86 lines
4.6 KiB
HTML
86 lines
4.6 KiB
HTML
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>allocator_arg_t</h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-memory.html">memory</a></span></div>
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<div>定义于头文件 <code><a href="cpp-header-memory.html"><memory></a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">struct</span> allocator_arg_t <span class="br0">{</span> <span class="kw1">explicit</span> allocator_arg_t<span class="br0">(</span><span class="br0">)</span> <span class="sy1">=</span> <span class="kw1">default</span><span class="sy4">;</span> <span class="br0">}</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<p><code>std::allocator_arg_t</code> 是用于消歧义具分配器对象，包括 <span class="t-lc"><a href="cpp-utility-tuple.html">std::tuple</a></span> <span class="t-rev-inl t-until-cxx17"><span>、 <span class="t-lc"><a href="cpp-utility-functional-function.html">std::function</a></span> 、 <span class="t-lc"><a href="cpp-thread-packaged_task.html">std::packaged_task</a></span></span> <span><span class="t-mark-rev t-until-cxx17">(C++17 前)</span></span></span>与 <span class="t-lc"><a href="cpp-thread-promise.html">std::promise</a></span> 的构造函数和成员函数的空类类型。</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/issue2510">LWG 2510</a></td>
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<td>C++11</td>
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<td>默认构造函数为非 explicit ，能导致歧义</td>
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<td>使之为 explicit</td>
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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 class="t-dsc-member-div">
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<div><a href="cpp-memory-allocator_arg.html"><span class="t-lines"><span>allocator_arg</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></div>
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</div>
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</td>
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<td>用于选择具分配器的构造函数的 <span class="t-lc"><strong class="selflink">std::allocator_arg_t</strong></span> 对象<br />
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<span class="t-mark">(常量)</span></td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-memory-uses_allocator.html"><span class="t-lines"><span>uses_allocator</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></div>
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</div>
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</td>
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<td>检查指定的类型是否支持使用分配器的构造<br />
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<span class="t-mark">(类模板)</span></td>
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