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<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>Known Issues</title> <link rel="stylesheet" href="../../../doc/src/boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.78.1"> <link rel="home" href="../index.html" title="The Boost C++ Libraries BoostBook Documentation Subset"> <link rel="up" href="../container.html" title="Chapter&#160;8.&#160;Boost.Container"> <link rel="prev" href="Cpp11_conformance.html" title="C++11/C++14 Conformance"> <link rel="next" href="history_and_reasons.html" title="History and reasons to use Boost.Container"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table cellpadding="2" width="100%"><tr> <td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../boost.png"></td> <td align="center"><a href="../../../index.html">Home</a></td> <td align="center"><a href="../../../libs/libraries.htm">Libraries</a></td> <td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> <td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> <td align="center"><a href="../../../more/index.htm">More</a></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="Cpp11_conformance.html"><img src="../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../container.html"><img src="../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="history_and_reasons.html"><img src="../../../doc/src/images/next.png" alt="Next"></a> </div> <div class="section"> <div class="titlepage"><div><div><h2 class="title" style="clear: both"> <a name="container.known_issues"></a><a class="link" href="known_issues.html" title="Known Issues">Known Issues</a> </h2></div></div></div> <div class="toc"><dl class="toc"><dt><span class="section"><a href="known_issues.html#container.known_issues.move_emulation_limitations">Move emulation limitations in C++03 compilers</a></span></dt></dl></div> <div class="section"> <div class="titlepage"><div><div><h3 class="title"> <a name="container.known_issues.move_emulation_limitations"></a><a class="link" href="known_issues.html#container.known_issues.move_emulation_limitations" title="Move emulation limitations in C++03 compilers">Move emulation limitations in C++03 compilers</a> </h3></div></div></div> <p> <span class="bold"><strong>Boost.Container</strong></span> uses <span class="bold"><strong>Boost.Move</strong></span> to implement move semantics both in C++03 and C++11 compilers. However, as explained in <a href="http://www.boost.org/doc/libs/release/doc/html/move/emulation_limitations.html" target="_top">Emulation limitations</a>, there are some limitations in C++03 compilers that might surprise <span class="bold"><strong>Boost.Container</strong></span> users. </p> <p> The most noticeable problem is when <span class="bold"><strong>Boost.Container</strong></span> containers are placed in a struct with a compiler-generated assignment operator: </p> <pre class="programlisting"><span class="keyword">class</span> <span class="identifier">holder</span> <span class="special">{</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">container</span><span class="special">::</span><span class="identifier">vector</span><span class="special">&lt;</span><span class="identifier">MyType</span><span class="special">&gt;</span> <span class="identifier">vect</span><span class="special">;</span> <span class="special">};</span> <span class="keyword">void</span> <span class="identifier">func</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">holder</span><span class="special">&amp;</span> <span class="identifier">h</span><span class="special">)</span> <span class="special">{</span> <span class="identifier">holder</span> <span class="identifier">copy_h</span><span class="special">(</span><span class="identifier">h</span><span class="special">);</span> <span class="comment">//&lt;--- ERROR: can't convert 'const holder&amp;' to 'holder&amp;'</span> <span class="comment">//Compiler-generated copy constructor is non-const:</span> <span class="comment">// holder&amp; operator(holder &amp;)</span> <span class="comment">//!!!</span> <span class="special">}</span> </pre> <p> This limitation forces the user to define a const version of the copy assignment, in all classes holding containers, which might be annoying in some cases. </p> </div> </div> <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> <td align="left"></td> <td align="right"><div class="copyright-footer">Copyright &#169; 2009-2013 Ion Gaztanaga<p> Distributed under 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" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) </p> </div></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="Cpp11_conformance.html"><img src="../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../container.html"><img src="../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="history_and_reasons.html"><img src="../../../doc/src/images/next.png" alt="Next"></a> </div> </body> </html>