1<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 2<html> 3<head> 4<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 5<title>Known Issues</title> 6<link rel="stylesheet" href="../../../doc/src/boostbook.css" type="text/css"> 7<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 8<link rel="home" href="../index.html" title="The Boost C++ Libraries BoostBook Documentation Subset"> 9<link rel="up" href="../container.html" title="Chapter 9. Boost.Container"> 10<link rel="prev" href="cpp_conformance.html" title="C++11/C++14/C++17 Conformance"> 11<link rel="next" href="history_and_reasons.html" title="History and reasons to use Boost.Container"> 12</head> 13<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 14<table cellpadding="2" width="100%"><tr> 15<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../boost.png"></td> 16<td align="center"><a href="../../../index.html">Home</a></td> 17<td align="center"><a href="../../../libs/libraries.htm">Libraries</a></td> 18<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> 19<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> 20<td align="center"><a href="../../../more/index.htm">More</a></td> 21</tr></table> 22<hr> 23<div class="spirit-nav"> 24<a accesskey="p" href="cpp_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> 25</div> 26<div class="section"> 27<div class="titlepage"><div><div><h2 class="title" style="clear: both"> 28<a name="container.known_issues"></a><a class="link" href="known_issues.html" title="Known Issues">Known Issues</a> 29</h2></div></div></div> 30<div class="toc"><dl class="toc"><dt><span class="section"><a href="known_issues.html#container.known_issues.move_emulation_limitations">Move 31 emulation limitations in C++03 compilers</a></span></dt></dl></div> 32<div class="section"> 33<div class="titlepage"><div><div><h3 class="title"> 34<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 35 emulation limitations in C++03 compilers</a> 36</h3></div></div></div> 37<p> 38 <span class="bold"><strong>Boost.Container</strong></span> uses <span class="bold"><strong>Boost.Move</strong></span> 39 to implement move semantics both in C++03 and C++11 compilers. However, as 40 explained in <a href="http://www.boost.org/doc/libs/release/doc/html/move/emulation_limitations.html" target="_top">Emulation 41 limitations</a>, there are some limitations in C++03 compilers that might 42 surprise <span class="bold"><strong>Boost.Container</strong></span> users. 43 </p> 44<p> 45 The most noticeable problem is when <span class="bold"><strong>Boost.Container</strong></span> 46 containers are placed in a struct with a compiler-generated assignment operator: 47 </p> 48<pre class="programlisting"><span class="keyword">class</span> <span class="identifier">holder</span> 49<span class="special">{</span> 50 <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> 51<span class="special">};</span> 52 53<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> 54<span class="special">{</span> 55 <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> 56 <span class="comment">//Compiler-generated copy constructor is non-const:</span> 57 <span class="comment">// holder& operator(holder &)</span> 58 <span class="comment">//!!!</span> 59<span class="special">}</span> 60</pre> 61<p> 62 This limitation forces the user to define a const version of the copy assignment, 63 in all classes holding containers, which might be annoying in some cases. 64 </p> 65</div> 66</div> 67<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 68<td align="left"></td> 69<td align="right"><div class="copyright-footer">Copyright © 2009-2018 Ion Gaztanaga<p> 70 Distributed under the Boost Software License, Version 1.0. (See accompanying 71 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>) 72 </p> 73</div></td> 74</tr></table> 75<hr> 76<div class="spirit-nav"> 77<a accesskey="p" href="cpp_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> 78</div> 79</body> 80</html> 81
