70 lines
3.7 KiB
HTML
70 lines
3.7 KiB
HTML
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<title>std::experimental::ranges::DefaultConstructible</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_experimental_ranges_concepts_DefaultConstructible 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>DefaultConstructible</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 />
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concept <span class="kw4">bool</span> DefaultConstructible <span class="sy1">=</span> <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="sy1">></span><span class="sy4">;</span></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><code>DefaultConstructible</code> 概念为问题为能否以无参数构造类型时的常见情况提供快捷方式。</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-experimental-ranges-concepts-Constructible.html"><span class="t-lines"><span>Constructible</span></span></a></div>
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<td>指定该类型的变量能从一组实参类型进行构造，或绑定到一组实参类型<br />
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<span class="t-mark">(概念)</span></td>
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<div><a href="cpp-types-is_default_constructible.html"><span class="t-lines"><span>is_default_constructible</span><span>is_trivially_default_constructible</span><span>is_nothrow_default_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>检查类型是否有默认构造函数<br />
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<span class="t-mark">(类模板)</span></td>
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