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| <a name="container.known_issues"></a><a class="link" href="known_issues.html" title="Known Issues">Known Issues</a> |
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| <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"><</span><span class="identifier">MyType</span><span class="special">></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">&</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">//<--- ERROR: can't convert 'const holder&' to 'holder&'</span> |
| <span class="comment">//Compiler-generated copy constructor is non-const:</span> |
| <span class="comment">// holder& operator(holder &)</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> |
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| <td align="right"><div class="copyright-footer">Copyright © 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>) |
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