74 lines
6.4 KiB
HTML
74 lines
6.4 KiB
HTML
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<title>std::experimental::ranges::CopyConstructible</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_experimental_ranges_concepts_CopyConstructible 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::experimental::ranges::</span>CopyConstructible</h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-experimental.html">experimental</a>‎ | <a href="cpp-experimental-ranges.html">ranges</a></span></div>
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<div>定义于头文件 <code><a href="cpp-header-experimental-ranges-concepts.html"><experimental/ranges/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 <span class="kw4">bool</span> CopyConstructible <span class="sy1">=</span><br />
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<a href="cpp-experimental-ranges-concepts-MoveConstructible.html"><span class="kw2550">ranges::<span class="me2">MoveConstructible</span></span></a><span class="sy1"><</span>T<span class="sy1">></span> <span class="sy3">&&</span><br />
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<a href="cpp-experimental-ranges-concepts-Constructible.html"><span class="kw2548">ranges::<span class="me2">Constructible</span></span></a><span class="sy1"><</span>T, T<span class="sy3">&</span><span class="sy1">></span> <span class="sy3">&&</span> <a href="cpp-experimental-ranges-concepts-ConvertibleTo.html"><span class="kw2532">ranges::<span class="me2">ConvertibleTo</span></span></a><span class="sy1"><</span>T<span class="sy3">&</span>, T<span class="sy1">></span> <span class="sy3">&&</span><br />
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<a href="cpp-experimental-ranges-concepts-Constructible.html"><span class="kw2548">ranges::<span class="me2">Constructible</span></span></a><span class="sy1"><</span>T, <span class="kw4">const</span> T<span class="sy3">&</span><span class="sy1">></span> <span class="sy3">&&</span> <a href="cpp-experimental-ranges-concepts-ConvertibleTo.html"><span class="kw2532">ranges::<span class="me2">ConvertibleTo</span></span></a><span class="sy1"><</span><span class="kw4">const</span> T<span class="sy3">&</span>, T<span class="sy1">></span> <span class="sy3">&&</span><br /></p>
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<a href="cpp-experimental-ranges-concepts-Constructible.html"><span class="kw2548">ranges::<span class="me2">Constructible</span></span></a><span class="sy1"><</span>T, <span class="kw4">const</span> T<span class="sy1">></span> <span class="sy3">&&</span> <a href="cpp-experimental-ranges-concepts-ConvertibleTo.html"><span class="kw2532">ranges::<span class="me2">ConvertibleTo</span></span></a><span class="sy1"><</span><span class="kw4">const</span> T, T<span class="sy1">></span><span class="sy4">;</span></div>
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<td><span class="t-mark-rev t-since-ranges-ts t-mark-ts">(范围 TS)</span></td>
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<p>概念<code>CopyConstructible</code> 得到满足，若 <code>T</code> 为左值引用类型，或若它是<a href="cpp-experimental-ranges-concepts-MoveConstructible.html"><code>MoveConstructible</code></a>对象类型，其中该类型对象能在直接和复制初始化语境中，从该类型（可能为 const 的）左值或 const 右值以通常语义构造（构造副本而不更改源）。</p>
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<p>更精确而言，若 <code>T</code> 为对象类型，则 <code>CopyConstructible<T></code> 仅若满足下列条件才得到满足，给定</p>
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<li><code>v</code> ，（可为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">const</span></span></span> 的） <code>T</code> 类型左值或 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">const</span> T</span></span> 类型右值，</li>
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<p>下列为真</p>
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<li>定义 <span class="t-c"><span class="mw-geshi cpp source-cpp">T u <span class="sy1">=</span> v<span class="sy4">;</span></span></span> 后， <code>u</code> 等于 <code>v</code> ；</li>
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<li><code>T{v}</code> 等于 <code>v</code> 。</li>
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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-types-is_copy_constructible.html"><span class="t-lines"><span>is_copy_constructible</span><span>is_trivially_copy_constructible</span><span>is_nothrow_copy_constructible</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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<td>检查类型是否拥有复制构造函数<br />
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<span class="t-mark">(类模板)</span></td>
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