70 lines
4.1 KiB
HTML
70 lines
4.1 KiB
HTML
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<title>std::experimental::nonesuch</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_experimental_nonesuch 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::</span>nonesuch</h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-experimental.html">experimental</a></span></div>
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<div>定义于头文件 <code><a href="https://zh.cppreference.com/mwiki/index.php?title=cpp/header/experimental/type_traits&action=edit&redlink=1" class="new" title="cpp/header/experimental/type traits（页面不存在）"><experimental/type_traits></a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">struct</span> nonesuch <span class="br0">{</span><br /></span>
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<p> ~nonesuch<span class="br0">(</span><span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span><br />
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nonesuch<span class="br0">(</span>nonesuch <span class="kw4">const</span><span class="sy3">&</span><span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span><br />
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<span class="kw4">void</span> operator<span class="sy1">=</span><span class="br0">(</span>nonesuch <span class="kw4">const</span><span class="sy3">&</span><span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span><br /></p>
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<span class="br0">}</span><span class="sy4">;</span></div>
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<td><span class="t-mark-rev t-since-libfund-ts-2 t-mark-ts">(库基础 TS v2)</span></td>
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<p><code>std::experimental::nonesuch</code> 是 <a href="cpp-experimental-is_detected.html"><tt>std::experimental::detected_t</tt></a> 用以指示检测失败的类类型。</p>
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<p><code>nonesuch</code> 无默认构造函数或 intializer_list 构造函数，且非聚合体。</p>
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<h3><span class="mw-headline" id=".E6.B3.A8.E6.84.8F">注意</span></h3>
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<p>不能构造、析构或销毁 <code>nonesuch</code> 。</p>
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<h3><span class="mw-headline" id=".E7.BC.BA.E9.99.B7.E6.8A.A5.E5.91.8A">缺陷报告</span></h3>
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<p>下列更改行为的缺陷报告追溯地应用于以前出版的 C++ 标准。</p>
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<table class="dsctable" style="font-size:0.8em">
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<th>DR</th>
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<th>应用于</th>
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<th>出版时的行为</th>
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<th>正确行为</th>
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<td><a rel="nofollow" class="external text" href="https://cplusplus.github.io/LWG/issue2960">LWG 2960</a></td>
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<td>LFTSv2</td>
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<td><code>nonesuch</code> 可为聚合体并拥有源自 <code>{}</code> 的隐式转换序列</td>
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<td>使之为非聚合体并移除 ICS</td>
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