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[SVN r17044]
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Peter Dimov
2003-01-25 17:58:01 +00:00
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<h1><img src="../../c++boost.gif" alt="c++boost.gif (8819 bytes)" align="middle" width="277" height="86">Smart
Pointers</h1>
<p><a href="#Introduction">Introduction</a><br>
<a href="#common_requirements">Common Requirements</a><br>
<a href="#Exception_Safety">Exception Safety</a><br>
<a href="#Exception-specifications">Exception-specifications</a><br>
<a href="#History">History and Acknowledgements</a><br>
<a href="#References">References</a></p>
<a href="#common_requirements">Common Requirements</a><br>
<a href="#Exception_Safety">Exception Safety</a><br>
<a href="#Exception-specifications">Exception-specifications</a><br>
<a href="#History">History and Acknowledgements</a><br>
<a href="#References">References</a></p>
<h2><a name="Introduction">Introduction</a></h2>
<p>Smart pointers are objects which store pointers to dynamically allocated (heap)
objects. They behave much like built-in C++ pointers except that they
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<p>They are examples of the "resource acquisition is initialization" idiom
described in Bjarne Stroustrup's "The C++ Programming Language", 3rd edition,
Section 14.4, Resource Management.</p>
<p>A test program, <a href="smart_ptr_test.cpp">smart_ptr_test.cpp</a>, is provided
<p>A test program, <a href="test/smart_ptr_test.cpp">smart_ptr_test.cpp</a>, is provided
to verify correct operation.</p>
<p>A page on <a href="compatibility.htm">compatibility</a> with older versions of
the Boost smart pointer library describes some of the changes since earlier
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<p>September 1999. Luis Coelho provided <b>shared_ptr::swap</b> and <b>shared_array::swap</b></p>
<p>May 1999. In April and May, 1999, Valentin Bonnard and David Abrahams made a
number of suggestions resulting in numerous improvements.</p>
<p>October 1998. Beman Dawes proposed reviving the original semantics under the names <b>safe_ptr</b>
and <b>counted_ptr</b>, meeting of Per Andersson, Matt
<p>October 1998. Beman Dawes proposed reviving the original semantics under the
names <b>safe_ptr</b> and <b>counted_ptr</b>, meeting of Per Andersson, Matt
Austern, Greg Colvin, Sean Corfield, Pete Becker, Nico Josuttis, Dietmar Kühl,
Nathan Myers, Chichiang Wan and Judy Ward. During the discussion, the four
new class names were finalized, it was decided that there was no need to exactly
Nathan Myers, Chichiang Wan and Judy Ward. During the discussion, the four new
class names were finalized, it was decided that there was no need to exactly
follow the <b>std::auto_ptr</b> interface, and various function signatures and
semantics were finalized.</p>
<p>Over the next three months, several implementations were considered for <b>shared_ptr</b>,
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experimented with.</p>
<p>But Greg Colvin and Jerry Schwarz argued that "parameterization will discourage
users", and in the end we choose to supply only the direct implementation.</p>
<p>Summer, 1994. Greg Colvin proposed to the C++ Standards Committee
classes named <b>auto_ptr</b> and <b>counted_ptr</b> which were very similar to
what we now call <b>scoped_ptr</b> and <b>shared_ptr</b>.
<a href="#Col-94">[Col-94]</a> In one of the very
few cases where the Library Working Group's recommendations were not followed
by the full committee, <b>counted_ptr</b> was rejected and surprising
<p>Summer, 1994. Greg Colvin proposed to the C++ Standards Committee classes named <b>auto_ptr</b>
and <b>counted_ptr</b> which were very similar to what we now call <b>scoped_ptr</b>
and <b>shared_ptr</b>. <a href="#Col-94">[Col-94]</a> In one of the very few
cases where the Library Working Group's recommendations were not followed by
the full committee, <b>counted_ptr</b> was rejected and surprising
transfer-of-ownership semantics were added to <b>auto_ptr</b>.</p>
<h2><a name="References">References</a></h2>
<p>[<a name="Col-94">Col-94</a>] Gregory Colvin,
<a href="http://std.dkuug.dk/jtc1/sc22/wg21/docs/papers/1994/N0555.pdf">
Exception Safe Smart Pointers</a>, C++ committee document 94-168/N0555,
July, 1994.</p>
<p>[<a name="E&amp;D-94">E&amp;D-94</a>] John R. Ellis &amp; David L. Detlefs,
<a href="http://www.usenix.org/publications/library/proceedings/c++94/full_papers/ellis.a">
Safe, Efficient Garbage Collection for C++</a>, Usenix Proceedings,
February, 1994. This paper includes an extensive discussion of weak
pointers and an extensive bibliography.</p>
<p>[<a name="Col-94">Col-94</a>] Gregory Colvin, <a href="http://std.dkuug.dk/jtc1/sc22/wg21/docs/papers/1994/N0555.pdf">
Exception Safe Smart Pointers</a>, C++ committee document 94-168/N0555,
July, 1994.</p>
<p>[<a name="E&amp;D-94">E&amp;D-94</a>] John R. Ellis &amp; David L. Detlefs, <a href="http://www.usenix.org/publications/library/proceedings/c++94/full_papers/ellis.a">
Safe, Efficient Garbage Collection for C++</a>, Usenix Proceedings,
February, 1994. This paper includes an extensive discussion of weak pointers
and an extensive bibliography.</p>
<hr>
<p>Revised <!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %B %Y" startspan
-->15 January 2003<!--webbot bot="Timestamp" endspan i-checksum="32303"
-->
15 January 2003<!--webbot bot="Timestamp" endspan i-checksum="32303"
--></p>
<p>Copyright 1999 Greg Colvin and Beman Dawes. Copyright 2002 Darin Adler.
Permission to copy, use, modify, sell and distribute this document is granted
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"as is" without express or implied warranty, and with no claim as to its
suitability for any purpose.</p>
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