66 lines
3.6 KiB
HTML
66 lines
3.6 KiB
HTML
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<title>std::copyable</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_concepts_copyable skin-cppreference2 action-view cpp-navbar">
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>copyable</h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-concepts.html">concepts</a></span></div>
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<div>定义于头文件 <code><a href="cpp-header-concepts.html"><concepts></a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span> <span class="sy1"><</span><span class="kw1">class</span> T<span class="sy1">></span><br /></span>
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<p>concept copyable <span class="sy1">=</span><br />
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std<span class="sy4">::</span><span class="me2">copy_constructible</span><span class="sy1"><</span>T<span class="sy1">></span> <span class="sy3">&&</span><br />
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std<span class="sy4">::</span><span class="me2">movable</span><span class="sy1"><</span>T<span class="sy1">></span> <span class="sy3">&&</span><br />
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std<span class="sy4">::</span><span class="me2">assignable_from</span><span class="sy1"><</span>T<span class="sy3">&</span>, T<span class="sy3">&</span><span class="sy1">></span> <span class="sy3">&&</span><br />
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std<span class="sy4">::</span><span class="me2">assignable_from</span><span class="sy1"><</span>T<span class="sy3">&</span>, <span class="kw4">const</span> T<span class="sy3">&</span><span class="sy1">></span> <span class="sy3">&&</span><br /></p>
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std<span class="sy4">::</span><span class="me2">assignable_from</span><span class="sy1"><</span>T<span class="sy3">&</span>, <span class="kw4">const</span> T<span class="sy1">></span><span class="sy4">;</span></div>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<p>概念 <code>copyable<T></code> 指定 <code>T</code> 是亦能复制的 <a href="cpp-concepts-movable.html"><code>movable</code></a> 对象类型（即它支持移动构造和移动赋值）。</p>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<div><a href="cpp-concepts-movable.html"><span class="t-lines"><span>movable</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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<td>指定能移动及交换一个类型的对象<br />
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<span class="t-mark">(概念)</span></td>
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