1 reno_project 2 reno_config 0 ../../.. 1 0 .*\.(cpp|hpp|h)$ /\*(?:[^\*]|\*[^/])*\*/|//[^\r\n]*|"(?:[^"\\]|\\.)*"|'(?:[^'\\]|\\.)*'|((?:(?:(?:[^\r\n\{\}"'/]|/\*(?:[^\*]|\*[^/])*\*/|//[^\r\n]*|"(?:[^"\\]|\\.)*"|'(?:[^'\\]|\\.)*')+\r?\n)+(?!\r?\n))?[ \t]*\{[ \t]*)|\}[;\t ]*(?:\r?\n)?() 3 reno_layer_map 9 default 4 reno_layer 36 0 5 reno_context 1 D9B8E6AA12A4F33953B1A961FA590C5A3840234B6531CA8C04AC985AD5800835 2432554768 702 408 0 ../example/enable_error_info.cpp 0 0 <string>Tutorial: Integrating Boost Exception in Existing Exception Class Hierarchies</string> using_enable_error_info 1 2 (:include include:) !!!See also: (:pagelist link="backlink" except_tags="noalso":) 0 6 reno_context 1 AEB5EEC1A44A4F0B184A6F73617CB57E82CE06A15DB6036D54109C66CDE06EFF 625364235 290 302 0 ../example/logging.cpp 0 0 <string>Tutorial: Logging of boost::exception Objects</string> logging 1 2 (:include include:) !!!See also: (:pagelist link="backlink" except_tags="noalso":) 0 7 reno_context 2 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1 2 (:include include:) !!!See also: (:pagelist link="backlink" except_tags="noalso":) 0 13 reno_context 1 E64E4DFB1DC251F844260AE133EFD419677D0F7143D65B578DEE525492F6B624 2172131053 94 227 0 ../../../boost/exception.hpp 0 0 <string>boost/exception.hpp</string> exception_hpp 1 2 !!!boost/exception.hpp This header file includes all other header files of Boost Exception: (:pagelist tags="header":) 0 14 reno_context 1 40C2FBC8600FE6877A6D46EC005D97EB1F612B8687CCA297C838E10A80E089AA 2576029551 94 227 0 ../../../boost/exception_ptr.hpp 0 0 <string>boost/exception_ptr.hpp</string> exception_cloning_hpp 1 2 !!!boost/exception_ptr.hpp This header file contains the following definitions/declarations: (:pagelist link="backlink" layer="synopsis":) 0 15 reno_context 1 2C5F1B7E5C5052C9C9305848AB499A9C166D728EAAD25DC936B75FCA997A0650 3171555959 88 1 0 ../../../boost/throw_exception.hpp 0 0 <string>boost/throw_exception.hpp</string> throw_exception_hpp 1 2 !!!boost/exception/throw_exception.hpp This header file contains the following definitions/declarations: (:pagelist link="backlink" layer="synopsis":) 0 16 reno_context 1 A9C65F105342D728DE9C996079E82DF25408B94A272090039FAAC12D29659F69 2378831669 94 227 0 ../../../boost/exception/enable_current_exception.hpp 0 0 <string>boost/exception/enable_current_exception.hpp</string> exception_enable_exception_cloning_hpp 1 2 !!!boost/exception/enable_current_exception.hpp This header file contains the following definitions/declarations: (:pagelist link="backlink" layer="synopsis":) 0 17 reno_context 1 DFB8EFE8A4EE9FB101DC20A69A4217A96B78A272D7DE88D579CFE8ECCC070531 2228033283 94 227 0 ../../../boost/exception/enable_error_info.hpp 0 0 <string>boost/exception/enable_error_info.hpp</string> exception_enable_error_info_hpp 1 2 !!!boost/exception/enable_error_info.hpp This header file contains the following definitions/declarations: (:pagelist link="backlink" layer="synopsis":) 0 18 reno_context 1 CAD6C404CB725D336A44920D2341ECA131149AB02C368B59028F8147F16737BF 2258638601 94 227 0 ../../../boost/exception/info_tuple.hpp 0 0 <string>boost/exception/info_tuple.hpp</string> exception_error_info_group_hpp 1 2 !!!boost/exception/info_tuple.hpp This header file contains the following definitions/declarations: (:pagelist link="backlink" layer="synopsis":) 0 19 reno_context 1 EB524A8A61E5F1A93CE4336B980696C09E7ADF42A6B933BA76EFB1544AB7C4CC 2274957083 94 227 0 ../../../boost/exception/error_info.hpp 0 0 <string>boost/exception/error_info.hpp</string> exception_error_info_value_hpp 3 2 !!!boost/exception/error_info.hpp This header file contains the following declaration: [@namespace boost { template <class Tag, class T> class (:link 1 0 -8 2 :); }@] 0 20 reno_context 1 49D31376D97691F7C84A134B5D8C7C66EF1ED6901D376CA250D634AE2B38AB5E 549270010 163 572 0 ../../../boost/exception/info.hpp 0 0 <string>BOOST_ERROR_INFO</string> 1 2 (:include include:) !!!See also: (:pagelist link="backlink" except_tags="noalso":) 0 21 reno_context 2 5D3DFA90F5284E2BBF205D4BE191AD1949612D410554F40C20FDAE88EBE373DC 3654158033 4715 498 ED09F845070FF7D381BE5EFB6B55313FD09FBA16B64B69992410380EFA45519C 2051939590 78 363 0 ../../../boost/exception_ptr.hpp 0 0 <string>exception_ptr</string> 1 2 (:include include:) !!!See also: (:pagelist link="backlink" except_tags="noalso":) 0 22 reno_context 2 5D3DFA90F5284E2BBF205D4BE191AD1949612D410554F40C20FDAE88EBE373DC 3654158033 4715 498 921FBF6991E17349BFF2AD6F165372F85AA9457DDB28E502ABB6B392BBA6B529 3119269037 284 4306 0 ../../../boost/exception_ptr.hpp 0 0 <string>copy_exception</string> 1 2 (:include include:) !!!See also: (:pagelist link="backlink" except_tags="noalso":) 0 23 reno_context 2 0ABC82B04F3761C21F4588ABC9D5F82BAF3F293974F0ECE694303EFB59BA7376 3824507607 2762 516 8F3B5E1A267CA225679713F4DDF528041F573BC02D1DBCD8FFEF57EF0AA599B9 4197332561 180 2576 0 ../../../boost/exception/enable_current_exception.hpp 0 0 <string>enable_current_exception</string> 1 2 (:include include:) !!!See also: (:pagelist link="backlink" except_tags="noalso":) 0 24 reno_context 2 5D3DFA90F5284E2BBF205D4BE191AD1949612D410554F40C20FDAE88EBE373DC 3654158033 4715 498 9DEEF8ED70BF74F501A96BA5DE5BFD42FAD16DE333ABE189E512C332586FC465 2250569940 1893 2411 0 ../../../boost/exception_ptr.hpp 0 0 <string>current_exception</string> 1 2 (:include include:) !!!See also: (:pagelist link="backlink" except_tags="noalso":) 0 25 reno_context 1 5EE6ED209B5DBBD30DFCDA1FD30719A799EE9DBD48A5176F73EADB588CAEB2AA 2442598207 94 227 0 ../../../boost/exception/info.hpp 0 0 <string>boost/exception/info.hpp</string> exception_error_info_hpp 1 2 !!!boost/exception/info.hpp This header file contains the following definitions/declarations: (:pagelist link="backlink" layer="synopsis":) 0 26 reno_context 2 5D3DFA90F5284E2BBF205D4BE191AD1949612D410554F40C20FDAE88EBE373DC 3654158033 4715 498 7B6F48BAF7F452EDAEC5D09418936D96101CCA8700CD7469B9C7DA5DCA659E6A 3892925390 335 26 0 ../../../boost/exception_ptr.hpp 0 0 <string>unknown_exception</string> 1 2 (:include include:) !!!See also: (:pagelist link="backlink" except_tags="noalso":) 0 27 reno_context 0 1 <string>Boost Exception</string> boost-exception 113 2 !!Abstract The purpose of Boost Exception is to ease the design of exception class hierarchies and to help write exception handling and error reporting code. It supports transporting of arbitrary data to the catch site, which is otherwise tricky due to the no-throw requirements (15.5.1) for exception classes. Data can be added to any exception object, either directly in the throw-expression (15.1), or at a later time as the exception object propagates up the call stack. The ability to add data to exception objects after they have been passed to @@throw@@ is important, because often some of the information needed to handle an exception is unavailable in the context where the failure is detected. Boost Exception also supports (:link 1 0 28 reno_context 0 1 <string>Tutorial: Transporting of Exceptions between Threads</string> cloning 2 |cloning:) of exception objects, implemented non-intrusively and automatically by the @@boost::(:link 1 0 29 reno_context 2 BE8985294A55E37D9B677C21D50CF4EB5251827504230A4FE52FCB7702370F51 1124820874 329 864 02FC4C7F80E4704A722A49C8337614DB5DF60CA53B53AAD869CD7ECE2DCBE057 928857252 187 129 0 ../../../boost/throw_exception.hpp 0 0 <string>throw_exception</string> 2 :)()@@ function. !!!!Note: Boost Exception was accepted as a Boost library on November 7 2007, however it has not yet been part of an official Boost release. Current version can be downloaded from (:link http://svn.boost.org/svn/boost/trunk | Boost SVN:). !!Contents #Tutorial ##(:link 1 0 30 reno_context 0 1 <string>Tutorial: Transporting of Arbitrary Data to the Catch Site</string> transporting_data 2 :) ##(:link 1 0 -5 2 :) ##(:link 1 0 -28 2 :) ##(:link 1 0 -6 2 :) #Documentation ##Class @@(:link 1 0 -7 2 :)@@ ##Transporting of Arbitrary Data to the Catch Site ###@@(:link 1 0 -8 2 :)@@ ###@@(:link 1 0 -9 2 |operator<<:)()@@ ###@@(:link 1 0 -10 2 :)()@@ ###@@(:link 1 0 -11 2 :)()@@ ###@@(:link 1 0 -20 2 :)@@ ##Transporting of Exceptions between Threads ###@@(:link 1 0 -21 2 :)@@ ###@@(:link 1 0 -23 2 :)()@@ ###@@(:link 1 0 -24 2 :)()@@ ###@@(:link 1 0 -22 2 :)()@@ ###@@(:link 1 0 -12 2 :)()@@ ###@@(:link 1 0 -26 2 :)@@ ##@@(:link 1 0 -29 2 :)()@@ ##Headers ###@@(:link 1 0 -13 2 :)@@ ###@@(:link 1 0 -14 2 :)@@ ###@@(:link 1 0 -15 2 :)@@ ###@@(:link 1 0 -16 2 :)@@ ###@@(:link 1 0 -17 2 :)@@ ###@@(:link 1 0 -25 2 :)@@ ###@@(:link 1 0 -18 2 :)@@ ###@@(:link 1 0 -19 2 :)@@ ###@@(:link 1 0 31 reno_context 1 C9AFCA0931CB65AE31811E702FC48CB22348149B1D259CD9161D391FEC640FA8 2324436793 94 227 0 ../../../boost/exception/exception.hpp 0 0 <string>boost/exception/exception.hpp</string> exception_exception_hpp 2 :)@@ #(:link 1 0 32 reno_context 0 1 <string>Index</string> name_idx 2 :) !!Synopsis @@#include <(:link 1 0 -13 2 :)>@@ [@namespace boost { (:include 1 0 -7 2 decl:) (:include 1 0 -8 2 decl:) (:include 1 0 -9 2 decl:) (:include 1 0 -10 2 decl:) (:include 1 0 -11 2 decl:) (:include 1 0 -20 2 decl:) (:include 1 0 -21 2 decl:) (:include 1 0 -23 2 decl:) (:include 1 0 -24 2 decl:) (:include 1 0 -22 2 decl:) (:include 1 0 -12 2 decl:) (:include 1 0 -26 2 decl:) (:include 1 0 -29 2 decl:) }@] (:include 1 0 -7 2 :) !!Transporting of Arbitrary Data to the Catch Site (:include 1 0 -8 2 :) (:include 1 0 -9 2 :) (:include 1 0 -10 2 :) (:include 1 0 -11 2 :) (:include 1 0 -20 2 :) !!Transporting of Exceptions between Threads (:include 1 0 -21 2 :) (:include 1 0 -23 2 :) (:include 1 0 -24 2 :) (:include 1 0 -22 2 :) (:include 1 0 -12 2 :) (:include 1 0 -26 2 :) !!Throwing Exceptions (:include 1 0 -29 2 :) 0 -28 1 2 (:include include:) !!!See also: (:pagelist link="backlink" except_tags="noalso":) 0 -29 1 2 (:include include:) !!!See also: (:pagelist link="backlink" except_tags="noalso":) 0 -30 1 2 (:include include:) !!!See also: (:pagelist link="backlink" except_tags="noalso":) 0 -31 1 2 !!!boost/exception/exception.hpp This header file contains the following definitions/declarations: (:pagelist link="backlink" layer="synopsis":) 0 -32 1 2 !Index (:pagelist fmt="index" except_tags="noindex":) 0 33 reno_context 1 5373E336DC4892A41D31694BCA1146382FC3137819A04689CA1F9FFAF1CFAB3B 4050491732 466 307 0 ../example/cloning_1.cpp 0 0 <string>Tutorial: Using enable_current_exception() at the Time of the Throw</string> using_enable_cloning 1 2 (:include include:) !!!See also: (:pagelist link="backlink" except_tags="noalso":) 0 34 reno_context 1 187BFD2B78A0DD006717B5B06FFD465E2468F521C32A86FB793F7A68AB5417F3 4276724153 574 382 0 ../example/error_info_1.cpp 0 0 <string>Tutorial: Adding of Arbitrary Data at the Point of the Throw</string> adding_data_at_throw 1 2 (:include include:) !!!See also: (:pagelist link="backlink" except_tags="noalso":) 0 35 reno_context 2 4DA932D1993B771C5283379491E9425AAE1E6D132B21E074D08BAADF069A2B23 280314796 2045 434 88F7292786F7625A38638650D1EE2677F961CFA644FEAEC1B0315F6B8BE13128 3570030120 397 1642 0 ../../../boost/exception/exception.hpp 0 0 <string>exception::what</string> 1 2 (:include include:) !!!See also: (:pagelist link="backlink" except_tags="noalso":) 0 36 reno_context 0 1 <string>exception::exception</string> exception_constructors 1 2 (:include include:) !!!See also: (:pagelist link="backlink" except_tags="noalso":) 0 37 reno_context 2 4DA932D1993B771C5283379491E9425AAE1E6D132B21E074D08BAADF069A2B23 280314796 2045 434 17E691632123EB67BA67D590B49EB8094F462F5A10A66A1C5438E1867EF1478E 765399792 77 1563 0 ../../../boost/exception/exception.hpp 0 0 <string>exception::~exception</string> exception_destructor 1 2 (:include include:) !!!See also: (:pagelist link="backlink" except_tags="noalso":) 0 38 reno_context 1 E444EE9697EEADFDE0767E1D0242FC0E70D98E61FB1F0FFA099648DE509B82F3 94503238 773 374 0 ../example/info_tuple.cpp 0 0 <string>Tutorial: Adding Grouped Data to Exceptions</string> grouping_data 1 2 (:include include:) !!!See also: (:pagelist link="backlink" except_tags="noalso":) 0 39 reno_context 1 FC684D0DD5A9732B4130F2AB3DB6E0491D0F523E14B7FB738B2019EA2C7F8717 2229778754 631 319 0 ../example/cloning_2.cpp 0 0 <string>Tutorial: Cloning and Re-throwing an Exception</string> cloning_and_rethrowing 1 2 (:include include:) !!!See also: (:pagelist link="backlink" except_tags="noalso":) 0 40 reno_context 1 F4C951B28F7DE500973AA3DFAA99F2BADA6EDAFA2B406C30BEF3B7FBE6FD57D7 2263754923 982 306 0 ../example/error_info_2.cpp 0 0 <string>Tutorial: Adding of Arbitrary Data to Active Exception Objects</string> adding_data_later 1 2 (:include include:) !!!See also: (:pagelist link="backlink" except_tags="noalso":) headers 41 reno_layer 36 0 -5 0 0 -6 0 0 -7 0 0 -8 0 0 -9 0 0 -10 0 0 -11 0 0 -12 3 2 [@#include < 1 1 2 >@] 0 -13 0 0 -14 0 0 -15 0 0 -16 0 0 -17 0 0 -18 0 0 -19 0 0 -20 0 0 -21 3 2 [@#include < 1 1 2 >@] 0 -22 0 0 -23 3 2 [@#include <(:link 1 0 -16 2 :)> 0 -24 3 2 [@#include < 1 1 2 >@] 0 -25 0 0 -26 0 0 -27 0 0 -28 0 0 -29 0 0 -30 0 0 -31 0 0 -32 0 0 -33 0 0 -34 0 0 -35 0 0 -36 0 0 -37 0 0 -38 0 0 -39 0 0 -40 0 ctors 42 reno_layer 36 0 -5 0 0 -6 0 0 -7 0 0 -8 0 0 -9 0 0 -10 0 0 -11 0 0 -12 0 0 -13 0 0 -14 0 0 -15 0 0 -16 0 0 -17 0 0 -18 0 0 -19 0 0 -20 0 0 -21 0 0 -22 0 0 -23 0 0 -24 0 0 -25 0 0 -26 0 0 -27 0 0 -28 0 0 -29 0 0 -30 0 0 -31 0 0 -32 0 0 -33 0 0 -34 0 0 -35 0 0 -36 0 0 -37 0 0 -38 0 0 -39 0 0 -40 0 free 43 reno_layer 36 0 -5 0 0 -6 0 0 -7 0 0 -8 0 0 -9 0 0 -10 0 0 -11 0 0 -12 0 0 -13 0 0 -14 0 0 -15 0 0 -16 0 0 -17 0 0 -18 0 0 -19 0 0 -20 0 0 -21 0 0 -22 0 0 -23 0 0 -24 0 0 -25 0 0 -26 0 0 -27 0 0 -28 0 0 -29 0 0 -30 0 0 -31 0 0 -32 0 0 -33 0 0 -34 0 0 -35 0 0 -36 0 0 -37 0 0 -38 0 0 -39 0 0 -40 0 decl 44 reno_layer 36 0 -5 0 0 -6 0 0 -7 9 2 [@ class (:link 1 0 -7 2 :) { public: (:include 1 0 -35 2 decl:) protected: (:include 1 0 -36 2 decl:) (:include 1 0 -37 2 decl:) private: ---unspecified--- };@] 0 -8 3 2 [@ template <class Tag,class T> class (:link 1 0 -8 2 :) { public: typedef T value_type; error_info( value_type const & ); private: ---unspecified--- };@] 0 -9 7 2 [@ template <class E, class Tag1, class T1> E const & operator<<( E const & x, (:link 1 0 -8 2 :)<Tag1,T1> const & v ); template <class E, class Tag1, class T1, ..., class TagN, class TN> E const & operator<<( E const & x, (:link http://www.boost.org/libs/tuple/doc/tuple_users_guide.html|tuple:)< (:link 1 0 -8 2 :)<Tag1,T1>, ..., (:link 1 0 -8 2 :)<TagN,TN> > const & v );@] 0 -10 3 2 [@ template <class ErrorInfo,class E> (:link http://www.boost.org/libs/smart_ptr/shared_ptr.htm|shared_ptr:)<typename ErrorInfo::value_type const> (:link 1 0 -10 2 :)( E const & x ); 0 -11 3 2 [@ template <class T> ---unspecified--- (:link 1 0 -11 2 :)( T const & x );@] 0 -12 5 2 [@ void (:link 1 0 -12 2 :)( (:link 1 0 -21 2 :) const & ep ); 0 -13 0 0 -14 0 0 -15 0 0 -16 0 0 -17 0 0 -18 0 0 -19 0 0 -20 9 2 [@ typedef (:link 1 0 -8 2 :)<struct tag_throw_function,char const *> throw_function; typedef (:link 1 0 -8 2 :)<struct tag_throw_file,char const *> throw_file; typedef (:link 1 0 -8 2 :)<struct tag_throw_line,int> throw_line; #define (:link 1 0 -20 2 :)\ ::boost::throw_function(BOOST_CURRENT_FUNCTION) <<\ ::boost::throw_file(__FILE__) <<\ ::boost::throw_line((int)__LINE__)@] 0 -21 3 2 [@ typedef ---unspecified--- (:link 1 0 -21 2 :);@] 0 -22 5 2 [@ template <class T> (:link 1 0 -21 2 :) (:link 1 0 -22 2 :)( T const & e );@] 0 -23 3 2 [@ template <class T> ---unspecified--- (:link 1 0 -23 2 :)( T const & e ); 0 -24 5 2 [@ (:link 1 0 -21 2 :) (:link 1 0 -24 2 :)();@] 0 -25 0 0 -26 3 2 [@ class (:link 1 0 -26 2 :): public std::exception public boost::exception { ---unspecified--- };@] 0 -27 0 0 -28 0 0 -29 5 2 [@#ifdef BOOST_NO_EXCEPTIONS void (:link 1 0 -29 2 :)( std::exception const & e ); // user defined #else template <class E> void (:link 1 0 -29 2 :)( E const & e ); #endif@] 0 -30 0 0 -31 0 0 -32 0 0 -33 0 0 -34 0 0 -35 3 2 [@ virtual char const * (:link 1 0 -35 2 :::)() const throw();@] 0 -36 7 2 [@ (:link 1 0 -36 2 :::)(); (:link 1 0 -36 2 :::)( (:link 1 0 -7 2 :) const & x );@] 0 -37 3 2 [@ (:link 1 0 -37 2 :::)();@] 0 -38 0 0 -39 0 0 -40 0 include 45 reno_layer 36 0 -5 27 2 !!Integrating Boost Exception in Existing Exception Class Hierarchies Some exception hierarchies can not be modified to make @@boost::(:link 1 0 -7 2 :)@@ a base type. For this case, the @@(:link 1 0 -11 2 :)()@@ function template can be used to make exception objects derive from @@boost::(:link 1 0 -7 2 :)@@ anyway. Here is an example: [@#include <(:link 1 0 -13 2 :)> #include <stdexcept> typedef boost::(:link 1 0 -8 2 :)<struct tag_std_range_min,size_t> std_range_min; typedef boost::(:link 1 0 -8 2 :)<struct tag_std_range_max,size_t> std_range_max; typedef boost::(:link 1 0 -8 2 :)<struct tag_std_range_index,size_t> std_range_index; template <class T> class my_container { public: size_t size() const; T const & operator[]( size_t i ) const { if( i > size() ) throw boost::(:link 1 0 -11 2 :)(std::range_error("Index out of range")) << std_range_min(0) << std_range_max(size()) << std_range_index(i); //.... } }; @] @@(:link 1 0 -11 2 |Enable_error_info:)<T>@@ returns an object of ''unspecified type'' which is guaranteed to derive from both @@boost::(:link 1 0 -7 2 :)@@ and @@T@@. This makes it possible to use @@(:link 1 0 -9 2 |operator<<:)()@@ to store additional information in the exception object. The exception can be intercepted as @@T &@@, therefore existing exception handling will not break. It can also be intercepted as @@boost::(:link 1 0 -7 2 :) &@@, so that (:link 1 0 -30 2 |more information can be added to the exception at a later time:). 0 -6 21 2 !!Logging of boost::exception Objects Class @@boost::(:link 1 0 -7 2 :)@@ provides a virtual member function @@(:link 1 0 -35 2 :::)()@@, with a signature identical to the familiar @@std::exception::what()@@ function. The default implementation returns a string value that is not presentable as a friendly user message, but because it is generated automatically, it is useful for debugging or logging purposes. Here is an example: [@#include <(:link 1 0 -13 2 :)> #include <iostream> void f(); //throws unknown types that derive from boost::(:link 1 0 -7 2 :). void g() { try { f(); } catch( boost::(:link 1 0 -7 2 :) & e ) { std::cerr << e.(:link 1 0 -35 2 :::)(); } }@] The @@(:link 1 0 -35 2 :::)()@@ member function iterates over all data objects stored in the @@boost::(:link 1 0 -7 2 :)@@ through @@(:link 1 0 -9 2 |operator<<:)()@@. The returned string is constructed by converting each data object to string and then concatenating these strings together. When the @@(:link 1 0 -8 2 :)<Tag,T>@@ template is instantiated, the system attempts overload resolution for an unqualified call to @@to_string(x)@@, where @@x@@ is of type @@T@@. If this is successful, the @@to_string()@@ overload is used to convert objects of type @@T@@ to string. Otherwise, the system attempts overload resolution for @@s << x@@, where @@s@@ is a @@std::ostringstream@@ and @@x@@ is of type @@T@@. If this is successful, the @@operator<<@@ overload is used to convert objects of type @@T@@ to string. Otherwise the system is unable to convert objects of type @@T@@ to string, and an unspecified stub string value is used without issuing a compile error. 0 -7 13 2 !!exception (:include synopsis:) Class @@boost::(:link 1 0 -7 2 :)@@ is designed to be used as a universal base for user-defined exception types. An object of any type deriving from @@boost::(:link 1 0 -7 2 :)@@ can store data of arbitrary types, using the @@ 1 0 -8 2 @@ wrapper and @@(:link 1 0 -9 2 |operator<<:)()@@. To retrieve data from a @@boost::(:link 1 0 -7 2 :)@@ object, use the @@(:link 1 0 -10 2 :)()@@ function template. (:include members:) 0 -8 21 2 !!!error_info (:include synopsis:) !!!!Requirements: @@T@@ must have accessible copy constructor and must not be a reference. !!!!Description: This class template is used to associate a @@Tag@@ type with a value type @@T@@. Objects of type @@(:link 1 0 -8 2 :)<Tag,T>@@ can be passed to @@(:link 1 0 -9 2 |operator<<:)()@@ to be stored in objects of type @@boost::(:link 1 0 -7 2 :)@@. !!!!Note: The header @@<(:link 1 0 -19 2 :)>@@ provides a declaration of the @@(:link 1 0 -8 2 :)@@ template, which is sufficient for the purpose of @@typedef@@ing an instance for specific @@Tag@@ and @@T@@, like this: [@#include <(:link 1 0 -19 2 :)> typedef boost::(:link 1 0 -8 2 :)<struct tag_errno,int> errno_info;@] Of course, to actually add an @@errno_info@@ object to exceptions using @@(:link 1 0 -9 2 |operator<<:)()@@, or to retrieve it using @@(:link 1 0 -10 2 :)()@@, you must first @@#include <(:link 1 0 -25 2 :)>@@. 0 -9 7 2 !!!operator<<() (:include synopsis:) !!!!Requirements: @@E@@ must be @@boost::(:link 1 0 -7 2 :)@@, or a type that derives (indirectly) from @@boost::(:link 1 0 -7 2 :)@@. !!!!Effects: * The first overload stores a copy of @@v@@ into @@x@@. If @@x@@ already contains data of type @@(:link 1 0 -8 2 :)<Tag1,T1>@@, that data is overwritten. * The @@boost::(:link http://www.boost.org/libs/tuple/doc/tuple_users_guide.html|tuple:)@@ overload is equivalent to @@x << v.(:link http://www.boost.org/libs/tuple/doc/tuple_users_guide.html#accessing_elements|get:)<0>() << ... << v.(:link http://www.boost.org/libs/tuple/doc/tuple_users_guide.html#accessing_elements|get:)<N>()@@. !!!!Returns: @@x@@. (:include throws:) 0 -10 7 2 !!!get_error_info() (:include synopsis:) !!!!Requirements: The type of the @@x@@ object must derive from @@boost::(:link 1 0 -7 2 :)@@; @@ErrorInfo@@ must be an instance of the @@(:link 1 0 -8 2 :)@@ template. !!!!Returns: If @@x@@ does not store an object of type @@ErrorInfo@@, returns an empty @@(:link http://www.boost.org/libs/smart_ptr/shared_ptr.htm|shared_ptr:)@@; otherwise returns pointer to the stored value. Use @@(:link 1 0 -9 2 |operator<<:)()@@ to store values in exception objects. !!!!Throws: Nothing. 0 -11 7 2 !!!enable_error_info() (:include synopsis:) !!!!Requirements: @@T@@ must be a user-defined type with accessible no-throw copy constructor. !!!!Returns: An object of unspecified type with no-throw copy semantics, which derives publicly from both @@T@@, and class @@boost::(:link 1 0 -7 2 :)@@. The @@T@@ sub-object is initialized from @@x@@ by the @@T@@ copy constructor. If @@T@@ already derives from @@boost::(:link 1 0 -7 2 :)@@, then the type of the returned object does not derive @@boost::(:link 1 0 -7 2 :)@@. !!!!Throws: Nothing. 0 -12 1 2 !!!rethrow_exception() (:include synopsis:) !!!!Precondition: @@ep@@ shall not be null. !!!!Throws: The exception to which @@ep@@ refers. 0 -13 0 0 -14 0 0 -15 0 0 -16 0 0 -17 0 0 -18 0 0 -19 0 0 -20 7 2 !!!BOOST_ERROR_INFO (:include synopsis:) This macro is designed to be used with @@(:link 1 0 -9 2 |operator<<:)()@@ when throwing a @@boost::(:link 1 0 -7 2 :)@@, to store information about the location of the throw statement. It can be chained with other @@(:link 1 0 -8 2 :)@@s in a single throw expression. 0 -21 15 2 !!!exception_ptr (:include synopsis:) The @@(:link 1 0 -21 2 :)@@ type can be used to refer to a copy of an exception object. It is Default Constructible, Copy Constructible, Assignable and Equality Comparable; @@(:link 1 0 -21 2 :)@@'s operations do not throw. Two instances of @@(:link 1 0 -21 2 :)@@ are equivalent and compare equal if and only if they refer to the same exception. The default constructor of @@(:link 1 0 -21 2 :)@@ produces the null value of the type. The null value is equivalent only to itself. !!!!Note: @@(:link 1 0 -21 2 :)@@ objects are returned by @@(:link 1 0 -24 2 :)()@@ and @@(:link 1 0 -22 2 :)()@@. 0 -22 3 2 !!!copy_exception() (:include synopsis:) !!!!Effects: As if @@try { throw e; } catch( ... ) { return 1 0 -24 2 (); }@@ 0 -23 15 2 !!!enable_current_exception() (:include synopsis:) !!!!Requirements: @@T@@ must have an accessible no-throw copy constructor !!!!Returns: An object of ''unspecified'' type which derives publicly from @@T@@. That is, the returned object can be intercepted by a @@catch(T &)@@. !!!!Description: This function is designed to be used directly in a throw-expression to enable the cloning support in Boost Exception. For example: [@class my_exception: public std::exception { }; .... throw boost::(:link 1 0 -23 2 :)(my_exception());@] Unless @@(:link 1 0 -23 2 :)()@@ is called at the time an exception object is used in a throw-expression, any attempt to copy it using @@(:link 1 0 -24 2 :)()@@ returns an @@(:link 1 0 -21 2 :)@@ which refers to an instance of @@(:link 1 0 -26 2 :)@@. !!!!Note: Instead of using the @@throw@@ keyword directly, it is preferable to call @@boost::(:link 1 0 -29 2 :)()@@. This is guaranteed to throw an exception that derives from @@boost::(:link 1 0 -7 2 :)@@ and supports cloning. 0 -24 29 2 !!!current_exception() (:include synopsis:) !!!!Requirements: The @@(:link 1 0 -24 2 :)()@@ function must not be called outside of a @@catch@@ block. !!!!Returns: * An @@(:link 1 0 -21 2 :)@@ that refers to the currently handled exception or a copy of the currently handled exception. * If the function needs to allocate memory and the attempt fails, it returns an @@(:link 1 0 -21 2 :)@@ that refers to an instance of @@std::bad_alloc@@. !!!!Notes: * It is unspecified whether the return values of two successive calls to @@(:link 1 0 -24 2 :)()@@ refer to the same exception object. * Correct implementation of @@(:link 1 0 -24 2 :)()@@ may require compiler support, unless @@(:link 1 0 -23 2 :)()@@ is used at the time the currently handled exception object was passed to @@throw@@. If @@(:link 1 0 -23 2 :)()@@ is not used, and if the compiler does not provide the necessary support, then @@(:link 1 0 -24 2 :)()@@ may return an @@(:link 1 0 -21 2 :)@@ that refers to an instance of @@(:link 1 0 -26 2 :)@@. In this case, if the original exception object derives from @@boost::(:link 1 0 -7 2 :)@@, then the @@boost::(:link 1 0 -7 2 :)@@ sub-object of the @@(:link 1 0 -26 2 :)@@ object is initialized by the @@boost::(:link 1 0 -7 2 :)@@ copy constructor. 0 -25 0 0 -26 5 2 !!!unknown_exception (:include synopsis:) This type is used by the (:link 1 0 -28 2 |cloning:) support in Boost Exception. Please see @@(:link 1 0 -24 2 :)()@@. 0 -27 0 0 -28 11 2 !!Transporting of Exceptions between Threads Boost Exception supports transporting of exception objects between threads through cloning. This system is similar to (:link http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2179.html|N2179:), but because Boost Exception can not rely on language support, the use of @@(:link 1 0 -23 2 :)()@@ at the time of the throw is required in order to use cloning. !!!!Note: All exceptions emitted by the familiar function @@boost::(:link 1 0 -29 2 :)()@@ are guaranteed to derive from @@boost::(:link 1 0 -7 2 :)@@ and to support cloning. (:include 1 0 -33 2 :) (:include 1 0 -39 2 :) 0 -29 9 2 !!!throw_exception() (:include synopsis:) !!!!Effects: * If @@BOOST_NO_EXCEPTIONS@@ is not defined, @@boost::(:link 1 0 -29 2 :)(e)@@ is equivalent to @@throw boost::(:link 1 0 -23 2 :)(boost::(:link 1 0 -11 2 :)(e))@@, unless @@BOOST_EXCEPTION_DISABLE@@ is defined, in which case @@boost::(:link 1 0 -29 2 :)(e)@@ is equivalent to @@throw e;@@ * If @@BOOST_NO_EXCEPTIONS@@ is defined, the function is left undefined, and the user is expected to supply an appropriate definition. Callers of @@throw_exception@@ are allowed to assume that the function never returns; therefore, if the user-defined @@throw_exception@@ returns, the behavior is undefined. 0 -30 11 2 !!Transporting of Arbitrary Data to the Catch Site All exception types that derive from @@boost::(:link 1 0 -7 2 :)@@ can be used as type-safe containers of arbitrary data objects, while complying with the no-throw requirements (15.5.1) of the ANSI C++ standard for exception classes. Data can be added to a @@boost::(:link 1 0 -7 2 :)@@ at the time of the throw, or at a later time. (:include 1 0 -34 2 :) (:include 1 0 -40 2 :) (:include 1 0 -38 2 :) 0 -31 0 0 -32 0 0 -33 9 2 !!!Using enable_current_exception() at the Time of the Throw Here is how cloning can be enabled in a throw-expression (15.1): [@#include <(:link 1 0 -16 2 :)> #include <(:link 1 0 -25 2 :)> #include <stdio.h> #include <errno.h> typedef boost::error_info<struct tag_errno,int> errno_info; class file_read_error: public boost::(:link 1 0 -7 2 :) { }; void file_read( FILE * f, void * buffer, size_t size ) { if( size!=fread(buffer,1,size,f) ) throw boost::(:link 1 0 -23 2 :)(file_read_error()) << errno_info(errno); }@] 0 -34 19 2 !!!Adding of Arbitrary Data at the Point of the Throw The following example demonstrates how @@errno@@ can be stored in exception objects using Boost Exception: [@#include <(:link 1 0 -13 2 :)> #include <errno.h> #include <iostream> typedef boost::(:link 1 0 -8 2 :)<struct tag_errno,int> errno_info; //(1) class my_error: public boost::(:link 1 0 -7 2 :), public std::exception { }; //(2) void f() { throw my_error() << errno_info(errno); //(3) } @] First, we instantiate the @@(:link 1 0 -8 2 :)@@ template using a unique identifier -- @@tag_errno@@, and the type of the info it identifies -- @@int@@. This provides compile-time type safety for the various values stored in exception objects. Second, we define class @@my_error@@, which derives from @@boost::(:link 1 0 -7 2 :)@@. Finally, (3) illustrates how the @@typedef@@ from (1) can be used with @@(:link 1 0 -9 2 |operator<<:)()@@ to store values in exception objects at the point of the throw. The stored @@errno@@ value can be recovered at a later time like this: [@// ...continued void g() { try { f(); } catch( my_error & x ) { if( boost::shared_ptr<int const> err=boost::(:link 1 0 -10 2 :)<errno_info>(x) ) std::cerr << "Error code: " << *err; } }@] The @@(:link 1 0 -10 2 :)()@@ function template is instantiated with the @@typedef@@ from (1), and is passed an exception object of any type that derives publicly from @@boost::(:link 1 0 -7 2 :)@@. If the exception object contains the requested value, the returned @@(:link http://www.boost.org/libs/smart_ptr/shared_ptr.htm|shared_ptr:)@@ will point to it; otherwise an empty @@(:link http://www.boost.org/libs/smart_ptr/shared_ptr.htm|shared_ptr:)@@ is returned. 0 -35 7 2 !!!exception::what() (:include decl:) !!!!Returns: An string representation of all data stored in the @@boost::(:link 1 0 -7 2 :)@@ object by the @@(:link 1 0 -9 2 |operator<<:)()@@ function. See "(:link 1 0 -6 2 :)" for details. !!!!Throws: Nothing. !!!!Note: The return value remains valid until the exception object from which it is obtained is destroyed or modified. 0 -36 7 2 !!!exception constructors (:include decl:) !!!!Effects: * Default constructor: initializes an empty @@boost::(:link 1 0 -7 2 :)@@ object. * Copy constructor: initializes a @@boost::(:link 1 0 -7 2 :)@@ object which shares with @@x@@ all data added through @@(:link 1 0 -9 2 |operator<<:)()@@, including data that is added at a future time. !!!!Throws: Nothing. 0 -37 3 2 !!!exception destructor (:include decl:) !!!!Effects: Frees all resources associated with a @@boost::(:link 1 0 -7 2 :)@@ object. !!!!Throws: Nothing. 0 -38 13 2 !!!Adding Grouped Data to Exceptions The code snippet below demonstrates how @@boost::(:link http://www.boost.org/libs/tuple/doc/tuple_users_guide.html|tuple:)@@ can be used to bundle the name of the function that failed, together with the reported @@errno@@ so that they can be added to exception objects more conveniently together: [@#include <(:link 1 0 -18 2 :)> #include <boost/shared_ptr.hpp> #include <stdio.h> #include <string> #include <errno.h> typedef boost::(:link 1 0 -8 2 :)<struct tag_file_name,std::string> file_name_info; typedef boost::(:link 1 0 -8 2 :)<struct tag_function,char const *> function_info; typedef boost::(:link 1 0 -8 2 :)<struct tag_errno,int> errno_info; typedef boost::tuple<function_info,errno_info> clib_failure; class file_open_error: public boost::(:link 1 0 -7 2 :) { }; boost::shared_ptr<FILE> file_open( char const * name, char const * mode ) { if( FILE * f=fopen(name,mode) ) return boost::shared_ptr<FILE>(f,fclose); else throw file_open_error() << file_name_info(name) << clib_failure("fopen",errno); }@] Note that the members of a @@boost::(:link http://www.boost.org/libs/tuple/doc/tuple_users_guide.html|tuple:)@@ are stored separately in exception objects; they can only be retrieved individually, using @@(:link 1 0 -10 2 :)()@@. 0 -39 41 2 !!!Cloning and Re-throwing an Exception When you catch a @@boost::(:link 1 0 -7 2 :)@@, you can call @@(:link 1 0 -24 2 :)()@@ to get an @@(:link 1 0 -21 2 :)@@ object: [@#include <(:link 1 0 -14 2 :)> #include <boost/thread.hpp> #include <boost/bind.hpp> void do_work(); //throws cloning-enabled boost::(:link 1 0 -7 2 :)s void worker_thread( boost::(:link 1 0 -21 2 :) & error ) { try { do_work(); error = boost::(:link 1 0 -21 2 :)(); } catch( ... ) { error = boost::(:link 1 0 -24 2 :)(); } }@] In the above example, note that @@(:link 1 0 -24 2 :)()@@ captures the original type of the exception object, even though @@e@@ refers to the base type @@boost::(:link 1 0 -7 2 :)@@. This original type can be thrown again using the @@(:link 1 0 -12 2 :)()@@ function: [@// ...continued void work() { boost::(:link 1 0 -21 2 :) error; boost::(:link http://www.boost.org/doc/html/boost/thread.html|thread:) t( boost::(:link http://www.boost.org/libs/bind/bind.html|bind:)(worker_thread,boost::(:link http://www.boost.org/doc/html/ref.html|ref:)(error)) ); t.(:link http://www.boost.org/doc/html/boost/thread.html|join:)(); if( error ) boost::(:link 1 0 -12 2 :)(error); }@] @@(:link 1 0 -24 2 |Clone_exception:)()@@ could fail to copy the original exception object in the following cases: * if there is not enough memory, in which case the returned @@(:link 1 0 -21 2 :)@@ points to an instance of @@std::bad_alloc@@, or * if @@(:link 1 0 -23 2 :)()@@ was not used in the throw-expression passed to the original @@throw@@ statement, in which case the returned @@(:link 1 0 -21 2 :)@@ points to an instance of @@(:link 1 0 -26 2 :)@@. Regardless, the use of @@(:link 1 0 -24 2 :)()@@ and @@(:link 1 0 -12 2 :)()@@ in the above examples is well-formed. 0 -40 21 2 !!!Adding of Arbitrary Data to Active Exception Objects Sometimes the throw site does not have all the information that is needed at the catch site to make sense of what went wrong. Here is an example: [@#include <stdio.h> #include <string> class file_read_error { public: explicit file_read_error( std::string const & fn ): fn_(fn) { }; std::string const & file_name() const { return fn_; } private: std::string fn_; }; void file_read( FILE * f, void * buffer, size_t size ) { if( size!=fread(buffer,1,size,f) ) throw file_read_error("????"); }@] We have defined an exception class @@file_read_error@@ which can store a file name, so that when we catch a @@file_read_error@@ object, we know which file the failure is related to. However, the @@file_read@@ function does not have the file name at the time of the throw; all it has is a @@FILE@@ handle. One possible solution is to not use @@FILE@@ handles directly. We could have our own @@class file@@ which stores both a @@FILE@@ handle and a file name, and pass that to @@file_read()@@. However, this could be problematic if we communicate with 3rd party code that does not use our @@class file@@ (probably because they have their own similar class.) A better solution is to make class @@file_read_error@@ derive (possibly indirectly) from @@boost::(:link 1 0 -7 2 :)@@, and free the @@file_read()@@ function from the burden of storing the file name in exceptions it throws: [@#include <(:link 1 0 -13 2 :)> #include <stdio.h> #include <errno.h> typedef boost::(:link 1 0 -8 2 :)<struct tag_errno,int> errno_info; class file_read_error: public boost::(:link 1 0 -7 2 :) { }; void file_read( FILE * f, void * buffer, size_t size ) { if( size!=fread(buffer,1,size,f) ) throw file_read_error() << errno_info(errno); }@] If @@file_read()@@ detects a failure, it throws an exception which contains the information that is available at the time, namely the @@errno@@. Other relevant information, such as the file name, can be added in a context higher up the call stack, where it is known naturally: [@#include <(:link 1 0 -13 2 :)> #include <boost/shared_ptr.hpp> #include <stdio.h> #include <string> typedef boost::(:link 1 0 -8 2 :)<struct tag_file_name,std::string> file_name_info; boost::shared_ptr<FILE> file_open( char const * file_name, char const * mode ); void file_read( FILE * f, void * buffer, size_t size ); void parse_file( char const * file_name ) { boost::shared_ptr<FILE> f = file_open(file_name,"rb"); assert(f); try { char buf[1024]; file_read( f.get(), buf, sizeof(buf) ); } catch( boost::(:link 1 0 -7 2 :) & e ) { e << file_name_info(file_name); throw; } }@] The above function is (almost) exception-neutral -- if an exception is emitted by any function call within the @@try@@ block, @@parse_file()@@ does not need to do any real work, but it intercepts any @@boost::(:link 1 0 -7 2 :)@@ object, stores the file name, and re-throws using a throw-expression with no operand (15.1.6). The rationale for catching any @@boost::(:link 1 0 -7 2 :)@@ object is that the file name is relevant to any failure that occurs in @@parse_file()@@, ''even if the failure is unrelated to file I/O''. As usual, the stored data can be retrieved using @@(:link 1 0 -10 2 :)()@@. throws 46 reno_layer 36 0 -5 0 0 -6 0 0 -7 0 0 -8 3 2 !!!!Throws: @@std::bad_alloc@@, or any other exception resulting from copying any of the arguments of @@(:link 1 0 -8 2 :)()@@. 0 -9 1 2 !!!!Throws: @@std::bad_alloc@@, or any exception emitted by @@T1..TN@@ copy constructor. 0 -10 0 0 -11 0 0 -12 0 0 -13 0 0 -14 0 0 -15 0 0 -16 0 0 -17 0 0 -18 0 0 -19 0 0 -20 0 0 -21 0 0 -22 0 0 -23 0 0 -24 0 0 -25 0 0 -26 0 0 -27 0 0 -28 0 0 -29 0 0 -30 0 0 -31 0 0 -32 0 0 -33 0 0 -34 0 0 -35 0 0 -36 0 0 -37 0 0 -38 0 0 -39 0 0 -40 0 members 47 reno_layer 36 0 -5 0 0 -6 0 0 -7 7 2 (:include 1 0 -36 2 :) (:include 1 0 -37 2 :) (:include 1 0 -35 2 :) 0 -8 0 0 -9 0 0 -10 0 0 -11 0 0 -12 0 0 -13 0 0 -14 0 0 -15 0 0 -16 0 0 -17 0 0 -18 0 0 -19 0 0 -20 0 0 -21 0 0 -22 0 0 -23 0 0 -24 0 0 -25 0 0 -26 0 0 -27 0 0 -28 0 0 -29 0 0 -30 0 0 -31 0 0 -32 0 0 -33 0 0 -34 0 0 -35 0 0 -36 0 0 -37 0 0 -38 0 0 -39 0 0 -40 0 synopsis 48 reno_layer 36 0 -5 0 0 -6 0 0 -7 3 2 @@#include <(:link 1 0 -31 2 :)>@@ [@namespace boost { (:include decl:) }@] 0 -8 3 2 @@#include <(:link 1 0 -25 2 :)>@@ [@namespace boost { (:include decl:) }@] 0 -9 5 2 @@#include <(:link 1 0 -25 2 :)>@@\\ @@#include <(:link 1 0 -18 2 :)> [@namespace boost { (:include decl:) }@] 0 -10 3 2 @@#include <(:link 1 0 -25 2 :)>@@ [@namespace boost { (:include decl:) }@] 0 -11 3 2 @@#include <(:link 1 0 -17 2 :)>@@ [@namespace boost { (:include decl:) }@] 0 -12 3 2 @@#include <(:link 1 0 -14 2 :)>@@ [@namespace boost { (:include decl:) }@] 0 -13 0 0 -14 0 0 -15 0 0 -16 0 0 -17 0 0 -18 0 0 -19 0 0 -20 3 2 @@#include <(:link 1 0 -25 2 :)>@@ [@namespace boost { (:include decl:) }@] 0 -21 3 2 @@#include <(:link 1 0 -14 2 :)>@@ [@namespace boost { (:include decl:) }@] 0 -22 3 2 @@#include <(:link 1 0 -14 2 :)>@@ [@namespace boost { (:include decl:) }@] 0 -23 3 2 @@#include <(:link 1 0 -16 2 :)>@@ [@namespace boost { (:include decl:) }@] 0 -24 3 2 @@#include 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