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| <div class="titlepage"><div><div><h2 class="title" style="clear: both"> |
| <a name="core.noncopyable"></a><a class="link" href="noncopyable.html" title="noncopyable">noncopyable</a> |
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| <div class="toc"><dl class="toc"><dt><span class="section"><a href="noncopyable.html#core.noncopyable.header_boost_core_noncopyable_hp">Header |
| <boost/core/noncopyable.hpp></a></span></dt></dl></div> |
| <div class="simplesect"> |
| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="idp86898192"></a>Authors</h3></div></div></div> |
| <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"> |
| Dave Abrahams |
| </li></ul></div> |
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| <div class="section"> |
| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="core.noncopyable.header_boost_core_noncopyable_hp"></a><a class="link" href="noncopyable.html#core.noncopyable.header_boost_core_noncopyable_hp" title="Header <boost/core/noncopyable.hpp>">Header |
| <boost/core/noncopyable.hpp></a> |
| </h3></div></div></div> |
| <p> |
| The header <code class="computeroutput"><span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">noncopyable</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span></code> |
| defines the class <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">noncopyable</span></code>. It is intended to be used |
| as a private base. <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">noncopyable</span></code> |
| has private (under C++03) or deleted (under C++11) copy constructor and a |
| copy assignment operator and can't be copied or assigned; a class that derives |
| from it inherits these properties. |
| </p> |
| <p> |
| <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">noncopyable</span></code> was originally contributed |
| by Dave Abrahams. |
| </p> |
| <div class="section"> |
| <div class="titlepage"><div><div><h4 class="title"> |
| <a name="core.noncopyable.header_boost_core_noncopyable_hp.synopsis"></a><a class="link" href="noncopyable.html#core.noncopyable.header_boost_core_noncopyable_hp.synopsis" title="Synopsis">Synopsis</a> |
| </h4></div></div></div> |
| <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> |
| <span class="special">{</span> |
| <span class="keyword">class</span> <span class="identifier">noncopyable</span><span class="special">;</span> |
| <span class="special">}</span> |
| </pre> |
| </div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h4 class="title"> |
| <a name="core.noncopyable.header_boost_core_noncopyable_hp.example"></a><a class="link" href="noncopyable.html#core.noncopyable.header_boost_core_noncopyable_hp.example" title="Example">Example</a> |
| </h4></div></div></div> |
| <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">core</span><span class="special">/</span><span class="identifier">noncopyable</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> |
| |
| <span class="keyword">class</span> <span class="identifier">X</span><span class="special">:</span> <span class="keyword">private</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">noncopyable</span> |
| <span class="special">{</span> |
| <span class="special">};</span> |
| </pre> |
| </div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h4 class="title"> |
| <a name="core.noncopyable.header_boost_core_noncopyable_hp.rationale"></a><a class="link" href="noncopyable.html#core.noncopyable.header_boost_core_noncopyable_hp.rationale" title="Rationale">Rationale</a> |
| </h4></div></div></div> |
| <p> |
| Class noncopyable has protected constructor and destructor members to emphasize |
| that it is to be used only as a base class. Dave Abrahams notes concern |
| about the effect on compiler optimization of adding (even trivial inline) |
| destructor declarations. He says: |
| </p> |
| <p> |
| <span class="quote">“<span class="quote">Probably this concern is misplaced, because <code class="computeroutput"><span class="identifier">noncopyable</span></code> |
| will be used mostly for classes which own resources and thus have non-trivial |
| destruction semantics.</span>”</span> |
| </p> |
| <p> |
| With C++2011, using an optimized and trivial constructor and similar destructor |
| can be enforced by declaring both and marking them <code class="computeroutput"><span class="keyword">default</span></code>. |
| This is done in the current implementation. |
| </p> |
| </div> |
| </div> |
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| <td align="right"><div class="copyright-footer">Copyright © 2014 Peter Dimov<br>Copyright © 2014 Glen Fernandes<br>Copyright © 2014 Andrey Semashev<p> |
| Distributed under the <a href="http://boost.org/LICENSE_1_0.txt" target="_top">Boost |
| Software License, Version 1.0</a>. |
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