetic<T> >, bool>::type
arithmetic_object(T t) { return false; }
int test_main(int, char*[])
{
BOOST_CHECK(arithmetic_object(1));
BOOST_CHECK(arithmetic_object(1.0));
BOOST_CHECK(!arithmetic_object("1"));
BOOST_CHECK(!arithmetic_object(static_cast<void*>(0)));
return 0;
}

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// Boost enable_if library
// Copyright 2003 (c) The Trustees of Indiana University.
// Use, modification, and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
// Authors: Jaakko J<>rvi (jajarvi at osl.iu.edu)
// Jeremiah Willcock (jewillco at osl.iu.edu)
// Andrew Lumsdaine (lums at osl.iu.edu)
#include <boost/test/minimal.hpp>
#include <boost/utility/enable_if.hpp>
#include <boost/type_traits/is_arithmetic.hpp>
using boost::enable_if_c;
using boost::disable_if_c;
using boost::enable_if;
using boost::disable_if;
using boost::is_arithmetic;
template <class T, class Enable = void>
struct tester;
template <class T>
struct tester<T, typename enable_if_c<is_arithmetic<T>::value>::type> {
BOOST_STATIC_CONSTANT(bool, value = true);
};
template <class T>
struct tester<T, typename disable_if_c<is_arithmetic<T>::value>::type> {
BOOST_STATIC_CONSTANT(bool, value = false);
};
template <class T, class Enable = void>
struct tester2;
template <class T>
struct tester2<T, typename enable_if<is_arithmetic<T> >::type> {
BOOST_STATIC_CONSTANT(bool, value = true);
};
template <class T>
struct tester2<T, typename disable_if<is_arithmetic<T> >::type> {
BOOST_STATIC_CONSTANT(bool, value = false);
};
int test_main(int, char*[])
{
BOOST_CHECK(tester<int>::value);
BOOST_CHECK(tester<double>::value);
BOOST_CHECK(!tester<char*>::value);
BOOST_CHECK(!tester<void*>::value);
BOOST_CHECK(tester2<int>::value);
BOOST_CHECK(tester2<double>::value);
BOOST_CHECK(!tester2<char*>::value);
BOOST_CHECK(!tester2<void*>::value);
return 0;
}

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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<h1>Generator Iterator Adaptor</h1>
<p>Defined in header <a href=
"../../boost/generator_iterator.hpp">boost/generator_iterator.hpp</a></p>
<p>The generator iterator adaptor makes it easier to create custom input
iterators from 0-ary functions and function objects. The adaptor takes a
<a href="http://www.sgi.com/tech/stl/Generator.html">Generator</a> and
creates a model of <a href=
"http://www.sgi.com/tech/stl/InputIterator.html">Input Iterator</a>. Each
increment retrieves an item from the generator and makes it available to be
retrieved by dereferencing. The motivation for this iterator is that some
concepts can be more naturally expressed as a generator, while most STL
algorithms expect an iterator. An example is the <a href=
"../random/index.html">Random Number</a> library.</p>
<h2>Synopsis</h2>
<blockquote>
<pre>
namespace boost {
template &lt;class Generator&gt;
class generator_iterator_policies;
template &lt;class Generator&gt;
class generator_iterator_generator;
template &lt;class Generator&gt;
typename generator_iterator_generator&lt;Generator&gt;::type
make_generator_iterator(Generator &amp; gen);
}
</pre>
</blockquote>
<hr>
<h2>The Generator Iterator Generator Class</h2>
<p>The class generator_iterator_generator is a helper class whose purpose
is to construct a generator iterator type. The template parameter for this
class is the Generator function object type that is being wrapped. The
generator iterator adaptor only holds a reference (or pointer) to the
function object, therefore the function object must outlive the generator
iterator adaptor constructed from it.</p>
<pre>
template &lt;class Generator&gt;
class generator_iterator_generator
{
public:
typedef <i>unspecified</i> type; // the resulting generator iterator type
}
</pre>
<h3>Template Parameters</h3>
<table border summary="">
<tr>
<th>Parameter</th>
<th>Description</th>
</tr>
<tr>
<td><tt><a href=
"http://www.sgi.com/tech/stl/Generator.html">Generator</a></tt></td>
<td>The generator (0-ary function object) type being wrapped. The
return type of the function must be defined as
<tt>Generator::result_type</tt>. The function object must be a model of
<a href=
"http://www.sgi.com/tech/stl/Generator.html">Generator</a>.</td>
</tr>
</table>
<h3>Concept Model</h3>
<p>The generator iterator class is a model of <a href=
"http://www.sgi.com/tech/stl/InputIterator.html">Input Iterator</a>.</p>
<h3>Members</h3>
<p>The generator iterator implements the member functions and operators
required of the <a href=
"http://www.sgi.com/tech/stl/InputIterator.html">Input Iterator</a>
concept.<br></p>
<hr>
<h2><a name="make_generator_iterator" id="make_generator_iterator">The
Generator Iterator Object Generator</a></h2>
<p>The <tt>make_generator_iterator()</tt> function provides a convenient
way to create generator iterator objects. The function saves the user the
trouble of explicitly writing out the iterator types.</p>
<blockquote>
<pre>
template &lt;class Generator&gt;
typename generator_iterator_generator&lt;Generator&gt;::type
make_generator_iterator(Generator &amp; gen);
</pre>
</blockquote>
<hr>
<h3>Example</h3>
<p>The following program shows how <code>generator_iterator</code>
transforms a generator into an input iterator.</p>
<blockquote>
<pre>
#include &lt;iostream&gt;
#include &lt;boost/generator_iterator.hpp&gt;
class my_generator
{
public:
typedef int result_type;
my_generator() : state(0) { }
int operator()() { return ++state; }
private:
int state;
};
int main()
{
my_generator gen;
boost::generator_iterator_generator&lt;my_generator&gt;::type it = boost::make_generator_iterator(gen);
for(int i = 0; i &lt; 10; ++i, ++it)
std::cout &lt;&lt; *it &lt;&lt; std::endl;
}
</pre>
</blockquote>
<hr>
<p><a href="http://validator.w3.org/check?uri=referer"><img border="0" src=
"http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01 Transitional"
height="31" width="88"></a></p>
<p>Revised
<!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %B, %Y" startspan -->05 December, 2006<!--webbot bot="Timestamp" endspan i-checksum="38516" --></p>
<p><i>Copyright &copy; 2001 <a href=
"http://www.boost.org/people/jens_maurer.htm">Jens Maurer</a></i></p>
<p><i>Distributed under the Boost Software License, Version 1.0. (See
accompanying file <a href="../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or
copy at <a href=
"http://www.boost.org/LICENSE_1_0.txt">http://www.boost.org/LICENSE_1_0.txt</a>)</i></p>
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<H2 align="left"><IMG SRC="../../boost.png" WIDTH="276" HEIGHT="86"></H2>
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<blockquote>
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<blockquote>
<H2 align="left">Header &lt;<A
HREF="../../boost/utility/in_place_factory.hpp">boost/utility/in_place_factory.hpp</A>&gt; </H2>
<H2 align="left">Header &lt;<A
HREF="../../boost/utility/typed_in_place_factory.hpp">boost/utility/typed_in_place_factory.hpp</A>&gt; </H2>
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<p>&nbsp;</p>
<H2>Contents</H2>
<DL CLASS="page-index">
<DT><A HREF="#mot">Motivation</A></DT>
<DT><A HREF="#framework">Framework</A></DT>
<DT><A HREF="#specification">Specification</A></DT>
<DT><A HREF="#container-usage">Container-side Usage</A></DT>
<DT><A HREF="#user-usage">User-side Usage</A></DT>
</DL>
<HR>
<H2><A NAME="mot"></A>Motivation</H2>
<p>Suppose we have a class</p>
<pre>struct X
{
X ( int, std:::string ) ;
} ;</pre>
<p>And a container for it which supports an empty state (that is, which can contain zero objects):</p>
<pre>struct C
{
C() : contained_(0) {}
~C() { delete contained_ ; }
X* contained_ ;
} ;</pre>
<p>A container designed to support an empty state typically doesn't require the contained type to be DefaultConstructible,
but it typically requires it to be CopyConstructible as a mechanism to
initialize the object to store:</p>
<pre>struct C
{
C() : contained_(0) {}
C ( X const& v ) : contained_ ( new X(v) ) {}
~C() { delete contained_ ; }
X* contained_ ;
} ;</pre>
<p>There is a subtle problem with this: since the mechanism used to initialize the stored object is copy construction,
there must exist a previously constructed source object to copy from. This
object is likely to be temporary and serve no purpose besides being the source</p>
<pre>void foo()
{
// Temporary object created.
C c( X(123,"hello") ) ;
}
</pre>
<p>A solution to this problem is to support direct construction of the contained
object right in the container's storage.<br>
In this scheme, the user supplies the arguments for the X constructor
directly to the container:</p>
<pre>struct C
{
C() : contained_(0) {}
C ( X const& v ) : contained_ ( new X(v) ) {}
C ( int a0, std::string a1 ) : contained_ ( new X(a0,a1) ) {}
~C() { delete contained_ ; }
X* contained_ ;
} ;</pre>
<pre>void foo()
{
// Wrapped object constructed in-place
// No temporary created.
C c(123,"hello") ;
}
</pre>
<p>Clearly, this solution doesn't scale well since the container must duplicate all the constructor overloads from the contained type
(at least all those which are to be supported directly in the container).</p>
<H2><A NAME="framework"></A>Framework</H2>
<p>
This library proposes a framework to allow some containers to directly contruct contained objects in-place without requiring
the entire set of constructor overloads ftom the contained type. It also allows the container to remove the CopyConstuctible
requirement from the contained type since objects can be directly constructed in-place without need of a copy.<br>
The only requirement on the container is that it must provide proper storage (that is, correctly aligned and sized).
Naturally, the container will typically support uninitialized storage to avoid the in-place construction to override
a fully-constructed object (as this would defeat the purpose of in-place construction)
</p>
<p>For this purpose, the framework provides two families of classes collectively called: InPlaceFactories and TypedInPlaceFactories.<br>
Essentially, these classes hold a sequence of actual parameters and a method to contruct an object in place using these parameters.
Each member of the family differs only in the number (and type) of the parameter list. The first family
takes the type of the object to construct directly in method provided for that
purpose, whereas the second family incorporates that type in the factory class
itself..</p>
<p>From the container POV, using the framework amounts to calling the factory's method to contruct the object in place.
From the user POV, it amounts to creating the right factory object to hold the parameters and pass it to the container.<br>
The following simplified example shows the basic idea. A complete example follows the formal specification of the framework:</p>
<pre>struct C
{
template&lt;class InPlaceFactory&gt;
C ( InPlaceFactory const& aFactoty )
:
contained_ ( uninitialized_storage() )
{
aFactory.template apply&lt;X&gt;(contained_);
}
~C()
{
contained_ -> X::~X();
delete[] contained_ ;
}
char* uninitialized_storage() { return new char[sizeof(X)] ; }
char* contained_ ;
} ;
void foo()
{
C c( in_place(123,"hello") ) ;
}
</pre>
<HR>
<H2><A NAME="specification">Specification</A></H2>
<p>The following is the first member of the family of 'in_place_factory' classes, along with its corresponding helper template function.
The rest of the family varies only in the number and type of template (and constructor) parameters.</p>
<PRE>namespace boost {
struct in_place_factory_base {} ;
template&lt;class A0&gt;
class in_place_factory : public in_place_factory_base
{
public:</PRE>
<PRE> in_place_factory ( A0 const& a0 ) : m_a0(a0) {}
template&lt; class T &gt;
void apply ( void* address ) const
{
new (address) T(m_a0);
}
private:</PRE>
<PRE> A0 const& m_a0 ;
} ;
template&lt;class A0&gt;
in_place_factory&lt;A0&gt; in_place ( A0 const& a0 )
{
return in_place_factory&lt;A0&gt;(a0);
}
</PRE>
<p>Similarly, the following is the first member of the family of 'typed_in_place_factory' classes, along with its corresponding
helper template function. The rest of the family varies only in the number and type of template (and constructor) parameters.</p>
<PRE>namespace boost {
struct typed_in_place_factory_base {} ;
template&lt;class T, class A0&gt;
class typed_in_place_factory : public typed_in_place_factory_base
{
public:</PRE>
<PRE> typed_in_place_factory ( A0 const& a0 ) : m_a0(a0) {}
void apply ( void* address ) const
{
new (address) T(m_a0);
}
private:</PRE>
<PRE> A0 const& m_a0 ;
} ;
template&lt;class T, class A0&gt;
typed_in_place_factory&lt;A0&gt; in_place ( A0 const& a0 )
{
return typed_in_place_factory&lt;T,A0&gt;(a0);
}</PRE>
<PRE>}
</PRE>
<p>As you can see, the 'in_place_factory' and 'typed_in_place_factory' template classes varies only in the way they specify
the target type: in the first family, the type is given as a template argument to the apply member function while in the
second it is given directly as part of the factory class.<br>
When the container holds a unique non-polymorphic type (such as the case of Boost.Optional), it knows the exact dynamic-type
of the contained object and can pass it to the apply() method of a (non-typed) factory.
In this case, end users can use an 'in_place_factory' instance which can be constructed without the type of the object to construct.<br>
However, if the container holds heterogeneous or polymorphic objects (such as the case of Boost.Variant), the dynamic-type
of the object to be constructed must be known by the factory itslef. In this case, end users must use a 'typed_in_place_factory'
instead.</p>
<HR>
<h2><A NAME="container-usage">Container-side Usage</a></h2>
<p>As shown in the introductory simplified example, the container class must
contain methods that accept an instance of
these factories and pass the object's storage to the factory's apply method.<br>
However, the type of the factory class cannot be completly specified in the container class because that would
defeat the whole purpose of the factories which is to allow the container to accept a variadic argument list
for the constructor of its contained object.<br>
The correct function overload must be based on the only distinctive and common
characteristic of all the classes in each family, the base class.<br>
Depending on the container class, you can use 'enable_if' to generate the right overload, or use the following
dispatch technique (used in the Boost.Optional class):
</p>
<pre>struct C
{
C() : contained_(0) {}
C ( X const& v ) : contained_ ( new X(v) ) {}
template&lt;class Expr&gt
C ( Expr const& expr )
:
contained_ ( uninitialized_storage() )
{
construct(expr,&expr)
}
~C() { delete contained_ ; }
template&lt;class InPlaceFactory&gt;
void construct ( InPlaceFactory const& aFactory, boost::in_place_factory_base* )
{
aFactory.template apply&lt;X&gt;(contained_);
}
template&lt;class TypedInPlaceFactory&gt;
void construct ( TypedInPlaceFactory const& aFactory, boost::typed_in_place_factory_base* )
{
aFactory.apply(contained_);
}
X* uninitialized_storage() { return static_cast&lt;X*&gt;(new char[sizeof(X)]) ; }
X* contained_ ;
} ;
</pre>
<hr>
<h2><A NAME="user-usage">User-side Usage</a></h2>
<p>End users pass to the container an instance of a factory object holding the actual parameters needed to construct the
contained object directly within the container. For this, the helper template function 'in_place' is used.<br>
The call 'in_place(a0,a1,a2,...,an)' constructs a (non-typed) 'in_place_factory' instance with the given argument list.<br>
The call 'in_place&lt;T&gt;(a0,a1,a2,...,an)' constructs a 'typed_in_place_factory' instance with the given argument list for the
type 'T'.</p>
<pre>void foo()
{
C a( in_place(123,"hello") ) ; // in_place_factory passed
C b( in_place&lt;X&gt;(456,"world") ) ; // typed_in_place_factory passed
}
</pre>
<P>Revised September 17, 2004</P>
<p><EFBFBD> Copyright Fernando Luis Cacciola Carballal, 2004</p>
<p> Use, modification, and distribution are subject to the Boost Software
License, Version 1.0. (See accompanying file <a href="../../LICENSE_1_0.txt">
LICENSE_1_0.txt</a> or copy at <a href="http://www.boost.org/LICENSE_1_0.txt">
www.boost.org/LICENSE_1_0.txt</a>)</p>
<P>Developed by <A HREF="mailto:fernando_cacciola@hotmail.com">Fernando Cacciola</A>,
the latest version of this file can be found at <A
HREF="http://www.boost.org">www.boost.org</A>, and the boost
<A HREF="http://www.boost.org/more/mailing_lists.htm#main">discussion lists</A></P>
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include/boost/assert.hpp Normal file
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//
// boost/assert.hpp - BOOST_ASSERT(expr)
//
// Copyright (c) 2001, 2002 Peter Dimov and Multi Media Ltd.
// Copyright (c) 2007 Peter Dimov
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// Note: There are no include guards. This is intentional.
//
// See http://www.boost.org/libs/utility/assert.html for documentation.
//
#undef BOOST_ASSERT
#if defined(BOOST_DISABLE_ASSERTS)
# define BOOST_ASSERT(expr) ((void)0)
#elif defined(BOOST_ENABLE_ASSERT_HANDLER)
#include <boost/current_function.hpp>
namespace boost
{
void assertion_failed(char const * expr, char const * function, char const * file, long line); // user defined
} // namespace boost
#define BOOST_ASSERT(expr) ((expr)? ((void)0): ::boost::assertion_failed(#expr, BOOST_CURRENT_FUNCTION, __FILE__, __LINE__))
#else
# include <assert.h> // .h to support old libraries w/o <cassert> - effect is the same
# define BOOST_ASSERT(expr) assert(expr)
#endif
#undef BOOST_VERIFY
#if defined(BOOST_DISABLE_ASSERTS) || ( !defined(BOOST_ENABLE_ASSERT_HANDLER) && defined(NDEBUG) )
# define BOOST_VERIFY(expr) ((void)(expr))
#else
# define BOOST_VERIFY(expr) BOOST_ASSERT(expr)
#endif

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@ -1,9 +1,10 @@
// (C) Copyright Boost.org 2000. Permission to copy, use, modify, sell and
// distribute this software is granted provided this copyright notice appears
// in all copies. This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
// (C) Copyright Steve Cleary, Beman Dawes, Howard Hinnant & John Maddock 2000.
// Use, modification and distribution are subject to the Boost Software License,
// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt).
//
// See http://www.boost.org/libs/utility for most recent version including documentation.
// See http://www.boost.org for most recent version including documentation.
// See boost/detail/call_traits.hpp and boost/detail/ob_call_traits.hpp
// for full copyright notices.

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@ -0,0 +1,69 @@
#ifndef BOOST_CHECKED_DELETE_HPP_INCLUDED
#define BOOST_CHECKED_DELETE_HPP_INCLUDED
// MS compatible compilers support #pragma once
#if defined(_MSC_VER) && (_MSC_VER >= 1020)
# pragma once
#endif
//
// boost/checked_delete.hpp
//
// Copyright (c) 2002, 2003 Peter Dimov
// Copyright (c) 2003 Daniel Frey
// Copyright (c) 2003 Howard Hinnant
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// See http://www.boost.org/libs/utility/checked_delete.html for documentation.
//
namespace boost
{
// verify that types are complete for increased safety
template<class T> inline void checked_delete(T * x)
{
// intentionally complex - simplification causes regressions
typedef char type_must_be_complete[ sizeof(T)? 1: -1 ];
(void) sizeof(type_must_be_complete);
delete x;
}
template<class T> inline void checked_array_delete(T * x)
{
typedef char type_must_be_complete[ sizeof(T)? 1: -1 ];
(void) sizeof(type_must_be_complete);
delete [] x;
}
template<class T> struct checked_deleter
{
typedef void result_type;
typedef T * argument_type;
void operator()(T * x) const
{
// boost:: disables ADL
boost::checked_delete(x);
}
};
template<class T> struct checked_array_deleter
{
typedef void result_type;
typedef T * argument_type;
void operator()(T * x) const
{
boost::checked_array_delete(x);
}
};
} // namespace boost
#endif // #ifndef BOOST_CHECKED_DELETE_HPP_INCLUDED

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@ -1,9 +1,10 @@
// (C) Copyright Boost.org 2000. Permission to copy, use, modify, sell and
// distribute this software is granted provided this copyright notice appears
// in all copies. This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
// (C) Copyright Steve Cleary, Beman Dawes, Howard Hinnant & John Maddock 2000.
// Use, modification and distribution are subject to the Boost Software License,
// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt).
//
// See http://www.boost.org/libs/utility for most recent version including documentation.
// See http://www.boost.org for most recent version including documentation.
// See boost/detail/compressed_pair.hpp and boost/detail/ob_compressed_pair.hpp
// for full copyright notices.

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@ -0,0 +1,67 @@
#ifndef BOOST_CURRENT_FUNCTION_HPP_INCLUDED
#define BOOST_CURRENT_FUNCTION_HPP_INCLUDED
// MS compatible compilers support #pragma once
#if defined(_MSC_VER) && (_MSC_VER >= 1020)
# pragma once
#endif
//
// boost/current_function.hpp - BOOST_CURRENT_FUNCTION
//
// Copyright (c) 2002 Peter Dimov and Multi Media Ltd.
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// http://www.boost.org/libs/utility/current_function.html
//
namespace boost
{
namespace detail
{
inline void current_function_helper()
{
#if defined(__GNUC__) || (defined(__MWERKS__) && (__MWERKS__ >= 0x3000)) || (defined(__ICC) && (__ICC >= 600))
# define BOOST_CURRENT_FUNCTION __PRETTY_FUNCTION__
#elif defined(__DMC__) && (__DMC__ >= 0x810)
# define BOOST_CURRENT_FUNCTION __PRETTY_FUNCTION__
#elif defined(__FUNCSIG__)
# define BOOST_CURRENT_FUNCTION __FUNCSIG__
#elif (defined(__INTEL_COMPILER) && (__INTEL_COMPILER >= 600)) || (defined(__IBMCPP__) && (__IBMCPP__ >= 500))
# define BOOST_CURRENT_FUNCTION __FUNCTION__
#elif defined(__BORLANDC__) && (__BORLANDC__ >= 0x550)
# define BOOST_CURRENT_FUNCTION __FUNC__
#elif defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901)
# define BOOST_CURRENT_FUNCTION __func__
#else
# define BOOST_CURRENT_FUNCTION "(unknown)"
#endif
}
} // namespace detail
} // namespace boost
#endif // #ifndef BOOST_CURRENT_FUNCTION_HPP_INCLUDED

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@ -1,10 +1,9 @@
// (C) Copyright Steve Cleary, Beman Dawes, Howard Hinnant & John Maddock 2000.
// Permission to copy, use, modify, sell and
// distribute this software is granted provided this copyright notice appears
// in all copies. This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
// See http://www.boost.org for most recent version including documentation.
// Use, modification and distribution are subject to the Boost Software License,
// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt).
//
// See http://www.boost.org/libs/utility for most recent version including documentation.
// call_traits: defines typedefs for function usage
// (see libs/utility/call_traits.htm)
@ -22,31 +21,44 @@
#ifndef BOOST_CONFIG_HPP
#include <boost/config.hpp>
#endif
#include <cstddef>
#ifndef BOOST_TYPE_TRAITS_HPP
#include <boost/type_traits.hpp>
#endif
#include <boost/type_traits/is_arithmetic.hpp>
#include <boost/type_traits/is_pointer.hpp>
#include <boost/detail/workaround.hpp>
namespace boost{
namespace detail{
template <typename T, bool isp, bool b1, bool b2>
template <typename T, bool small_>
struct ct_imp2
{
typedef const T& param_type;
};
template <typename T>
struct ct_imp2<T, true>
{
typedef const T param_type;
};
template <typename T, bool isp, bool b1>
struct ct_imp
{
typedef const T& param_type;
};
template <typename T, bool isp>
struct ct_imp<T, isp, true, true>
struct ct_imp<T, isp, true>
{
typedef T const param_type;
typedef typename ct_imp2<T, sizeof(T) <= sizeof(void*)>::param_type param_type;
};
template <typename T, bool b1, bool b2>
struct ct_imp<T, true, b1, b2>
template <typename T, bool b1>
struct ct_imp<T, true, b1>
{
typedef T const param_type;
typedef const T param_type;
};
}
@ -64,7 +76,11 @@ public:
// however compiler bugs prevent this - instead pass three bool's to
// ct_imp<T,bool,bool,bool> and add an extra partial specialisation
// of ct_imp to handle the logic. (JM)
typedef typename detail::ct_imp<T, ::boost::is_pointer<typename remove_const<T>::type>::value, ::boost::is_arithmetic<typename remove_const<T>::type>::value, sizeof(T) <= sizeof(void*)>::param_type param_type;
typedef typename boost::detail::ct_imp<
T,
::boost::is_pointer<T>::value,
::boost::is_arithmetic<T>::value
>::param_type param_type;
};
template <typename T>
@ -76,7 +92,7 @@ struct call_traits<T&>
typedef T& param_type; // hh removed const
};
#if defined(__BORLANDC__) && (__BORLANDC__ <= 0x551)
#if BOOST_WORKAROUND( __BORLANDC__, BOOST_TESTED_AT( 0x581 ) )
// these are illegal specialisations; cv-qualifies applied to
// references have no effect according to [8.3.2p1],
// C++ Builder requires them though as it treats cv-qualified
@ -105,8 +121,17 @@ struct call_traits<T&const volatile>
typedef const T& const_reference;
typedef T& param_type; // hh removed const
};
#endif
template <typename T>
struct call_traits< T * >
{
typedef T * value_type;
typedef T * & reference;
typedef T * const & const_reference;
typedef T * const param_type; // hh removed const
};
#endif
#if !defined(BOOST_NO_ARRAY_TYPE_SPECIALIZATIONS)
template <typename T, std::size_t N>
struct call_traits<T [N]>
{
@ -132,6 +157,7 @@ public:
typedef const array_type& const_reference;
typedef const T* const param_type;
};
#endif
}

View File

@ -1,14 +1,16 @@
// (C) Copyright Steve Cleary, Beman Dawes, Howard Hinnant & John Maddock 2000.
// Permission to copy, use, modify, sell and
// distribute this software is granted provided this copyright notice appears
// in all copies. This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
// See http://www.boost.org for most recent version including documentation.
// Use, modification and distribution are subject to the Boost Software License,
// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt).
//
// See http://www.boost.org/libs/utility for most recent version including documentation.
// compressed_pair: pair that "compresses" empty members
// (see libs/utility/compressed_pair.htm)
//
// JM changes 25 Jan 2004:
// For the case where T1 == T2 and both are empty, then first() and second()
// should return different objects.
// JM changes 25 Jan 2000:
// Removed default arguments from compressed_pair_switch to get
// C++ Builder 4 to accept them
@ -19,16 +21,23 @@
#define BOOST_DETAIL_COMPRESSED_PAIR_HPP
#include <algorithm>
#ifndef BOOST_TYPE_TRAITS_HPP
#include <boost/type_traits.hpp>
#endif
#ifndef BOOST_CALL_TRAITS_HPP
#include <boost/call_traits.hpp>
#endif
#include <boost/type_traits/remove_cv.hpp>
#include <boost/type_traits/is_empty.hpp>
#include <boost/type_traits/is_same.hpp>
#include <boost/call_traits.hpp>
#ifdef BOOST_MSVC
# pragma warning(push)
# pragma warning(disable:4512)
#endif
namespace boost
{
template <class T1, class T2>
class compressed_pair;
// compressed_pair
namespace details
@ -75,7 +84,9 @@ namespace details
template <typename T>
inline void cp_swap(T& t1, T& t2)
{
#ifndef __GNUC__
using std::swap;
#endif
swap(t1, t2);
}
@ -99,10 +110,10 @@ namespace details
compressed_pair_imp(first_param_type x, second_param_type y)
: first_(x), second_(y) {}
explicit compressed_pair_imp(first_param_type x)
compressed_pair_imp(first_param_type x)
: first_(x) {}
explicit compressed_pair_imp(second_param_type y)
compressed_pair_imp(second_param_type y)
: second_(y) {}
first_reference first() {return first_;}
@ -111,10 +122,10 @@ namespace details
second_reference second() {return second_;}
second_const_reference second() const {return second_;}
void swap(compressed_pair_imp& y)
void swap(::boost::compressed_pair<T1, T2>& y)
{
cp_swap(first_, y.first_);
cp_swap(second_, y.second_);
cp_swap(first_, y.first());
cp_swap(second_, y.second());
}
private:
first_type first_;
@ -125,7 +136,7 @@ namespace details
template <class T1, class T2>
class compressed_pair_imp<T1, T2, 1>
: private T1
: protected ::boost::remove_cv<T1>::type
{
public:
typedef T1 first_type;
@ -142,10 +153,10 @@ namespace details
compressed_pair_imp(first_param_type x, second_param_type y)
: first_type(x), second_(y) {}
explicit compressed_pair_imp(first_param_type x)
compressed_pair_imp(first_param_type x)
: first_type(x) {}
explicit compressed_pair_imp(second_param_type y)
compressed_pair_imp(second_param_type y)
: second_(y) {}
first_reference first() {return *this;}
@ -154,10 +165,10 @@ namespace details
second_reference second() {return second_;}
second_const_reference second() const {return second_;}
void swap(compressed_pair_imp& y)
void swap(::boost::compressed_pair<T1,T2>& y)
{
// no need to swap empty base class:
cp_swap(second_, y.second_);
cp_swap(second_, y.second());
}
private:
second_type second_;
@ -167,7 +178,7 @@ namespace details
template <class T1, class T2>
class compressed_pair_imp<T1, T2, 2>
: private T2
: protected ::boost::remove_cv<T2>::type
{
public:
typedef T1 first_type;
@ -184,10 +195,10 @@ namespace details
compressed_pair_imp(first_param_type x, second_param_type y)
: second_type(y), first_(x) {}
explicit compressed_pair_imp(first_param_type x)
compressed_pair_imp(first_param_type x)
: first_(x) {}
explicit compressed_pair_imp(second_param_type y)
compressed_pair_imp(second_param_type y)
: second_type(y) {}
first_reference first() {return first_;}
@ -196,10 +207,10 @@ namespace details
second_reference second() {return *this;}
second_const_reference second() const {return *this;}
void swap(compressed_pair_imp& y)
void swap(::boost::compressed_pair<T1,T2>& y)
{
// no need to swap empty base class:
cp_swap(first_, y.first_);
cp_swap(first_, y.first());
}
private:
@ -210,8 +221,8 @@ namespace details
template <class T1, class T2>
class compressed_pair_imp<T1, T2, 3>
: private T1,
private T2
: protected ::boost::remove_cv<T1>::type,
protected ::boost::remove_cv<T2>::type
{
public:
typedef T1 first_type;
@ -228,10 +239,10 @@ namespace details
compressed_pair_imp(first_param_type x, second_param_type y)
: first_type(x), second_type(y) {}
explicit compressed_pair_imp(first_param_type x)
compressed_pair_imp(first_param_type x)
: first_type(x) {}
explicit compressed_pair_imp(second_param_type y)
compressed_pair_imp(second_param_type y)
: second_type(y) {}
first_reference first() {return *this;}
@ -241,16 +252,19 @@ namespace details
second_const_reference second() const {return *this;}
//
// no need to swap empty bases:
void swap(compressed_pair_imp&) {}
void swap(::boost::compressed_pair<T1,T2>&) {}
};
// JM
// 4 T1 == T2, T1 and T2 both empty
// Note does not actually store an instance of T2 at all -
// but reuses T1 base class for both first() and second().
// Originally this did not store an instance of T2 at all
// but that led to problems beause it meant &x.first() == &x.second()
// which is not true for any other kind of pair, so now we store an instance
// of T2 just in case the user is relying on first() and second() returning
// different objects (albeit both empty).
template <class T1, class T2>
class compressed_pair_imp<T1, T2, 4>
: private T1
: protected ::boost::remove_cv<T1>::type
{
public:
typedef T1 first_type;
@ -264,20 +278,21 @@ namespace details
compressed_pair_imp() {}
compressed_pair_imp(first_param_type x, second_param_type)
: first_type(x) {}
compressed_pair_imp(first_param_type x, second_param_type y)
: first_type(x), m_second(y) {}
explicit compressed_pair_imp(first_param_type x)
: first_type(x) {}
compressed_pair_imp(first_param_type x)
: first_type(x), m_second(x) {}
first_reference first() {return *this;}
first_const_reference first() const {return *this;}
second_reference second() {return *this;}
second_const_reference second() const {return *this;}
second_reference second() {return m_second;}
second_const_reference second() const {return m_second;}
void swap(compressed_pair_imp&) {}
void swap(::boost::compressed_pair<T1,T2>&) {}
private:
T2 m_second;
};
// 5 T1 == T2 and are not empty: //JM
@ -300,7 +315,7 @@ namespace details
compressed_pair_imp(first_param_type x, second_param_type y)
: first_(x), second_(y) {}
explicit compressed_pair_imp(first_param_type x)
compressed_pair_imp(first_param_type x)
: first_(x), second_(x) {}
first_reference first() {return first_;}
@ -309,10 +324,10 @@ namespace details
second_reference second() {return second_;}
second_const_reference second() const {return second_;}
void swap(compressed_pair_imp<T1, T2, 5>& y)
void swap(::boost::compressed_pair<T1, T2>& y)
{
cp_swap(first_, y.first_);
cp_swap(second_, y.second_);
cp_swap(first_, y.first());
cp_swap(second_, y.second());
}
private:
first_type first_;
@ -396,7 +411,10 @@ public:
compressed_pair() : base() {}
compressed_pair(first_param_type x, second_param_type y) : base(x, y) {}
explicit compressed_pair(first_param_type x) : base(x) {}
#if !(defined(__SUNPRO_CC) && (__SUNPRO_CC <= 0x530))
explicit
#endif
compressed_pair(first_param_type x) : base(x) {}
first_reference first() {return base::first();}
first_const_reference first() const {return base::first();}
@ -404,7 +422,7 @@ public:
second_reference second() {return base::second();}
second_const_reference second() const {return base::second();}
void swap(compressed_pair& y) { base::swap(y); }
void swap(::boost::compressed_pair<T,T>& y) { base::swap(y); }
};
template <class T1, class T2>
@ -417,6 +435,9 @@ swap(compressed_pair<T1, T2>& x, compressed_pair<T1, T2>& y)
} // boost
#ifdef BOOST_MSVC
# pragma warning(pop)
#endif
#endif // BOOST_DETAIL_COMPRESSED_PAIR_HPP

View File

@ -1,14 +1,21 @@
// (C) Copyright Steve Cleary, Beman Dawes, Howard Hinnant & John Maddock 2000.
// Permission to copy, use, modify, sell and
// distribute this software is granted provided this copyright notice appears
// in all copies. This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
// See http://www.boost.org for most recent version including documentation.
// Use, modification and distribution are subject to the Boost Software License,
// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt).
//
// See http://www.boost.org/libs/utility for most recent version including documentation.
//
// Crippled version for crippled compilers:
// see libs/utility/call_traits.htm
//
/* Release notes:
01st October 2000:
Fixed call_traits on VC6, using "poor man's partial specialisation",
using ideas taken from "Generative programming" by Krzysztof Czarnecki
& Ulrich Eisenecker.
*/
#ifndef BOOST_OB_CALL_TRAITS_HPP
#define BOOST_OB_CALL_TRAITS_HPP
@ -16,12 +23,135 @@
#include <boost/config.hpp>
#endif
#ifndef BOOST_TYPE_TRAITS_HPP
#include <boost/type_traits.hpp>
#ifndef BOOST_ARITHMETIC_TYPE_TRAITS_HPP
#include <boost/type_traits/arithmetic_traits.hpp>
#endif
#ifndef BOOST_COMPOSITE_TYPE_TRAITS_HPP
#include <boost/type_traits/composite_traits.hpp>
#endif
namespace boost{
#ifdef BOOST_MSVC6_MEMBER_TEMPLATES
//
// use member templates to emulate
// partial specialisation:
//
namespace detail{
template <class T>
struct standard_call_traits
{
typedef T value_type;
typedef T& reference;
typedef const T& const_reference;
typedef const T& param_type;
};
template <class T>
struct simple_call_traits
{
typedef T value_type;
typedef T& reference;
typedef const T& const_reference;
typedef const T param_type;
};
template <class T>
struct reference_call_traits
{
typedef T value_type;
typedef T reference;
typedef T const_reference;
typedef T param_type;
};
template <bool pointer, bool arithmetic, bool reference>
struct call_traits_chooser
{
template <class T>
struct rebind
{
typedef standard_call_traits<T> type;
};
};
template <>
struct call_traits_chooser<true, false, false>
{
template <class T>
struct rebind
{
typedef simple_call_traits<T> type;
};
};
template <>
struct call_traits_chooser<false, false, true>
{
template <class T>
struct rebind
{
typedef reference_call_traits<T> type;
};
};
template <bool size_is_small>
struct call_traits_sizeof_chooser2
{
template <class T>
struct small_rebind
{
typedef simple_call_traits<T> small_type;
};
};
template<>
struct call_traits_sizeof_chooser2<false>
{
template <class T>
struct small_rebind
{
typedef standard_call_traits<T> small_type;
};
};
template <>
struct call_traits_chooser<false, true, false>
{
template <class T>
struct rebind
{
enum { sizeof_choice = (sizeof(T) <= sizeof(void*)) };
typedef call_traits_sizeof_chooser2<(sizeof(T) <= sizeof(void*))> chooser;
typedef typename chooser::template small_rebind<T> bound_type;
typedef typename bound_type::small_type type;
};
};
} // namespace detail
template <typename T>
struct call_traits
{
private:
typedef detail::call_traits_chooser<
::boost::is_pointer<T>::value,
::boost::is_arithmetic<T>::value,
::boost::is_reference<T>::value
> chooser;
typedef typename chooser::template rebind<T> bound_type;
typedef typename bound_type::type call_traits_type;
public:
typedef typename call_traits_type::value_type value_type;
typedef typename call_traits_type::reference reference;
typedef typename call_traits_type::const_reference const_reference;
typedef typename call_traits_type::param_type param_type;
};
#else
//
// sorry call_traits is completely non-functional
// blame your broken compiler:
//
template <typename T>
struct call_traits
{
@ -31,6 +161,8 @@ struct call_traits
typedef const T& param_type;
};
#endif // member templates
}
#endif // BOOST_OB_CALL_TRAITS_HPP

View File

@ -1,13 +1,18 @@
// (C) Copyright Steve Cleary, Beman Dawes, Howard Hinnant & John Maddock 2000.
// Permission to copy, use, modify, sell and
// distribute this software is granted provided this copyright notice appears
// in all copies. This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
// See http://www.boost.org for most recent version including documentation.
// Use, modification and distribution are subject to the Boost Software License,
// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt).
//
// See http://www.boost.org/libs/utility for most recent version including documentation.
// see libs/utility/compressed_pair.hpp
//
/* Release notes:
20 Jan 2001:
Fixed obvious bugs (David Abrahams)
07 Oct 2000:
Added better single argument constructor support.
03 Oct 2000:
Added VC6 support (JM).
23rd July 2000:
Additional comments added. (JM)
Jan 2000:
@ -20,8 +25,11 @@
#define BOOST_OB_COMPRESSED_PAIR_HPP
#include <algorithm>
#ifndef BOOST_TYPE_TRAITS_HPP
#include <boost/type_traits.hpp>
#ifndef BOOST_OBJECT_TYPE_TRAITS_HPP
#include <boost/type_traits/object_traits.hpp>
#endif
#ifndef BOOST_SAME_TRAITS_HPP
#include <boost/type_traits/same_traits.hpp>
#endif
#ifndef BOOST_CALL_TRAITS_HPP
#include <boost/call_traits.hpp>
@ -29,6 +37,426 @@
namespace boost
{
#ifdef BOOST_MSVC6_MEMBER_TEMPLATES
//
// use member templates to emulate
// partial specialisation. Note that due to
// problems with overload resolution with VC6
// each of the compressed_pair versions that follow
// have one template single-argument constructor
// in place of two specific constructors:
//
template <class T1, class T2>
class compressed_pair;
namespace detail{
template <class A, class T1, class T2>
struct best_conversion_traits
{
typedef char one;
typedef char (&two)[2];
static A a;
static one test(T1);
static two test(T2);
enum { value = sizeof(test(a)) };
};
template <int>
struct init_one;
template <>
struct init_one<1>
{
template <class A, class T1, class T2>
static void init(const A& a, T1* p1, T2*)
{
*p1 = a;
}
};
template <>
struct init_one<2>
{
template <class A, class T1, class T2>
static void init(const A& a, T1*, T2* p2)
{
*p2 = a;
}
};
// T1 != T2, both non-empty
template <class T1, class T2>
class compressed_pair_0
{
private:
T1 _first;
T2 _second;
public:
typedef T1 first_type;
typedef T2 second_type;
typedef typename call_traits<first_type>::param_type first_param_type;
typedef typename call_traits<second_type>::param_type second_param_type;
typedef typename call_traits<first_type>::reference first_reference;
typedef typename call_traits<second_type>::reference second_reference;
typedef typename call_traits<first_type>::const_reference first_const_reference;
typedef typename call_traits<second_type>::const_reference second_const_reference;
compressed_pair_0() : _first(), _second() {}
compressed_pair_0(first_param_type x, second_param_type y) : _first(x), _second(y) {}
template <class A>
explicit compressed_pair_0(const A& val)
{
init_one<best_conversion_traits<A, T1, T2>::value>::init(val, &_first, &_second);
}
compressed_pair_0(const ::boost::compressed_pair<T1,T2>& x)
: _first(x.first()), _second(x.second()) {}
#if 0
compressed_pair_0& operator=(const compressed_pair_0& x) {
cout << "assigning compressed pair 0" << endl;
_first = x._first;
_second = x._second;
cout << "finished assigning compressed pair 0" << endl;
return *this;
}
#endif
first_reference first() { return _first; }
first_const_reference first() const { return _first; }
second_reference second() { return _second; }
second_const_reference second() const { return _second; }
void swap(compressed_pair_0& y)
{
using std::swap;
swap(_first, y._first);
swap(_second, y._second);
}
};
// T1 != T2, T2 empty
template <class T1, class T2>
class compressed_pair_1 : T2
{
private:
T1 _first;
public:
typedef T1 first_type;
typedef T2 second_type;
typedef typename call_traits<first_type>::param_type first_param_type;
typedef typename call_traits<second_type>::param_type second_param_type;
typedef typename call_traits<first_type>::reference first_reference;
typedef typename call_traits<second_type>::reference second_reference;
typedef typename call_traits<first_type>::const_reference first_const_reference;
typedef typename call_traits<second_type>::const_reference second_const_reference;
compressed_pair_1() : T2(), _first() {}
compressed_pair_1(first_param_type x, second_param_type y) : T2(y), _first(x) {}
template <class A>
explicit compressed_pair_1(const A& val)
{
init_one<best_conversion_traits<A, T1, T2>::value>::init(val, &_first, static_cast<T2*>(this));
}
compressed_pair_1(const ::boost::compressed_pair<T1,T2>& x)
: T2(x.second()), _first(x.first()) {}
#if defined(BOOST_MSVC) && BOOST_MSVC <= 1300
// Total weirdness. If the assignment to _first is moved after
// the call to the inherited operator=, then this breaks graph/test/graph.cpp
// by way of iterator_adaptor.
compressed_pair_1& operator=(const compressed_pair_1& x) {
_first = x._first;
T2::operator=(x);
return *this;
}
#endif
first_reference first() { return _first; }
first_const_reference first() const { return _first; }
second_reference second() { return *this; }
second_const_reference second() const { return *this; }
void swap(compressed_pair_1& y)
{
// no need to swap empty base class:
using std::swap;
swap(_first, y._first);
}
};
// T1 != T2, T1 empty
template <class T1, class T2>
class compressed_pair_2 : T1
{
private:
T2 _second;
public:
typedef T1 first_type;
typedef T2 second_type;
typedef typename call_traits<first_type>::param_type first_param_type;
typedef typename call_traits<second_type>::param_type second_param_type;
typedef typename call_traits<first_type>::reference first_reference;
typedef typename call_traits<second_type>::reference second_reference;
typedef typename call_traits<first_type>::const_reference first_const_reference;
typedef typename call_traits<second_type>::const_reference second_const_reference;
compressed_pair_2() : T1(), _second() {}
compressed_pair_2(first_param_type x, second_param_type y) : T1(x), _second(y) {}
template <class A>
explicit compressed_pair_2(const A& val)
{
init_one<best_conversion_traits<A, T1, T2>::value>::init(val, static_cast<T1*>(this), &_second);
}
compressed_pair_2(const ::boost::compressed_pair<T1,T2>& x)
: T1(x.first()), _second(x.second()) {}
#if 0
compressed_pair_2& operator=(const compressed_pair_2& x) {
cout << "assigning compressed pair 2" << endl;
T1::operator=(x);
_second = x._second;
cout << "finished assigning compressed pair 2" << endl;
return *this;
}
#endif
first_reference first() { return *this; }
first_const_reference first() const { return *this; }
second_reference second() { return _second; }
second_const_reference second() const { return _second; }
void swap(compressed_pair_2& y)
{
// no need to swap empty base class:
using std::swap;
swap(_second, y._second);
}
};
// T1 != T2, both empty
template <class T1, class T2>
class compressed_pair_3 : T1, T2
{
public:
typedef T1 first_type;
typedef T2 second_type;
typedef typename call_traits<first_type>::param_type first_param_type;
typedef typename call_traits<second_type>::param_type second_param_type;
typedef typename call_traits<first_type>::reference first_reference;
typedef typename call_traits<second_type>::reference second_reference;
typedef typename call_traits<first_type>::const_reference first_const_reference;
typedef typename call_traits<second_type>::const_reference second_const_reference;
compressed_pair_3() : T1(), T2() {}
compressed_pair_3(first_param_type x, second_param_type y) : T1(x), T2(y) {}
template <class A>
explicit compressed_pair_3(const A& val)
{
init_one<best_conversion_traits<A, T1, T2>::value>::init(val, static_cast<T1*>(this), static_cast<T2*>(this));
}
compressed_pair_3(const ::boost::compressed_pair<T1,T2>& x)
: T1(x.first()), T2(x.second()) {}
first_reference first() { return *this; }
first_const_reference first() const { return *this; }
second_reference second() { return *this; }
second_const_reference second() const { return *this; }
void swap(compressed_pair_3& y)
{
// no need to swap empty base classes:
}
};
// T1 == T2, and empty
template <class T1, class T2>
class compressed_pair_4 : T1
{
public:
typedef T1 first_type;
typedef T2 second_type;
typedef typename call_traits<first_type>::param_type first_param_type;
typedef typename call_traits<second_type>::param_type second_param_type;
typedef typename call_traits<first_type>::reference first_reference;
typedef typename call_traits<second_type>::reference second_reference;
typedef typename call_traits<first_type>::const_reference first_const_reference;
typedef typename call_traits<second_type>::const_reference second_const_reference;
compressed_pair_4() : T1() {}
compressed_pair_4(first_param_type x, second_param_type y) : T1(x), m_second(y) {}
// only one single argument constructor since T1 == T2
explicit compressed_pair_4(first_param_type x) : T1(x), m_second(x) {}
compressed_pair_4(const ::boost::compressed_pair<T1,T2>& x)
: T1(x.first()), m_second(x.second()) {}
first_reference first() { return *this; }
first_const_reference first() const { return *this; }
second_reference second() { return m_second; }
second_const_reference second() const { return m_second; }
void swap(compressed_pair_4& y)
{
// no need to swap empty base classes:
}
private:
T2 m_second;
};
// T1 == T2, not empty
template <class T1, class T2>
class compressed_pair_5
{
private:
T1 _first;
T2 _second;
public:
typedef T1 first_type;
typedef T2 second_type;
typedef typename call_traits<first_type>::param_type first_param_type;
typedef typename call_traits<second_type>::param_type second_param_type;
typedef typename call_traits<first_type>::reference first_reference;
typedef typename call_traits<second_type>::reference second_reference;
typedef typename call_traits<first_type>::const_reference first_const_reference;
typedef typename call_traits<second_type>::const_reference second_const_reference;
compressed_pair_5() : _first(), _second() {}
compressed_pair_5(first_param_type x, second_param_type y) : _first(x), _second(y) {}
// only one single argument constructor since T1 == T2
explicit compressed_pair_5(first_param_type x) : _first(x), _second(x) {}
compressed_pair_5(const ::boost::compressed_pair<T1,T2>& c)
: _first(c.first()), _second(c.second()) {}
first_reference first() { return _first; }
first_const_reference first() const { return _first; }
second_reference second() { return _second; }
second_const_reference second() const { return _second; }
void swap(compressed_pair_5& y)
{
using std::swap;
swap(_first, y._first);
swap(_second, y._second);
}
};
template <bool e1, bool e2, bool same>
struct compressed_pair_chooser
{
template <class T1, class T2>
struct rebind
{
typedef compressed_pair_0<T1, T2> type;
};
};
template <>
struct compressed_pair_chooser<false, true, false>
{
template <class T1, class T2>
struct rebind
{
typedef compressed_pair_1<T1, T2> type;
};
};
template <>
struct compressed_pair_chooser<true, false, false>
{
template <class T1, class T2>
struct rebind
{
typedef compressed_pair_2<T1, T2> type;
};
};
template <>
struct compressed_pair_chooser<true, true, false>
{
template <class T1, class T2>
struct rebind
{
typedef compressed_pair_3<T1, T2> type;
};
};
template <>
struct compressed_pair_chooser<true, true, true>
{
template <class T1, class T2>
struct rebind
{
typedef compressed_pair_4<T1, T2> type;
};
};
template <>
struct compressed_pair_chooser<false, false, true>
{
template <class T1, class T2>
struct rebind
{
typedef compressed_pair_5<T1, T2> type;
};
};
template <class T1, class T2>
struct compressed_pair_traits
{
private:
typedef compressed_pair_chooser<is_empty<T1>::value, is_empty<T2>::value, is_same<T1,T2>::value> chooser;
typedef typename chooser::template rebind<T1, T2> bound_type;
public:
typedef typename bound_type::type type;
};
} // namespace detail
template <class T1, class T2>
class compressed_pair : public detail::compressed_pair_traits<T1, T2>::type
{
private:
typedef typename detail::compressed_pair_traits<T1, T2>::type base_type;
public:
typedef T1 first_type;
typedef T2 second_type;
typedef typename call_traits<first_type>::param_type first_param_type;
typedef typename call_traits<second_type>::param_type second_param_type;
typedef typename call_traits<first_type>::reference first_reference;
typedef typename call_traits<second_type>::reference second_reference;
typedef typename call_traits<first_type>::const_reference first_const_reference;
typedef typename call_traits<second_type>::const_reference second_const_reference;
compressed_pair() : base_type() {}
compressed_pair(first_param_type x, second_param_type y) : base_type(x, y) {}
template <class A>
explicit compressed_pair(const A& x) : base_type(x){}
first_reference first() { return base_type::first(); }
first_const_reference first() const { return base_type::first(); }
second_reference second() { return base_type::second(); }
second_const_reference second() const { return base_type::second(); }
};
template <class T1, class T2>
inline void swap(compressed_pair<T1, T2>& x, compressed_pair<T1, T2>& y)
{
x.swap(y);
}
#else
// no partial specialisation, no member templates:
template <class T1, class T2>
class compressed_pair
@ -72,7 +500,11 @@ inline void swap(compressed_pair<T1, T2>& x, compressed_pair<T1, T2>& y)
x.swap(y);
}
#endif
} // boost
#endif // BOOST_OB_COMPRESSED_PAIR_HPP

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//Copyright (c) 2006-2008 Emil Dotchevski and Reverge Studios, Inc.
//Distributed under the Boost Software License, Version 1.0. (See accompanying
//file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#ifndef UUID_1D94A7C6054E11DB9804B622A1EF5492
#define UUID_1D94A7C6054E11DB9804B622A1EF5492
#include <boost/exception/info_tuple.hpp>
#include <boost/exception_ptr.hpp>
#include <boost/throw_exception.hpp>
#endif

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@ -0,0 +1,80 @@
// (C) Copyright Jens Maurer 2001.
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// Revision History:
// 15 Nov 2001 Jens Maurer
// created.
// See http://www.boost.org/libs/utility/iterator_adaptors.htm for documentation.
#ifndef BOOST_ITERATOR_ADAPTOR_GENERATOR_ITERATOR_HPP
#define BOOST_ITERATOR_ADAPTOR_GENERATOR_ITERATOR_HPP
#include <boost/iterator/iterator_facade.hpp>
#include <boost/ref.hpp>
namespace boost {
template<class Generator>
class generator_iterator
: public iterator_facade<
generator_iterator<Generator>
, typename Generator::result_type
, single_pass_traversal_tag
, typename Generator::result_type const&
>
{
typedef iterator_facade<
generator_iterator<Generator>
, typename Generator::result_type
, single_pass_traversal_tag
, typename Generator::result_type const&
> super_t;
public:
generator_iterator() {}
generator_iterator(Generator* g) : m_g(g), m_value((*m_g)()) {}
void increment()
{
m_value = (*m_g)();
}
const typename Generator::result_type&
dereference() const
{
return m_value;
}
bool equal(generator_iterator const& y) const
{
return this->m_g == y.m_g && this->m_value == y.m_value;
}
private:
Generator* m_g;
typename Generator::result_type m_value;
};
template<class Generator>
struct generator_iterator_generator
{
typedef generator_iterator<Generator> type;
};
template <class Generator>
inline generator_iterator<Generator>
make_generator_iterator(Generator & gen)
{
typedef generator_iterator<Generator> result_t;
return result_t(&gen);
}
} // namespace boost
#endif // BOOST_ITERATOR_ADAPTOR_GENERATOR_ITERATOR_HPP

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@ -0,0 +1,51 @@
// Boost next_prior.hpp header file ---------------------------------------//
// (C) Copyright Dave Abrahams and Daniel Walker 1999-2003. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
// See http://www.boost.org/libs/utility for documentation.
// Revision History
// 13 Dec 2003 Added next(x, n) and prior(x, n) (Daniel Walker)
#ifndef BOOST_NEXT_PRIOR_HPP_INCLUDED
#define BOOST_NEXT_PRIOR_HPP_INCLUDED
#include <iterator>
namespace boost {
// Helper functions for classes like bidirectional iterators not supporting
// operator+ and operator-
//
// Usage:
// const std::list<T>::iterator p = get_some_iterator();
// const std::list<T>::iterator prev = boost::prior(p);
// const std::list<T>::iterator next = boost::next(prev, 2);
// Contributed by Dave Abrahams
template <class T>
inline T next(T x) { return ++x; }
template <class T, class Distance>
inline T next(T x, Distance n)
{
std::advance(x, n);
return x;
}
template <class T>
inline T prior(T x) { return --x; }
template <class T, class Distance>
inline T prior(T x, Distance n)
{
std::advance(x, -n);
return x;
}
} // namespace boost
#endif // BOOST_NEXT_PRIOR_HPP_INCLUDED

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// Boost noncopyable.hpp header file --------------------------------------//
// (C) Copyright Beman Dawes 1999-2003. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
// See http://www.boost.org/libs/utility for documentation.
#ifndef BOOST_NONCOPYABLE_HPP_INCLUDED
#define BOOST_NONCOPYABLE_HPP_INCLUDED
namespace boost {
// Private copy constructor and copy assignment ensure classes derived from
// class noncopyable cannot be copied.
// Contributed by Dave Abrahams
namespace noncopyable_ // protection from unintended ADL
{
class noncopyable
{
protected:
noncopyable() {}
~noncopyable() {}
private: // emphasize the following members are private
noncopyable( const noncopyable& );
const noncopyable& operator=( const noncopyable& );
};
}
typedef noncopyable_::noncopyable noncopyable;
} // namespace boost
#endif // BOOST_NONCOPYABLE_HPP_INCLUDED

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178
include/boost/ref.hpp Normal file
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@ -0,0 +1,178 @@
#ifndef BOOST_REF_HPP_INCLUDED
#define BOOST_REF_HPP_INCLUDED
// MS compatible compilers support #pragma once
#if defined(_MSC_VER) && (_MSC_VER >= 1020)
# pragma once
#endif
#include <boost/config.hpp>
#include <boost/utility/addressof.hpp>
#include <boost/mpl/bool.hpp>
#include <boost/detail/workaround.hpp>
//
// ref.hpp - ref/cref, useful helper functions
//
// Copyright (C) 1999, 2000 Jaakko J<>rvi (jaakko.jarvi@cs.utu.fi)
// Copyright (C) 2001, 2002 Peter Dimov
// Copyright (C) 2002 David Abrahams
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// See http://www.boost.org/libs/bind/ref.html for documentation.
//
namespace boost
{
template<class T> class reference_wrapper
{
public:
typedef T type;
#if defined( BOOST_MSVC ) && BOOST_WORKAROUND( BOOST_MSVC, < 1300 )
explicit reference_wrapper(T& t): t_(&t) {}
#else
explicit reference_wrapper(T& t): t_(boost::addressof(t)) {}
#endif
operator T& () const { return *t_; }
T& get() const { return *t_; }
T* get_pointer() const { return t_; }
private:
T* t_;
};
# if defined( __BORLANDC__ ) && BOOST_WORKAROUND( __BORLANDC__, BOOST_TESTED_AT(0x581) )
# define BOOST_REF_CONST
# else
# define BOOST_REF_CONST const
# endif
template<class T> inline reference_wrapper<T> BOOST_REF_CONST ref(T & t)
{
return reference_wrapper<T>(t);
}
template<class T> inline reference_wrapper<T const> BOOST_REF_CONST cref(T const & t)
{
return reference_wrapper<T const>(t);
}
# undef BOOST_REF_CONST
# ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
template<typename T>
class is_reference_wrapper
: public mpl::false_
{
};
template<typename T>
class unwrap_reference
{
public:
typedef T type;
};
# define AUX_REFERENCE_WRAPPER_METAFUNCTIONS_DEF(X) \
template<typename T> \
class is_reference_wrapper< X > \
: public mpl::true_ \
{ \
}; \
\
template<typename T> \
class unwrap_reference< X > \
{ \
public: \
typedef T type; \
}; \
/**/
AUX_REFERENCE_WRAPPER_METAFUNCTIONS_DEF(reference_wrapper<T>)
#if !defined(BOOST_NO_CV_SPECIALIZATIONS)
AUX_REFERENCE_WRAPPER_METAFUNCTIONS_DEF(reference_wrapper<T> const)
AUX_REFERENCE_WRAPPER_METAFUNCTIONS_DEF(reference_wrapper<T> volatile)
AUX_REFERENCE_WRAPPER_METAFUNCTIONS_DEF(reference_wrapper<T> const volatile)
#endif
# undef AUX_REFERENCE_WRAPPER_METAFUNCTIONS_DEF
# else // no partial specialization
} // namespace boost
#include <boost/type.hpp>
namespace boost
{
namespace detail
{
typedef char (&yes_reference_wrapper_t)[1];
typedef char (&no_reference_wrapper_t)[2];
no_reference_wrapper_t is_reference_wrapper_test(...);
template<typename T>
yes_reference_wrapper_t is_reference_wrapper_test(type< reference_wrapper<T> >);
template<bool wrapped>
struct reference_unwrapper
{
template <class T>
struct apply
{
typedef T type;
};
};
template<>
struct reference_unwrapper<true>
{
template <class T>
struct apply
{
typedef typename T::type type;
};
};
}
template<typename T>
class is_reference_wrapper
{
public:
BOOST_STATIC_CONSTANT(
bool, value = (
sizeof(detail::is_reference_wrapper_test(type<T>()))
== sizeof(detail::yes_reference_wrapper_t)));
typedef ::boost::mpl::bool_<value> type;
};
template <typename T>
class unwrap_reference
: public detail::reference_unwrapper<
is_reference_wrapper<T>::value
>::template apply<T>
{};
# endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
} // namespace boost
#endif // #ifndef BOOST_REF_HPP_INCLUDED

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@ -1,96 +1,19 @@
// boost utility.hpp header file -------------------------------------------//
// Boost utility.hpp header file -------------------------------------------//
// (C) Copyright boost.org 1999. Permission to copy, use, modify, sell
// and distribute this software is granted provided this copyright
// notice appears in all copies. This software is provided "as is" without
// express or implied warranty, and with no claim as to its suitability for
// any purpose.
// Copyright 1999-2003 Aleksey Gurtovoy. Use, modification, and distribution are
// subject to the Boost Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or a copy at <http://www.boost.org/LICENSE_1_0.txt>.)
// See http://www.boost.org for most recent version including documentation.
// Classes appear in alphabetical order
// Revision History
// 26 Jan 00 protected noncopyable destructor added (Miki Jovanovic)
// 10 Dec 99 next() and prior() templates added (Dave Abrahams)
// 30 Aug 99 moved cast templates to cast.hpp (Beman Dawes)
// 3 Aug 99 cast templates added
// 20 Jul 99 name changed to utility.hpp
// 9 Jun 99 protected noncopyable default ctor
// 2 Jun 99 Initial Version. Class noncopyable only contents (Dave Abrahams)
// See <http://www.boost.org/libs/utility/> for the library's home page.
#ifndef BOOST_UTILITY_HPP
#define BOOST_UTILITY_HPP
#include <boost/config.hpp>
#include <cstddef> // for size_t
#include <utility> // for std::pair
namespace boost
{
// next() and prior() template functions -----------------------------------//
// Helper functions for classes like bidirectional iterators not supporting
// operator+ and operator-.
//
// Usage:
// const std::list<T>::iterator p = get_some_iterator();
// const std::list<T>::iterator prev = boost::prior(p);
// Contributed by Dave Abrahams
template <class T>
T next(T x) { return ++x; }
template <class T>
T prior(T x) { return --x; }
// class noncopyable -------------------------------------------------------//
// Private copy constructor and copy assignment ensure classes derived from
// class noncopyable cannot be copied.
// Contributed by Dave Abrahams
class noncopyable
{
protected:
noncopyable(){}
~noncopyable(){}
private: // emphasize the following members are private
noncopyable( const noncopyable& );
const noncopyable& operator=( const noncopyable& );
}; // noncopyable
// class tied -------------------------------------------------------//
// A helper for conveniently assigning the two values from a pair
// into separate variables. The idea for this comes from Jaakko J<>rvi's
// Binder/Lambda Library.
// Constributed by Jeremy Siek
template <class A, class B>
class tied {
public:
inline tied(A& a, B& b) : _a(a), _b(b) { }
template <class U, class V>
inline tied& operator=(const std::pair<U,V>& p) {
_a = p.first;
_b = p.second;
return *this;
}
protected:
A& _a;
B& _b;
};
template <class A, class B>
inline tied<A,B> tie(A& a, B& b) { return tied<A,B>(a, b); }
} // namespace boost
#include <boost/utility/addressof.hpp>
#include <boost/utility/base_from_member.hpp>
#include <boost/utility/enable_if.hpp>
#include <boost/checked_delete.hpp>
#include <boost/next_prior.hpp>
#include <boost/noncopyable.hpp>
#endif // BOOST_UTILITY_HPP

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@ -0,0 +1,63 @@
// Copyright (C) 2002 Brad King (brad.king@kitware.com)
// Douglas Gregor (gregod@cs.rpi.edu)
//
// Copyright (C) 2002, 2008 Peter Dimov
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
// For more information, see http://www.boost.org
#ifndef BOOST_UTILITY_ADDRESSOF_HPP
# define BOOST_UTILITY_ADDRESSOF_HPP
# include <boost/config.hpp>
# include <boost/detail/workaround.hpp>
namespace boost
{
namespace detail
{
template<class T> struct addressof_impl
{
static inline T * f( T & v, long )
{
return reinterpret_cast<T*>(
&const_cast<char&>(reinterpret_cast<const volatile char &>(v)));
}
static inline T * f( T * v, int )
{
return v;
}
};
} // namespace detail
template<class T> T * addressof( T & v )
{
return boost::detail::addressof_impl<T>::f( v, 0 );
}
// Borland doesn't like casting an array reference to a char reference
// but these overloads work around the problem.
# if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))
template<typename T,std::size_t N>
T (*addressof(T (&t)[N]))[N]
{
return reinterpret_cast<T(*)[N]>(&t);
}
template<typename T,std::size_t N>
const T (*addressof(const T (&t)[N]))[N]
{
return reinterpret_cast<const T(*)[N]>(&t);
}
# endif
} // namespace boost
#endif // BOOST_UTILITY_ADDRESSOF_HPP

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// boost utility/base_from_member.hpp header file --------------------------//
// Copyright 2001, 2003, 2004 Daryle Walker. Use, modification, and
// distribution are subject to the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or a copy at
// <http://www.boost.org/LICENSE_1_0.txt>.)
// See <http://www.boost.org/libs/utility/> for the library's home page.
#ifndef BOOST_UTILITY_BASE_FROM_MEMBER_HPP
#define BOOST_UTILITY_BASE_FROM_MEMBER_HPP
#include <boost/preprocessor/arithmetic/inc.hpp>
#include <boost/preprocessor/repetition/enum_binary_params.hpp>
#include <boost/preprocessor/repetition/enum_params.hpp>
#include <boost/preprocessor/repetition/repeat_from_to.hpp>
// Base-from-member arity configuration macro ------------------------------//
// The following macro determines how many arguments will be in the largest
// constructor template of base_from_member. Constructor templates will be
// generated from one argument to this maximum. Code from other files can read
// this number if they need to always match the exact maximum base_from_member
// uses. The maximum constructor length can be changed by overriding the
// #defined constant. Make sure to apply the override, if any, for all source
// files during project compiling for consistency.
// Contributed by Jonathan Turkanis
#ifndef BOOST_BASE_FROM_MEMBER_MAX_ARITY
#define BOOST_BASE_FROM_MEMBER_MAX_ARITY 10
#endif
// An iteration of a constructor template for base_from_member -------------//
// A macro that should expand to:
// template < typename T1, ..., typename Tn >
// base_from_member( T1 x1, ..., Tn xn )
// : member( x1, ..., xn )
// {}
// This macro should only persist within this file.
#define BOOST_PRIVATE_CTR_DEF( z, n, data ) \
template < BOOST_PP_ENUM_PARAMS(n, typename T) > \
explicit base_from_member( BOOST_PP_ENUM_BINARY_PARAMS(n, T, x) ) \
: member( BOOST_PP_ENUM_PARAMS(n, x) ) \
{} \
/**/
namespace boost
{
// Base-from-member class template -----------------------------------------//
// Helper to initialize a base object so a derived class can use this
// object in the initialization of another base class. Used by
// Dietmar Kuehl from ideas by Ron Klatcho to solve the problem of a
// base class needing to be initialized by a member.
// Contributed by Daryle Walker
template < typename MemberType, int UniqueID = 0 >
class base_from_member
{
protected:
MemberType member;
base_from_member()
: member()
{}
BOOST_PP_REPEAT_FROM_TO( 1, BOOST_PP_INC(BOOST_BASE_FROM_MEMBER_MAX_ARITY),
BOOST_PRIVATE_CTR_DEF, _ )
}; // boost::base_from_member
} // namespace boost
// Undo any private macros
#undef BOOST_PRIVATE_CTR_DEF
#endif // BOOST_UTILITY_BASE_FROM_MEMBER_HPP

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// Copyright (C) 2003, Fernando Luis Cacciola Carballal.
//
// Use, modification, and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// See http://www.boost.org/lib/optional for documentation.
//
// You are welcome to contact the author at:
// fernando_cacciola@hotmail.com
//
#ifndef BOOST_UTILITY_COMPARE_POINTEES_25AGO2003_HPP
#define BOOST_UTILITY_COMPARE_POINTEES_25AGO2003_HPP
#include<functional>
namespace boost {
// template<class OP> bool equal_pointees(OP const& x, OP const& y);
// template<class OP> struct equal_pointees_t;
//
// Being OP a model of OptionalPointee (either a pointer or an optional):
//
// If both x and y have valid pointees, returns the result of (*x == *y)
// If only one has a valid pointee, returns false.
// If none have valid pointees, returns true.
// No-throw
template<class OptionalPointee>
inline
bool equal_pointees ( OptionalPointee const& x, OptionalPointee const& y )
{
return (!x) != (!y) ? false : ( !x ? true : (*x) == (*y) ) ;
}
template<class OptionalPointee>
struct equal_pointees_t : std::binary_function<OptionalPointee,OptionalPointee,bool>
{
bool operator() ( OptionalPointee const& x, OptionalPointee const& y ) const
{ return equal_pointees(x,y) ; }
} ;
// template<class OP> bool less_pointees(OP const& x, OP const& y);
// template<class OP> struct less_pointees_t;
//
// Being OP a model of OptionalPointee (either a pointer or an optional):
//
// If y has not a valid pointee, returns false.
// ElseIf x has not a valid pointee, returns true.
// ElseIf both x and y have valid pointees, returns the result of (*x < *y)
// No-throw
template<class OptionalPointee>
inline
bool less_pointees ( OptionalPointee const& x, OptionalPointee const& y )
{
return !y ? false : ( !x ? true : (*x) < (*y) ) ;
}
template<class OptionalPointee>
struct less_pointees_t : std::binary_function<OptionalPointee,OptionalPointee,bool>
{
bool operator() ( OptionalPointee const& x, OptionalPointee const& y ) const
{ return less_pointees(x,y) ; }
} ;
} // namespace boost
#endif

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// Copyright (C) 2003, Fernando Luis Cacciola Carballal.
// Copyright (C) 2007, Tobias Schwinger.
//
// Use, modification, and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// See http://www.boost.org/lib/optional for documentation.
//
// You are welcome to contact the author at:
// fernando_cacciola@hotmail.com
//
#ifndef BOOST_UTILITY_DETAIL_INPLACE_FACTORY_PREFIX_04APR2007_HPP
#define BOOST_UTILITY_DETAIL_INPLACE_FACTORY_PREFIX_04APR2007_HPP
#include <new>
#include <cstddef>
#include <boost/config.hpp>
#include <boost/preprocessor/cat.hpp>
#include <boost/preprocessor/punctuation/paren.hpp>
#include <boost/preprocessor/iteration/iterate.hpp>
#include <boost/preprocessor/repetition/repeat.hpp>
#include <boost/preprocessor/repetition/enum.hpp>
#include <boost/preprocessor/repetition/enum_params.hpp>
#include <boost/preprocessor/repetition/enum_binary_params.hpp>
#include <boost/preprocessor/repetition/enum_trailing_params.hpp>
#define BOOST_DEFINE_INPLACE_FACTORY_CLASS_MEMBER_INIT(z,n,_) BOOST_PP_CAT(m_a,n) BOOST_PP_LPAREN() BOOST_PP_CAT(a,n) BOOST_PP_RPAREN()
#define BOOST_DEFINE_INPLACE_FACTORY_CLASS_MEMBER_DECL(z,n,_) BOOST_PP_CAT(A,n) const& BOOST_PP_CAT(m_a,n);
#define BOOST_MAX_INPLACE_FACTORY_ARITY 10
#undef BOOST_UTILITY_DETAIL_INPLACE_FACTORY_SUFFIX_04APR2007_HPP
#endif

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@ -0,0 +1,23 @@
// Copyright (C) 2003, Fernando Luis Cacciola Carballal.
// Copyright (C) 2007, Tobias Schwinger.
//
// Use, modification, and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// See http://www.boost.org/lib/optional for documentation.
//
// You are welcome to contact the author at:
// fernando_cacciola@hotmail.com
//
#ifndef BOOST_UTILITY_DETAIL_INPLACE_FACTORY_SUFFIX_04APR2007_HPP
#define BOOST_UTILITY_DETAIL_INPLACE_FACTORY_SUFFIX_04APR2007_HPP
#undef BOOST_DEFINE_INPLACE_FACTORY_CLASS_MEMBER_INIT
#undef BOOST_DEFINE_INPLACE_FACTORY_CLASS_MEMBER_DECL
#undef BOOST_MAX_INPLACE_FACTORY_ARITY
#undef BOOST_UTILITY_DETAIL_INPLACE_FACTORY_PREFIX_04APR2007_HPP
#endif

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// Boost result_of library
// Copyright Douglas Gregor 2004. Use, modification and
// distribution is subject to the Boost Software License, Version
// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
// For more information, see http://www.boost.org/libs/utility
#if !defined(BOOST_PP_IS_ITERATING)
# error Boost result_of - do not include this file!
#endif
#if defined(BOOST_HAS_DECLTYPE)
// As of N2588, C++0x result_of only supports function call
// expressions of the form f(x). This precludes support for member
// function pointers, which are invoked with expressions of the form
// o->*f(x). This implementation supports both.
template<typename F BOOST_PP_COMMA_IF(BOOST_PP_ITERATION())
BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),typename T)>
struct result_of<F(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),T))>
: mpl::if_<
mpl::or_< is_pointer<F>, is_member_function_pointer<F> >
, detail::result_of_impl<
F, F(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),T)), false
>
, detail::result_of_decltype_impl<
F(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),T))
>
>::type
{};
namespace detail {
# define BOOST_RESULT_OF_STATIC_MEMBERS(z, n, _) \
static T ## n t ## n; \
/**/
template<typename F BOOST_PP_COMMA_IF(BOOST_PP_ITERATION())
BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),typename T)>
class result_of_decltype_impl<F(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),T))>
{
static F f;
BOOST_PP_REPEAT(BOOST_PP_ITERATION(), BOOST_RESULT_OF_STATIC_MEMBERS, _)
public:
typedef decltype(f(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),t))) type;
};
} // namespace detail
#else // defined(BOOST_HAS_DECLTYPE)
// CWPro8 requires an argument in a function type specialization
#if BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3002)) && BOOST_PP_ITERATION() == 0
# define BOOST_RESULT_OF_ARGS void
#else
# define BOOST_RESULT_OF_ARGS BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),T)
#endif
#if !BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551))
template<typename F BOOST_PP_COMMA_IF(BOOST_PP_ITERATION())
BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),typename T)>
struct result_of<F(BOOST_RESULT_OF_ARGS)>
: boost::detail::result_of_impl<F, F(BOOST_RESULT_OF_ARGS), (boost::detail::has_result_type<F>::value)> {};
#endif
#undef BOOST_RESULT_OF_ARGS
#endif // defined(BOOST_HAS_DECLTYPE)
#if BOOST_PP_ITERATION() >= 1
namespace detail {
template<typename R, typename FArgs BOOST_PP_COMMA_IF(BOOST_PP_ITERATION())
BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),typename T)>
struct result_of_impl<R (*)(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),T)), FArgs, false>
{
typedef R type;
};
template<typename R, typename FArgs BOOST_PP_COMMA_IF(BOOST_PP_ITERATION())
BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),typename T)>
struct result_of_impl<R (&)(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),T)), FArgs, false>
{
typedef R type;
};
#if !BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551))
template<typename R, typename FArgs BOOST_PP_COMMA_IF(BOOST_PP_ITERATION())
BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),typename T)>
struct result_of_impl<R (T0::*)
(BOOST_PP_ENUM_SHIFTED_PARAMS(BOOST_PP_ITERATION(),T)),
FArgs, false>
{
typedef R type;
};
template<typename R, typename FArgs BOOST_PP_COMMA_IF(BOOST_PP_ITERATION())
BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),typename T)>
struct result_of_impl<R (T0::*)
(BOOST_PP_ENUM_SHIFTED_PARAMS(BOOST_PP_ITERATION(),T))
const,
FArgs, false>
{
typedef R type;
};
template<typename R, typename FArgs BOOST_PP_COMMA_IF(BOOST_PP_ITERATION())
BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),typename T)>
struct result_of_impl<R (T0::*)
(BOOST_PP_ENUM_SHIFTED_PARAMS(BOOST_PP_ITERATION(),T))
volatile,
FArgs, false>
{
typedef R type;
};
template<typename R, typename FArgs BOOST_PP_COMMA_IF(BOOST_PP_ITERATION())
BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),typename T)>
struct result_of_impl<R (T0::*)
(BOOST_PP_ENUM_SHIFTED_PARAMS(BOOST_PP_ITERATION(),T))
const volatile,
FArgs, false>
{
typedef R type;
};
#endif
}
#endif

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// Boost enable_if library
// Copyright 2003 (c) The Trustees of Indiana University.
// Use, modification, and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
// Authors: Jaakko J<>rvi (jajarvi at osl.iu.edu)
// Jeremiah Willcock (jewillco at osl.iu.edu)
// Andrew Lumsdaine (lums at osl.iu.edu)
#ifndef BOOST_UTILITY_ENABLE_IF_HPP
#define BOOST_UTILITY_ENABLE_IF_HPP
#include "boost/config.hpp"
// Even the definition of enable_if causes problems on some compilers,
// so it's macroed out for all compilers that do not support SFINAE
#ifndef BOOST_NO_SFINAE
namespace boost
{
template <bool B, class T = void>
struct enable_if_c {
typedef T type;
};
template <class T>
struct enable_if_c<false, T> {};
template <class Cond, class T = void>
struct enable_if : public enable_if_c<Cond::value, T> {};
template <bool B, class T>
struct lazy_enable_if_c {
typedef typename T::type type;
};
template <class T>
struct lazy_enable_if_c<false, T> {};
template <class Cond, class T>
struct lazy_enable_if : public lazy_enable_if_c<Cond::value, T> {};
template <bool B, class T = void>
struct disable_if_c {
typedef T type;
};
template <class T>
struct disable_if_c<true, T> {};
template <class Cond, class T = void>
struct disable_if : public disable_if_c<Cond::value, T> {};
template <bool B, class T>
struct lazy_disable_if_c {
typedef typename T::type type;
};
template <class T>
struct lazy_disable_if_c<true, T> {};
template <class Cond, class T>
struct lazy_disable_if : public lazy_disable_if_c<Cond::value, T> {};
} // namespace boost
#else
namespace boost {
namespace detail { typedef void enable_if_default_T; }
template <typename T>
struct enable_if_does_not_work_on_this_compiler;
template <bool B, class T = detail::enable_if_default_T>
struct enable_if_c : enable_if_does_not_work_on_this_compiler<T>
{ };
template <bool B, class T = detail::enable_if_default_T>
struct disable_if_c : enable_if_does_not_work_on_this_compiler<T>
{ };
template <bool B, class T = detail::enable_if_default_T>
struct lazy_enable_if_c : enable_if_does_not_work_on_this_compiler<T>
{ };
template <bool B, class T = detail::enable_if_default_T>
struct lazy_disable_if_c : enable_if_does_not_work_on_this_compiler<T>
{ };
template <class Cond, class T = detail::enable_if_default_T>
struct enable_if : enable_if_does_not_work_on_this_compiler<T>
{ };
template <class Cond, class T = detail::enable_if_default_T>
struct disable_if : enable_if_does_not_work_on_this_compiler<T>
{ };
template <class Cond, class T = detail::enable_if_default_T>
struct lazy_enable_if : enable_if_does_not_work_on_this_compiler<T>
{ };
template <class Cond, class T = detail::enable_if_default_T>
struct lazy_disable_if : enable_if_does_not_work_on_this_compiler<T>
{ };
} // namespace boost
#endif // BOOST_NO_SFINAE
#endif

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// Copyright (C) 2003, Fernando Luis Cacciola Carballal.
// Copyright (C) 2007, Tobias Schwinger.
//
// Use, modification, and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// See http://www.boost.org/lib/optional for documentation.
//
// You are welcome to contact the author at:
// fernando_cacciola@hotmail.com
//
#ifndef BOOST_UTILITY_INPLACE_FACTORY_04APR2007_HPP
#ifndef BOOST_PP_IS_ITERATING
#include <boost/utility/detail/in_place_factory_prefix.hpp>
namespace boost {
class in_place_factory_base {} ;
#define BOOST_PP_ITERATION_LIMITS (0, BOOST_MAX_INPLACE_FACTORY_ARITY)
#define BOOST_PP_FILENAME_1 <boost/utility/in_place_factory.hpp>
#include BOOST_PP_ITERATE()
} // namespace boost
#include <boost/utility/detail/in_place_factory_suffix.hpp>
#define BOOST_UTILITY_INPLACE_FACTORY_04APR2007_HPP
#else
#define N BOOST_PP_ITERATION()
#if N
template< BOOST_PP_ENUM_PARAMS(N, class A) >
#endif
class BOOST_PP_CAT(in_place_factory,N)
:
public in_place_factory_base
{
public:
explicit BOOST_PP_CAT(in_place_factory,N)
( BOOST_PP_ENUM_BINARY_PARAMS(N,A,const& a) )
#if N > 0
: BOOST_PP_ENUM(N, BOOST_DEFINE_INPLACE_FACTORY_CLASS_MEMBER_INIT, _)
#endif
{}
template<class T>
void* apply(void* address
BOOST_APPEND_EXPLICIT_TEMPLATE_TYPE(T)) const
{
return new(address) T( BOOST_PP_ENUM_PARAMS(N, m_a) );
}
template<class T>
void* apply(void* address, std::size_t n
BOOST_APPEND_EXPLICIT_TEMPLATE_TYPE(T)) const
{
for(char* next = address = this->BOOST_NESTED_TEMPLATE apply<T>(address);
!! --n;)
this->BOOST_NESTED_TEMPLATE apply<T>(next = next+sizeof(T));
return address;
}
BOOST_PP_REPEAT(N, BOOST_DEFINE_INPLACE_FACTORY_CLASS_MEMBER_DECL, _)
};
#if N > 0
template< BOOST_PP_ENUM_PARAMS(N, class A) >
inline BOOST_PP_CAT(in_place_factory,N)< BOOST_PP_ENUM_PARAMS(N, A) >
in_place( BOOST_PP_ENUM_BINARY_PARAMS(N, A, const& a) )
{
return BOOST_PP_CAT(in_place_factory,N)< BOOST_PP_ENUM_PARAMS(N, A) >
( BOOST_PP_ENUM_PARAMS(N, a) );
}
#else
inline in_place_factory0 in_place()
{
return in_place_factory0();
}
#endif
#undef N
#endif
#endif

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// Boost result_of library
// Copyright Douglas Gregor 2004. Use, modification and
// distribution is subject to the Boost Software License, Version
// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
// For more information, see http://www.boost.org/libs/utility
#ifndef BOOST_RESULT_OF_HPP
#define BOOST_RESULT_OF_HPP
#include <boost/config.hpp>
#include <boost/preprocessor/iteration/iterate.hpp>
#include <boost/preprocessor/punctuation/comma_if.hpp>
#include <boost/preprocessor/repetition/enum_params.hpp>
#include <boost/preprocessor/repetition/enum_shifted_params.hpp>
#include <boost/detail/workaround.hpp>
#include <boost/mpl/has_xxx.hpp>
#include <boost/mpl/if.hpp>
#include <boost/mpl/bool.hpp>
#include <boost/mpl/or.hpp>
#include <boost/type_traits/is_pointer.hpp>
#include <boost/type_traits/is_member_function_pointer.hpp>
#ifndef BOOST_RESULT_OF_NUM_ARGS
# define BOOST_RESULT_OF_NUM_ARGS 10
#endif
namespace boost {
template<typename F> struct result_of;
#if !defined(BOOST_NO_SFINAE) && !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
namespace detail {
BOOST_MPL_HAS_XXX_TRAIT_DEF(result_type)
template<typename F, typename FArgs, bool HasResultType> struct result_of_impl;
template<typename F> struct result_of_decltype_impl;
template<typename F>
struct result_of_void_impl
{
typedef void type;
};
template<typename R>
struct result_of_void_impl<R (*)(void)>
{
typedef R type;
};
template<typename R>
struct result_of_void_impl<R (&)(void)>
{
typedef R type;
};
template<typename F, typename FArgs>
struct result_of_impl<F, FArgs, true>
{
typedef typename F::result_type type;
};
template<typename FArgs>
struct is_function_with_no_args : mpl::false_ {};
template<typename F>
struct is_function_with_no_args<F(void)> : mpl::true_ {};
template<typename F, typename FArgs>
struct result_of_nested_result : F::template result<FArgs>
{};
template<typename F, typename FArgs>
struct result_of_impl<F, FArgs, false>
: mpl::if_<is_function_with_no_args<FArgs>,
result_of_void_impl<F>,
result_of_nested_result<F, FArgs> >::type
{};
} // end namespace detail
#define BOOST_PP_ITERATION_PARAMS_1 (3,(0,BOOST_RESULT_OF_NUM_ARGS,<boost/utility/detail/result_of_iterate.hpp>))
#include BOOST_PP_ITERATE()
#else
# define BOOST_NO_RESULT_OF 1
#endif
}
#endif // BOOST_RESULT_OF_HPP

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// Copyright (C) 2003, Fernando Luis Cacciola Carballal.
// Copyright (C) 2007, Tobias Schwinger.
//
// Use, modification, and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// See http://www.boost.org/lib/optional for documentation.
//
// You are welcome to contact the author at:
// fernando_cacciola@hotmail.com
//
#ifndef BOOST_UTILITY_TYPED_INPLACE_FACTORY_04APR2007_HPP
#ifndef BOOST_PP_IS_ITERATING
#include <boost/utility/detail/in_place_factory_prefix.hpp>
namespace boost {
class typed_in_place_factory_base {} ;
#define BOOST_PP_ITERATION_LIMITS (0, BOOST_MAX_INPLACE_FACTORY_ARITY)
#define BOOST_PP_FILENAME_1 <boost/utility/typed_in_place_factory.hpp>
#include BOOST_PP_ITERATE()
} // namespace boost
#include <boost/utility/detail/in_place_factory_suffix.hpp>
#define BOOST_UTILITY_TYPED_INPLACE_FACTORY_04APR2007_HPP
#else
#define N BOOST_PP_ITERATION()
template< class T BOOST_PP_ENUM_TRAILING_PARAMS(N,class A) >
class BOOST_PP_CAT(typed_in_place_factory,N)
:
public typed_in_place_factory_base
{
public:
typedef T value_type;
explicit BOOST_PP_CAT(typed_in_place_factory,N)
( BOOST_PP_ENUM_BINARY_PARAMS(N, A, const& a) )
#if N > 0
: BOOST_PP_ENUM(N, BOOST_DEFINE_INPLACE_FACTORY_CLASS_MEMBER_INIT, _)
#endif
{}
void* apply (void* address) const
{
return new(address) T( BOOST_PP_ENUM_PARAMS(N, m_a) );
}
void* apply (void* address, std::size_t n) const
{
for(void* next = address = this->apply(address); !! --n;)
this->apply(next = static_cast<char *>(next) + sizeof(T));
return address;
}
BOOST_PP_REPEAT(N, BOOST_DEFINE_INPLACE_FACTORY_CLASS_MEMBER_DECL, _)
};
template< class T BOOST_PP_ENUM_TRAILING_PARAMS(N, class A) >
inline BOOST_PP_CAT(typed_in_place_factory,N)<
T BOOST_PP_ENUM_TRAILING_PARAMS(N, A) >
in_place( BOOST_PP_ENUM_BINARY_PARAMS(N, A, const& a) )
{
return BOOST_PP_CAT(typed_in_place_factory,N)<
T BOOST_PP_ENUM_TRAILING_PARAMS(N, A) >( BOOST_PP_ENUM_PARAMS(N, a) );
}
#undef N
#endif
#endif

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// (C) Copyright 2002-2008, Fernando Luis Cacciola Carballal.
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// 21 Ago 2002 (Created) Fernando Cacciola
// 24 Dec 2007 (Refactored and worked around various compiler bugs) Fernando Cacciola, Niels Dekker
// 23 May 2008 (Fixed operator= const issue, added initialized_value) Niels Dekker, Fernando Cacciola
//
#ifndef BOOST_UTILITY_VALUE_INIT_21AGO2002_HPP
#define BOOST_UTILITY_VALUE_INIT_21AGO2002_HPP
// Note: The implementation of boost::value_initialized had to deal with the
// fact that various compilers haven't fully implemented value-initialization.
// The constructor of boost::value_initialized<T> works around these compiler
// issues, by clearing the bytes of T, before constructing the T object it
// contains. More details on these issues are at libs/utility/value_init.htm
#include <boost/aligned_storage.hpp>
#include <boost/detail/workaround.hpp>
#include <boost/static_assert.hpp>
#include <boost/type_traits/cv_traits.hpp>
#include <boost/type_traits/alignment_of.hpp>
#include <cstring>
#include <new>
namespace boost {
template<class T>
class value_initialized
{
private :
struct wrapper
{
#if !BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x592))
typename
#endif
remove_const<T>::type data;
};
mutable
#if !BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x592))
typename
#endif
aligned_storage<sizeof(wrapper), alignment_of<wrapper>::value>::type x;
wrapper * wrapper_address() const
{
return static_cast<wrapper *>( static_cast<void*>(&x));
}
public :
value_initialized()
{
std::memset(&x, 0, sizeof(x));
#ifdef BOOST_MSVC
#pragma warning(push)
#if _MSC_VER >= 1310
// When using MSVC 7.1 or higher, the following placement new expression may trigger warning C4345:
// "behavior change: an object of POD type constructed with an initializer of the form ()
// will be default-initialized". It is safe to ignore this warning when using value_initialized.
#pragma warning(disable: 4345)
#endif
#endif
new (wrapper_address()) wrapper();
#ifdef BOOST_MSVC
#pragma warning(pop)
#endif
}
value_initialized(value_initialized const & arg)
{
new (wrapper_address()) wrapper( static_cast<wrapper const &>(*(arg.wrapper_address())));
}
value_initialized & operator=(value_initialized const & arg)
{
// Assignment is only allowed when T is non-const.
BOOST_STATIC_ASSERT( ! is_const<T>::value );
*wrapper_address() = static_cast<wrapper const &>(*(arg.wrapper_address()));
return *this;
}
~value_initialized()
{
wrapper_address()->wrapper::~wrapper();
}
T& data() const
{
return wrapper_address()->data;
}
operator T&() const { return this->data(); }
} ;
template<class T>
T const& get ( value_initialized<T> const& x )
{
return x.data() ;
}
template<class T>
T& get ( value_initialized<T>& x )
{
return x.data() ;
}
class initialized_value_t
{
public :
template <class T> operator T() const
{
return get( value_initialized<T>() );
}
};
initialized_value_t const initialized_value = {} ;
} // namespace boost
#endif

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<td><a href="../../index.htm"><font color="#FFFFFF" size="4" face="Arial">Home</font></a></td>
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<h1>Boost Utility Library</h1>
<table border="1" cellpadding="5">
<tr>
<td><b><i>Header</i></b></td>
<td><b><i>Contents</i></b></td>
</tr>
<tr>
<td><a href="../../boost/utility.hpp"><code>boost/utility.hpp<br>
</code></a><a href="utility.htm">[Documentation]</a></td>
<td>Class <b>noncopyable</b> plus <b>next()</b> and <b>prior()</b> template
functions.</td>
</tr>
<tr>
<td><a href="../../boost/cast.hpp"><code>boost/cast.hpp</code></a><br>
<a href="cast.htm">[Documentation]</a></td>
<td><b>polymorphic_cast</b>, <b>implicit_cast</b>, and <b>numeric_cast</b>
function templates.
<p><i>[Beta.]</i></p>
</td>
</tr>
<tr>
<td><a href="../../boost/operators.hpp">boost/operators.hpp</a><br>
<a href="operators.htm">[Documentation]</a></td>
<td>Templates <b>equality_comparable</b>, <b>less_than_comparable</b>, <b>addable</b>,
and the like ease the task of defining comparison and arithmetic
operators, and iterators.</td>
</tr>
<tr>
<td><a href="../../boost/detail/type_traits.hpp">boost/type_traits.hpp</a><br>
[<a href="type_traits.htm">Documentation</a>]</td>
<td>Template classes that describe the fundamental properties of a type. [<a href="c++_type_traits.htm">DDJ
Article &quot;C++ type traits&quot;</a>]</td>
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<tr>
<td><a href="../../boost/detail/call_traits.hpp">boost/call_traits.hpp</a><br>
[<a href="call_traits.htm">Documentation</a>]</td>
<td>Template class call_traits&lt;T&gt;, that defines types used for passing
parameters to and from a proceedure.</td>
</tr>
<tr>
<td><a href="../../boost/detail/compressed_pair.hpp">boost/compressed_pair.hpp</a><br>
[<a href="compressed_pair.htm">Documentation</a>]</td>
<td>Template class compressed_pait&lt;T1, T2&gt; which pairs two values
using the empty member optimisation where appropriate.</td>
</tr>
</table>
<p>Revised <!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %B %Y" startspan -->27 July 2000<!--webbot bot="Timestamp" endspan i-checksum="18770" --></p>
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<h1><IMG SRC="../../boost.png" WIDTH="276" HEIGHT="86" align="center">Boost
Utility Library</h1>
<p>The Boost Utility Library isn't really a single library at all. It is just a
collection for components too small to be called libraries in their own right.</p>
<p>But that doesn't mean there isn't useful stuff here. Take a look:</p>
<blockquote>
<p>
<a href="assert.html">assert</a><br>
<a href="base_from_member.html">base_from_member</a><br>
<a href="call_traits.htm">call_traits</a><br>
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<a href="current_function.html">current_function</a><br>
<a href="enable_if.html">enable_if</a><br>
<a href="iterator_adaptors.htm">iterator_adaptors</a><br>
<a href="generator_iterator.htm">generator iterator adaptors</a><br>
<a href="operators.htm">operators</a><br>
<a href="throw_exception.html">throw_exception</a><br>
<a href="utility.htm">utility</a><br>
<a href="value_init.htm">value_init</a></p>
</blockquote>
<hr>
<p>© Copyright Beman Dawes, 2001</p>
<p>Distributed under the Boost Software License, Version 1.0. (See
accompanying file <a href="../../LICENSE_1_0.txt">
LICENSE_1_0.txt</a> or copy at
<a href="http://www.boost.org/LICENSE_1_0.txt">
www.boost.org/LICENSE_1_0.txt</a>)</p>
<p>Revised
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->07 November, 2006<!--webbot bot="Timestamp" endspan i-checksum="39368" --></p>
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// (C) Copyright Jeremy Siek 2000. Permission to copy, use, modify, sell and
// distribute this software is granted provided this copyright notice appears
// in all copies. This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
#include <functional>
#include <algorithm>
#include <iostream>
#include <boost/iterator_adaptors.hpp>
int
main(int, char*[])
{
// This is a simple example of using the transform_iterators class to
// generate iterators that multiply the value returned by dereferencing
// the iterator. In this case we are multiplying by 2.
int x[] = { 1, 2, 3, 4, 5, 6, 7, 8 };
typedef std::binder1st< std::multiplies<int> > Function;
typedef boost::transform_iterator<Function, int*,
boost::iterator<std::random_access_iterator_tag, int>
>::type doubling_iterator;
doubling_iterator i(x, std::bind1st(std::multiplies<int>(), 2)),
i_end(x + sizeof(x)/sizeof(int), std::bind1st(std::multiplies<int>(), 2));
std::cout << "multiplying the array by 2:" << std::endl;
while (i != i_end)
std::cout << *i++ << " ";
std::cout << std::endl;
// Here is an example of counting from 0 to 5 using the integer_range class.
boost::integer_range<int> r(0,5);
std::cout << "counting to from 0 to 4:" << std::endl;
std::copy(r.begin(), r.end(), std::ostream_iterator<int>(std::cout, " "));
std::cout << std::endl;
return 0;
}

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@ -1,629 +1,11 @@
<!-- Copyright David Abrahams 2004. Distributed under the Boost -->
<!-- Software License, Version 1.0. (See accompanying -->
<!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) -->
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<h1>Header
<a href="../../boost/pending/iterator_adaptors.hpp">boost/iterator_adaptors.hpp</a></h1>
<p>The file <tt>boost/iterator_adaptors.hpp</tt>
includes the main <tt>iterator_adaptors</tt> class and several other classes
for constructing commonly used iterator adaptors.</p>
<ul>
<li><a href="#iterator_adaptors"><tt>iterator_adaptors</tt></a>.
<li><a href="#iterator_adaptor"><tt>iterator_adaptor</tt></a>.
<li><a href="#transform_iterator"><tt>transform_iterator</tt></a>
<li><a href="#indirect_iterators"><tt>indirect_iterators</tt></a>
<li><a href="#reverse_iterators"><tt>reverse_iterators</tt></a>
<li><a href="#integer_range"><tt>integer_range</tt></a>
</ul>
<!-- put in something about Andrei Alexandrescu's contribution? -->
<p><a href="http://www.boost.org/people/dave_abrahams.htm">Dave
Abrahams</a> started the library, coming up with the idea to use
policy classes and how to handle the const/non-const iterator
interactions. He also contributed the <tt>indirect_iterators</tt> and
<tt>reverse_iterators</tt> classes.<br>
<a href="http://www.boost.org/people/jeremy_siek.htm">Jeremy Siek</a>
contributed <tt>transform_iterator</tt>, <tt>integer_range</tt>,
and this documentation.
<h3><a name="iterator_adaptors">The Iterator Adaptors Class</a></h3>
Implementing standard conforming iterators is a non-trivial task.
There are some fine-points such as iterator/const_iterator
interactions and there are the myriad of operators that should be
implemented but are easily forgotten such as
<tt>operator-&gt;()</tt>. The purpose of the
<tt>iterator_adaptors</tt> class is to make it easier to implement an
iterator class, and even easier to extend and adapt existing iterator
types. The <tt>iterator_adaptors</tt> class itself is not an adaptor
class but a <i>type generator</i>. It generates a pair of adaptor classes,
one class for the mutable iterator and one class for the const
iterator. The definition of the <tt>iterator_adaptors</tt> class is as
follows:
<p>
<TABLE BORDER=0 CELLSPACING=0 CELLPADDING=0 COLS=2>
<TR><TD WIDTH=30 VALIGN=TOP></TD><TD>
<PRE>
template &lt;class Iterator,
class ConstIterator,
class Traits = std::iterator_traits&lt;Iterator&gt;,
class ConstTraits = std::iterator_traits&lt;ConstIterator&gt;,
class Policies = default_iterator_policies&gt;
struct iterator_adaptors
{
typedef ... iterator;
typedef ... const_iterator;
};
</PRE></TD></TABLE>
<p>The <tt>Iterator</tt> and <tt>ConstIterator</tt> template parameters
are the iterator types that you want to adapt. The <tt>Traits</tt> and
<tt>ConstTraits</tt> must be iterator traits classes. The traits
parameters default to the specialization of the
<tt>std::iterator_traits</tt> class for the adapted iterators. If you
want the traits for your new iterator adaptor (<tt>value_type</tt>,
<tt>iterator_category</tt>, etc.) to be the same as the adapted
iterator then use the default, otherwise create your own traits
classes and pass them in <a href="#1">[1]</a>.
<p>The <tt>Policies</tt> class that you pass in will become the heart of
the iterator adaptor. The policy class determines how your new adaptor
class will behave. The <tt>Policies</tt> class must implement 3, 4, or
7 of the core iterator operations depending on whether you wish the
new iterator adaptor class to be a
<a href="http://www.sgi.com/Technology/STL/ForwardIterator.html">
ForwardIterator</a>,
<a href="http://www.sgi.com/Technology/STL/BidirectionalIterator.html">
BidirectionalIterator</a>, or <a
href="http://www.sgi.com/Technology/STL/RandomAccessIterator.html">
RandomAccessIterator</a>. Make sure that the
<tt>iterator_category</tt> type of the traits class you pass in
matches the category of iterator that you want to create. The default
policy class, <tt>default_iterator_policies</tt>, implements all 7 of
the core operations in the usual way. If you wish to create an
iterator adaptor that only changes a few of the iterator's behaviors,
then you can have your new policy class inherit from
<tt>default_iterator_policies</tt> to avoid retyping the usual
behaviours. You should also look at <tt>default_iterator_policies</tt>
as the &quot;boiler-plate&quot; for your own policy classes. The
following is definition of the <tt>default_iterator_policies</tt>
class:
<p>
<TABLE BORDER=0 CELLSPACING=0 CELLPADDING=0 COLS=2>
<TR><TD WIDTH=30 VALIGN=TOP></TD><TD>
<PRE>
struct default_iterator_policies
{
// required for a ForwardIterator
template &lt;class Reference, class Iterator&gt;
Reference dereference(type&lt;Reference&gt;, const Iterator& x) const
{ return *x; }
template &lt;class Iterator&gt;
void increment(Iterator& x) const
{ ++x; }
template &lt;class Iterator1, class Iterator2&gt;
bool equal(Iterator1& x, Iterator2& y) const
{ return x == y; }
// required for a BidirectionalIterator
template &lt;class Iterator&gt;
void decrement(Iterator& x) const
{ --x; }
// required for a RandomAccessIterator
template &lt;class Iterator, class DifferenceType&gt;
void advance(Iterator& x, DifferenceType n) const
{ x += n; }
template &lt;class Difference, class Iterator1, class Iterator2&gt;
Difference distance(type&lt;Difference&gt;, Iterator1& x, Iterator2& y) const
{ return y - x; }
template &lt;class Iterator1, class Iterator2&gt;
bool less(Iterator1& x, Iterator2& y) const
{ return x &lt; y; }
};
</PRE></TD></TABLE>
<p>
The generated iterator adaptor types will have the following
constructors.
<p>
<TABLE BORDER=0 CELLSPACING=0 CELLPADDING=0 COLS=2>
<TR><TD WIDTH=30 VALIGN=TOP></TD><TD>
<PRE>
<i>iterator</i>(const Iterator& i, const Policies& p = Policies())
<i>const_iterator</i>(const ConstIterator& i, const Policies& p = Policies())
</PRE></TD></TABLE>
<h3><a name="iterator_adaptor">The Iterator Adaptor Class</a></h3>
This is the class used inside of the <tt>iterator_adaptors</tt> type
generator. Use this class directly (instead of using
<tt>iterator_adaptors</tt>) when there is no difference between the
const and non-const versions of the iterator type. Often this is
because there is only a const (read-only) version of the iterator, as
is the case for <tt>std::set</tt>'s iterators. Use the same type for
the <tt>Iterator</tt> and <tt>NonconstIterator</tt> template
arguments.
<p>
<TABLE BORDER=0 CELLSPACING=0 CELLPADDING=0 COLS=2>
<TR><TD WIDTH=30 VALIGN=TOP></TD><TD>
<PRE>
template &lt;class Iterator,
class Policies = default_iterator_policies,
class NonconstIterator = Iterator,
class Traits = std::iterator_traits&lt;Iterator&gt; &gt;
struct iterator_adaptor;
</PRE></TD></TABLE>
<p>
Next we will look at some iterator adaptors that are examples of how
to use the iterator adaptors class, and that are useful iterator
adaptors in their own right.
<h3><a name="transform_iterator">The Transform Iterator Class</a></h3>
It is often useful to automatically apply some function to the value
returned by dereferencing (<tt>operator*()</tt>) an iterator. The
<tt>transform_iterators</tt> class makes it easy to create an iterator
adaptor that does just that.
First let us consider what the <tt>Policies</tt> class for the transform
iterator should look like. We are only changing one of the iterator
behaviours, so we will inherit from
<tt>default_iterator_policies</tt>. In addition, we will need a
function object to apply, so we will have a template parameter and a
data member for the function object. The function will take one
argument (the dereferenced value) and we will need to know the
<tt>result_type</tt> of the function, so <a
href="http://www.sgi.com/Technology/STL/AdaptableUnaryFunction.html">
AdaptableUnaryFunction</a> is the corrent concept to choose for the
function object type. Now for the heart of our iterator adaptor, we
implement the <tt>dereference</tt> method, applying the function
object to <tt>*i</tt>. The <tt>type&lt;Reference&gt;</tt> class is
there to tell you what the reference type of the iterator is, which is
handy when writing generic iterator adaptors such as this one <a
href="#2">[2]</a>.
<p>
<TABLE BORDER=0 CELLSPACING=0 CELLPADDING=0 COLS=2>
<TR><TD WIDTH=30 VALIGN=TOP></TD><TD>
<PRE>
template &lt;class AdaptableUnaryFunction&gt;
struct transform_iterator_policies : public default_iterator_policies
{
transform_iterator_policies(const AdaptableUnaryFunction& f) : m_f(f) { }
template &lt;class Reference, class Iterator&gt;
Reference dereference(type&lt;Reference&gt;, const Iterator& i) const
{ return m_f(*i); }
AdaptableUnaryFunction m_f;
};
</PRE></TD></TABLE>
Next we need to create the traits class for our new iterator. In some
situations you may need to create a separate traits class for the
const and non-const iterator types, but here a single traits class
will do. The <tt>value_type</tt> and <tt>reference</tt> type of our
transform iterator will be the <tt>result_type</tt> of the function
object. The <tt>difference_type</tt> and <tt>iterator_category</tt>
will be the same as the adapted iterator.
<p>
<TABLE BORDER=0 CELLSPACING=0 CELLPADDING=0 COLS=2>
<TR><TD WIDTH=30 VALIGN=TOP></TD><TD>
<PRE>
template &lt;class AdaptableUnaryFunction, class IteratorTraits&gt;
struct transform_iterator_traits {
typedef typename AdaptableUnaryFunction::result_type value_type;
typedef value_type reference;
typedef value_type* pointer;
typedef typename IteratorTraits::difference_type difference_type;
typedef typename IteratorTraits::iterator_category iterator_category;
};
</PRE></TD></TABLE>
The final step is to use the <tt>iterator_adaptor</tt> class to
construct our transform iterator. We will use the single iterator
adaptor version because we will not need to create both a mutable and
const version of the transform iterator. The transform iterator is
inherently a read-only iterator. The nicest way to package up our new
transform iterator is to create a type generator similar to
<tt>iterator_adaptor</tt>. The first template parameter will be the
type of the function object. The second parameter will be the adapted
iterator type. The third parameter is the trait class for
the adapted iterator. Inside the <tt>transform_iterators</tt> class
we use the <tt>transform_iterator_traits</tt> class defined above to
create the traits class for the new transform iterator. We then use
the <tt>iterator_adaptor</tt> class to extract the generated
iterator adaptor type.
<p>
<TABLE BORDER=0 CELLSPACING=0 CELLPADDING=0 COLS=2>
<TR><TD WIDTH=30 VALIGN=TOP></TD><TD>
<PRE>
template &lt;class AdaptableUnaryFunction,
class Iterator,
class Traits = std::iterator_traits&lt;Iterator&gt;
&gt;
struct transform_iterator
{
typedef transform_iterator_traits&lt;AdaptableUnaryFunction,Traits&gt;
TransTraits;
typedef iterator_adaptor&lt;Iterator, TransTraits,
transform_iterator_policies&lt;AdaptableUnaryFunction&gt; &gt;::type type;
};
</PRE></TD></TABLE>
<p>
The following is a simple example of how to use the
<tt>transform_iterators</tt> class to iterate through a range of
numbers, multiplying each of them by 2 when they are dereferenced.
<p>
<TABLE BORDER=0 CELLSPACING=0 CELLPADDING=0 COLS=2>
<TR><TD WIDTH=30 VALIGN=TOP></TD><TD>
<PRE>
#include &lt;functional&gt;
#include &lt;iostream&gt;
#include &lt;boost/iterator_adaptors.hpp&gt;
int
main(int, char*[])
{
int x[] = { 1, 2, 3, 4, 5, 6, 7, 8 };
typedef std::binder1st&lt; std::multiplies&lt;int&gt; &gt; Function;
typedef boost::transform_iterator&lt;Function, int*,
boost::iterator&lt;std::random_access_iterator_tag, int&gt;
&gt;::type doubling_iterator;
doubling_iterator i(x, std::bind1st(std::multiplies&lt;int&gt;(), 2)),
i_end(x + sizeof(x)/sizeof(int), std::bind1st(std::multiplies&lt;int&gt;(), 2));
std::cout &lt;&lt; "multiplying the array by 2:" &lt;&lt; std::endl;
while (i != i_end)
std::cout &lt;&lt; *i++ &lt;&lt; " ";
std::cout &lt;&lt; std::endl;
return 0;
}
</PRE></TD></TABLE>
<h3><a name="indirect_iterators">The Indirect Iterators Class</a></h3>
It is not all that uncommon to create data structures that consist of
pointers to pointers. For such a structure it might be nice to have an
iterator that applies a double-dereference inside the
<tt>operator*()</tt>. The implementation of this is similar to the
<tt>transform_iterators</tt><a href="#3">[3]</a>. We first create a
policies class which does a double-dereference in the
<tt>dereference()</tt> method. We then create a traits class, this
time also including a template parameter for the traits of the second
level iterators as well as the first. Lastly we wrap this up in the
type generator <tt>indirect_iterators</tt>, using
<tt>iterator_adaptors</tt> to do most of the work.
<p>
<TABLE BORDER=0 CELLSPACING=0 CELLPADDING=0 COLS=2>
<TR><TD WIDTH=30 VALIGN=TOP></TD><TD>
<PRE>
struct indirect_iterator_policies : public default_iterator_policies
{
template &lt;class Reference, class Iterator&gt;
Reference dereference(type&lt;Reference&gt;, const Iterator& x) const
{ return **x; }
};
template &lt;class IndirectIterator,
class IndirectTraits = std::iterator_traits&lt;IndirectIterator&gt;,
class Traits =
std::iterator_traits&lt;typename IndirectTraits::value_type&gt;
&gt;
struct indirect_traits
{
typedef typename IndirectTraits::difference_type difference_type;
typedef typename Traits::value_type value_type;
typedef typename Traits::pointer pointer;
typedef typename Traits::reference reference;
typedef typename IndirectTraits::iterator_category iterator_category;
};
template &lt;class IndirectIterator, class ConstIndirectIterator,
class IndirectTraits =
std::iterator_traits&lt;IndirectIterator&gt;,
class ConstIndirectTraits =
std::iterator_traits&lt;ConstIndirectIterator&gt;,
class Traits =
std::iterator_traits&lt;typename IndirectTraits::value_type&gt;
&gt;
struct indirect_iterators
{
typedef typename IndirectTraits::value_type Iterator;
typedef typename Traits::value_type ValueType;
typedef iterator_adaptors&lt;IndirectIterator, ConstIndirectIterator,
indirect_traits&lt;IndirectIterator, IndirectTraits, Traits&gt;,
indirect_traits&lt;ConstIndirectIterator, ConstIndirectTraits, Traits&gt;,
indirect_iterator_policies
&gt; Adaptors;
typedef typename Adaptors::iterator iterator;
typedef typename Adaptors::const_iterator const_iterator;
};
</PRE></TD></TABLE>
<h3><a name="reverse_iterators">The Reverse Iterators Class</a></h3>
<p>
Yes, there is already a <tt>reverse_iterator</tt> adaptor class
defined in the C++ Standard, but using the <tt>iterator_adaptors</tt>
class we can re-implement this classic adaptor in a more succinct and
elegant fashion. Also, this makes for a good example of using
<tt>iterator_adaptors</tt> that is in familiar territory.
<p>
The first step is to create the <tt>Policies</tt> class. As in the
<tt>std::reverse_iterator</tt> class, we need to flip all the
operations of the iterator. Increment will become decrement, advancing
by <tt>n</tt> will become retreating by <tt>n</tt>, etc.
<p>
<TABLE BORDER=0 CELLSPACING=0 CELLPADDING=0 COLS=2>
<TR><TD WIDTH=30 VALIGN=TOP></TD><TD>
<PRE>
struct reverse_iterator_policies
{
template &lt;class Reference, class Iterator&gt;
Reference dereference(type&lt;Reference&gt;, const Iterator& x) const
{ return *boost::prior(x); }
// this is equivalent to { Iterator tmp = x; return *--tmp; }
template &lt;class Iterator&gt;
void increment(Iterator& x) const
{ --x; }
template &lt;class Iterator&gt;
void decrement(Iterator& x) const
{ ++x; }
template &lt;class Iterator, class DifferenceType&gt;
void advance(Iterator& x, DifferenceType n) const
{ x -= n; }
template &lt;class Difference, class Iterator1, class Iterator2&gt;
Difference distance(type&lt;Difference&gt;, Iterator1& x, Iterator2& y) const
{ return x - y; }
template &lt;class Iterator1, class Iterator2&gt;
bool equal(Iterator1& x, Iterator2& y) const
{ return x == y; }
template &lt;class Iterator1, class Iterator2&gt;
bool less(Iterator1& x, Iterator2& y) const
{ return y &lt; x; }
};
</PRE></TD></TABLE>
Since the traits of the reverse iterator adaptor will be the same as
the adapted iterator's traits, we do not need to create new traits
classes as was the case for <tt>transform_iterator</tt>. We can skip to
the final stage of creating a type generator class for our reverse
iterators using the <tt>iterator_adaptor</tt> class.
<p>
<TABLE BORDER=0 CELLSPACING=0 CELLPADDING=0 COLS=2>
<TR><TD WIDTH=30 VALIGN=TOP></TD><TD>
<PRE>
template &lt;class Iterator, class ConstIterator,
class Traits = std::iterator_traits&lt;Iterator&gt;,
class ConstTraits = std::iterator_traits&lt;ConstIterator&gt;
&gt;
struct reverse_iterators
{
typedef iterator_adaptors&lt;Iterator,ConstIterator,Traits,ConstTraits,
reverse_iterator_policies&gt; Adaptor;
typedef typename Adaptor::iterator iterator;
typedef typename Adaptor::const_iterator const_iterator;
};
</PRE></TD></TABLE>
A typical use of the <tt>reverse_iterators</tt> class is in
user-defined container types. You can use the
<tt>reverse_iterators</tt> class to generate the reverse iterators for
your container.
<p>
<TABLE BORDER=0 CELLSPACING=0 CELLPADDING=0 COLS=2>
<TR><TD WIDTH=30 VALIGN=TOP></TD><TD>
<PRE>
class my_container {
...
typedef ... iterator;
typedef ... const_iterator;
typedef reverse_iterators&lt;iterator, const_iterator&gt; RevIters;
typedef typename RevIters::iterator reverse_iterator;
typedef typename RevIters::const_iterator const_reverse_iterator;
...
};
</PRE></TD></TABLE>
<h3><a name="integer_range">The Integer Range Class</a></h3>
The <tt>iterator_adaptors</tt> class can not only be used for adapting
iterators, but it can also be used to take a non-iterator type and use
it to build an iterator. An especially simple example of this is
turning an integer type into an iterator, a counting iterator. The
builtin integer types of C++ are almost iterators. They have
<tt>operator++()</tt>, <tt>operator--()</tt>, etc. The one operator
they are lacking is the <tt>operator*()</tt>, which we will want to
simply return the current value of the integer. The following few
lines of code implement the policy and traits class for the counting
iterator.
<p>
<TABLE BORDER=0 CELLSPACING=0 CELLPADDING=0 COLS=2>
<TR><TD WIDTH=30 VALIGN=TOP></TD><TD>
<PRE>
struct counting_iterator_policies : public default_iterator_policies
{
template &lt;class IntegerType&gt;
IntegerType dereference(type&lt;IntegerType&gt;, const IntegerType& i) const
{ return i; }
};
template &lt;class IntegerType&gt;
struct counting_iterator_traits {
typedef IntegerType value_type;
typedef IntegerType reference;
typedef value_type* pointer;
typedef std::ptrdiff_t difference_type;
typedef std::random_access_iterator_tag iterator_category;
};
</PRE></TD></TABLE>
Typically we will want to count the integers in some range, so a nice
interface would be to have a fake container that represents the range
of integers. The following is the definition of such a class called
<tt>integer_range</tt>.
<p>
<TABLE BORDER=0 CELLSPACING=0 CELLPADDING=0 COLS=2>
<TR><TD WIDTH=30 VALIGN=TOP></TD><TD>
<PRE>
template &lt;class IntegerType&gt;
struct integer_range {
typedef typename iterator_adaptor&lt;IntegerType,
counting_iterator_traits&lt;IntegerType&gt;,
counting_iterator_policies &gt;::type iterator;
typedef iterator const_iterator;
typedef IntegerType value_type;
typedef std::ptrdiff_t difference_type;
typedef IntegerType reference;
typedef IntegerType* pointer;
typedef IntegerType size_type;
integer_range(IntegerType start, IntegerType finish)
: m_start(start), m_finish(finish) { }
iterator begin() const { return iterator(m_start); }
iterator end() const { return iterator(m_finish); }
size_type size() const { return m_finish - m_start; }
bool empty() const { return m_finish == m_start; }
void swap(integer_range& x) {
std::swap(m_start, x.m_start);
std::swap(m_finish, x.m_finish);
}
protected:
IntegerType m_start, m_finish;
};
</PRE></TD></TABLE>
<p>
The following is an example of how to use the
<tt>integer_range</tt> class to count from 0 to 4.
<p>
<TABLE BORDER=0 CELLSPACING=0 CELLPADDING=0 COLS=2>
<TR><TD WIDTH=30 VALIGN=TOP></TD><TD>
<PRE>
boost::integer_range&lt;int&gt; r(0,5);
cout &lt;&lt; "counting to from 0 to 4:" &lt;&lt; endl;
std::copy(r.begin(), r.end(), ostream_iterator&lt;int&gt;(cout, " "));
cout &lt;&lt; endl;
</PRE></TD></TABLE>
<h3>Challenge</h3>
<p>
There is an unlimited number of ways the the
<tt>iterator_adaptors</tt> class can be used to create iterators. One
interesting exercise would be to re-implement the iterators of
<tt>std::list</tt> and <tt>std::slist</tt> using
<tt>iterator_adaptors</tt>, where the adapted <tt>Iterator</tt> types
would be node pointers.
<h3>Notes</h3>
<p>
<a name="1">[1]</a>
If your compiler does not support partial specialization and hence
does not have a working <tt>std::iterator_traits</tt> class, you will
not be able to use the defaults and will need to supply your own
<tt>Traits</tt> and <tt>ConstTraits</tt> classes.
<p>
<a name="2">[2]</a>
The reference type could also be obtained from
<tt>std::iterator_traits</tt>, but that is not portable on compilers
that do not support partial specialization.
<p>
<a name="3">[3]</a>
It would have been more elegant to implement <tt>indirect_iterators</tt>
using <tt>transform_iterators</tt>, but for subtle reasons that would require
the use of <tt>boost::remove_cv</tt> which is not portable.
<h3>Implementation Notes</h3>
The code is somewhat complicated because there are three iterator
adaptor class: <tt>forward_iterator_adaptor</tt>,
<tt>bidirectional_iterator_adaptor</tt>, and
<tt>random_access_iterator_adaptor</tt>. The alternative would be to
just have one iterator adaptor equivalent to the
<tt>random_access_iterator_adaptor</tt>. The reason for going with
the three adaptors is that according to 14.5.3p5 in the C++ Standard,
friend functions defined inside a template class body are instantiated
when the template class is instantiated. This means that if we only
used the one iterator adaptor, then if the adapted iterator did not
meet all of the requirements for a
<a href="http://www.sgi.com/Technology/STL/RandomAccessIterator.html">
RandomAccessIterator</a> then a compiler error should occur. Many
current compilers in fact do not instantiate the friend functions
unless used, so we could get away with the one iterator adaptor in
most cases. However, out of respect for the standard this implementation
uses the three adaptors.
<hr>
<p>Revised <!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %b %Y" startspan -->27 Sep 2000<!--webbot bot="Timestamp" endspan i-checksum="14936" --></p>
<p><EFBFBD> Copyright Jeremy Siek 2000. Permission to copy, use,
modify, sell and distribute this document is granted provided this copyright
notice appears in all copies. This document is provided &quot;as is&quot;
without express or implied warranty, and with no claim as to its suitability for
any purpose.</p>
<body>
This documentation moved to <a href="../iterator/doc/index.html">../iterator/doc/index.html</a>.
</body>
</html>

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@ -1,24 +1,36 @@
// Demonstrate and test boost/operators.hpp on std::iterators --------------//
// (C) Copyright Jeremy Siek 1999. Permission to copy, use, modify,
// sell and distribute this software is granted provided this
// copyright notice appears in all copies. This software is provided
// "as is" without express or implied warranty, and with no claim as
// to its suitability for any purpose.
// (C) Copyright Jeremy Siek 1999.
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
// See http://www.boost.org for most recent version including documentation.
// Revision History
// 29 May 01 Factored implementation, added comparison tests, use Test Tools
// library (Daryle Walker)
// 12 Dec 99 Initial version with iterator operators (Jeremy Siek)
#include <string>
#include <iostream>
using namespace std;
#define BOOST_INCLUDE_MAIN
#include <boost/test/test_tools.hpp> // for main
#include <boost/operators.hpp>
using namespace boost;
#include <boost/config.hpp> // for BOOST_STATIC_CONSTANT
#include <boost/cstdlib.hpp> // for boost::exit_success
#include <boost/operators.hpp> // for boost::random_access_iterator_helper
#include <cstddef> // for std::ptrdiff_t, std::size_t
#include <cstring> // for std::strcmp
#include <iostream> // for std::cout (std::endl, ends, and flush indirectly)
#include <string> // for std::string
#include <sstream> // for std::stringstream
# ifdef BOOST_NO_STDC_NAMESPACE
namespace std { using ::strcmp; }
# endif
// Iterator test class
template <class T, class R, class P>
struct test_iter
: public boost::random_access_iterator_helper<
@ -29,7 +41,7 @@ struct test_iter
typedef std::ptrdiff_t Distance;
public:
test_iter(T* i) : _i(i) { }
explicit test_iter(T* i =0) : _i(i) { }
test_iter(const self& x) : _i(x._i) { }
self& operator=(const self& x) { _i = x._i; return *this; }
Reference operator*() const { return *_i; }
@ -43,127 +55,270 @@ public:
return x._i - y._i;
}
protected:
T* _i;
P _i;
};
int
main()
// Iterator operator testing classes
class test_opr_base
{
string array[] = { "apple", "orange", "pear", "peach", "grape", "plum" };
{
test_iter<string,string&,string*> i = array,
ie = array + sizeof(array)/sizeof(string);
protected:
// Test data and types
BOOST_STATIC_CONSTANT( std::size_t, fruit_length = 6u );
// Tests for all of the operators added by random_access_iterator_helper
typedef std::string fruit_array_type[ fruit_length ];
// test i++
while (i != ie)
cout << *i++ << " ";
cout << endl;
i = array;
static fruit_array_type fruit;
// test i--
while (ie != i) {
ie--;
cout << *ie << " ";
}
cout << endl;
ie = array + sizeof(array)/sizeof(string);
}; // test_opr_base
// test i->m
while (i != ie) {
cout << i->size() << " ";
++i;
}
cout << endl;
i = array;
#ifndef BOOST_NO_INCLASS_MEMBER_INITIALIZATION
// A definition is required even for integral static constants
const std::size_t test_opr_base::fruit_length;
#endif
// test i + n
while (i < ie) {
cout << *i << " ";
i = i + 2;
}
cout << endl;
i = array;
template <typename T, typename R = T&, typename P = T*>
class test_opr
: public test_opr_base
{
typedef test_opr<T, R, P> self_type;
// test n + i
while (i < ie) {
cout << *i << " ";
i = ptrdiff_t(2) + i;
}
cout << endl;
i = array;
public:
// Types
typedef T value_type;
typedef R reference;
typedef P pointer;
// test i - n
while (ie > i) {
ie = ie - 2;
cout << *ie << " ";
}
cout << endl;
ie = array + sizeof(array)/sizeof(string);
typedef test_iter<T, R, P> iter_type;
// test i[n]
for (std::size_t j = 0; j < sizeof(array)/sizeof(string); ++j)
cout << i[j] << " ";
cout << endl;
}
{
test_iter<string, const string&, const string*> i = array,
ie = array + sizeof(array)/sizeof(string);
// Test controller
static void master_test( char const name[] );
// Tests for all of the operators added by random_access_iterator_helper
private:
// Test data
static iter_type const fruit_begin;
static iter_type const fruit_end;
// test i++
while (i != ie)
cout << *i++ << " ";
cout << endl;
i = array;
// Test parts
static void post_increment_test();
static void post_decrement_test();
static void indirect_referral_test();
static void offset_addition_test();
static void reverse_offset_addition_test();
static void offset_subtraction_test();
static void comparison_test();
static void indexing_test();
// test i--
while (ie != i) {
ie--;
cout << *ie << " ";
}
cout << endl;
ie = array + sizeof(array)/sizeof(string);
}; // test_opr
// test i->m
while (i != ie) {
cout << i->size() << " ";
++i;
}
cout << endl;
i = array;
// test i + n
while (i < ie) {
cout << *i << " ";
i = i + 2;
}
cout << endl;
i = array;
// Class-static data definitions
test_opr_base::fruit_array_type
test_opr_base::fruit = { "apple", "orange", "pear", "peach", "grape", "plum" };
// test n + i
while (i < ie) {
cout << *i << " ";
i = ptrdiff_t(2) + i;
}
cout << endl;
i = array;
template <typename T, typename R, typename P>
typename test_opr<T, R, P>::iter_type const
test_opr<T, R, P>::fruit_begin = test_iter<T,R,P>( fruit );
// test i - n
while (ie > i) {
ie = ie - 2;
cout << *ie << " ";
}
cout << endl;
ie = array + sizeof(array)/sizeof(string);
template <typename T, typename R, typename P>
typename test_opr<T, R, P>::iter_type const
test_opr<T, R, P>::fruit_end = test_iter<T,R,P>( fruit + fruit_length );
// test i[n]
for (std::size_t j = 0; j < sizeof(array)/sizeof(string); ++j)
cout << i[j] << " ";
cout << endl;
}
return 0;
// Main testing function
int
test_main( int , char * [] )
{
using std::string;
typedef test_opr<string, string &, string *> test1_type;
typedef test_opr<string, string const &, string const *> test2_type;
test1_type::master_test( "non-const string" );
test2_type::master_test( "const string" );
return boost::exit_success;
}
// Tests for all of the operators added by random_access_iterator_helper
template <typename T, typename R, typename P>
void
test_opr<T, R, P>::master_test
(
char const name[]
)
{
std::cout << "Doing test run for " << name << '.' << std::endl;
post_increment_test();
post_decrement_test();
indirect_referral_test();
offset_addition_test();
reverse_offset_addition_test();
offset_subtraction_test();
comparison_test();
indexing_test();
}
// Test post-increment
template <typename T, typename R, typename P>
void
test_opr<T, R, P>::post_increment_test
(
)
{
std::cout << "\tDoing post-increment test." << std::endl;
std::stringstream oss;
for ( iter_type i = fruit_begin ; i != fruit_end ; )
{
oss << *i++ << ' ';
}
BOOST_CHECK( oss.str() == "apple orange pear peach grape plum ");
}
// Test post-decrement
template <typename T, typename R, typename P>
void
test_opr<T, R, P>::post_decrement_test
(
)
{
std::cout << "\tDoing post-decrement test." << std::endl;
std::stringstream oss;
for ( iter_type i = fruit_end ; i != fruit_begin ; )
{
i--;
oss << *i << ' ';
}
BOOST_CHECK( oss.str() == "plum grape peach pear orange apple ");
}
// Test indirect structure referral
template <typename T, typename R, typename P>
void
test_opr<T, R, P>::indirect_referral_test
(
)
{
std::cout << "\tDoing indirect reference test." << std::endl;
std::stringstream oss;
for ( iter_type i = fruit_begin ; i != fruit_end ; ++i )
{
oss << i->size() << ' ';
}
BOOST_CHECK( oss.str() == "5 6 4 5 5 4 ");
}
// Test offset addition
template <typename T, typename R, typename P>
void
test_opr<T, R, P>::offset_addition_test
(
)
{
std::cout << "\tDoing offset addition test." << std::endl;
std::ptrdiff_t const two = 2;
std::stringstream oss;
for ( iter_type i = fruit_begin ; i != fruit_end ; i = i + two )
{
oss << *i << ' ';
}
BOOST_CHECK( oss.str() == "apple pear grape ");
}
// Test offset addition, in reverse order
template <typename T, typename R, typename P>
void
test_opr<T, R, P>::reverse_offset_addition_test
(
)
{
std::cout << "\tDoing reverse offset addition test." << std::endl;
std::ptrdiff_t const two = 2;
std::stringstream oss;
for ( iter_type i = fruit_begin ; i != fruit_end ; i = two + i )
{
oss << *i << ' ';
}
BOOST_CHECK( oss.str() == "apple pear grape ");
}
// Test offset subtraction
template <typename T, typename R, typename P>
void
test_opr<T, R, P>::offset_subtraction_test
(
)
{
std::cout << "\tDoing offset subtraction test." << std::endl;
std::ptrdiff_t const two = 2;
std::stringstream oss;
for ( iter_type i = fruit_end ; fruit_begin < i ; )
{
i = i - two;
if ( (fruit_begin < i) || (fruit_begin == i) )
{
oss << *i << ' ';
}
}
BOOST_CHECK( oss.str() == "grape pear apple ");
}
// Test comparisons
template <typename T, typename R, typename P>
void
test_opr<T, R, P>::comparison_test
(
)
{
using std::cout;
using std::ptrdiff_t;
cout << "\tDoing comparison tests.\n\t\tPass:";
for ( iter_type i = fruit_begin ; i != fruit_end ; ++i )
{
ptrdiff_t const i_offset = i - fruit_begin;
cout << ' ' << *i << std::flush;
for ( iter_type j = fruit_begin ; j != fruit_end ; ++j )
{
ptrdiff_t const j_offset = j - fruit_begin;
BOOST_CHECK( (i != j) == (i_offset != j_offset) );
BOOST_CHECK( (i > j) == (i_offset > j_offset) );
BOOST_CHECK( (i <= j) == (i_offset <= j_offset) );
BOOST_CHECK( (i >= j) == (i_offset >= j_offset) );
}
}
cout << std::endl;
}
// Test indexing
template <typename T, typename R, typename P>
void
test_opr<T, R, P>::indexing_test
(
)
{
std::cout << "\tDoing indexing test." << std::endl;
std::stringstream oss;
for ( std::size_t k = 0u ; k < fruit_length ; ++k )
{
oss << fruit_begin[ k ] << ' ';
}
BOOST_CHECK( oss.str() == "apple orange pear peach grape plum ");
}

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@ -1,10 +1,8 @@
// boost class noncopyable test program ------------------------------------//
// (C) Copyright boost.org 1999. Permission to copy, use, modify, sell
// and distribute this software is granted provided this copyright
// notice appears in all copies. This software is provided "as is" without
// express or implied warranty, and with no claim as to its suitability for
// any purpose.
// (C) Copyright Beman Dawes 1999. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
// See http://www.boost.org for most recent version including documentation.
@ -12,7 +10,7 @@
// 9 Jun 99 Add unnamed namespace
// 2 Jun 99 Initial Version
#include <boost/utility.hpp>
#include <boost/noncopyable.hpp>
#include <iostream>
// This program demonstrates compiler errors resulting from trying to copy
@ -20,7 +18,7 @@
namespace
{
class DontTreadOnMe : boost::noncopyable
class DontTreadOnMe : private boost::noncopyable
{
public:
DontTreadOnMe() { std::cout << "defanged!" << std::endl; }
@ -35,4 +33,4 @@ int main()
object1 = object2;
return 0;
} // main

405
numeric_traits_test.cpp Normal file
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@ -0,0 +1,405 @@
// (C) Copyright David Abrahams 2001.
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
// See http://www.boost.org for most recent version including documentation.
// Revision History
// 1 Apr 2001 Fixes for ICL; use BOOST_STATIC_CONSTANT
// 11 Feb 2001 Fixes for Borland (David Abrahams)
// 23 Jan 2001 Added test for wchar_t (David Abrahams)
// 23 Jan 2001 Now statically selecting a test for signed numbers to avoid
// warnings with fancy compilers. Added commentary and
// additional dumping of traits data for tested types (David
// Abrahams).
// 21 Jan 2001 Initial version (David Abrahams)
#include <boost/detail/numeric_traits.hpp>
#include <cassert>
#include <boost/type_traits.hpp>
#include <boost/static_assert.hpp>
#include <boost/cstdint.hpp>
#include <boost/utility.hpp>
#include <boost/lexical_cast.hpp>
#include <climits>
#include <typeinfo>
#include <iostream>
#include <string>
#ifndef BOOST_NO_LIMITS
# include <limits>
#endif
// =================================================================================
// template class complement_traits<Number> --
//
// statically computes the max and min for 1s and 2s-complement binary
// numbers. This helps on platforms without <limits> support. It also shows
// an example of a recursive template that works with MSVC!
//
template <unsigned size> struct complement; // forward
// The template complement, below, does all the real work, using "poor man's
// partial specialization". We need complement_traits_aux<> so that MSVC doesn't
// complain about undefined min/max as we're trying to recursively define them.
template <class Number, unsigned size>
struct complement_traits_aux
{
BOOST_STATIC_CONSTANT(Number, max = complement<size>::template traits<Number>::max);
BOOST_STATIC_CONSTANT(Number, min = complement<size>::template traits<Number>::min);
};
template <unsigned size>
struct complement
{
template <class Number>
struct traits
{
private:
// indirection through complement_traits_aux necessary to keep MSVC happy
typedef complement_traits_aux<Number, size - 1> prev;
public:
#if defined(__GNUC__) && __GNUC__ == 4 && __GNUC_MINOR__ == 0 && __GNUC_PATCHLEVEL__ == 2
// GCC 4.0.2 ICEs on these C-style casts
BOOST_STATIC_CONSTANT(Number, max =
Number((prev::max) << CHAR_BIT)
+ Number(UCHAR_MAX));
BOOST_STATIC_CONSTANT(Number, min = Number((prev::min) << CHAR_BIT));
#else
BOOST_STATIC_CONSTANT(Number, max =
Number(Number(prev::max) << CHAR_BIT)
+ Number(UCHAR_MAX));
BOOST_STATIC_CONSTANT(Number, min = Number(Number(prev::min) << CHAR_BIT));
#endif
};
};
// Template class complement_base<> -- defines values for min and max for
// complement<1>, at the deepest level of recursion. Uses "poor man's partial
// specialization" again.
template <bool is_signed> struct complement_base;
template <> struct complement_base<false>
{
template <class Number>
struct values
{
BOOST_STATIC_CONSTANT(Number, min = 0);
BOOST_STATIC_CONSTANT(Number, max = UCHAR_MAX);
};
};
template <> struct complement_base<true>
{
template <class Number>
struct values
{
BOOST_STATIC_CONSTANT(Number, min = SCHAR_MIN);
BOOST_STATIC_CONSTANT(Number, max = SCHAR_MAX);
};
};
// Base specialization of complement, puts an end to the recursion.
template <>
struct complement<1>
{
template <class Number>
struct traits
{
BOOST_STATIC_CONSTANT(bool, is_signed = boost::detail::is_signed<Number>::value);
BOOST_STATIC_CONSTANT(Number, min =
complement_base<is_signed>::template values<Number>::min);
BOOST_STATIC_CONSTANT(Number, max =
complement_base<is_signed>::template values<Number>::max);
};
};
// Now here's the "pretty" template you're intended to actually use.
// complement_traits<Number>::min, complement_traits<Number>::max are the
// minimum and maximum values of Number if Number is a built-in integer type.
template <class Number>
struct complement_traits
{
BOOST_STATIC_CONSTANT(Number, max = (complement_traits_aux<Number, sizeof(Number)>::max));
BOOST_STATIC_CONSTANT(Number, min = (complement_traits_aux<Number, sizeof(Number)>::min));
};
// =================================================================================
// Support for streaming various numeric types in exactly the format I want. I
// needed this in addition to all the assertions so that I could see exactly
// what was going on.
//
// Numbers go through a 2-stage conversion process (by default, though, no real
// conversion).
//
template <class T> struct stream_as {
typedef T t1;
typedef T t2;
};
// char types first get converted to unsigned char, then to unsigned.
template <> struct stream_as<char> {
typedef unsigned char t1;
typedef unsigned t2;
};
template <> struct stream_as<unsigned char> {
typedef unsigned char t1; typedef unsigned t2;
};
template <> struct stream_as<signed char> {
typedef unsigned char t1; typedef unsigned t2;
};
#if defined(BOOST_MSVC_STD_ITERATOR) // No intmax streaming built-in
// With this library implementation, __int64 and __uint64 get streamed as strings
template <> struct stream_as<boost::uintmax_t> {
typedef std::string t1;
typedef std::string t2;
};
template <> struct stream_as<boost::intmax_t> {
typedef std::string t1;
typedef std::string t2;
};
#endif
// Standard promotion process for streaming
template <class T> struct promote
{
static typename stream_as<T>::t1 from(T x) {
typedef typename stream_as<T>::t1 t1;
return t1(x);
}
};
#if defined(BOOST_MSVC_STD_ITERATOR) // No intmax streaming built-in
// On this platform, stream them as long/unsigned long if they fit.
// Otherwise, write a string.
template <> struct promote<boost::uintmax_t> {
std::string static from(const boost::uintmax_t x) {
if (x > ULONG_MAX)
return std::string("large unsigned value");
else
return boost::lexical_cast<std::string>((unsigned long)x);
}
};
template <> struct promote<boost::intmax_t> {
std::string static from(const boost::intmax_t x) {
if (x > boost::intmax_t(ULONG_MAX))
return std::string("large positive signed value");
else if (x >= 0)
return boost::lexical_cast<std::string>((unsigned long)x);
if (x < boost::intmax_t(LONG_MIN))
return std::string("large negative signed value");
else
return boost::lexical_cast<std::string>((long)x);
}
};
#endif
// This is the function which converts types to the form I want to stream them in.
template <class T>
typename stream_as<T>::t2 stream_number(T x)
{
return promote<T>::from(x);
}
// =================================================================================
//
// Tests for built-in signed and unsigned types
//
// Tag types for selecting tests
struct unsigned_tag {};
struct signed_tag {};
// Tests for unsigned numbers. The extra default Number parameter works around
// an MSVC bug.
template <class Number>
void test_aux(unsigned_tag, Number*)
{
typedef typename boost::detail::numeric_traits<Number>::difference_type difference_type;
BOOST_STATIC_ASSERT(!boost::detail::is_signed<Number>::value);
BOOST_STATIC_ASSERT(
(sizeof(Number) < sizeof(boost::intmax_t))
| (boost::is_same<difference_type, boost::intmax_t>::value));
#if defined(__GNUC__) && __GNUC__ == 4 && __GNUC_MINOR__ == 0 && __GNUC_PATCHLEVEL__ == 2
// GCC 4.0.2 ICEs on this C-style cases
BOOST_STATIC_ASSERT((complement_traits<Number>::max) > Number(0));
BOOST_STATIC_ASSERT((complement_traits<Number>::min) == Number(0));
#else
// Force casting to Number here to work around the fact that it's an enum on MSVC
BOOST_STATIC_ASSERT(Number(complement_traits<Number>::max) > Number(0));
BOOST_STATIC_ASSERT(Number(complement_traits<Number>::min) == Number(0));
#endif
const Number max = complement_traits<Number>::max;
const Number min = complement_traits<Number>::min;
const Number test_max = (sizeof(Number) < sizeof(boost::intmax_t))
? max
: max / 2 - 1;
std::cout << std::hex << "(unsigned) min = " << stream_number(min) << ", max = "
<< stream_number(max) << "..." << std::flush;
std::cout << "difference_type = " << typeid(difference_type).name() << "..."
<< std::flush;
difference_type d1 = boost::detail::numeric_distance(Number(0), test_max);
difference_type d2 = boost::detail::numeric_distance(test_max, Number(0));
std::cout << "0->" << stream_number(test_max) << "==" << std::dec << stream_number(d1) << "; "
<< std::hex << stream_number(test_max) << "->0==" << std::dec << stream_number(d2) << "..." << std::flush;
assert(d1 == difference_type(test_max));
assert(d2 == -difference_type(test_max));
}
// Tests for signed numbers. The extra default Number parameter works around an
// MSVC bug.
struct out_of_range_tag {};
struct in_range_tag {};
// This test morsel gets executed for numbers whose difference will always be
// representable in intmax_t
template <class Number>
void signed_test(in_range_tag, Number*)
{
BOOST_STATIC_ASSERT(boost::detail::is_signed<Number>::value);
typedef typename boost::detail::numeric_traits<Number>::difference_type difference_type;
const Number max = complement_traits<Number>::max;
const Number min = complement_traits<Number>::min;
difference_type d1 = boost::detail::numeric_distance(min, max);
difference_type d2 = boost::detail::numeric_distance(max, min);
std::cout << stream_number(min) << "->" << stream_number(max) << "==";
std::cout << std::dec << stream_number(d1) << "; ";
std::cout << std::hex << stream_number(max) << "->" << stream_number(min)
<< "==" << std::dec << stream_number(d2) << "..." << std::flush;
assert(d1 == difference_type(max) - difference_type(min));
assert(d2 == difference_type(min) - difference_type(max));
}
// This test morsel gets executed for numbers whose difference may exceed the
// capacity of intmax_t.
template <class Number>
void signed_test(out_of_range_tag, Number*)
{
BOOST_STATIC_ASSERT(boost::detail::is_signed<Number>::value);
typedef typename boost::detail::numeric_traits<Number>::difference_type difference_type;
const Number max = complement_traits<Number>::max;
const Number min = complement_traits<Number>::min;
difference_type min_distance = complement_traits<difference_type>::min;
difference_type max_distance = complement_traits<difference_type>::max;
const Number n1 = Number(min + max_distance);
const Number n2 = Number(max + min_distance);
difference_type d1 = boost::detail::numeric_distance(min, n1);
difference_type d2 = boost::detail::numeric_distance(max, n2);
std::cout << stream_number(min) << "->" << stream_number(n1) << "==";
std::cout << std::dec << stream_number(d1) << "; ";
std::cout << std::hex << stream_number(max) << "->" << stream_number(n2)
<< "==" << std::dec << stream_number(d2) << "..." << std::flush;
assert(d1 == max_distance);
assert(d2 == min_distance);
}
template <class Number>
void test_aux(signed_tag, Number*)
{
typedef typename boost::detail::numeric_traits<Number>::difference_type difference_type;
BOOST_STATIC_ASSERT(boost::detail::is_signed<Number>::value);
BOOST_STATIC_ASSERT(
(sizeof(Number) < sizeof(boost::intmax_t))
| (boost::is_same<difference_type, Number>::value));
#if defined(__GNUC__) && __GNUC__ == 4 && __GNUC_MINOR__ == 0 && __GNUC_PATCHLEVEL__ == 2
// GCC 4.0.2 ICEs on this cast
BOOST_STATIC_ASSERT((complement_traits<Number>::max) > Number(0));
BOOST_STATIC_ASSERT((complement_traits<Number>::min) < Number(0));
#else
// Force casting to Number here to work around the fact that it's an enum on MSVC
BOOST_STATIC_ASSERT(Number(complement_traits<Number>::max) > Number(0));
BOOST_STATIC_ASSERT(Number(complement_traits<Number>::min) < Number(0));
#endif
const Number max = complement_traits<Number>::max;
const Number min = complement_traits<Number>::min;
std::cout << std::hex << "min = " << stream_number(min) << ", max = "
<< stream_number(max) << "..." << std::flush;
std::cout << "difference_type = " << typeid(difference_type).name() << "..."
<< std::flush;
typedef typename boost::detail::if_true<
(sizeof(Number) < sizeof(boost::intmax_t))>
::template then<
in_range_tag,
out_of_range_tag
>::type
range_tag;
signed_test<Number>(range_tag(), 0);
}
// Test for all numbers. The extra default Number parameter works around an MSVC
// bug.
template <class Number>
void test(Number* = 0)
{
std::cout << "testing " << typeid(Number).name() << ":\n"
#ifndef BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS
<< "is_signed: " << (std::numeric_limits<Number>::is_signed ? "true\n" : "false\n")
<< "is_bounded: " << (std::numeric_limits<Number>::is_bounded ? "true\n" : "false\n")
<< "digits: " << std::numeric_limits<Number>::digits << "\n"
#endif
<< "..." << std::flush;
// factoring out difference_type for the assert below confused Borland :(
typedef boost::detail::is_signed<
#if !defined(BOOST_MSVC) || BOOST_MSVC > 1300
typename
#endif
boost::detail::numeric_traits<Number>::difference_type
> is_signed;
BOOST_STATIC_ASSERT(is_signed::value);
typedef typename boost::detail::if_true<
boost::detail::is_signed<Number>::value
>::template then<signed_tag, unsigned_tag>::type signedness;
test_aux<Number>(signedness(), 0);
std::cout << "passed" << std::endl;
}
int main()
{
test<char>();
test<unsigned char>();
test<signed char>();
test<wchar_t>();
test<short>();
test<unsigned short>();
test<int>();
test<unsigned int>();
test<long>();
test<unsigned long>();
#if defined(BOOST_HAS_LONG_LONG) && !defined(BOOST_NO_INTEGRAL_INT64_T)
test< ::boost::long_long_type>();
test< ::boost::ulong_long_type>();
#elif defined(BOOST_MSVC)
// The problem of not having compile-time static class constants other than
// enums prevents this from working, since values get truncated.
// test<boost::uintmax_t>();
// test<boost::intmax_t>();
#endif
return 0;
}

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134
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// Copyright David Abrahams and Aleksey Gurtovoy
// 2002-2004. Distributed under the Boost Software License, Version
// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
// compile-time test for "boost/ref.hpp" header content
// see 'ref_test.cpp' for run-time part
#include <boost/ref.hpp>
#include <boost/type_traits/is_same.hpp>
#include <boost/type_traits/remove_const.hpp>
#include <boost/static_assert.hpp>
#include <boost/detail/workaround.hpp>
#include <boost/mpl/assert.hpp>
namespace {
template< typename T, typename U >
void ref_test(boost::reference_wrapper<U>)
{
typedef typename boost::reference_wrapper<U>::type type;
BOOST_STATIC_ASSERT((boost::is_same<U,type>::value));
BOOST_STATIC_ASSERT((boost::is_same<T,type>::value));
}
template< typename T >
void assignable_test(T x)
{
x = x;
}
template< bool R, typename T >
void is_reference_wrapper_test(T)
{
BOOST_STATIC_ASSERT(boost::is_reference_wrapper<T>::value == R);
}
template< typename R, typename Ref >
void cxx_reference_test(Ref)
{
#if BOOST_WORKAROUND(__BORLANDC__, < 0x600)
typedef typename boost::remove_const<Ref>::type ref;
BOOST_STATIC_ASSERT((boost::is_same<R,ref>::value));
#else
BOOST_STATIC_ASSERT((boost::is_same<R,Ref>::value));
#endif
}
template< typename R, typename Ref >
void unwrap_reference_test(Ref)
{
#if BOOST_WORKAROUND(__BORLANDC__, < 0x600)
typedef typename boost::remove_const<Ref>::type ref;
typedef typename boost::unwrap_reference<ref>::type type;
#else
typedef typename boost::unwrap_reference<Ref>::type type;
#endif
BOOST_STATIC_ASSERT((boost::is_same<R,type>::value));
}
} // namespace
int main()
{
int i = 0;
int& ri = i;
int const ci = 0;
int const& rci = ci;
// 'ref/cref' functions test
ref_test<int>(boost::ref(i));
ref_test<int>(boost::ref(ri));
ref_test<int const>(boost::ref(ci));
ref_test<int const>(boost::ref(rci));
ref_test<int const>(boost::cref(i));
ref_test<int const>(boost::cref(ri));
ref_test<int const>(boost::cref(ci));
ref_test<int const>(boost::cref(rci));
// test 'assignable' requirement
assignable_test(boost::ref(i));
assignable_test(boost::ref(ri));
assignable_test(boost::cref(i));
assignable_test(boost::cref(ci));
assignable_test(boost::cref(rci));
// 'is_reference_wrapper' test
is_reference_wrapper_test<true>(boost::ref(i));
is_reference_wrapper_test<true>(boost::ref(ri));
is_reference_wrapper_test<true>(boost::cref(i));
is_reference_wrapper_test<true>(boost::cref(ci));
is_reference_wrapper_test<true>(boost::cref(rci));
is_reference_wrapper_test<false>(i);
is_reference_wrapper_test<false, int&>(ri);
is_reference_wrapper_test<false>(ci);
is_reference_wrapper_test<false, int const&>(rci);
// ordinary references/function template arguments deduction test
cxx_reference_test<int>(i);
cxx_reference_test<int>(ri);
cxx_reference_test<int>(ci);
cxx_reference_test<int>(rci);
cxx_reference_test<int&, int&>(i);
cxx_reference_test<int&, int&>(ri);
cxx_reference_test<int const&, int const&>(i);
cxx_reference_test<int const&, int const&>(ri);
cxx_reference_test<int const&, int const&>(ci);
cxx_reference_test<int const&, int const&>(rci);
// 'unwrap_reference' test
unwrap_reference_test<int>(boost::ref(i));
unwrap_reference_test<int>(boost::ref(ri));
unwrap_reference_test<int const>(boost::cref(i));
unwrap_reference_test<int const>(boost::cref(ci));
unwrap_reference_test<int const>(boost::cref(rci));
unwrap_reference_test<int>(i);
unwrap_reference_test<int>(ri);
unwrap_reference_test<int>(ci);
unwrap_reference_test<int>(rci);
unwrap_reference_test<int&, int&>(i);
unwrap_reference_test<int&, int&>(ri);
unwrap_reference_test<int const&, int const&>(i);
unwrap_reference_test<int const&, int const&>(ri);
unwrap_reference_test<int const&, int const&>(ci);
unwrap_reference_test<int const&, int const&>(rci);
return 0;
}

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// Copyright David Abrahams and Aleksey Gurtovoy
// 2002-2004. Distributed under the Boost Software License, Version
// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
// run-time test for "boost/ref.hpp" header content
// see 'ref_ct_test.cpp' for compile-time part
#if defined(_MSC_VER) && !defined(__ICL)
# pragma warning(disable: 4786) // identifier truncated in debug info
# pragma warning(disable: 4710) // function not inlined
# pragma warning(disable: 4711) // function selected for automatic inline expansion
# pragma warning(disable: 4514) // unreferenced inline removed
#endif
#include <boost/ref.hpp>
#if defined(BOOST_MSVC) && (BOOST_MSVC < 1300)
# pragma warning(push, 3)
#endif
#include <iostream>
#if defined(BOOST_MSVC) && (BOOST_MSVC < 1300)
# pragma warning(pop)
#endif
#define BOOST_INCLUDE_MAIN
#include <boost/test/test_tools.hpp>
namespace {
using namespace boost;
template <class T>
struct ref_wrapper
{
// Used to verify implicit conversion
static T* get_pointer(T& x)
{
return &x;
}
static T const* get_const_pointer(T const& x)
{
return &x;
}
template <class Arg>
static T* passthru(Arg x)
{
return get_pointer(x);
}
template <class Arg>
static T const* cref_passthru(Arg x)
{
return get_const_pointer(x);
}
static void test(T x)
{
BOOST_CHECK(passthru(ref(x)) == &x);
BOOST_CHECK(&ref(x).get() == &x);
BOOST_CHECK(cref_passthru(cref(x)) == &x);
BOOST_CHECK(&cref(x).get() == &x);
}
};
} // namespace unnamed
int test_main(int, char * [])
{
ref_wrapper<int>::test(1);
ref_wrapper<int const>::test(1);
return 0;
}

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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
<meta name="GENERATOR" content="Microsoft FrontPage 4.0">
<meta name="ProgId" content="FrontPage.Editor.Document">
<title>Shared Container Iterator Documentation</title>
</head>
<body bgcolor="#FFFFFF" text="#000000">
<img src="../../boost.png" alt="boost.png (6897 bytes)"
align="center" width="277" height="86">
<h1>Shared Container Iterator</h1>
Defined in header
<a href="../../boost/shared_container_iterator.hpp">boost/shared_container_iterator.hpp</a>
<p>
The purpose of the shared container iterator is to attach the lifetime
of a container to the lifetime of its iterators. In other words, the
container will not be deleted until after all its iterators are
destroyed. The shared container iterator is typically used to
implement functions that return iterators over a range of objects that
only need to exist for the lifetime of the iterators. By returning a
pair of shared iterators from a function, the callee can return a
heap-allocated range of objects whose lifetime is automatically managed.
<p>
The shared container iterator augments an iterator over a shared
container. It maintains a reference count on the shared
container. If only shared container iterators hold references to
the container, the container's lifetime will end when the last shared
container iterator over it is destroyed. In any case, the shared
container is guaranteed to persist beyond the lifetime of all
the iterators. In all other ways, the
shared container iterator behaves the same as its base iterator.
<h2>Synopsis</h2>
<pre>
namespace boost {
template &lt;typename <a href="http://www.sgi.com/tech/stl/Container.html">Container</a>&gt;
class shared_container_iterator;
template &lt;typename <a href="http://www.sgi.com/tech/stl/Container.html">Container</a>&gt;
shared_container_iterator&lt;Container&gt;
make_shared_container_iterator(typename Container::iterator base,
boost::shared_ptr&lt;Container&gt; const&amp; container);
std::pair&lt;
typename shared_container_iterator&lt;Container&gt;,
typename shared_container_iterator&lt;Container&gt;
&gt;
make_shared_container_range(boost::shared_ptr&lt;Container&gt; const&amp; container);
}
</pre>
<hr>
<h2><a name="generator">The Shared Container Iterator Type</a></h2>
<pre>
template &lt;typename Container&gt; class shared_container_iterator;
</pre>
The class template <tt>shared_container_iterator</tt>
is the shared container iterator type. The <tt>Container</tt> template
type argument must model the
<a href="http://www.sgi.com/tech/stl/Container.html">Container</a>
concept.
<h3>Example</h3>
<p>
The following example illustrates how to create an iterator that
regulates the lifetime of a reference counted <tt>std::vector</tt>.
Though the original shared pointer <tt>ints</tt> ceases to exist
after <tt>set_range()</tt> returns, the
<tt>shared_counter_iterator</tt> objects maintain references to the
underlying vector and thereby extend the container's lifetime.
<p>
<a href="./shared_iterator_example1.cpp">shared_iterator_example1.cpp</a>:
<PRE>
<font color="#008040">#include "shared_container_iterator.hpp"</font>
<font color="#008040">#include "boost/shared_ptr.hpp"</font>
<font color="#008040">#include &lt;algorithm&gt;</font>
<font color="#008040">#include &lt;iostream&gt;</font>
<font color="#008040">#include &lt;vector&gt;</font>
<B>typedef</B> boost::shared_container_iterator&lt; std::vector&lt;<B>int</B>&gt; &gt; iterator;
<B>void</B> set_range(iterator& i, iterator& end) {
boost::shared_ptr&lt; std::vector&lt;<B>int</B>&gt; &gt; ints(<B>new</B> std::vector&lt;<B>int</B>&gt;());
ints-&gt;push_back(<font color="#0000A0">0</font>);
ints-&gt;push_back(<font color="#0000A0">1</font>);
ints-&gt;push_back(<font color="#0000A0">2</font>);
ints-&gt;push_back(<font color="#0000A0">3</font>);
ints-&gt;push_back(<font color="#0000A0">4</font>);
ints-&gt;push_back(<font color="#0000A0">5</font>);
i = iterator(ints-&gt;begin(),ints);
end = iterator(ints-&gt;end(),ints);
}
<B>int</B> main() {
iterator i,end;
set_range(i,end);
std::copy(i,end,std::ostream_iterator&lt;<B>int</B>&gt;(std::cout,<font color="#0000FF">","</font>));
std::cout.put(<font color="#0000FF">'\n'</font>);
<B>return</B> <font color="#0000A0">0</font>;
}
</PRE>
The output from this part is:
<pre>
0,1,2,3,4,5,
</pre>
<h3>Template Parameters</h3>
<Table border>
<TR>
<TH>Parameter</TH><TH>Description</TH>
</TR>
<TR>
<TD><a
href="http://www.sgi.com/tech/stl/Container.html"><tt>Container</tt></a></TD>
<TD>The type of the container that we wish to iterate over. It must be
a model of the
<a href="http://www.sgi.com/tech/stl/Container.html"><tt>Container</tt></a>
concept.
</TD>
</TR>
</Table>
<h3>Model of</h3>
The <tt>shared_container_iterator<Container></tt> type models the
same iterator concept as the base iterator
(<tt>Container::iterator</tt>).
<h3>Members</h3>
The shared container iterator type implements the member functions and
operators required of the <a
href="http://www.sgi.com/tech/stl/RandomAccessIterator.html">Random Access Iterator</a>
concept, though only operations defined for the base iterator will be valid.
In addition it has the following constructor:
<pre>
shared_container_iterator(Container::iterator const&amp; it,
boost::shared_ptr&lt;Container&gt; const&amp; container)
</pre>
<p>
<hr>
<p>
<h2><a name="make_iterator">The Shared Container Iterator Object Generator</a></h2>
<pre>
template &lt;typename Container&gt;
shared_container_iterator&lt;Container&gt;
make_shared_container_iterator(Container::iterator base,
boost::shared_ptr&lt;Container&gt; const&amp; container)
</pre>
This function provides an alternative to directly constructing a
shared container iterator. Using the object generator, a shared
container iterator can be created and passed to a function without
explicitly specifying its type.
<h3>Example</h3>
This example, similar to the previous, uses
<tt>make_shared_container_iterator()</tt> to create the iterators.
<p>
<a href="./shared_iterator_example2.cpp">shared_iterator_example2.cpp</a>:
<PRE>
<font color="#008040">#include "shared_container_iterator.hpp"</font>
<font color="#008040">#include "boost/shared_ptr.hpp"</font>
<font color="#008040">#include &lt;algorithm&gt;</font>
<font color="#008040">#include &lt;iterator&gt;</font>
<font color="#008040">#include &lt;iostream&gt;</font>
<font color="#008040">#include &lt;vector&gt;</font>
<B>template</B> &lt;<B>typename</B> Iterator&gt;
<B>void</B> print_range_nl (Iterator begin, Iterator end) {
<B>typedef</B> <B>typename</B> std::iterator_traits&lt;Iterator&gt;::value_type val;
std::copy(begin,end,std::ostream_iterator&lt;val&gt;(std::cout,<font color="#0000FF">","</font>));
std::cout.put(<font color="#0000FF">'\n'</font>);
}
<B>int</B> main() {
<B>typedef</B> boost::shared_ptr&lt; std::vector&lt;<B>int</B>&gt; &gt; ints_t;
{
ints_t ints(<B>new</B> std::vector&lt;<B>int</B>&gt;());
ints-&gt;push_back(<font color="#0000A0">0</font>);
ints-&gt;push_back(<font color="#0000A0">1</font>);
ints-&gt;push_back(<font color="#0000A0">2</font>);
ints-&gt;push_back(<font color="#0000A0">3</font>);
ints-&gt;push_back(<font color="#0000A0">4</font>);
ints-&gt;push_back(<font color="#0000A0">5</font>);
print_range_nl(boost::make_shared_container_iterator(ints-&gt;begin(),ints),
boost::make_shared_container_iterator(ints-&gt;end(),ints));
}
<B>return</B> <font color="#0000A0">0</font>;
}
</PRE>
Observe that the <tt>shared_container_iterator</tt> type is never
explicitly named. The output from this example is the same as the previous.
<h2><a name="make_range">The Shared Container Iterator Range Generator</a></h2>
<pre>
template &lt;typename Container&gt;
std::pair&lt
shared_container_iterator&lt;Container&gt;,
shared_container_iterator&lt;Container&gt;
&gt;
make_shared_container_range(boost::shared_ptr&lt;Container&gt; const&amp; container);
</pre>
Class <tt>shared_container_iterator</tt> is meant primarily to return,
using iterators, a range of values that we can guarantee will be alive as
long as the iterators are. This is a convenience
function to do just that. It is equivalent to
<pre>
std::make_pair(make_shared_container_iterator(container-&gt;begin(),container),
make_shared_container_iterator(container-&gt;end(),container));
</pre>
<h3>Example</h3>
In the following example, a range of values is returned as a pair of
<tt>shared_container_iterator</tt> objects.
<p>
<a href="./shared_iterator_example3.cpp">shared_iterator_example3.cpp</a>:
<PRE>
<font color="#008040">#include "shared_container_iterator.hpp"</font>
<font color="#008040">#include "boost/shared_ptr.hpp"</font>
<font color="#008040">#include "boost/tuple/tuple.hpp" // for boost::tie</font>
<font color="#008040">#include &lt;algorithm&gt; // for std::copy</font>
<font color="#008040">#include &lt;iostream&gt; </font>
<font color="#008040">#include &lt;vector&gt;</font>
<B>typedef</B> boost::shared_container_iterator&lt; std::vector&lt;<B>int</B>&gt; &gt; iterator;
std::pair&lt;iterator,iterator&gt;
return_range() {
boost::shared_ptr&lt; std::vector&lt;<B>int</B>&gt; &gt; range(<B>new</B> std::vector&lt;<B>int</B>&gt;());
range-&gt;push_back(<font color="#0000A0">0</font>);
range-&gt;push_back(<font color="#0000A0">1</font>);
range-&gt;push_back(<font color="#0000A0">2</font>);
range-&gt;push_back(<font color="#0000A0">3</font>);
range-&gt;push_back(<font color="#0000A0">4</font>);
range-&gt;push_back(<font color="#0000A0">5</font>);
<B>return</B> boost::make_shared_container_range(range);
}
<B>int</B> main() {
iterator i,end;
boost::tie(i,end) = return_range();
std::copy(i,end,std::ostream_iterator&lt;<B>int</B>&gt;(std::cout,<font color="#0000FF">","</font>));
std::cout.put(<font color="#0000FF">'\n'</font>);
<B>return</B> <font color="#0000A0">0</font>;
}
</PRE>
Though the <tt>range</tt> object only lives for the duration of the
<tt>return_range</tt> call, the reference counted
<tt>std::vector</tt> will live until <tt>i</tt> and <tt>end</tt>
are both destroyed. The output from this example is the same as
the previous two.
<hr>
<!-- hhmts start -->
Last modified: Mon Aug 11 11:27:03 EST 2003
<!-- hhmts end -->
<p><EFBFBD> Copyright 2003 The Trustees of Indiana University.
Use, modification and distribution is subject to the Boost Software
License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
http://www.boost.org/LICENSE_1_0.txt)</p>
</body>
</html>

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// Copyright 2003 The Trustees of Indiana University.
// Use, modification and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#include "boost/shared_container_iterator.hpp"
#include "boost/shared_ptr.hpp"
#include <algorithm>
#include <iostream>
#include <vector>
typedef boost::shared_container_iterator< std::vector<int> > iterator;
void set_range(iterator& i, iterator& end) {
boost::shared_ptr< std::vector<int> > ints(new std::vector<int>());
ints->push_back(0);
ints->push_back(1);
ints->push_back(2);
ints->push_back(3);
ints->push_back(4);
ints->push_back(5);
i = iterator(ints->begin(),ints);
end = iterator(ints->end(),ints);
}
int main() {
iterator i,end;
set_range(i,end);
std::copy(i,end,std::ostream_iterator<int>(std::cout,","));
std::cout.put('\n');
return 0;
}

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// Copyright 2003 The Trustees of Indiana University.
// Use, modification and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#include "boost/shared_container_iterator.hpp"
#include "boost/shared_ptr.hpp"
#include <algorithm>
#include <iterator>
#include <iostream>
#include <vector>
template <typename Iterator>
void print_range_nl (Iterator begin, Iterator end) {
typedef typename std::iterator_traits<Iterator>::value_type val;
std::copy(begin,end,std::ostream_iterator<val>(std::cout,","));
std::cout.put('\n');
}
int main() {
typedef boost::shared_ptr< std::vector<int> > ints_t;
{
ints_t ints(new std::vector<int>());
ints->push_back(0);
ints->push_back(1);
ints->push_back(2);
ints->push_back(3);
ints->push_back(4);
ints->push_back(5);
print_range_nl(boost::make_shared_container_iterator(ints->begin(),ints),
boost::make_shared_container_iterator(ints->end(),ints));
}
return 0;
}

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// Copyright 2003 The Trustees of Indiana University.
// Use, modification and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#include "boost/shared_container_iterator.hpp"
#include "boost/shared_ptr.hpp"
#include "boost/tuple/tuple.hpp" // for boost::tie
#include <algorithm> // for std::copy
#include <iostream>
#include <vector>
typedef boost::shared_container_iterator< std::vector<int> > iterator;
std::pair<iterator,iterator>
return_range() {
boost::shared_ptr< std::vector<int> > range(new std::vector<int>());
range->push_back(0);
range->push_back(1);
range->push_back(2);
range->push_back(3);
range->push_back(4);
range->push_back(5);
return boost::make_shared_container_range(range);
}
int main() {
iterator i,end;
boost::tie(i,end) = return_range();
std::copy(i,end,std::ostream_iterator<int>(std::cout,","));
std::cout.put('\n');
return 0;
}

64
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// Copyright 2003 The Trustees of Indiana University.
// Use, modification and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
// Shared container iterator adaptor
// Author: Ronald Garcia
// See http://boost.org/libs/utility/shared_container_iterator.html
// for documentation.
//
// shared_iterator_test.cpp - Regression tests for shared_container_iterator.
//
#include "boost/shared_container_iterator.hpp"
#include "boost/shared_ptr.hpp"
#include <vector>
#include <cassert>
struct resource {
static int count;
resource() { ++count; }
resource(resource const&) { ++count; }
~resource() { --count; }
};
int resource::count = 0;
typedef std::vector<resource> resources_t;
typedef boost::shared_container_iterator< resources_t > iterator;
void set_range(iterator& i, iterator& end) {
boost::shared_ptr< resources_t > objs(new resources_t());
for (int j = 0; j != 6; ++j)
objs->push_back(resource());
i = iterator(objs->begin(),objs);
end = iterator(objs->end(),objs);
assert(resource::count == 6);
}
int main() {
assert(resource::count == 0);
{
iterator i;
{
iterator end;
set_range(i,end);
assert(resource::count == 6);
}
assert(resource::count == 6);
}
assert(resource::count == 0);
return 0;
}

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The existance of this file tells the regression reporting programs that the directory contains sub-directories which are libraries.

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# Copyright David Abrahams 2003.
# Distributed under the Boost Software License, Version 1.0.
# See http://www.boost.org/LICENSE_1_0.txt
# For more information, see http://www.boost.org/
# bring in rules for testing
import testing ;
# Please keep the tests ordered by filename
test-suite utility
:
[ run ../addressof_test.cpp ]
[ run ../assert_test.cpp ]
[ run ../base_from_member_test.cpp ]
[ run ../binary_search_test.cpp ]
[ run ../call_traits_test.cpp : -u ]
[ compile-fail ../checked_delete_test.cpp ]
[ run ../compressed_pair_test.cpp ../../test/build//boost_test_exec_monitor/<link>static : -u ]
[ run ../current_function_test.cpp : : : <test-info>always_show_run_output ]
[ run ../iterators_test.cpp ../../test/build//boost_test_exec_monitor/<link>static ]
[ run next_prior_test.cpp ../../test/build//boost_test_exec_monitor/<link>static ]
[ compile-fail ../noncopyable_test.cpp ]
[ run ../numeric_traits_test.cpp ]
[ run ../operators_test.cpp ../../test/build//boost_test_exec_monitor/<link>static ]
[ compile ../ref_ct_test.cpp ]
[ run ../ref_test.cpp ../../test/build//boost_test_exec_monitor/<link>static ]
[ compile result_of_test.cpp ]
[ run ../shared_iterator_test.cpp ]
[ run ../value_init_test.cpp ]
[ compile-fail ../value_init_test_fail1.cpp ]
[ compile-fail ../value_init_test_fail2.cpp ]
[ compile-fail ../value_init_test_fail3.cpp ]
[ run ../verify_test.cpp ]
;

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// Boost test program for next() and prior() utilities.
// Copyright 2003 Daniel Walker. Use, modification, and distribution
// are subject to the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or a copy at
// http://www.boost.org/LICENSE_1_0.txt.)
// See http://www.boost.org/libs/utility for documentation.
// Revision History 13 Dec 2003 Initial Version (Daniel Walker)
// next() and prior() are replacements for operator+ and operator- for
// non-random-access iterators. The semantics of these operators are
// such that after executing j = i + n, std::distance(i, j) equals
// n. Tests are provided to ensure next() has the same
// result. Parallel tests are provided for prior(). The tests call
// next() and prior() several times. next() and prior() are very
// simple functions, though, and it would be very strange if these
// tests were to fail.
#define BOOST_INCLUDE_MAIN
#include <boost/test/test_tools.hpp>
#include <list>
#include <vector>
#include <boost/next_prior.hpp>
template<class RandomAccessIterator, class ForwardIterator>
bool plus_one_test(RandomAccessIterator first, RandomAccessIterator last, ForwardIterator first2)
{
RandomAccessIterator i = first;
ForwardIterator j = first2;
while(i != last)
i = i + 1, j = boost::next(j);
return std::distance(first, i) == std::distance(first2, j);
}
template<class RandomAccessIterator, class ForwardIterator>
bool plus_n_test(RandomAccessIterator first, RandomAccessIterator last, ForwardIterator first2)
{
RandomAccessIterator i = first;
ForwardIterator j = first2;
for(int n = 0; i != last; ++n)
i = first + n, j = boost::next(first2, n);
return std::distance(first, i) == std::distance(first2, j);
}
template<class RandomAccessIterator, class BidirectionalIterator>
bool minus_one_test(RandomAccessIterator first, RandomAccessIterator last, BidirectionalIterator last2)
{
RandomAccessIterator i = last;
BidirectionalIterator j = last2;
while(i != first)
i = i - 1, j = boost::prior(j);
return std::distance(i, last) == std::distance(j, last2);
}
template<class RandomAccessIterator, class BidirectionalIterator>
bool minus_n_test(RandomAccessIterator first, RandomAccessIterator last, BidirectionalIterator last2)
{
RandomAccessIterator i = last;
BidirectionalIterator j = last2;
for(int n = 0; i != first; ++n)
i = last - n, j = boost::prior(last2, n);
return std::distance(i, last) == std::distance(j, last2);
}
int test_main(int, char*[])
{
std::vector<int> x(8);
std::list<int> y(x.begin(), x.end());
BOOST_REQUIRE(plus_one_test(x.begin(), x.end(), y.begin()));
BOOST_REQUIRE(plus_n_test(x.begin(), x.end(), y.begin()));
BOOST_REQUIRE(minus_one_test(x.begin(), x.end(), y.end()));
BOOST_REQUIRE(minus_n_test(x.begin(), x.end(), y.end()));
return 0;
}

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// Boost result_of library
// Copyright Douglas Gregor 2003-2004. Use, modification and
// distribution is subject to the Boost Software License, Version
// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
// For more information, see http://www.boost.org/libs/utility
#include <boost/utility/result_of.hpp>
#include <utility>
#include <boost/static_assert.hpp>
#include <boost/type_traits/is_same.hpp>
struct int_result_type
{
typedef int result_type;
result_type operator()(float);
};
struct int_result_of
{
template<typename F> struct result { typedef int type; };
result<int_result_of(double)>::type operator()(double);
result<const int_result_of(double)>::type operator()(double) const;
result<int_result_of()>::type operator()();
result<volatile int_result_of()>::type operator()() volatile;
};
struct int_result_type_and_float_result_of_and_char_return
{
typedef int result_type;
template<typename F> struct result { typedef float type; };
char operator()(char);
};
template<typename T>
struct int_result_type_template
{
typedef int result_type;
result_type operator()(float);
};
template<typename T>
struct int_result_of_template
{
template<typename F> struct result;
template<typename This, typename That> struct result<This(That)> { typedef int type; };
typename result<int_result_of_template<T>(double)>::type operator()(double);
typename result<const int_result_of_template<T>(double)>::type operator()(double) const;
typename result<int_result_of_template<T>(double)>::type operator()();
typename result<volatile int_result_of_template<T>(double)>::type operator()() volatile;
};
template<typename T>
struct int_result_type_and_float_result_of_and_char_return_template
{
typedef int result_type;
template<typename F> struct result;
template<typename This, typename That> struct result<This(That)> { typedef float type; };
char operator()(char);
};
struct result_of_member_function_template
{
template<typename F> struct result;
template<typename This, typename That> struct result<This(That)> { typedef That type; };
template<class T> typename result<result_of_member_function_template(T)>::type operator()(T);
template<typename This, typename That> struct result<const This(That)> { typedef const That type; };
template<class T> typename result<const result_of_member_function_template(T)>::type operator()(T) const;
template<typename This, typename That> struct result<volatile This(That)> { typedef volatile That type; };
template<class T> typename result<volatile result_of_member_function_template(T)>::type operator()(T) volatile;
template<typename This, typename That> struct result<const volatile This(That)> { typedef const volatile That type; };
template<class T> typename result<const volatile result_of_member_function_template(T)>::type operator()(T) const volatile;
template<typename This, typename That> struct result<This(That &, That)> { typedef That & type; };
template<class T> typename result<result_of_member_function_template(T &, T)>::type operator()(T &, T);
template<typename This, typename That> struct result<This(That const &, That)> { typedef That const & type; };
template<class T> typename result<result_of_member_function_template(T const &, T)>::type operator()(T const &, T);
template<typename This, typename That> struct result<This(That volatile &, That)> { typedef That volatile & type; };
template<class T> typename result<result_of_member_function_template(T volatile &, T)>::type operator()(T volatile &, T);
template<typename This, typename That> struct result<This(That const volatile &, That)> { typedef That const volatile & type; };
template<class T> typename result<result_of_member_function_template(T const volatile &, T)>::type operator()(T const volatile &, T);
};
struct no_result_type_or_result_of
{
int operator()(double);
short operator()(double) const;
unsigned int operator()();
unsigned short operator()() volatile;
const unsigned short operator()() const volatile;
};
template<typename T>
struct no_result_type_or_result_of_template
{
int operator()(double);
short operator()(double) const;
unsigned int operator()();
unsigned short operator()() volatile;
const unsigned short operator()() const volatile;
};
struct X {};
int main()
{
using namespace boost;
typedef int (*func_ptr)(float, double);
typedef int (&func_ref)(float, double);
typedef int (*func_ptr_0)();
typedef int (&func_ref_0)();
typedef int (X::*mem_func_ptr)(float);
typedef int (X::*mem_func_ptr_c)(float) const;
typedef int (X::*mem_func_ptr_v)(float) volatile;
typedef int (X::*mem_func_ptr_cv)(float) const volatile;
typedef int (X::*mem_func_ptr_0)();
BOOST_STATIC_ASSERT((is_same<result_of<int_result_type(float)>::type, int>::value));
BOOST_STATIC_ASSERT((is_same<result_of<int_result_of(double)>::type, int>::value));
BOOST_STATIC_ASSERT((is_same<result_of<const int_result_of(double)>::type, int>::value));
BOOST_STATIC_ASSERT((is_same<result_of<int_result_type_template<void>(float)>::type, int>::value));
BOOST_STATIC_ASSERT((is_same<result_of<int_result_of_template<void>(double)>::type, int>::value));
BOOST_STATIC_ASSERT((is_same<result_of<const int_result_of_template<void>(double)>::type, int>::value));
// Prior to decltype, result_of could not deduce the return type
// nullary function objects unless they exposed a result_type.
#if defined(BOOST_HAS_DECLTYPE)
BOOST_STATIC_ASSERT((is_same<result_of<int_result_of(void)>::type, int>::value));
BOOST_STATIC_ASSERT((is_same<result_of<volatile int_result_of(void)>::type, int>::value));
BOOST_STATIC_ASSERT((is_same<result_of<int_result_of_template<void>(void)>::type, int>::value));
BOOST_STATIC_ASSERT((is_same<result_of<volatile int_result_of_template<void>(void)>::type, int>::value));
#else
BOOST_STATIC_ASSERT((is_same<result_of<int_result_of(void)>::type, void>::value));
BOOST_STATIC_ASSERT((is_same<result_of<volatile int_result_of(void)>::type, void>::value));
BOOST_STATIC_ASSERT((is_same<result_of<int_result_of_template<void>(void)>::type, void>::value));
BOOST_STATIC_ASSERT((is_same<result_of<volatile int_result_of_template<void>(void)>::type, void>::value));
#endif
// Prior to decltype, result_of ignored a nested result<> if
// result_type was defined. After decltype, result_of deduces the
// actual return type of the function object, ignoring both
// result<> and result_type.
#if defined(BOOST_HAS_DECLTYPE)
BOOST_STATIC_ASSERT((is_same<result_of<int_result_type_and_float_result_of_and_char_return(char)>::type, char>::value));
BOOST_STATIC_ASSERT((is_same<result_of<int_result_type_and_float_result_of_and_char_return_template<void>(char)>::type, char>::value));
#else
BOOST_STATIC_ASSERT((is_same<result_of<int_result_type_and_float_result_of_and_char_return(char)>::type, int>::value));
BOOST_STATIC_ASSERT((is_same<result_of<int_result_type_and_float_result_of_and_char_return_template<void>(char)>::type, int>::value));
#endif
BOOST_STATIC_ASSERT((is_same<result_of<func_ptr(char, float)>::type, int>::value));
BOOST_STATIC_ASSERT((is_same<result_of<func_ref(char, float)>::type, int>::value));
BOOST_STATIC_ASSERT((is_same<result_of<func_ptr_0()>::type, int>::value));
BOOST_STATIC_ASSERT((is_same<result_of<func_ref_0()>::type, int>::value));
BOOST_STATIC_ASSERT((is_same<result_of<mem_func_ptr(X,char)>::type, int>::value));
BOOST_STATIC_ASSERT((is_same<result_of<mem_func_ptr_c(X,char)>::type, int>::value));
BOOST_STATIC_ASSERT((is_same<result_of<mem_func_ptr_v(X,char)>::type, int>::value));
BOOST_STATIC_ASSERT((is_same<result_of<mem_func_ptr_cv(X,char)>::type, int>::value));
BOOST_STATIC_ASSERT((is_same<result_of<mem_func_ptr_0(X)>::type, int>::value));
BOOST_STATIC_ASSERT((is_same<result_of<func_ptr(void)>::type, int>::value));
BOOST_STATIC_ASSERT((is_same<result_of<result_of_member_function_template(double)>::type, double>::value));
BOOST_STATIC_ASSERT((is_same<result_of<const result_of_member_function_template(double)>::type, const double>::value));
BOOST_STATIC_ASSERT((is_same<result_of<volatile result_of_member_function_template(double)>::type, volatile double>::value));
BOOST_STATIC_ASSERT((is_same<result_of<const volatile result_of_member_function_template(double)>::type, const volatile double>::value));
BOOST_STATIC_ASSERT((is_same<result_of<result_of_member_function_template(int &, int)>::type, int &>::value));
BOOST_STATIC_ASSERT((is_same<result_of<result_of_member_function_template(int const &, int)>::type, int const &>::value));
BOOST_STATIC_ASSERT((is_same<result_of<result_of_member_function_template(int volatile &, int)>::type, int volatile &>::value));
BOOST_STATIC_ASSERT((is_same<result_of<result_of_member_function_template(int const volatile &, int)>::type, int const volatile &>::value));
#if defined(BOOST_HAS_DECLTYPE)
BOOST_STATIC_ASSERT((is_same<result_of<no_result_type_or_result_of(double)>::type, int>::value));
BOOST_STATIC_ASSERT((is_same<result_of<no_result_type_or_result_of(void)>::type, unsigned int>::value));
BOOST_STATIC_ASSERT((is_same<result_of<const no_result_type_or_result_of(double)>::type, short>::value));
BOOST_STATIC_ASSERT((is_same<result_of<volatile no_result_type_or_result_of(void)>::type, unsigned short>::value));
BOOST_STATIC_ASSERT((is_same<result_of<const volatile no_result_type_or_result_of(void)>::type, const unsigned short>::value));
BOOST_STATIC_ASSERT((is_same<result_of<no_result_type_or_result_of_template<void>(double)>::type, int>::value));
BOOST_STATIC_ASSERT((is_same<result_of<no_result_type_or_result_of_template<void>(void)>::type, unsigned int>::value));
BOOST_STATIC_ASSERT((is_same<result_of<const no_result_type_or_result_of_template<void>(double)>::type, short>::value));
BOOST_STATIC_ASSERT((is_same<result_of<volatile no_result_type_or_result_of_template<void>(void)>::type, unsigned short>::value));
BOOST_STATIC_ASSERT((is_same<result_of<const volatile no_result_type_or_result_of_template<void>(void)>::type, const unsigned short>::value));
#endif
return 0;
}

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title>Boost: throw_exception.hpp documentation</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>
<body bgcolor="white" style="MARGIN-LEFT: 5%; MARGIN-RIGHT: 5%">
<table border="0" width="100%">
<tr>
<td width="277"><A href="../../index.htm"> <img src="../../boost.png" alt="boost.png (6897 bytes)" width="277" height="86" border="0"></A>
</td>
<td align="center">
<h1>throw_exception.hpp</h1>
</td>
</tr>
<tr>
<td colspan="2" height="64">&nbsp;</td>
</tr>
</table>
<p>
The header <STRONG>&lt;boost/throw_exception.hpp&gt;</STRONG> defines the
helper function <STRONG>boost::throw_exception</STRONG>. It is intended to be
used in Boost libraries that need to throw exceptions, but support
configurations and platforms where exceptions aren't available, as indicated by
the presence of the <STRONG>BOOST_NO_EXCEPTIONS</STRONG> <A href="../config/config.htm#macro_ref">
configuration macro</A>.
</p>
<P>When <STRONG>BOOST_NO_EXCEPTIONS</STRONG> is not defined, <tt>boost::throw_exception(e)</tt>
is equivalent to <tt>throw e</tt>. Otherwise, the function is left undefined,
and the user is expected to supply an appropriate definition. Callers of <tt>throw_exception</tt>
are allowed to assume that the function never returns; therefore, if the
user-defined <tt>throw_exception</tt> returns, the behavior is undefined.</P>
<h3><a name="Synopsis">Synopsis</a></h3>
<pre>
namespace boost
{
#ifdef BOOST_NO_EXCEPTIONS
void throw_exception(std::exception const &amp; e); // user defined
#else
template&lt;class E&gt; void throw_exception(E const &amp; e)
{
throw e;
}
#endif
}
</pre>
<p><br>
<small>Copyright <20> 2002 by Peter Dimov. Distributed under the Boost Software License, Version
1.0. See accompanying file <A href="../../LICENSE_1_0.txt">LICENSE_1_0.txt</A> or
copy at <A href="http://www.boost.org/LICENSE_1_0.txt">http://www.boost.org/LICENSE_1_0.txt</A>.</small></p>
</body>
</html>

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<HTML>
<!--
-- Copyright (c) Jeremy Siek, Lie-Quan Lee, and Andrew Lumsdaine 2000
--
-- Permission to use, copy, modify, distribute and sell this software
-- and its documentation for any purpose is hereby granted without fee,
-- provided that the above copyright notice appears in all copies and
-- that both that copyright notice and this permission notice appear
-- in supporting documentation. We make no
-- representations about the suitability of this software for any
-- purpose. It is provided "as is" without express or implied warranty.
-->
<Head>
<Title>Boost Tie</Title>
<BODY BGCOLOR="#ffffff" LINK="#0000ee" TEXT="#000000" VLINK="#551a8b"
ALINK="#ff0000">
<IMG SRC="../../c++boost.gif"
ALT="C++ Boost" width="277" height="86">
<BR Clear>
<H1><A NAME="sec:tie"></A>
<TT>tie</TT>
</H1>
<P>
<PRE>
template &lt;class A, class B&gt;
tied&lt;A,B&gt; tie(A&amp; a, B&amp; b);
</PRE>
<P>
This is a utility function that makes it more convenient to work with
a function which returns a std::pair&lt;&gt;. The effect of the <TT>tie()</TT>
function is to allow the assignment of the two values of the pair to
two separate variables. The idea for this comes from Jaakko
J&#228;rvi's Binders&nbsp;[<A
HREF="../graph/docs/bibliography.html#jaakko_tuple_assign">1</A>].
<P>
<H3>Where Defined</H3>
<P>
<a href="../../boost/utility.hpp"><TT>boost/utility.hpp</TT></a>
<P>
<H3>Example</H3>
<P>
An example of using the <TT>tie()</TT> function with the
<TT>vertices()</TT> function, which returns a pair of
type <TT>std::pair&lt;vertex_iterator,vertex_iterator&gt;</TT>. The
pair of iterators is assigned to the iterator variables <TT>i</TT> and
<TT>end</TT>.
<P>
<PRE>
graph_traits&lt; adjacency_list&lt;&gt; &gt;::vertex_iterator i, end;
for(tie(i,end) = vertices(G); i != end; ++i)
// ...
</PRE>
<P>
Here is another example that uses <TT>tie()</TT> for handling operations with <a
href="http://www.sgi.com/Technology/STL/set.html"><TT>std::set</TT></a>.
<P>
<PRE>
#include &lt;set&gt;
#include &lt;algorithm&gt;
#include &lt;iostream&gt;
#include &lt;boost/utility.hpp&gt;
int
main(int, char*[])
{
{
typedef std::set&lt;int&gt; SetT;
SetT::iterator i, end;
bool inserted;
int vals[5] = { 5, 2, 4, 9, 1 };
SetT s(vals, vals + 5);
// Using tie() with a return value of pair&lt;iterator,bool&gt;
int new_vals[2] = { 3, 9 };
for (int k = 0; k &lt; 2; ++k) {
boost::tie(i,inserted) = s.insert(new_vals[k]);
if (!inserted)
std::cout &lt;&lt; *i &lt;&lt; &quot; was already in the set.&quot; &lt;&lt; std::endl;
else
std::cout &lt;&lt; *i &lt;&lt; &quot; successfully inserted.&quot; &lt;&lt; std::endl;
}
}
{
int* i, *end;
int vals[6] = { 5, 2, 4, 4, 9, 1 };
std::sort(vals, vals + 6);
// Using tie() with a return value of pair&lt;iterator,iterator&gt;
boost::tie(i,end) = std::equal_range(vals, vals + 6, 4);
std::cout &lt;&lt; &quot;There were &quot; &lt;&lt; std::distance(i,end)
&lt;&lt; &quot; occurrences of &quot; &lt;&lt; *i &lt;&lt; &quot;.&quot; &lt;&lt; std::endl;
// Footnote: of course one would normally just use std::count()
// to get this information, but that would spoil the example :)
}
return 0;
}
</PRE>
The output is:
<PRE>
3 successfully inserted.
9 was already in the set.
There were 2 occurrences of 4.
</PRE>
<br>
<HR>
<TABLE>
<TR valign=top>
<TD nowrap>Copyright &copy 2000</TD><TD>
<A HREF=http://www.boost.org/people/jeremy_siek.htm>Jeremy Siek</A>,
Univ.of Notre Dame (<A
HREF="mailto:jsiek@lsc.nd.edu">jsiek@lsc.nd.edu</A>)<br>
<A HREF=http://www.lsc.nd.edu/~llee1>Lie-Quan Lee</A>, Univ.of Notre Dame (<A HREF="mailto:llee1@lsc.nd.edu">llee1@lsc.nd.edu</A>)<br>
<A HREF=http://www.lsc.nd.edu/~lums>Andrew Lumsdaine</A>,
Univ.of Notre Dame (<A
HREF="mailto:lums@lsc.nd.edu">lums@lsc.nd.edu</A>)
</TD></TR></TABLE>
</BODY>
</HTML>

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@ -1,61 +0,0 @@
// (C) Copyright Jeremy Siek 2000. Permission to copy, use, modify,
// sell and distribute this software is granted provided this
// copyright notice appears in all copies. This software is provided
// "as is" without express or implied warranty, and with no claim as
// to its suitability for any purpose.
//
// This is an example demonstrating how to use the tie() function.
// The purpose of tie() is to make it easiery to deal with std::pair
// return values.
//
// Contributed by Jeremy Siek
//
// Sample output
//
// 3 successfully inserted.
// 9 was already in the set.
// There were 2 occurances of 4.
#include <set>
#include <algorithm>
#include <iostream>
#include <boost/utility.hpp>
int
main(int, char*[])
{
{
typedef std::set<int> SetT;
SetT::iterator i, end;
bool inserted;
int vals[5] = { 5, 2, 4, 9, 1 };
SetT s(vals, vals + 5);
// Using tie() with a return value of pair<iterator,bool>
int new_vals[2] = { 3, 9 };
for (int k = 0; k < 2; ++k) {
boost::tie(i,inserted) = s.insert(new_vals[k]);
if (!inserted)
std::cout << *i << " was already in the set." << std::endl;
else
std::cout << *i << " successfully inserted." << std::endl;
}
}
{
int* i, *end;
int vals[6] = { 5, 2, 4, 4, 9, 1 };
std::sort(vals, vals + 6);
// Using tie() with a return value of pair<iterator,iterator>
boost::tie(i,end) = std::equal_range(vals, vals + 6, 4);
std::cout << "There were " << std::distance(i,end)
<< " occurances of " << *i << "." << std::endl;
// Footnote: of course one would normally just use std::count()
// to get this information, but that would spoil the example :)
}
return 0;
}

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content="C:\PROGRAM FILES\MICROSOFT OFFICE\OFFICE\html.dot">
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<title>Type Traits</title>
</head>
<body bgcolor="#FFFFFF" link="#0000FF" vlink="#800080">
<h1><img src="../../c++boost.gif" width="276" height="86">Header
&lt;<a href="../../boost/detail/type_traits.hpp">boost/type_traits.hpp</a>&gt;</h1>
<p>The contents of &lt;boost/type_traits.hpp&gt; are declared in
namespace boost.</p>
<p>The file &lt;<a href="../../boost/detail/type_traits.hpp">boost/type_traits.hpp</a>&gt;
contains various template classes that describe the fundamental
properties of a type; each class represents a single type
property or a single type transformation. This documentation is
divided up into the following sections:</p>
<pre><a href="#fop">Fundamental type operations</a>
<a href="#fp">Fundamental type properties</a>
<a href="#misc">Miscellaneous</a>
<code> </code><a href="#cv">cv-Qualifiers</a>
<code> </code><a href="#ft">Fundamental Types</a>
<code> </code><a href="#ct">Compound Types</a>
<code> </code><a href="#ot">Object/Scalar Types</a>
<a href="#cs">Compiler Support Information</a>
<a href="#ec">Example Code</a></pre>
<h2><a name="fop"></a>Fundamental type operations</h2>
<p>Usage: &quot;class_name&lt;T&gt;::type&quot; performs
indicated transformation on type T.</p>
<table border="1" cellpadding="7" cellspacing="1" width="100%">
<tr>
<td valign="top" width="45%"><p align="center">Expression.</p>
</td>
<td valign="top" width="45%"><p align="center">Description.</p>
</td>
<td valign="top" width="33%"><p align="center">Compiler.</p>
</td>
</tr>
<tr>
<td valign="top" width="45%"><code>remove_volatile&lt;T&gt;::type</code></td>
<td valign="top" width="45%">Creates a type the same as T
but with any top level volatile qualifier removed. For
example &quot;volatile int&quot; would become &quot;int&quot;.</td>
<td valign="top" width="33%"><p align="center">P</p>
</td>
</tr>
<tr>
<td valign="top" width="45%"><code>remove_const&lt;T&gt;::type</code></td>
<td valign="top" width="45%">Creates a type the same as T
but with any top level const qualifier removed. For
example &quot;const int&quot; would become &quot;int&quot;.</td>
<td valign="top" width="33%"><p align="center">P</p>
</td>
</tr>
<tr>
<td valign="top" width="45%"><code>remove_cv&lt;T&gt;::type</code></td>
<td valign="top" width="45%">Creates a type the same as T
but with any top level cv-qualifiers removed. For example
&quot;const int&quot; would become &quot;int&quot;, and
&quot;volatile double&quot; would become &quot;double&quot;.</td>
<td valign="top" width="33%"><p align="center">P</p>
</td>
</tr>
<tr>
<td valign="top" width="45%"><code>remove_reference&lt;T&gt;::type</code></td>
<td valign="top" width="45%">If T is a reference type
then removes the reference, otherwise leaves T unchanged.
For example &quot;int&amp;&quot; becomes &quot;int&quot;
but &quot;int*&quot; remains unchanged.</td>
<td valign="top" width="33%"><p align="center">P</p>
</td>
</tr>
<tr>
<td valign="top" width="45%"><code>add_reference&lt;T&gt;::type</code></td>
<td valign="top" width="45%">If T is a reference type
then leaves T unchanged, otherwise converts T to a
reference type. For example &quot;int&amp;&quot; remains
unchanged, but &quot;double&quot; becomes &quot;double&amp;&quot;.</td>
<td valign="top" width="33%"><p align="center">P</p>
</td>
</tr>
<tr>
<td valign="top" width="45%"><code>remove_bounds&lt;T&gt;::type</code></td>
<td valign="top" width="45%">If T is an array type then
removes the top level array qualifier from T, otherwise
leaves T unchanged. For example &quot;int[2][3]&quot;
becomes &quot;int[3]&quot;.</td>
<td valign="top" width="33%"><p align="center">P</p>
</td>
</tr>
</table>
<p>&nbsp;</p>
<h2><a name="fp"></a>Fundamental type properties</h2>
<p>Usage: &quot;class_name&lt;T&gt;::value&quot; is true if
indicated property is true, false otherwise. (Note that class_name&lt;T&gt;::value
is always defined as a compile time constant).</p>
<h3><a name="misc"></a>Miscellaneous</h3>
<table border="1" cellspacing="1" width="100%">
<tr>
<td width="37%"><p align="center">Expression</p>
</td>
<td width="36%"><p align="center">Description</p>
</td>
<td width="27%"><p align="center">Compiler</p>
</td>
</tr>
<tr>
<td width="37%"><div align="center"><center><pre><code>is_same&lt;T,U&gt;::value</code></pre>
</center></div></td>
<td width="36%"><p align="center">True if T and U are the
same type.</p>
</td>
<td width="27%"><p align="center">P</p>
</td>
</tr>
<tr>
<td width="37%"><div align="center"><center><pre>is_convertible&lt;T,U&gt;::value</pre>
</center></div></td>
<td width="36%"><p align="center">True if type T is
convertible to type U.</p>
</td>
<td width="27%">&nbsp;</td>
</tr>
<tr>
<td width="37%"><div align="center"><center><pre>alignment_of&lt;T&gt;::value</pre>
</center></div></td>
<td width="36%"><p align="center">An integral value
representing the minimum alignment requirements of type T
(strictly speaking defines a multiple of the type's
alignment requirement; for all compilers tested so far
however it does return the actual alignment).</p>
</td>
<td width="27%">&nbsp;</td>
</tr>
</table>
<p>&nbsp;</p>
<h3><a name="cv"></a>cv-Qualifiers</h3>
<p>The following classes determine what cv-qualifiers are present
on a type (see 3.93).</p>
<table border="1" cellpadding="7" cellspacing="1" width="100%">
<tr>
<td valign="top" width="37%"><p align="center">Expression.</p>
</td>
<td valign="top" width="37%"><p align="center">Description.</p>
</td>
<td valign="top" width="27%"><p align="center">Compiler.</p>
</td>
</tr>
<tr>
<td valign="top" width="37%"><code>is_const&lt;T&gt;::value</code></td>
<td valign="top" width="37%">True if type T is top-level
const qualified.</td>
<td valign="top" width="27%"><p align="center">P</p>
</td>
</tr>
<tr>
<td valign="top" width="37%"><code>is_volatile&lt;T&gt;::value</code></td>
<td valign="top" width="37%">True if type T is top-level
volatile qualified.</td>
<td valign="top" width="27%"><p align="center">P</p>
</td>
</tr>
</table>
<p>&nbsp;</p>
<h3><a name="ft"></a>Fundamental Types</h3>
<p>The following will only ever be true for cv-unqualified types;
these are closely based on the section 3.9 of the C++ Standard.</p>
<table border="1" cellpadding="7" cellspacing="1" width="100%">
<tr>
<td valign="top" width="45%"><p align="center">Expression.</p>
</td>
<td valign="top" width="45%"><p align="center">Description.</p>
</td>
<td valign="top" width="33%"><p align="center">Compiler.</p>
</td>
</tr>
<tr>
<td valign="top" width="45%"><code>is_void&lt;T&gt;::value</code></td>
<td valign="top" width="45%">True only if T is void.</td>
<td valign="top" width="33%">&nbsp;</td>
</tr>
<tr>
<td valign="top" width="45%"><code>is_standard_unsigned_integral&lt;T&gt;::value</code></td>
<td valign="top" width="45%">True only if T is one of the
standard unsigned integral types (3.9.1 p3) - unsigned
char, unsigned short, unsigned int, and unsigned long.</td>
<td valign="top" width="33%">&nbsp;</td>
</tr>
<tr>
<td valign="top" width="45%"><code>is_standard_signed_integral&lt;T&gt;::value</code></td>
<td valign="top" width="45%">True only if T is one of the
standard signed integral types (3.9.1 p2) - signed char,
short, int, and long.</td>
<td valign="top" width="33%">&nbsp;</td>
</tr>
<tr>
<td valign="top" width="45%"><code>is_standard_integral&lt;T&gt;::value</code></td>
<td valign="top" width="45%">True if T is a standard
integral type(3.9.1 p7) - T is either char, wchar_t, bool
or either is_standard_signed_integral&lt;T&gt;::value or
is_standard_integral&lt;T&gt;::value is true.</td>
<td valign="top" width="33%">&nbsp;</td>
</tr>
<tr>
<td valign="top" width="45%"><code>is_standard_float&lt;T&gt;::value</code></td>
<td valign="top" width="45%">True if T is one of the
standard floating point types(3.9.1 p8) - float, double
or long double.</td>
<td valign="top" width="33%">&nbsp;</td>
</tr>
<tr>
<td valign="top" width="45%"><code>is_standard_arithmetic&lt;T&gt;::value</code></td>
<td valign="top" width="45%">True if T is a standard
arithmetic type(3.9.1 p8) - implies is_standard_integral
or is_standard_float is true.</td>
<td valign="top" width="33%">&nbsp;</td>
</tr>
<tr>
<td valign="top" width="45%"><code>is_standard_fundamental&lt;T&gt;::value</code></td>
<td valign="top" width="45%">True if T is a standard
arithmetic type or if T is void.</td>
<td valign="top" width="33%">&nbsp;</td>
</tr>
<tr>
<td valign="top" width="45%"><code>is_extension_unsigned_integral&lt;T&gt;::value</code></td>
<td valign="top" width="45%">True for compiler specific
unsigned integral types.</td>
<td valign="top" width="33%">&nbsp;</td>
</tr>
<tr>
<td valign="top" width="45%"><code>is_extension_signed_integral&lt;T&gt;&gt;:value</code></td>
<td valign="top" width="45%">True for compiler specific
signed integral types.</td>
<td valign="top" width="33%">&nbsp;</td>
</tr>
<tr>
<td valign="top" width="45%"><code>is_extension_integral&lt;T&gt;::value</code></td>
<td valign="top" width="45%">True if either is_extension_unsigned_integral&lt;T&gt;::value
or is_extension_signed_integral&lt;T&gt;::value is true.</td>
<td valign="top" width="33%">&nbsp;</td>
</tr>
<tr>
<td valign="top" width="45%"><code>is_extension_float&lt;T&gt;::value</code></td>
<td valign="top" width="45%">True for compiler specific
floating point types.</td>
<td valign="top" width="33%">&nbsp;</td>
</tr>
<tr>
<td valign="top" width="45%"><code>is_extension_arithmetic&lt;T&gt;::value</code></td>
<td valign="top" width="45%">True if either is_extension_integral&lt;T&gt;::value
or is_extension_float&lt;T&gt;::value are true.</td>
<td valign="top" width="33%">&nbsp;</td>
</tr>
<tr>
<td valign="top" width="45%"><code>&nbsp;is_extension_fundamental&lt;T&gt;::value</code></td>
<td valign="top" width="45%">True if either is_extension_arithmetic&lt;T&gt;::value
or is_void&lt;T&gt;::value are true.</td>
<td valign="top" width="33%">&nbsp;</td>
</tr>
<tr>
<td valign="top" width="45%"><code>&nbsp;is_unsigned_integral&lt;T&gt;::value</code></td>
<td valign="top" width="45%">True if either is_standard_unsigned_integral&lt;T&gt;::value
or is_extention_unsigned_integral&lt;T&gt;::value are
true.</td>
<td valign="top" width="33%">&nbsp;</td>
</tr>
<tr>
<td valign="top" width="45%"><code>is_signed_integral&lt;T&gt;::value</code></td>
<td valign="top" width="45%">True if either is_standard_signed_integral&lt;T&gt;::value
or is_extention_signed_integral&lt;T&gt;&gt;::value are
true.</td>
<td valign="top" width="33%">&nbsp;</td>
</tr>
<tr>
<td valign="top" width="45%"><code>is_integral&lt;T&gt;::value</code></td>
<td valign="top" width="45%">True if either is_standard_integral&lt;T&gt;::value
or is_extention_integral&lt;T&gt;::value are true.</td>
<td valign="top" width="33%">&nbsp;</td>
</tr>
<tr>
<td valign="top" width="45%"><code>is_float&lt;T&gt;::value</code></td>
<td valign="top" width="45%">True if either is_standard_float&lt;T&gt;::value
or is_extention_float&lt;T&gt;::value are true.</td>
<td valign="top" width="33%">&nbsp;</td>
</tr>
<tr>
<td valign="top" width="45%"><code>is_arithmetic&lt;T&gt;::value</code></td>
<td valign="top" width="45%">True if either is_integral&lt;T&gt;::value
or is_float&lt;T&gt;::value are true.</td>
<td valign="top" width="33%">&nbsp;</td>
</tr>
<tr>
<td valign="top" width="45%"><code>is_fundamental&lt;T&gt;::value</code></td>
<td valign="top" width="45%">True if either is_arithmetic&lt;T&gt;::value
or is_void&lt;T&gt;::value are true.</td>
<td valign="top" width="33%">&nbsp;</td>
</tr>
</table>
<p>&nbsp;</p>
<h3><a name="ct"></a>Compound Types</h3>
<p>The following will only ever be true for cv-unqualified types,
as defined by the Standard.&nbsp;</p>
<table border="1" cellpadding="7" cellspacing="1" width="100%">
<tr>
<td valign="top" width="45%"><p align="center">Expression</p>
</td>
<td valign="top" width="45%"><p align="center">Description</p>
</td>
<td valign="top" width="33%"><p align="center">Compiler</p>
</td>
</tr>
<tr>
<td valign="top" width="45%"><code>is_array&lt;T&gt;::value</code></td>
<td valign="top" width="45%">True if T is an array type.</td>
<td valign="top" width="33%"><p align="center">P</p>
</td>
</tr>
<tr>
<td valign="top" width="45%"><code>is_pointer&lt;T&gt;::value</code></td>
<td valign="top" width="45%">True if T is a regular
pointer type - including function pointers - but
excluding pointers to member functions (3.9.2 p1 and 8.3.1).</td>
<td valign="top" width="33%"><p align="center">P</p>
</td>
</tr>
<tr>
<td valign="top" width="45%"><code>is_member_pointer&lt;T&gt;::value</code></td>
<td valign="top" width="45%">True if T is a pointer to a
non-static class member (3.9.2 p1 and 8.3.1).</td>
<td valign="top" width="33%"><p align="center">P</p>
</td>
</tr>
<tr>
<td valign="top" width="45%"><code>is_reference&lt;T&gt;::value</code></td>
<td valign="top" width="45%">True if T is a reference
type (3.9.2 p1 and 8.3.2).</td>
<td valign="top" width="33%"><p align="center">P</p>
</td>
</tr>
<tr>
<td valign="top" width="45%"><code>is_class&lt;T&gt;::value</code></td>
<td valign="top" width="45%">True if T is a class or
struct type.</td>
<td valign="top" width="33%"><p align="center">PD</p>
</td>
</tr>
<tr>
<td valign="top" width="45%"><code>is_union&lt;T&gt;::value</code></td>
<td valign="top" width="45%">True if T is a union type.</td>
<td valign="top" width="33%"><p align="center">C</p>
</td>
</tr>
<tr>
<td valign="top" width="45%"><code>is_enum&lt;T&gt;::value</code></td>
<td valign="top" width="45%">True if T is an enumerator
type.</td>
<td valign="top" width="33%"><p align="center">C</p>
</td>
</tr>
<tr>
<td valign="top" width="45%"><code>is_compound&lt;T&gt;::value</code></td>
<td valign="top" width="45%">True if T is any of the
above compound types.</td>
<td valign="top" width="33%"><p align="center">PD</p>
</td>
</tr>
</table>
<p>&nbsp;</p>
<h3><a name="ot"></a>Object/Scalar Types</h3>
<p>The following ignore any top level cv-qualifiers: if <code>class_name&lt;T&gt;::value</code>
is true then <code>class_name&lt;cv-qualified-T&gt;::value</code>
will also be true.</p>
<table border="1" cellpadding="7" cellspacing="1" width="100%">
<tr>
<td valign="top" width="45%"><p align="center">Expression</p>
</td>
<td valign="top" width="45%"><p align="center">Description</p>
</td>
<td valign="top" width="33%"><p align="center">Compiler</p>
</td>
</tr>
<tr>
<td valign="top" width="45%"><code>is_object&lt;T&gt;::value</code></td>
<td valign="top" width="45%">True if T is not a reference
type, or a (possibly cv-qualified) void type.</td>
<td valign="top" width="33%"><p align="center">P</p>
</td>
</tr>
<tr>
<td valign="top" width="45%"><code>is_standard_scalar&lt;T&gt;::value</code></td>
<td valign="top" width="45%">True if T is a standard
arithmetic type, an enumerated type, a pointer or a
member pointer.</td>
<td valign="top" width="33%"><p align="center">PD</p>
</td>
</tr>
<tr>
<td valign="top" width="45%"><code>is_extension_scalar&lt;T&gt;::value</code></td>
<td valign="top" width="45%">True if T is an extentions
arithmetic type, an enumerated type, a pointer or a
member pointer.</td>
<td valign="top" width="33%"><p align="center">PD</p>
</td>
</tr>
<tr>
<td valign="top" width="45%"><code>is_scalar&lt;T&gt;::value</code></td>
<td valign="top" width="45%">True if T is an arithmetic
type, an enumerated type, a pointer or a member pointer.</td>
<td valign="top" width="33%"><p align="center">PD</p>
</td>
</tr>
<tr>
<td valign="top" width="45%"><code>is_POD&lt;T&gt;::value</code></td>
<td valign="top" width="45%">True if T is a &quot;Plain
Old Data&quot; type (see 3.9 p2&amp;p3). Note that
although this requires compiler support to be correct in
all cases, if T is a scalar or an array of scalars then
we can correctly define T as a POD.</td>
<td valign="top" width="33%"><p align="center">PC</p>
</td>
</tr>
<tr>
<td valign="top" width="45%"><code>is_empty&lt;T&gt;::value</code></td>
<td valign="top" width="45%">True if T is an empty struct
or class. If the compiler implements the &quot;zero sized
empty base classes&quot; optimisation, then is_empty will
correctly guess whether T is empty. Relies upon is_class
to determine whether T is a class type. Screens out enum
types by using is_convertible&lt;T,int&gt;, this means
that empty classes that overload operator int(), will not
be classified as empty.</td>
<td valign="top" width="33%"><p align="center">PCD</p>
</td>
</tr>
<tr>
<td valign="top" width="45%"><code>has_trivial_constructor&lt;T&gt;::value</code></td>
<td valign="top" width="45%">True if T has a trivial
default constructor - that is T() is equivalent to memset.</td>
<td valign="top" width="33%"><p align="center">PC</p>
</td>
</tr>
<tr>
<td valign="top" width="45%"><code>has_trivial_copy&lt;T&gt;::value</code></td>
<td valign="top" width="45%">True if T has a trivial copy
constructor - that is T(const T&amp;) is equivalent to
memcpy.</td>
<td valign="top" width="33%"><p align="center">PC</p>
</td>
</tr>
<tr>
<td valign="top" width="45%"><code>has_trivial_assign&lt;T&gt;::value</code></td>
<td valign="top" width="45%">True if T has a trivial
assignment operator - that is if T::operator=(const T&amp;)
is equivalent to memcpy.</td>
<td valign="top" width="33%"><p align="center">PC</p>
</td>
</tr>
<tr>
<td valign="top" width="45%"><code>has_trivial_destructor&lt;T&gt;::value</code></td>
<td valign="top" width="45%">True if T has a trivial
destructor - that is if T::~T() has no effect.</td>
<td valign="top" width="33%"><p align="center">PC</p>
</td>
</tr>
</table>
<p>&nbsp;</p>
<h2><a name="cs"></a>Compiler Support Information</h2>
<p>The legends used in the tables above have the following
meanings:</p>
<table border="0" cellpadding="7" cellspacing="0" width="480">
<tr>
<td valign="top" width="50%"><p align="center">P</p>
</td>
<td valign="top" width="90%">Denotes that the class
requires support for partial specialisation of class
templates to work correctly.</td>
</tr>
<tr>
<td valign="top" width="50%"><p align="center">C</p>
</td>
<td valign="top" width="90%">Denotes that direct compiler
support for that traits class is required.</td>
</tr>
<tr>
<td valign="top" width="50%"><p align="center">D</p>
</td>
<td valign="top" width="90%">Denotes that the traits
class is dependent upon a class that requires direct
compiler support.</td>
</tr>
</table>
<p>&nbsp;</p>
<p>For those classes that are marked with a D or C, if compiler
support is not provided, this type trait may return &quot;false&quot;
when the correct value is actually &quot;true&quot;. The single
exception to this rule is &quot;is_class&quot;, which attempts to
guess whether or not T is really a class, and may return &quot;true&quot;
when the correct value is actually &quot;false&quot;. This can
happen if: T is a union, T is an enum, or T is a compiler-supplied
scalar type that is not specialised for in these type traits.</p>
<p><i>If there is no compiler support</i>, to ensure that these
traits <i>always</i> return the correct values, specialise 'is_enum'
for each user-defined enumeration type, 'is_union' for each user-defined
union type, 'is_empty' for each user-defined empty composite type,
and 'is_POD' for each user-defined POD type. The 'has_*' traits
should also be specialized if the user-defined type has those
traits and is <i>not</i> a POD.</p>
<p>The following rules are automatically enforced:</p>
<p>is_enum implies is_POD</p>
<p>is_POD implies has_*</p>
<p>This means, for example, if you have an empty POD-struct, just
specialize is_empty and is_POD, which will cause all the has_* to
also return true.</p>
<h2><a name="ec"></a>Example code</h2>
<p>Type-traits comes with two sample programs: <a
href="type_traits_test.cpp">type_traits_test.cpp</a> tests the
type traits classes - mostly this is a test of your compiler's
support for the concepts used in the type traits implementation,
while <a href="algo_opt_examples.cpp">algo_opt_examples.cpp</a>
uses the type traits classes to &quot;optimise&quot; some
familiar standard library algorithms.</p>
<p>There are four algorithm examples in algo_opt_examples.cpp:</p>
<table border="0" cellpadding="7" cellspacing="0" width="638">
<tr>
<td valign="top" width="50%"><pre>opt::copy</pre>
</td>
<td valign="top" width="50%">If the copy operation can be
performed using memcpy then does so, otherwise uses a
regular element by element copy (<i>c.f.</i> std::copy).</td>
</tr>
<tr>
<td valign="top" width="50%"><pre>opt::fill</pre>
</td>
<td valign="top" width="50%">If the fill operation can be
performed by memset, then does so, otherwise uses a
regular element by element assign. Also uses call_traits
to optimise how the parameters can be passed (<i>c.f.</i>
std::fill).</td>
</tr>
<tr>
<td valign="top" width="50%"><pre>opt::destroy_array</pre>
</td>
<td valign="top" width="50%">If the type in the array has
a trivial destructor then does nothing, otherwise calls
destructors for all elements in the array - this
algorithm is the reverse of std::uninitialized_copy / std::uninitialized_fill.</td>
</tr>
<tr>
<td valign="top" width="50%"><pre>opt::iter_swap</pre>
</td>
<td valign="top" width="50%">Determines whether the
iterator is a proxy-iterator: if it is then does a &quot;slow
and safe&quot; swap, otherwise calls std::swap on the
assumption that std::swap may be specialised for the
iterated type.</td>
</tr>
</table>
<p>&nbsp;</p>
<hr>
<p>Revised 08<sup>th</sup> March 2000</p>
<p><EFBFBD> Copyright boost.org 2000. Permission to copy, use, modify,
sell and distribute this document is granted provided this
copyright notice appears in all copies. This document is provided
&quot;as is&quot; without express or implied warranty, and with
no claim as to its suitability for any purpose.</p>
<p>Based on contributions by Steve Cleary, Beman Dawes, Howard
Hinnant and John Maddock.</p>
<p>Maintained by <a href="mailto:John_Maddock@compuserve.com">John
Maddock</a>, the latest version of this file can be found at <a
href="http://www.boost.org/">www.boost.org</a>, and the boost
discussion list at <a href="http://www.egroups.com/list/boost">www.egroups.com/list/boost</a>.</p>
</body>
</html>

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@ -1,595 +0,0 @@
// (C) Copyright Steve Cleary, Beman Dawes, Howard Hinnant & John Maddock 2000.
// Permission to copy, use, modify, sell and
// distribute this software is granted provided this copyright notice appears
// in all copies. This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
// standalone test program for <boost/type_traits.hpp>
/* Release notes:
31st July 2000:
Added extra tests for is_empty, is_convertible, alignment_of.
23rd July 2000:
Removed all call_traits tests to call_traits_test.cpp
Removed all compressed_pair tests to compressed_pair_tests.cpp
Improved tests macros
Tidied up specialistions of type_types classes for test cases.
*/
#include <iostream>
#include <typeinfo>
#include <boost/type_traits.hpp>
#include "type_traits_test.hpp"
using namespace boost;
// Since there is no compiler support, we should specialize:
// is_enum for all enumerations (is_enum implies is_POD)
// is_union for all unions
// is_empty for all empty composites
// is_POD for all PODs (except enums) (is_POD implies has_*)
// has_* for any UDT that has that trait and is not POD
enum enum_UDT{ one, two, three };
struct UDT
{
UDT();
~UDT();
UDT(const UDT&);
UDT& operator=(const UDT&);
int i;
void f1();
int f2();
int f3(int);
int f4(int, float);
};
struct POD_UDT { int x; };
struct empty_UDT{ ~empty_UDT(){}; };
struct empty_POD_UDT{};
union union_UDT
{
int x;
double y;
~union_UDT();
};
union POD_union_UDT
{
int x;
double y;
};
union empty_union_UDT
{
~empty_union_UDT();
};
union empty_POD_union_UDT{};
#ifndef BOOST_NO_INCLASS_MEMBER_INITIALIZATION
namespace boost {
template <> struct is_enum<enum_UDT>
{ static const bool value = true; };
template <> struct is_POD<POD_UDT>
{ static const bool value = true; };
// this type is not POD, so we have to specialize the has_* individually
template <> struct has_trivial_constructor<empty_UDT>
{ static const bool value = true; };
template <> struct has_trivial_copy<empty_UDT>
{ static const bool value = true; };
template <> struct has_trivial_assign<empty_UDT>
{ static const bool value = true; };
template <> struct is_POD<empty_POD_UDT>
{ static const bool value = true; };
template <> struct is_union<union_UDT>
{ static const bool value = true; };
template <> struct is_union<POD_union_UDT>
{ static const bool value = true; };
template <> struct is_POD<POD_union_UDT>
{ static const bool value = true; };
template <> struct is_union<empty_union_UDT>
{ static const bool value = true; };
// this type is not POD, so we have to specialize the has_* individually
template <> struct has_trivial_constructor<empty_union_UDT>
{ static const bool value = true; };
template <> struct has_trivial_copy<empty_union_UDT>
{ static const bool value = true; };
template <> struct has_trivial_assign<empty_union_UDT>
{ static const bool value = true; };
template <> struct is_union<empty_POD_union_UDT>
{ static const bool value = true; };
template <> struct is_POD<empty_POD_union_UDT>
{ static const bool value = true; };
}
#else
namespace boost {
template <> struct is_enum<enum_UDT>
{ enum{ value = true }; };
template <> struct is_POD<POD_UDT>
{ enum{ value = true }; };
// this type is not POD, so we have to specialize the has_* individually
template <> struct has_trivial_constructor<empty_UDT>
{ enum{ value = true }; };
template <> struct has_trivial_copy<empty_UDT>
{ enum{ value = true }; };
template <> struct has_trivial_assign<empty_UDT>
{ enum{ value = true }; };
template <> struct is_POD<empty_POD_UDT>
{ enum{ value = true }; };
template <> struct is_union<union_UDT>
{ enum{ value = true }; };
template <> struct is_union<POD_union_UDT>
{ enum{ value = true }; };
template <> struct is_POD<POD_union_UDT>
{ enum{ value = true }; };
template <> struct is_union<empty_union_UDT>
{ enum{ value = true }; };
// this type is not POD, so we have to specialize the has_* individually
template <> struct has_trivial_constructor<empty_union_UDT>
{ enum{ value = true }; };
template <> struct has_trivial_copy<empty_union_UDT>
{ enum{ value = true }; };
template <> struct has_trivial_assign<empty_union_UDT>
{ enum{ value = true }; };
template <> struct is_union<empty_POD_union_UDT>
{ enum{ value = true }; };
template <> struct is_POD<empty_POD_union_UDT>
{ enum{ value = true }; };
}
#endif
class Base { };
class Deriverd : public Base { };
class NonDerived { };
enum enum1
{
one_,two_
};
enum enum2
{
three_,four_
};
struct VB
{
virtual ~VB(){};
};
struct VD : VB
{
~VD(){};
};
// Steve: All comments that I (Steve Cleary) have added below are prefixed with
// "Steve:" The failures that BCB4 has on the tests are due to Borland's
// not considering cv-qual's as a part of the type -- they are considered
// compiler hints only. These failures should be fixed before long.
int main()
{
std::cout << "Checking type operations..." << std::endl << std::endl;
// cv-qualifiers applied to reference types should have no effect
// declare these here for later use with is_reference and remove_reference:
typedef int& r_type;
typedef const r_type cr_type;
type_test(int, remove_reference<int>::type)
type_test(const int, remove_reference<const int>::type)
type_test(int, remove_reference<int&>::type)
type_test(const int, remove_reference<const int&>::type)
type_test(volatile int, remove_reference<volatile int&>::type)
type_test(int, remove_reference<cr_type>::type)
type_test(int, remove_const<const int>::type)
// Steve: fails on BCB4
type_test(volatile int, remove_const<volatile int>::type)
// Steve: fails on BCB4
type_test(volatile int, remove_const<const volatile int>::type)
type_test(int, remove_const<int>::type)
type_test(int*, remove_const<int* const>::type)
type_test(int, remove_volatile<volatile int>::type)
// Steve: fails on BCB4
type_test(const int, remove_volatile<const int>::type)
// Steve: fails on BCB4
type_test(const int, remove_volatile<const volatile int>::type)
type_test(int, remove_volatile<int>::type)
type_test(int*, remove_volatile<int* volatile>::type)
type_test(int, remove_cv<volatile int>::type)
type_test(int, remove_cv<const int>::type)
type_test(int, remove_cv<const volatile int>::type)
type_test(int, remove_cv<int>::type)
type_test(int*, remove_cv<int* volatile>::type)
type_test(int*, remove_cv<int* const>::type)
type_test(int*, remove_cv<int* const volatile>::type)
type_test(const int *, remove_cv<const int * const>::type)
type_test(int, remove_bounds<int>::type)
type_test(int*, remove_bounds<int*>::type)
type_test(int, remove_bounds<int[3]>::type)
type_test(int[3], remove_bounds<int[2][3]>::type)
std::cout << std::endl << "Checking type properties..." << std::endl << std::endl;
value_test(true, (is_same<int, int>::value))
value_test(false, (is_same<int, const int>::value))
value_test(false, (is_same<int, int&>::value))
value_test(false, (is_same<int*, const int*>::value))
value_test(false, (is_same<int*, int*const>::value))
value_test(false, (is_same<int, int[2]>::value))
value_test(false, is_const<int>::value)
value_test(true, is_const<const int>::value)
value_test(false, is_const<volatile int>::value)
value_test(true, is_const<const volatile int>::value)
value_test(false, is_volatile<int>::value)
value_test(false, is_volatile<const int>::value)
value_test(true, is_volatile<volatile int>::value)
value_test(true, is_volatile<const volatile int>::value)
value_test(true, is_void<void>::value)
// Steve: fails on BCB4
// JM: but looks as though it should according to [3.9.3p1]?
//value_test(false, is_void<const void>::value)
value_test(false, is_void<int>::value)
value_test(false, is_standard_unsigned_integral<UDT>::value)
value_test(false, is_standard_unsigned_integral<void>::value)
value_test(false, is_standard_unsigned_integral<bool>::value)
value_test(false, is_standard_unsigned_integral<char>::value)
value_test(false, is_standard_unsigned_integral<signed char>::value)
value_test(true, is_standard_unsigned_integral<unsigned char>::value)
value_test(false, is_standard_unsigned_integral<wchar_t>::value)
value_test(false, is_standard_unsigned_integral<short>::value)
value_test(true, is_standard_unsigned_integral<unsigned short>::value)
value_test(false, is_standard_unsigned_integral<int>::value)
value_test(true, is_standard_unsigned_integral<unsigned int>::value)
value_test(false, is_standard_unsigned_integral<long>::value)
value_test(true, is_standard_unsigned_integral<unsigned long>::value)
value_test(false, is_standard_unsigned_integral<float>::value)
value_test(false, is_standard_unsigned_integral<double>::value)
value_test(false, is_standard_unsigned_integral<long double>::value)
#ifdef ULLONG_MAX
value_test(false, is_standard_unsigned_integral<long long>::value)
value_test(false, is_standard_unsigned_integral<unsigned long long>::value)
#endif
#if defined(__BORLANDC__) || defined(_MSC_VER)
value_test(false, is_standard_unsigned_integral<__int64>::value)
value_test(false, is_standard_unsigned_integral<unsigned __int64>::value)
#endif
value_test(false, is_standard_signed_integral<UDT>::value)
value_test(false, is_standard_signed_integral<void>::value)
value_test(false, is_standard_signed_integral<bool>::value)
value_test(false, is_standard_signed_integral<char>::value)
value_test(true, is_standard_signed_integral<signed char>::value)
value_test(false, is_standard_signed_integral<unsigned char>::value)
value_test(false, is_standard_signed_integral<wchar_t>::value)
value_test(true, is_standard_signed_integral<short>::value)
value_test(false, is_standard_signed_integral<unsigned short>::value)
value_test(true, is_standard_signed_integral<int>::value)
value_test(false, is_standard_signed_integral<unsigned int>::value)
value_test(true, is_standard_signed_integral<long>::value)
value_test(false, is_standard_signed_integral<unsigned long>::value)
value_test(false, is_standard_signed_integral<float>::value)
value_test(false, is_standard_signed_integral<double>::value)
value_test(false, is_standard_signed_integral<long double>::value)
#ifdef ULLONG_MAX
value_test(false, is_standard_signed_integral<long long>::value)
value_test(false, is_standard_signed_integral<unsigned long long>::value)
#endif
#if defined(__BORLANDC__) || defined(_MSC_VER)
value_test(false, is_standard_signed_integral<__int64>::value)
value_test(false, is_standard_signed_integral<unsigned __int64>::value)
#endif
value_test(false, is_standard_arithmetic<UDT>::value)
value_test(false, is_standard_arithmetic<void>::value)
value_test(true, is_standard_arithmetic<bool>::value)
value_test(true, is_standard_arithmetic<char>::value)
value_test(true, is_standard_arithmetic<signed char>::value)
value_test(true, is_standard_arithmetic<unsigned char>::value)
value_test(true, is_standard_arithmetic<wchar_t>::value)
value_test(true, is_standard_arithmetic<short>::value)
value_test(true, is_standard_arithmetic<unsigned short>::value)
value_test(true, is_standard_arithmetic<int>::value)
value_test(true, is_standard_arithmetic<unsigned int>::value)
value_test(true, is_standard_arithmetic<long>::value)
value_test(true, is_standard_arithmetic<unsigned long>::value)
value_test(true, is_standard_arithmetic<float>::value)
value_test(true, is_standard_arithmetic<double>::value)
value_test(true, is_standard_arithmetic<long double>::value)
#ifdef ULLONG_MAX
value_test(false, is_standard_arithmetic<long long>::value)
value_test(false, is_standard_arithmetic<unsigned long long>::value)
#endif
#if defined(__BORLANDC__) || defined(_MSC_VER)
value_test(false, is_standard_arithmetic<__int64>::value)
value_test(false, is_standard_arithmetic<unsigned __int64>::value)
#endif
value_test(false, is_standard_fundamental<UDT>::value)
value_test(true, is_standard_fundamental<void>::value)
value_test(true, is_standard_fundamental<bool>::value)
value_test(true, is_standard_fundamental<char>::value)
value_test(true, is_standard_fundamental<signed char>::value)
value_test(true, is_standard_fundamental<unsigned char>::value)
value_test(true, is_standard_fundamental<wchar_t>::value)
value_test(true, is_standard_fundamental<short>::value)
value_test(true, is_standard_fundamental<unsigned short>::value)
value_test(true, is_standard_fundamental<int>::value)
value_test(true, is_standard_fundamental<unsigned int>::value)
value_test(true, is_standard_fundamental<long>::value)
value_test(true, is_standard_fundamental<unsigned long>::value)
value_test(true, is_standard_fundamental<float>::value)
value_test(true, is_standard_fundamental<double>::value)
value_test(true, is_standard_fundamental<long double>::value)
#ifdef ULLONG_MAX
value_test(false, is_standard_fundamental<long long>::value)
value_test(false, is_standard_fundamental<unsigned long long>::value)
#endif
#if defined(__BORLANDC__) || defined(_MSC_VER)
value_test(false, is_standard_fundamental<__int64>::value)
value_test(false, is_standard_fundamental<unsigned __int64>::value)
#endif
value_test(false, is_arithmetic<UDT>::value)
value_test(true, is_arithmetic<char>::value)
value_test(true, is_arithmetic<signed char>::value)
value_test(true, is_arithmetic<unsigned char>::value)
value_test(true, is_arithmetic<wchar_t>::value)
value_test(true, is_arithmetic<short>::value)
value_test(true, is_arithmetic<unsigned short>::value)
value_test(true, is_arithmetic<int>::value)
value_test(true, is_arithmetic<unsigned int>::value)
value_test(true, is_arithmetic<long>::value)
value_test(true, is_arithmetic<unsigned long>::value)
value_test(true, is_arithmetic<float>::value)
value_test(true, is_arithmetic<double>::value)
value_test(true, is_arithmetic<long double>::value)
value_test(true, is_arithmetic<bool>::value)
#ifdef ULLONG_MAX
value_test(true, is_arithmetic<long long>::value)
value_test(true, is_arithmetic<unsigned long long>::value)
#endif
#if defined(__BORLANDC__) || defined(_MSC_VER)
value_test(true, is_arithmetic<__int64>::value)
value_test(true, is_arithmetic<unsigned __int64>::value)
#endif
value_test(false, is_array<int>::value)
value_test(false, is_array<int*>::value)
value_test(true, is_array<int[2]>::value)
value_test(true, is_array<int[2][3]>::value)
value_test(true, is_array<UDT[2]>::value)
typedef void(*f1)();
typedef int(*f2)(int);
typedef int(*f3)(int, bool);
typedef void (UDT::*mf1)();
typedef int (UDT::*mf2)();
typedef int (UDT::*mf3)(int);
typedef int (UDT::*mf4)(int, float);
value_test(false, is_pointer<int>::value)
value_test(false, is_pointer<int&>::value)
value_test(true, is_pointer<int*>::value)
// Steve: was 'true', should be 'false', via 3.9.2p3, 3.9.3p1
value_test(false, is_pointer<int*const>::value)
// Steve: was 'true', should be 'false', via 3.9.2p3, 3.9.3p1
value_test(false, is_pointer<int*volatile>::value)
// Steve: was 'true', should be 'false', via 3.9.2p3, 3.9.3p1
value_test(false, is_pointer<int*const volatile>::value)
value_test(true, is_pointer<f1>::value)
value_test(true, is_pointer<f2>::value)
value_test(true, is_pointer<f3>::value)
// Steve: was 'true', should be 'false', via 3.9.2p3
value_test(false, is_pointer<mf1>::value)
// Steve: was 'true', should be 'false', via 3.9.2p3
value_test(false, is_pointer<mf2>::value)
// Steve: was 'true', should be 'false', via 3.9.2p3
value_test(false, is_pointer<mf3>::value)
// Steve: was 'true', should be 'false', via 3.9.2p3
value_test(false, is_pointer<mf4>::value)
value_test(false, is_reference<bool>::value)
value_test(true, is_reference<int&>::value)
value_test(true, is_reference<const int&>::value)
value_test(true, is_reference<volatile int &>::value)
value_test(true, is_reference<r_type>::value)
value_test(true, is_reference<cr_type>::value)
value_test(false, is_class<int>::value)
value_test(false, is_class<const int>::value)
value_test(false, is_class<volatile int>::value)
value_test(false, is_class<int*>::value)
value_test(false, is_class<int* const>::value)
value_test(false, is_class<int[2]>::value)
value_test(false, is_class<int&>::value)
value_test(false, is_class<mf4>::value)
value_test(false, is_class<f1>::value)
value_test(false, is_class<enum_UDT>::value)
value_test(true, is_class<UDT>::value)
value_test(true, is_class<UDT const>::value)
value_test(true, is_class<UDT volatile>::value)
value_test(true, is_class<empty_UDT>::value)
value_test(true, is_class<std::iostream>::value)
value_test(false, is_class<UDT*>::value)
value_test(false, is_class<UDT[2]>::value)
value_test(false, is_class<UDT&>::value)
value_test(true, is_object<int>::value)
value_test(true, is_object<UDT>::value)
value_test(false, is_object<int&>::value)
value_test(false, is_object<void>::value)
value_test(true, is_standard_scalar<int>::value)
value_test(true, is_extension_scalar<void*>::value)
value_test(false, is_enum<int>::value)
value_test(true, is_enum<enum_UDT>::value)
value_test(false, is_member_pointer<f1>::value)
value_test(false, is_member_pointer<f2>::value)
value_test(false, is_member_pointer<f3>::value)
value_test(true, is_member_pointer<mf1>::value)
value_test(true, is_member_pointer<mf2>::value)
value_test(true, is_member_pointer<mf3>::value)
value_test(true, is_member_pointer<mf4>::value)
value_test(false, is_empty<int>::value)
value_test(false, is_empty<int*>::value)
value_test(false, is_empty<int&>::value)
#ifdef __MWERKS__
// apparent compiler bug causes this to fail to compile:
value_fail(false, is_empty<int[2]>::value)
#else
value_test(false, is_empty<int[2]>::value)
#endif
value_test(false, is_empty<f1>::value)
value_test(false, is_empty<mf1>::value)
value_test(false, is_empty<UDT>::value)
value_test(true, is_empty<empty_UDT>::value)
value_test(true, is_empty<empty_POD_UDT>::value)
value_test(true, is_empty<empty_union_UDT>::value)
value_test(false, is_empty<enum_UDT>::value)
value_test(true, has_trivial_constructor<int>::value)
value_test(true, has_trivial_constructor<int*>::value)
value_test(true, has_trivial_constructor<int*const>::value)
value_test(true, has_trivial_constructor<const int>::value)
value_test(true, has_trivial_constructor<volatile int>::value)
value_test(true, has_trivial_constructor<int[2]>::value)
value_test(true, has_trivial_constructor<int[3][2]>::value)
value_test(true, has_trivial_constructor<int[2][4][5][6][3]>::value)
value_test(true, has_trivial_constructor<f1>::value)
value_test(true, has_trivial_constructor<mf2>::value)
value_test(false, has_trivial_constructor<UDT>::value)
value_test(true, has_trivial_constructor<empty_UDT>::value)
value_test(true, has_trivial_constructor<enum_UDT>::value)
value_test(true, has_trivial_copy<int>::value)
value_test(true, has_trivial_copy<int*>::value)
value_test(true, has_trivial_copy<int*const>::value)
value_test(true, has_trivial_copy<const int>::value)
// Steve: was 'false' -- should be 'true' via 3.9p3, 3.9p10
value_test(true, has_trivial_copy<volatile int>::value)
value_test(true, has_trivial_copy<int[2]>::value)
value_test(true, has_trivial_copy<int[3][2]>::value)
value_test(true, has_trivial_copy<int[2][4][5][6][3]>::value)
value_test(true, has_trivial_copy<f1>::value)
value_test(true, has_trivial_copy<mf2>::value)
value_test(false, has_trivial_copy<UDT>::value)
value_test(true, has_trivial_copy<empty_UDT>::value)
value_test(true, has_trivial_copy<enum_UDT>::value)
value_test(true, has_trivial_assign<int>::value)
value_test(true, has_trivial_assign<int*>::value)
value_test(true, has_trivial_assign<int*const>::value)
value_test(true, has_trivial_assign<const int>::value)
// Steve: was 'false' -- should be 'true' via 3.9p3, 3.9p10
value_test(true, has_trivial_assign<volatile int>::value)
value_test(true, has_trivial_assign<int[2]>::value)
value_test(true, has_trivial_assign<int[3][2]>::value)
value_test(true, has_trivial_assign<int[2][4][5][6][3]>::value)
value_test(true, has_trivial_assign<f1>::value)
value_test(true, has_trivial_assign<mf2>::value)
value_test(false, has_trivial_assign<UDT>::value)
value_test(true, has_trivial_assign<empty_UDT>::value)
value_test(true, has_trivial_assign<enum_UDT>::value)
value_test(true, has_trivial_destructor<int>::value)
value_test(true, has_trivial_destructor<int*>::value)
value_test(true, has_trivial_destructor<int*const>::value)
value_test(true, has_trivial_destructor<const int>::value)
value_test(true, has_trivial_destructor<volatile int>::value)
value_test(true, has_trivial_destructor<int[2]>::value)
value_test(true, has_trivial_destructor<int[3][2]>::value)
value_test(true, has_trivial_destructor<int[2][4][5][6][3]>::value)
value_test(true, has_trivial_destructor<f1>::value)
value_test(true, has_trivial_destructor<mf2>::value)
value_test(false, has_trivial_destructor<UDT>::value)
value_test(false, has_trivial_destructor<empty_UDT>::value)
value_test(true, has_trivial_destructor<enum_UDT>::value)
value_test(true, is_POD<int>::value)
value_test(true, is_POD<int*>::value)
// Steve: was 'true', should be 'false', via 3.9p10
value_test(false, is_POD<int&>::value)
value_test(true, is_POD<int*const>::value)
value_test(true, is_POD<const int>::value)
// Steve: was 'false', should be 'true', via 3.9p10
value_test(true, is_POD<volatile int>::value)
// Steve: was 'true', should be 'false', via 3.9p10
value_test(false, is_POD<const int&>::value)
value_test(true, is_POD<int[2]>::value)
value_test(true, is_POD<int[3][2]>::value)
value_test(true, is_POD<int[2][4][5][6][3]>::value)
value_test(true, is_POD<f1>::value)
value_test(true, is_POD<mf2>::value)
value_test(false, is_POD<UDT>::value)
value_test(false, is_POD<empty_UDT>::value)
value_test(true, is_POD<enum_UDT>::value)
value_test(true, (boost::is_convertible<Deriverd,Base>::value));
value_test(true, (boost::is_convertible<Deriverd,Deriverd>::value));
value_test(true, (boost::is_convertible<Base,Base>::value));
value_test(false, (boost::is_convertible<Base,Deriverd>::value));
value_test(true, (boost::is_convertible<Deriverd,Deriverd>::value));
value_test(false, (boost::is_convertible<NonDerived,Base>::value));
//value_test(false, (boost::is_convertible<boost::noncopyable, boost::noncopyable>::value));
value_test(true, (boost::is_convertible<float,int>::value));
#if defined(BOOST_MSVC6_MEMBER_TEMPLATES) || !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
value_test(false, (boost::is_convertible<float,void>::value));
value_test(false, (boost::is_convertible<void,float>::value));
value_test(true, (boost::is_convertible<void,void>::value));
#endif
value_test(true, (boost::is_convertible<enum1, int>::value));
value_test(true, (boost::is_convertible<Deriverd*, Base*>::value));
value_test(false, (boost::is_convertible<Base*, Deriverd*>::value));
value_test(true, (boost::is_convertible<Deriverd&, Base&>::value));
value_test(false, (boost::is_convertible<Base&, Deriverd&>::value));
value_test(true, (boost::is_convertible<const Deriverd*, const Base*>::value));
value_test(false, (boost::is_convertible<const Base*, const Deriverd*>::value));
value_test(true, (boost::is_convertible<const Deriverd&, const Base&>::value));
value_test(false, (boost::is_convertible<const Base&, const Deriverd&>::value));
value_test(false, (boost::is_convertible<const int *, int*>::value));
value_test(false, (boost::is_convertible<const int&, int&>::value));
value_test(false, (boost::is_convertible<int*, int[2]>::value));
value_test(false, (boost::is_convertible<const int*, int[3]>::value));
value_test(true, (boost::is_convertible<const int&, int>::value));
value_test(true, (boost::is_convertible<int(&)[4], const int*>::value));
value_test(true, (boost::is_convertible<int(&)(int), int(*)(int)>::value));
value_test(true, (boost::is_convertible<int *, const int*>::value));
value_test(true, (boost::is_convertible<int&, const int&>::value));
value_test(true, (boost::is_convertible<int[2], int*>::value));
value_test(true, (boost::is_convertible<int[2], const int*>::value));
value_test(false, (boost::is_convertible<const int[2], int*>::value));
align_test(int);
align_test(char);
align_test(double);
align_test(int[4]);
align_test(int(*)(int));
#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
align_test(char&);
align_test(char (&)(int));
align_test(char(&)[4]);
#endif
align_test(int*);
//align_test(const int);
align_test(VB);
align_test(VD);
std::cout << std::endl << test_count << " tests completed (" << failures << " failures)... press any key to exit";
std::cin.get();
return failures;
}

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@ -1,106 +0,0 @@
// boost::compressed_pair test program
// (C) Copyright John Maddock 2000. Permission to copy, use, modify, sell and
// distribute this software is granted provided this copyright notice appears
// in all copies. This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
// common test code for type_traits_test.cpp/call_traits_test.cpp/compressed_pair_test.cpp
#ifndef BOOST_TYPE_TRAITS_TEST_HPP
#define BOOST_TYPE_TRAITS_TEST_HPP
//
// this one is here just to suppress warnings:
//
template <class T>
bool do_compare(T i, T j)
{
return i == j;
}
//
// this one is to verify that a constant is indeed a
// constant-integral-expression:
//
template <int>
struct ct_checker
{
};
#define BOOST_DO_JOIN( X, Y ) BOOST_DO_JOIN2(X,Y)
#define BOOST_DO_JOIN2(X, Y) X ## Y
#define BOOST_JOIN( X, Y ) BOOST_DO_JOIN( X, Y )
#define value_test(v, x) ++test_count;\
typedef ct_checker<(x)> BOOST_JOIN(this_is_a_compile_time_check_, __LINE__);\
if(!do_compare((int)v,(int)x)){++failures; std::cout << "checking value of " << #x << "...failed" << std::endl;}
#define value_fail(v, x) ++test_count; ++failures; std::cout << "checking value of " << #x << "...failed" << std::endl;
#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
#define type_test(v, x) ++test_count;\
if(do_compare(boost::is_same<v, x>::value, false)){\
++failures; \
std::cout << "checking type of " << #x << "...failed" << std::endl; \
std::cout << " expected type was " << #v << std::endl; \
std::cout << " " << typeid(boost::is_same<v, x>).name() << "::value is false" << std::endl; }
#else
#define type_test(v, x) ++test_count;\
if(typeid(v) != typeid(x)){\
++failures; \
std::cout << "checking type of " << #x << "...failed" << std::endl; \
std::cout << " expected type was " << #v << std::endl; \
std::cout << " " << "typeid(" #v ") != typeid(" #x ")" << std::endl; }
#endif
template <class T>
struct test_align
{
struct padded
{
char c;
T t;
};
static void do_it()
{
padded p;
unsigned a = reinterpret_cast<char*>(&(p.t)) - reinterpret_cast<char*>(&p);
value_test(a, boost::alignment_of<T>::value);
}
};
#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
template <class T>
struct test_align<T&>
{
static void do_it()
{
//
// we can't do the usual test because we can't take the address
// of a reference, so check that the result is the same as for a
// pointer type instead:
value_test(boost::alignment_of<T*>::value, boost::alignment_of<T&>::value);
}
};
#endif
#define align_test(T) test_align<T>::do_it()
//
// define tests here
unsigned failures = 0;
unsigned test_count = 0;
//
// turn off some warnings:
#ifdef __BORLANDC__
#pragma option -w-8004
#endif
#ifdef BOOST_MSVC
#pragma warning (disable: 4018)
#endif
#endif // BOOST_TYPE_TRAITS_TEST_HPP

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@ -1,104 +1,196 @@
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>Header boost/utility.hpp Documentation</title>
</head>
<body bgcolor="#FFFFFF" text="#000000">
<h1><img src="../../c++boost.gif" alt="c++boost.gif (8819 bytes)" align="center" WIDTH="277" HEIGHT="86">Header
<a href="../../boost/utility.hpp">boost/utility.hpp</a></h1>
<p>The entire contents of the header <code><a href="../../boost/utility.hpp">&lt;boost/utility.hpp&gt;</a></code>
are in <code>namespace boost</code>.</p>
<h2>Contents</h2>
<ul>
<li>Function templates <a href="#functions next">next() and prior()</a></li>
<li>Class <a href="#Class noncopyable">noncopyable</a></li>
<li>Function template <a href="tie.html">tie()</a> and supporting class tied.</li>
</ul>
<h2> <a name="functions next">Function</a> templates next() and prior()</h2>
<p>Certain data types, such as the C++ Standard Library's forward and
bidirectional iterators, do not provide addition and subtraction via operator+()
or operator-().&nbsp; This means that non-modifying computation of the next or
prior value requires a temporary, even though operator++() or operator--() is
provided.&nbsp; It also means that writing code like <code>itr+1</code> inside a
template restricts the iterator category to random access iterators.</p>
<p>The next() and prior() functions provide a simple way around these problems:</p>
<blockquote>
<pre>template &lt;class T&gt;
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>Header boost/utility.hpp Documentation</title>
</head>
<body bgcolor="#FFFFFF" text="#000000">
<h1><img src="../../boost.png" alt="boost.png (6897 bytes)" align="center" WIDTH="277" HEIGHT="86">Header
<a href="../../boost/utility.hpp">boost/utility.hpp</a></h1>
<p>The entire contents of the header <code><a href="../../boost/utility.hpp">&lt;boost/utility.hpp&gt;</a></code>
are in <code>namespace boost</code>.</p>
<h2>Contents</h2>
<ul>
<li>
Class templates supporting the <a href="base_from_member.html">base-from-member
idiom</a></li>
<li>
Function templates <a href="#checked_delete">checked_delete() and
checked_array_delete()</a></li>
<li>
Function templates <a href="#functions_next_prior">next() and prior()</a></li>
<li>
Class <a href="#Class_noncopyable">noncopyable</a></li>
<li>
Function template <a href="#addressof">addressof()</a></li>
<li>Class template <a href="#result_of">result_of</a></li>
<li><a href="index.html">Other utilities not part of <code>utility.hpp</code></a></li>
</ul>
<h2>
Function templates <a name="checked_delete">checked_delete</a>() and
checked_array_delete()</h2>
<p>See <a href="checked_delete.html">separate documentation</a>.</p>
<h2>
<a name="functions_next_prior">Function</a> templates next() and prior()</h2>
<p>Certain data types, such as the C++ Standard Library's forward and bidirectional
iterators, do not provide addition and subtraction via operator+() or
operator-().&nbsp; This means that non-modifying computation of the next or
prior value requires a temporary, even though operator++() or operator--() is
provided.&nbsp; It also means that writing code like <code>itr+1</code> inside
a template restricts the iterator category to random access iterators.</p>
<p>The next() and prior() functions provide a simple way around these problems:</p>
<blockquote>
<pre>template &lt;class T&gt;
T next(T x) { return ++x; }
template &lt;class X&gt;
T prior(T x) { return --x; }</pre>
template &lt;class T, class Distance&gt;
T next(T x, Distance n)
{
std::advance(x, n);
return x;
}
</blockquote>
template &lt;class T&gt;
T prior(T x) { return --x; }
<p>Usage is simple:</p>
<blockquote>
<pre>const std::list&lt;T&gt;::iterator p = get_some_iterator();
const std::list&lt;T&gt;::iterator prev = boost::prior(p);</pre>
</blockquote>
<p>Contributed by <a href="../../people/dave_abrahams.htm">Dave Abrahams</a>.</p>
<h2><a name="Class noncopyable">Class noncopyable</a></h2>
<p>Class <strong>noncopyable</strong> is a base class.&nbsp; Derive your own class from <strong>noncopyable</strong>
when you want to prohibit copy construction and copy assignment.</p>
<p>Some objects, particularly those which hold complex resources like files or
network connections, have no sensible copy semantics.&nbsp; Sometimes there are
possible copy semantics, but these would be of very limited usefulness and be
very difficult to implement correctly.&nbsp; Sometimes you're implementing a class that doesn't need to be copied
just yet and you don't want to take the time to write the appropriate functions.&nbsp;
Deriving from <b> noncopyable</b> will prevent the otherwise implicitly-generated
functions (which don't have the proper semantics) from becoming a trap for other programmers.</p>
<p>The traditional way to deal with these is to declare a private copy constructor and copy assignment, and then
document why this is done.&nbsp; But deriving from <b>noncopyable</b> is simpler
and clearer, and doesn't require additional documentation.</p>
<p>The program <a href="noncopyable_test.cpp">noncopyable_test.cpp</a> can be
used to verify class <b>noncopyable</b> works as expected. It has have been run successfully under
GCC 2.95, Metrowerks
CodeWarrior 5.0, and Microsoft Visual C++ 6.0 sp 3.</p>
<p>Contributed by <a href="../../people/dave_abrahams.htm">Dave Abrahams</a>.</p>
<h3>Example</h3>
<blockquote>
<pre>// inside one of your own headers ...
template &lt;class T, class Distance&gt;
T prior(T x, Distance n)
{
std::advance(x, -n);
return x;
}</pre>
</blockquote>
<p>Usage is simple:</p>
<blockquote>
<pre>const std::list&lt;T&gt;::iterator p = get_some_iterator();
const std::list&lt;T&gt;::iterator prev = boost::prior(p);
const std::list&lt;T&gt;::iterator next = boost::next(prev, 2);</pre>
</blockquote>
<p>The distance from the given iterator should be supplied as an absolute value. For
example, the iterator four iterators prior to the given iterator <code>p</code>
may be obtained by <code>prior(p, 4)</code>.</p>
<p>Contributed by <a href="http://www.boost.org/people/dave_abrahams.htm">Dave Abrahams</a>. Two-argument versions by Daniel Walker.</p>
<h2><a name="Class_noncopyable">Class noncopyable</a></h2>
<p>Class <strong>noncopyable</strong> is a base class.&nbsp; Derive your own class
from <strong>noncopyable</strong> when you want to prohibit copy construction
and copy assignment.</p>
<p>Some objects, particularly those which hold complex resources like files or
network connections, have no sensible copy semantics.&nbsp; Sometimes there are
possible copy semantics, but these would be of very limited usefulness and be
very difficult to implement correctly.&nbsp; Sometimes you're implementing a
class that doesn't need to be copied just yet and you don't want to take the
time to write the appropriate functions.&nbsp; Deriving from <b>noncopyable</b>
will prevent the otherwise implicitly-generated functions (which don't have the
proper semantics) from becoming a trap for other programmers.</p>
<p>The traditional way to deal with these is to declare a private copy constructor
and copy assignment, and then document why this is done.&nbsp; But deriving
from <b>noncopyable</b> is simpler and clearer, and doesn't require additional
documentation.</p>
<p>The program <a href="noncopyable_test.cpp">noncopyable_test.cpp</a> can be used
to verify class <b>noncopyable</b> works as expected. It has have been run
successfully under GCC 2.95, Metrowerks CodeWarrior 5.0, and Microsoft Visual
C++ 6.0 sp 3.</p>
<p>Contributed by <a href="http://www.boost.org/people/dave_abrahams.htm">Dave Abrahams</a>.</p>
<h3>Example</h3>
<blockquote>
<pre>// inside one of your own headers ...
#include &lt;boost/utility.hpp&gt;
class ResourceLadenFileSystem : noncopyable {
class ResourceLadenFileSystem : boost::noncopyable {
...</pre>
</blockquote>
</blockquote>
<h3>Rationale</h3>
<p>Class noncopyable has protected constructor and destructor members to emphasize
that it is to be used only as a base class.&nbsp; Dave Abrahams notes concern
about the effect on compiler optimization of adding (even trivial inline)
destructor declarations. He says &quot;Probably this concern is misplaced,
because noncopyable will be used mostly for classes which own resources and
thus have non-trivial destruction semantics.&quot;</p>
<h2><a name="addressof">Function template addressof()</a></h2>
<p>Function <strong>addressof()</strong> returns the address of an object.</p>
<blockquote>
<pre>template &lt;typename T&gt; inline T* addressof(T& v);
template &lt;typename T&gt; inline const T* addressof(const T& v);
template &lt;typename T&gt; inline volatile T* addressof(volatile T& v);
template &lt;typename T&gt; inline const volatile T* addressof(const volatile T& v);
</pre>
</blockquote>
<p>C++ allows programmers to replace the unary <strong>operator&()</strong> class
member used to get the address of an object. Getting the real address of an
object requires ugly casting tricks to avoid invoking the overloaded <strong>operator&()</strong>.
Function <strong>addressof()</strong> provides a wrapper around the necessary
code to make it easy to get an object's real address.
</p>
<p>The program <a href="addressof_test.cpp">addressof_test.cpp</a> can be used to
verify that <b>addressof()</b> works as expected.</p>
<p>Contributed by Brad King based on ideas from discussion with Doug Gregor.</p>
<h3>Example</h3>
<blockquote>
<pre>#include &lt;boost/utility.hpp&gt;
<h3>Rationale</h3>
<p>Class noncopyable has protected constructor and destructor members to
emphasize that it is to be used only as a base class.&nbsp; Dave Abrahams notes
concern about the effect on compiler optimization of adding (even trivial inline)
destructor declarations. He says &quot;Probably this concern is misplaced, because
noncopyable will be used mostly for classes which own resources and thus have non-trivial destruction semantics.&quot;</p>
<hr>
<p>Revised&nbsp; <!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan
-->28 September, 2000<!--webbot bot="Timestamp" endspan i-checksum="39343"
struct useless_type {};
class nonaddressable {
useless_type operator&() const;
};
void f() {
nonaddressable x;
nonaddressable* xp = boost::addressof(x);
// nonaddressable* xpe = &amp;x; /* error */
}</pre>
</blockquote>
<h2><a name="result_of">Class template
result_of</a></h2> <p>The class template
<code>result_of</code> helps determine the type of a
call expression. Given an lvalue <code>f</code> of
type <code>F</code> and lvalues <code>t1</code>,
<code>t2</code>, ..., <code>t<em>N</em></code> of
types <code>T1</code>, <code>T2</code>, ...,
<code>T<em>N</em></code>, respectively, the type
<code>result_of&lt;F(T1, T2, ...,
T<em>N</em>)&gt;::type</code> defines the result type
of the expression <code>f(t1, t2,
...,t<em>N</em>)</code>. The implementation permits
the type <code>F</code> to be a function pointer,
function reference, member function pointer, or class
type.</p> <p>If your compiler does not support
<code>decltype</code>, then when <code>F</code> is a
class type with a member type <code>result_type</code>,
<code>result_of&lt;F(T1, T2, ...,
T<em>N</em>)&gt;</code> is
<code>F::result_type</code>. When <code>F</code>
does not contain <code>result_type</code>,
<code>result_of&lt;F(T1, T2, ...,
T<em>N</em>)&gt;</code> is <code>F::result&lt;F(T1,
T2, ..., T<em>N</em>)&gt;::type</code> when
<code><em>N</em> &gt; 0</code> or <code>void</code>
when <code><em>N</em> = 0</code>. For additional
information about <code>result_of</code>, see the
C++ Library Technical Report, <a
href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1836.pdf">N1836</a>,
or, for motivation and design rationale, the <code>result_of</code> <a
href="http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2003/n1454.html">proposal</a>.</p>
<p>Class template <code>result_of</code> resides in
the header <code>&lt;<a
href="../../boost/utility/result_of.hpp">boost/utility/result_of.hpp</a>&gt;</code>. By
default, <em>N</em> may be any value between 0 and
10. To change the upper limit, define the macro
<code>BOOST_RESULT_OF_NUM_ARGS</code> to the maximum
value for <em>N</em>.</p>
<a name="BOOST_NO_RESULT_OF"></a>
<p>This implementation of <code>result_of</code> requires class template partial specialization, the ability to parse function types properly, and support for SFINAE. If <code>result_of</code> is not supported by your compiler, including the header <code>boost/utility/result_of.hpp</code> will define the macro <code>BOOST_NO_RESULT_OF</code>. Contributed by Doug Gregor.</p>
<h2>Class templates for the Base-from-Member Idiom</h2>
<p>See <a href="base_from_member.html">separate documentation</a>.</p>
<hr>
<p>Revised&nbsp; <!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan
-->07 November, 2007<!--webbot bot="Timestamp" endspan i-checksum="39369"
-->
</p>
<p><EFBFBD> Copyright boost.org 1999. Permission to copy, use, modify, sell and
distribute this document is granted provided this copyright notice appears in
all copies. This document is provided &quot;as is&quot; without express or
implied warranty, and with no claim as to its suitability for any purpose.</p>
</body>
</html>
</p>
<p>&copy; Copyright Beman Dawes 1999-2003.</p>
<p>Distributed under the Boost Software License, Version 1.0. See
<a href="http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a></p>
</body>
</html>

393
value_init.htm Normal file
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@ -0,0 +1,393 @@
<html>
<head>
<meta http-equiv="Content-Type"
content="text/html; charset=iso-8859-1">
<title>value_initialized</title>
</head>
<body vlink="#800080" link="#0000ff" text="#000000" bgcolor="#ffffff">
<h2><img src="../../boost.png" width="276" height="86">
Header &lt;<a href="../../boost/utility/value_init.hpp">boost/utility/value_init.hpp</a>&gt;
</h2>
<h2>Contents</h2>
<dl>
<dt><a href="#rationale">Rationale</a></dt>
<dt><a href="#intro">Introduction</a></dt>
<dt><a href="#details">Details</a></dt>
</dl>
<ul>
<li><a href="#valueinit">value-initialization</a></li>
<li><a href="#valueinitsyn">value-initialization syntax</a></li>
<li><a href="#compiler_issues">compiler issues</a></li>
</ul>
<dl class="page-index">
<dt><a href="#types">Types and objects</a></dt>
</dl>
<ul>
<li><a href="#val_init"><code>template class value_initialized&lt;T&gt;</code></a></li>
<li><a href="#initialized_value"><code>initialized_value</code></a></li>
</ul>
<a href="#acknowledgements">Acknowledgements</a><br>
<br>
<hr>
<h2><a name="rationale"></a>Rationale</h2>
<p>Constructing and initializing objects in a generic way is difficult in
C++. The problem is that there are several different rules that apply
for initialization. Depending on the type, the value of a newly constructed
object can be zero-initialized (logically 0), default-constructed (using
the default constructor), or indeterminate. When writing generic code,
this problem must be addressed. The template <code>value_initialized</code> provides
a solution with consistent syntax for value initialization of scalar,
union and class types.
Moreover, <code>value_initialized</code> offers a workaround to various
compiler issues regarding value-initialization.
Furthermore, a <code>const</code> object, <code>initialized_value</code> is provided,
to avoid repeating the type name when retrieving the value from a
<code>value_initialized&lt;T&gt;</code> object.
<br>
</p>
<h2><a name="intro"></a>Introduction</h2>
<p>
There are various ways to initialize a variable, in C++. The following
declarations all <em>may</em> have a local variable initialized to its default
value:
<pre>
T1 var1;
T2 var2 = 0;
T3 var3 = {};
T4 var4 = T4();
</pre>
Unfortunately, whether or not any of those declarations correctly
initialize the variable very much depends on its type. The first
declaration is valid for any <a href="http://www.sgi.com/tech/stl/DefaultConstructible.html">
DefaultConstructible</a> type (by definition).
However, it does not always do an initialization!
It correctly initializes the variable when it's an instance of a
class, and the author of the class has provided a proper default
constructor. On the other hand, the value of <code>var1</code> is <em>indeterminate</em> when
its type is an arithmetic type, like <code>int</code>, <code>float</code>, or <code>char</code>.
An arithmetic variable
is of course initialized properly by the second declaration, <code>T2
var2 = 0</code>. But this initialization form usually won't work for a
class type (unless the class was especially written to support being
initialized that way). The third form, <code>T3 var3 = {}</code>
initializes an aggregate, typically a "C-style" <code>struct</code> or a "C-style" array.
However, the syntax is not allowed for a class that has an explicitly declared
constructor. (But watch out for an upcoming C++ language change,
by Bjarne Stroustrup et al [<a href="#references">1</a>]!)
The fourth form is the most generic form of them, as it
can be used to initialize arithmetic types, class types, aggregates, pointers, and
other types. The declaration, <code>T4 var4 = T4()</code>, should be read
as follows: First a temporary object is created, by <code>T4()</code>.
This object is <a href="#valueinit">value-initialized</a>. Next the temporary
object is copied to the named variable, <code>var4</code>. Afterwards, the temporary
is destroyed. While the copying and the destruction are likely to
be optimized away, C++ still requires the type <code>T4</code> to be
<a href="CopyConstructible.html">CopyConstructible</a>.
(So <code>T4</code> needs to be <em>both</em> DefaultConstructible <em>and</em> CopyConstructible.)
A class may not be CopyConstructible, for example because it may have a
private and undefined copy constructor,
or because it may be derived from <a href="utility.htm#Class_noncopyable">boost::noncopyable</a>.
Scott Meyers [<a href="#references">2</a>] explains why a class would be defined like that.
</p>
<p>
There is another, less obvious disadvantage to the fourth form, <code>T4 var4 = T4()</code>:
It suffers from various <a href="#compiler_issues">compiler issues</a>, causing
a variable to be left uninitialized in some compiler specific cases.
</p>
<p>
The template <a href="#val_init"><code>value_initialized</code></a>
offers a generic way to initialize
an object, like <code>T4 var4 = T4()</code>, but without requiring its type
to be CopyConstructible. And it offers a workaround to those compiler issues
regarding value-initialization as well! It allows getting an initialized
variable of any type; it <em>only</em> requires the type to be DefaultConstructible.
A properly <em>value-initialized</em> object of type <code>T</code> is
constructed by the following declaration:
<pre>
value_initialized&lt;T&gt; var;
</pre>
</p>
<p>
The <code>const</code> object <a href="#initialized_value"><code>initialized_value</code></a>
allows value-initializing a variable as follows:
<pre>
T var = initialized_value ;
</pre>
This form of initialization is semantically equivalent to <code>T4 var4 = T4()</code>,
but robust against the aforementioned compiler issues.
</p>
<h2><a name="details"></a>Details</h2>
<p>The C++ standard [<a href="#references">3</a>] contains the definitions
of <code>zero-initialization</code> and <code>default-initialization</code>.
Informally, zero-initialization means that the object is given the initial
value 0 (converted to the type) and default-initialization means that
POD [<a href="#references">4</a>] types are zero-initialized, while non-POD class
types are initialized with their corresponding default constructors. A
<i>declaration</i> can contain an <i>initializer</i>, which specifies the
object's initial value. The initializer can be just '()', which states that
the object shall be value-initialized (but see below). However, if a <i>declaration</i>
has no <i>initializer</i> and it is of a non-<code>const</code>, non-<code>static</code>
POD type, the initial value is indeterminate: <cite>(see &sect;8.5, [dcl.init], for the
accurate definitions).</cite></p>
<pre>int x ; // no initializer. x value is indeterminate.<br>std::string s ; // no initializer, s is default-constructed.<br><br>int y = int() ; <br>// y is initialized using copy-initialization<br>// but the temporary uses an empty set of parentheses as the initializer,<br>// so it is default-constructed.<br>// A default constructed POD type is zero-initialized,<br>// therefore, y == 0.<br><br>void foo ( std::string ) ;<br>foo ( std::string() ) ; <br>// the temporary string is default constructed <br>// as indicated by the initializer () </pre>
<h3><a name="valueinit">value-initialization</a></h3>
<p>The first <a
href="http://anubis.dkuug.dk/JTC1/SC22/WG21/docs/cwg_defects.html">Technical
Corrigendum for the C++ Standard</a> (TC1), whose draft was released to
the public in November 2001, introduced <a
href="http://anubis.dkuug.dk/JTC1/SC22/WG21/docs/cwg_defects.html#178">Core
Issue 178</a> (among many other issues, of course).</p>
<p> That issue introduced the new concept of <code>value-initialization</code>
(it also fixed the wording for zero-initialization). Informally, value-initialization
is similar to default-initialization with the exception that in some cases
non-static data members and base class sub-objects are also value-initialized.
The difference is that an object that is value-initialized won't have
(or at least is less likely to have) indeterminate values for data members
and base class sub-objects; unlike the case of an object default constructed.
(see Core Issue 178 for a normative description).</p>
<p>In order to specify value-initialization of an object we need to use the
empty-set initializer: (). </p>
<p>As before, a declaration with no intializer specifies default-initialization,
and a declaration with a non-empty initializer specifies copy (=xxx) or
direct (xxx) initialization. </p>
<pre>template&lt;class T&gt; void eat(T);<br>int x ; // indeterminate initial value.<br>std::string s; // default-initialized.<br>eat ( int() ) ; // value-initialized<br>eat ( std::string() ) ; // value-initialized</pre>
<h4><a name="valueinitsyn">value-initialization</a> syntax</h4>
<p>Value initialization is specified using (). However, the empty set of
parentheses is not permitted by the syntax of initializers because it is
parsed as the declaration of a function taking no arguments: </p>
<pre>int x() ; // declares function int(*)()</pre>
<p>Thus, the empty () must be put in some other initialization context.</p>
<p>One alternative is to use copy-initialization syntax:</p>
<pre>int x = int() ;</pre>
<p>This works perfectly fine for POD types. But for non-POD class types,
copy-initialization searches for a suitable constructor, which could be,
for instance, the copy-constructor (it also searches for a suitable conversion
sequence but this doesn't apply in this context). For an arbitrary unknown
type, using this syntax may not have the value-initialization effect intended
because we don't know if a copy from a default constructed object is exactly
the same as a default constructed object, and the compiler is allowed (in
some cases), but never required to, optimize the copy away.</p>
<p>One possible generic solution is to use value-initialization of a non static
data member:</p>
<pre>template&lt;class T&gt; <br>struct W <br>{<br> // value-initialization of 'data' here.<br> W() : data() {}<br> T data ;<br>} ;<br>W&lt;int&gt; w ;<br>// w.data is value-initialized for any type. </pre>
<p>This is the solution as it was supplied by earlier versions of the
<code>value_initialized&lt;T&gt;</code> template
class. Unfortunately this approach suffered from various compiler issues.</p>
<h4><a name="compiler_issues">compiler issues</a> </h4>
Various compilers haven't yet fully implemented value-initialization.
So when an object should be <em>value-initialized</em> (according to the C++ Standard),
it <em>may</em> in practice still be left uninitialized, because of those
compiler issues! It's hard to make a general statement on what those issues
are like, because they depend on the compiler you are using, its version number,
and the type of object you would like to have value-initialized.
Compilers usually support value-initialization for built-in types properly.
But objects of user-defined types that involve <em>aggregates</em> may <em>in some cases</em>
be partially, or even entirely left uninitialized, when they should be value-initialized.
</p>
<p>
We have encountered issues regarding value-initialization on compilers by
Microsoft, Sun, Borland, and GNU. Here is a list of bug reports on those issues:
<table summary="Compiler bug reports regarding value-initialization" border="0" cellpadding="7" cellspacing="1" >
<tr><td>
<a href="https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=100744">
Microsoft Feedback ID 100744 - Value-initialization in new-expression</a>
<br>Reported by Pavel Kuznetsov (MetaCommunications Engineering), 2005-07-28
<br>
<a href="http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30111">
GCC Bug 30111 - Value-initialization of POD base class doesn't initialize members</a>
<br>Reported by Jonathan Wakely, 2006-12-07
<br>
<a href="http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33916">
GCC Bug 33916 - Default constructor fails to initialize array members</a>
<br>Reported by Michael Elizabeth Chastain, 2007-10-26
<br>
<a href="http://qc.codegear.com/wc/qcmain.aspx?d=51854">
Borland Report 51854 - Value-initialization: POD struct should be zero-initialized</a>
<br>Reported by Niels Dekker (LKEB, Leiden University Medical Center), 2007-09-11
<br>
</td></tr></table>
</p><p>
New versions of <code>value_initialized</code>
(Boost release version 1.35 or higher)
offer a workaround to these issues: <code>value_initialized</code> will now clear
its internal data, prior to constructing the object that it contains.
</p>
<h2><a name="types"></a>Types and objects</h2>
<h2><a name="val_init"><code>template class value_initialized&lt;T&gt;</code></a></h2>
<pre>namespace boost {<br><br>template&lt;class T&gt;<br>class value_initialized<br>{<br> public :<br> value_initialized() : x() {}<br> operator T&amp;() const { return x ; }<br> T&amp; data() const { return x ; }<br><br> private :<br> <i>unspecified</i> x ;<br>} ;<br><br>template&lt;class T&gt;<br>T const&amp; get ( value_initialized&lt;T&gt; const&amp; x )<br>{<br> return x.data() ;<br>}<br><br>template&lt;class T&gt;<br>T&amp; get ( value_initialized&lt;T&gt;&amp; x )<br>{<br> return x.data() ;<br>}<br><br>} // namespace boost<br></pre>
<p>An object of this template class is a <code>T</code>-wrapper convertible
to <code>'T&amp;'</code> whose wrapped object (data member of type <code>T</code>)
is <a href="#valueinit">value-initialized</a> upon default-initialization
of this wrapper class: </p>
<pre>int zero = 0 ;<br>value_initialized&lt;int&gt; x ;<br>assert ( x == zero ) ;<br><br>std::string def ;<br>value_initialized&lt; std::string &gt; y ;<br>assert ( y == def ) ;<br></pre>
<p>The purpose of this wrapper is to provide a consistent syntax for value
initialization of scalar, union and class types (POD and non-POD) since
the correct syntax for value initialization varies (see <a
href="#valueinitsyn">value-initialization syntax</a>)</p>
<p>The wrapped object can be accessed either through the conversion operator
<code>T&amp;</code>, the member function <code>data()</code>, or the
non-member function <code>get()</code>: </p>
<pre>void watch(int);<br>value_initialized&lt;int&gt; x;<br><br>watch(x) ; // operator T&amp; used.<br>watch(x.data());<br>watch( get(x) ) // function get() used</pre>
<p>Both <code>const</code> and non-<code>const</code> objects can be wrapped.
Mutable objects can be modified directly from within the wrapper but constant
objects cannot:</p>
<pre>value_initialized&lt;int&gt; x ; <br>static_cast&lt;int&amp;&gt;(x) = 1 ; // OK<br>get(x) = 1 ; // OK<br><br>value_initialized&lt;int const&gt; y ; <br>static_cast&lt;int&amp;&gt;(y) = 1 ; // ERROR: cannot cast to int&amp;<br>static_cast&lt;int const&amp;&gt;(y) = 1 ; // ERROR: cannot modify a const value<br>get(y) = 1 ; // ERROR: cannot modify a const value</pre>
<h3>Warning:</h3>
<p>Both the conversion operator and the <code>data()</code> member function
are <code>const</code> in order to allow access to the wrapped object
from a constant wrapper:</p>
<pre>void foo(int);<br>value_initialized&lt;int&gt; const x ;<br>foo(x);<br></pre>
<p>But notice that this conversion operator is to <code>T&amp;</code> although
it is itself <code>const</code>. As a consequence, if <code>T</code> is
a non-<code>const</code> type, you can modify the wrapped object even from
within a constant wrapper:</p>
<pre>value_initialized&lt;int&gt; const x_c ;<br>int&amp; xr = x_c ; // OK, conversion to int&amp; available even though x_c is itself const.<br>xr = 2 ; </pre>
<p>The reason for this obscure behavior is that some commonly used compilers
just don't accept the following valid code:</p>
<pre>struct X<br>{<br> operator int&amp;() ;<br> operator int const&amp;() const ; <br>};<br>X x ;<br>(x == 1 ) ; // ERROR HERE!</pre>
<p>These compilers complain about ambiguity between the conversion operators.
This complaint is incorrect, but the only workaround that I know of is
to provide only one of them, which leads to the obscure behavior just explained.<br>
</p>
<h3>Recommended practice: The non-member get() idiom</h3>
<p>The obscure behavior of being able to modify a non-<code>const</code>
wrapped object from within a constant wrapper can be avoided if access to
the wrapped object is always performed with the <code>get()</code> idiom:</p>
<pre>value_initialized&lt;int&gt; x ;<br>get(x) = 1 ; // OK<br><br>value_initialized&lt;int const&gt; cx ;<br>get(x) = 1 ; // ERROR: Cannot modify a const object<br><br>value_initialized&lt;int&gt; const x_c ;<br>get(x_c) = 1 ; // ERROR: Cannot modify a const object<br><br>value_initialized&lt;int const&gt; const cx_c ;<br>get(cx_c) = 1 ; // ERROR: Cannot modify a const object<br></pre>
<h2><a name="initialized_value"><code>initialized_value</code></a></h2>
<pre>
namespace boost {
class initialized_value_t
{
public :
template &lt;class T&gt; operator T() const ;
};
initialized_value_t const initialized_value = {} ;
} // namespace boost
</pre>
<code>initialized_value</code> provides a convenient way to get
an initialized value: its conversion operator provides an appropriate
<em>value-initialized</em> object for any CopyConstructible type.
Suppose you need to have an initialized variable of type <code>T</code>.
You could do it as follows:
<pre>
T var = T();
</pre>
But as mentioned before, this form suffers from various compiler issues.
The template <code>value_initialized</code> offers a workaround:
<pre>
T var = get( value_initialized&lt;T&gt;() );
</pre>
Unfortunately both forms repeat the type name, which
is rather short now (<code>T</code>), but could of course be
more like <code>Namespace::Template&lt;Arg&gt;::Type</code>.
Instead, one could use <code>initialized_value</code> as follows:
<pre>
T var = initialized_value ;
</pre>
<h3><a name="references">References</a></h3>
[1] Bjarne Stroustrup, Gabriel Dos Reis, and J. Stephen Adamczyk wrote
various papers, proposing to extend the support for brace-enclosed <em>initializer lists</em>
in the next version of C++.
This would allow a variable <code>var</code> of any DefaultConstructible type
<code>T</code> to be <em>value-initialized</em> by doing <code>T var = {}</code>.
The papers are listed at Bjarne's web page,
<a href="http://www.research.att.com/~bs/WG21.html">My C++ Standards committee papers</a> <br>
[2] Scott Meyers, Effective C++, Third Edition, item 6,
<em>Explicitly disallow the use of compiler-generated functions you do not want</em>,
<a href="http://www.aristeia.com/books.html">Scott Meyers: Books and CDs</a> <br>
[3] The C++ Standard, Second edition (2003), ISO/IEC 14882:2003 <br>
[4] POD stands for "Plain Old Data"
<h3><a name="acknowledgements"></a>Acknowledgements</h3>
value_initialized was developed by Fernando Cacciola, with help and
suggestions from David Abrahams and Darin Adler.<br>
Special thanks to Bj&ouml;rn Karlsson who carefully edited and completed this documentation.
<p>value_initialized was reimplemented by Fernando Cacciola and Niels Dekker
for Boost release version 1.35 (2008), offering a workaround to various compiler issues.
</p>
<p>initialized_value was written by Niels Dekker, and added to Boost release version 1.36 (2008).
</p>
<p>Developed by <a href="mailto:fernando_cacciola@hotmail.com">Fernando Cacciola</a>,
the latest version of this file can be found at <a
href="http://www.boost.org">www.boost.org</a>.
</p>
<hr>
<p>Revised 23 May 2008</p>
<p>&copy; Copyright Fernando Cacciola, 2002, 2008.</p>
<p>Distributed under the Boost Software License, Version 1.0. See
<a href="http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a></p>
<br>
<br>
</body>
</html>

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// Copyright 2002-2008, Fernando Luis Cacciola Carballal.
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// Test program for "boost/utility/value_init.hpp"
//
// 21 Ago 2002 (Created) Fernando Cacciola
// 15 Jan 2008 (Added tests regarding compiler issues) Fernando Cacciola, Niels Dekker
// 23 May 2008 (Added tests regarding initialized_value) Niels Dekker
#include <cstring> // For memcmp.
#include <iostream>
#include <string>
#include "boost/utility/value_init.hpp"
#include <boost/shared_ptr.hpp>
#ifdef __BORLANDC__
#pragma hdrstop
#endif
#include "boost/test/minimal.hpp"
//
// Sample POD type
//
struct POD
{
POD () : c(0), i(0), f(0) {}
POD ( char c_, int i_, float f_ ) : c(c_), i(i_), f(f_) {}
friend std::ostream& operator << ( std::ostream& os, POD const& pod )
{ return os << '(' << pod.c << ',' << pod.i << ',' << pod.f << ')' ; }
friend bool operator == ( POD const& lhs, POD const& rhs )
{ return lhs.f == rhs.f && lhs.c == rhs.c && lhs.i == rhs.i ; }
float f;
char c;
int i;
} ;
//
// Sample non POD type
//
struct NonPODBase
{
virtual ~NonPODBase() {}
} ;
struct NonPOD : NonPODBase
{
NonPOD () : id() {}
explicit NonPOD ( std::string const& id_) : id(id_) {}
friend std::ostream& operator << ( std::ostream& os, NonPOD const& npod )
{ return os << '(' << npod.id << ')' ; }
friend bool operator == ( NonPOD const& lhs, NonPOD const& rhs )
{ return lhs.id == rhs.id ; }
std::string id ;
} ;
//
// Sample aggregate POD struct type
// Some compilers do not correctly value-initialize such a struct, for example:
// Borland C++ Report #51854, "Value-initialization: POD struct should be zero-initialized "
// http://qc.codegear.com/wc/qcmain.aspx?d=51854
//
struct AggregatePODStruct
{
float f;
char c;
int i;
};
bool operator == ( AggregatePODStruct const& lhs, AggregatePODStruct const& rhs )
{ return lhs.f == rhs.f && lhs.c == rhs.c && lhs.i == rhs.i ; }
//
// An aggregate struct that contains an std::string and an int.
// Pavel Kuznetsov (MetaCommunications Engineering) used a struct like
// this to reproduce the Microsoft Visual C++ compiler bug, reported as
// Feedback ID 100744, "Value-initialization in new-expression"
// https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=100744
//
struct StringAndInt
{
std::string s;
int i;
};
bool operator == ( StringAndInt const& lhs, StringAndInt const& rhs )
{ return lhs.s == rhs.s && lhs.i == rhs.i ; }
//
// A struct that has an explicit (user defined) destructor.
// Some compilers do not correctly value-initialize such a struct, for example:
// Microsoft Visual C++, Feedback ID 100744, "Value-initialization in new-expression"
// https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=100744
//
struct StructWithDestructor
{
int i;
~StructWithDestructor() {}
};
bool operator == ( StructWithDestructor const& lhs, StructWithDestructor const& rhs )
{ return lhs.i == rhs.i ; }
//
// A struct that has a virtual function.
// Some compilers do not correctly value-initialize such a struct either, for example:
// Microsoft Visual C++, Feedback ID 100744, "Value-initialization in new-expression"
// https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=100744
//
struct StructWithVirtualFunction
{
int i;
virtual void VirtualFunction();
};
void StructWithVirtualFunction::VirtualFunction()
{
}
bool operator == ( StructWithVirtualFunction const& lhs, StructWithVirtualFunction const& rhs )
{ return lhs.i == rhs.i ; }
//
// A struct that is derived from an aggregate POD struct.
// Some compilers do not correctly value-initialize such a struct, for example:
// GCC Bugzilla Bug 30111, "Value-initialization of POD base class doesn't initialize members",
// reported by Jonathan Wakely, http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30111
//
struct DerivedFromAggregatePODStruct : AggregatePODStruct
{
DerivedFromAggregatePODStruct() : AggregatePODStruct() {}
};
//
// A struct that wraps an aggregate POD struct as data member.
//
struct AggregatePODStructWrapper
{
AggregatePODStructWrapper() : dataMember() {}
AggregatePODStruct dataMember;
};
bool operator == ( AggregatePODStructWrapper const& lhs, AggregatePODStructWrapper const& rhs )
{ return lhs.dataMember == rhs.dataMember ; }
typedef unsigned char ArrayOfBytes[256];
//
// A struct that allows testing whether the appropriate copy functions are called.
//
struct CopyFunctionCallTester
{
bool is_copy_constructed;
bool is_assignment_called;
CopyFunctionCallTester()
: is_copy_constructed(false), is_assignment_called(false) {}
CopyFunctionCallTester(const CopyFunctionCallTester & )
: is_copy_constructed(true), is_assignment_called(false) {}
CopyFunctionCallTester & operator=(const CopyFunctionCallTester & )
{
is_assignment_called = true ;
return *this ;
}
};
template<class T>
void check_initialized_value ( T const& y )
{
T initializedValue = boost::initialized_value ;
BOOST_CHECK ( y == initializedValue ) ;
}
#ifdef __BORLANDC__
#if __BORLANDC__ == 0x582
void check_initialized_value( NonPOD const& )
{
// The initialized_value check is skipped for Borland 5.82
// and this type (NonPOD), because the following statement
// won't compile on this particular compiler version:
// NonPOD initializedValue = boost::initialized_value() ;
//
// This is caused by a compiler bug, that is fixed with a newer version
// of the Borland compiler. The Release Notes for Delphi(R) 2007 for
// Win32(R) and C++Builder(R) 2007 (http://dn.codegear.com/article/36575)
// say about similar statements:
// both of these statements now compile but under 5.82 got the error:
// Error E2015: Ambiguity between 'V::V(const A &)' and 'V::V(const V &)'
}
#endif
#endif
//
// This test function tests boost::value_initialized<T> for a specific type T.
// The first argument (y) is assumed have the value of a value-initialized object.
// Returns true on success.
//
template<class T>
bool test ( T const& y, T const& z )
{
const boost::unit_test::counter_t counter_before_test = boost::minimal_test::errors_counter();
check_initialized_value(y);
boost::value_initialized<T> x ;
BOOST_CHECK ( y == x ) ;
BOOST_CHECK ( y == boost::get(x) ) ;
static_cast<T&>(x) = z ;
boost::get(x) = z ;
BOOST_CHECK ( x == z ) ;
boost::value_initialized<T> const x_c ;
BOOST_CHECK ( y == x_c ) ;
BOOST_CHECK ( y == boost::get(x_c) ) ;
T& x_c_ref = x_c ;
x_c_ref = z ;
BOOST_CHECK ( x_c == z ) ;
boost::value_initialized<T> const copy1 = x;
BOOST_CHECK ( boost::get(copy1) == boost::get(x) ) ;
boost::value_initialized<T> copy2;
copy2 = x;
BOOST_CHECK ( boost::get(copy2) == boost::get(x) ) ;
boost::shared_ptr<boost::value_initialized<T> > ptr( new boost::value_initialized<T> );
BOOST_CHECK ( y == *ptr ) ;
#if !BOOST_WORKAROUND(BOOST_MSVC, < 1300)
boost::value_initialized<T const> cx ;
BOOST_CHECK ( y == cx ) ;
BOOST_CHECK ( y == boost::get(cx) ) ;
boost::value_initialized<T const> const cx_c ;
BOOST_CHECK ( y == cx_c ) ;
BOOST_CHECK ( y == boost::get(cx_c) ) ;
#endif
return boost::minimal_test::errors_counter() == counter_before_test ;
}
int test_main(int, char **)
{
BOOST_CHECK ( test( 0,1234 ) ) ;
BOOST_CHECK ( test( 0.0,12.34 ) ) ;
BOOST_CHECK ( test( POD(0,0,0.0), POD('a',1234,56.78) ) ) ;
BOOST_CHECK ( test( NonPOD( std::string() ), NonPOD( std::string("something") ) ) ) ;
NonPOD NonPOD_object( std::string("NonPOD_object") );
BOOST_CHECK ( test<NonPOD *>( 0, &NonPOD_object ) ) ;
AggregatePODStruct zeroInitializedAggregatePODStruct = { 0.0f, '\0', 0 };
AggregatePODStruct nonZeroInitializedAggregatePODStruct = { 1.25f, 'a', -1 };
BOOST_CHECK ( test(zeroInitializedAggregatePODStruct, nonZeroInitializedAggregatePODStruct) );
StringAndInt stringAndInt0;
StringAndInt stringAndInt1;
stringAndInt0.i = 0;
stringAndInt1.i = 1;
stringAndInt1.s = std::string("1");
BOOST_CHECK ( test(stringAndInt0, stringAndInt1) );
StructWithDestructor structWithDestructor0;
StructWithDestructor structWithDestructor1;
structWithDestructor0.i = 0;
structWithDestructor1.i = 1;
BOOST_CHECK ( test(structWithDestructor0, structWithDestructor1) );
StructWithVirtualFunction structWithVirtualFunction0;
StructWithVirtualFunction structWithVirtualFunction1;
structWithVirtualFunction0.i = 0;
structWithVirtualFunction1.i = 1;
BOOST_CHECK ( test(structWithVirtualFunction0, structWithVirtualFunction1) );
DerivedFromAggregatePODStruct derivedFromAggregatePODStruct0;
DerivedFromAggregatePODStruct derivedFromAggregatePODStruct1;
static_cast<AggregatePODStruct &>(derivedFromAggregatePODStruct0) = zeroInitializedAggregatePODStruct;
static_cast<AggregatePODStruct &>(derivedFromAggregatePODStruct1) = nonZeroInitializedAggregatePODStruct;
BOOST_CHECK ( test(derivedFromAggregatePODStruct0, derivedFromAggregatePODStruct1) );
AggregatePODStructWrapper aggregatePODStructWrapper0;
AggregatePODStructWrapper aggregatePODStructWrapper1;
aggregatePODStructWrapper0.dataMember = zeroInitializedAggregatePODStruct;
aggregatePODStructWrapper1.dataMember = nonZeroInitializedAggregatePODStruct;
BOOST_CHECK ( test(aggregatePODStructWrapper0, aggregatePODStructWrapper1) );
ArrayOfBytes zeroInitializedArrayOfBytes = { 0 };
boost::value_initialized<ArrayOfBytes> valueInitializedArrayOfBytes;
BOOST_CHECK (std::memcmp(get(valueInitializedArrayOfBytes), zeroInitializedArrayOfBytes, sizeof(ArrayOfBytes)) == 0);
boost::value_initialized<ArrayOfBytes> valueInitializedArrayOfBytes2;
valueInitializedArrayOfBytes2 = valueInitializedArrayOfBytes;
BOOST_CHECK (std::memcmp(get(valueInitializedArrayOfBytes), get(valueInitializedArrayOfBytes2), sizeof(ArrayOfBytes)) == 0);
boost::value_initialized<CopyFunctionCallTester> copyFunctionCallTester1;
BOOST_CHECK ( ! get(copyFunctionCallTester1).is_copy_constructed);
BOOST_CHECK ( ! get(copyFunctionCallTester1).is_assignment_called);
boost::value_initialized<CopyFunctionCallTester> copyFunctionCallTester2 = boost::value_initialized<CopyFunctionCallTester>(copyFunctionCallTester1);
BOOST_CHECK ( get(copyFunctionCallTester2).is_copy_constructed);
BOOST_CHECK ( ! get(copyFunctionCallTester2).is_assignment_called);
boost::value_initialized<CopyFunctionCallTester> copyFunctionCallTester3;
copyFunctionCallTester3 = boost::value_initialized<CopyFunctionCallTester>(copyFunctionCallTester1);
BOOST_CHECK ( ! get(copyFunctionCallTester3).is_copy_constructed);
BOOST_CHECK ( get(copyFunctionCallTester3).is_assignment_called);
return 0;
}
unsigned int expected_failures = 0;

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// Copyright 2002, Fernando Luis Cacciola Carballal.
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// Test program for "boost/utility/value_init.hpp"
//
// Initial: 21 Agu 2002
#include <iostream>
#include <string>
#include "boost/utility/value_init.hpp"
#ifdef __BORLANDC__
#pragma hdrstop
#endif
#include "boost/test/minimal.hpp"
int test_main(int, char **)
{
boost::value_initialized<int> const x_c ;
get(x_c) = 1234 ; // this should produce an ERROR
return 0;
}
unsigned int expected_failures = 0;

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// Copyright 2002, Fernando Luis Cacciola Carballal.
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// Test program for "boost/utility/value_init.hpp"
//
// Initial: 21 Agu 2002
#include <iostream>
#include <string>
#include "boost/utility/value_init.hpp"
#ifdef __BORLANDC__
#pragma hdrstop
#endif
#include "boost/test/minimal.hpp"
int test_main(int, char **)
{
boost::value_initialized<int const> cx ;
get(cx) = 1234 ; // this should produce an ERROR
return 0;
}
unsigned int expected_failures = 0;

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// Copyright 2002, Fernando Luis Cacciola Carballal.
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// Test program for "boost/utility/value_init.hpp"
//
// Initial: 21 Agu 2002
#include <iostream>
#include <string>
#include "boost/utility/value_init.hpp"
#ifdef __BORLANDC__
#pragma hdrstop
#endif
#include "boost/test/minimal.hpp"
int test_main(int, char **)
{
boost::value_initialized<int const> const cx_c ;
get(cx_c) = 1234 ; // this should produce an ERROR
return 0;
}
unsigned int expected_failures = 0;

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//
// verify_test.cpp - a test for BOOST_VERIFY
//
// Copyright (c) 2002 Peter Dimov and Multi Media Ltd.
// Copyright (c) 2007 Peter Dimov
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
#include <boost/detail/lightweight_test.hpp>
#include <boost/assert.hpp>
int f( int & x )
{
return ++x;
}
void test_default()
{
int x = 1;
BOOST_VERIFY( 1 );
BOOST_VERIFY( x == 1 );
BOOST_VERIFY( ++x );
BOOST_VERIFY( f(x) );
BOOST_VERIFY( &x );
BOOST_TEST( x == 3 );
}
#define BOOST_DISABLE_ASSERTS
#include <boost/assert.hpp>
void test_disabled()
{
int x = 1;
BOOST_VERIFY( 1 );
BOOST_VERIFY( x == 1 );
BOOST_VERIFY( ++x );
BOOST_VERIFY( f(x) );
BOOST_VERIFY( &x );
BOOST_TEST( x == 3 );
BOOST_VERIFY( 0 );
BOOST_VERIFY( !x );
BOOST_VERIFY( x == 0 );
BOOST_VERIFY( !++x );
BOOST_VERIFY( !f(x) );
BOOST_TEST( x == 5 );
void * p = 0;
BOOST_VERIFY( p );
}
#undef BOOST_DISABLE_ASSERTS
#define BOOST_ENABLE_ASSERT_HANDLER
#include <boost/assert.hpp>
#include <boost/config.hpp>
#include <cstdio>
int handler_invoked = 0;
void boost::assertion_failed(char const * expr, char const * function, char const * file, long line)
{
#if !defined(BOOST_NO_STDC_NAMESPACE)
using std::printf;
#endif
printf("Expression: %s\nFunction: %s\nFile: %s\nLine: %ld\n\n", expr, function, file, line);
++handler_invoked;
}
struct X
{
static bool f()
{
BOOST_VERIFY( 0 );
return false;
}
};
void test_handler()
{
int x = 1;
BOOST_VERIFY( 1 );
BOOST_VERIFY( x == 1 );
BOOST_VERIFY( ++x );
BOOST_VERIFY( f(x) );
BOOST_VERIFY( &x );
BOOST_TEST( x == 3 );
BOOST_VERIFY( 0 );
BOOST_VERIFY( !x );
BOOST_VERIFY( x == 0 );
BOOST_VERIFY( !++x );
BOOST_VERIFY( !f(x) );
BOOST_TEST( x == 5 );
void * p = 0;
BOOST_VERIFY( p );
BOOST_VERIFY( X::f() );
BOOST_TEST( handler_invoked == 8 );
}
#undef BOOST_ENABLE_ASSERT_HANDLER
int main()
{
test_default();
test_disabled();
test_handler();
return boost::report_errors();
}