82 lines
4.5 KiB
HTML
82 lines
4.5 KiB
HTML
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<title>std::allocator_arg</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_memory_allocator_arg 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>allocator_arg</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="kw4">constexpr</span> <a href="cpp-memory-allocator_arg_t.html"><span class="kw702">std::<span class="me2">allocator_arg_t</span></span></a> allocator_arg <span class="sy1">=</span> <a href="cpp-memory-allocator_arg_t.html"><span class="kw702">std::<span class="me2">allocator_arg_t</span></span></a><span class="br0">(</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><br />
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<span class="t-mark-rev t-until-cxx17">(C++17 前)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">inline</span> <span class="kw4">constexpr</span> <a href="cpp-memory-allocator_arg_t.html"><span class="kw702">std::<span class="me2">allocator_arg_t</span></span></a> allocator_arg <span class="sy1">=</span> <a href="cpp-memory-allocator_arg_t.html"><span class="kw702">std::<span class="me2">allocator_arg_t</span></span></a><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></td>
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<p><code>std::allocator_arg</code> 是 <span class="t-lc"><a href="cpp-memory-allocator_arg_t.html">std::allocator_arg_t</a></span> 类型常量，用于在调用点消歧义具分配器对象，例如 <span class="t-lc"><a href="cpp-utility-tuple.html">std::tuple</a></span> 、 <span class="t-lc"><a href="cpp-utility-functional-function.html">std::function</a></span> 、 <span class="t-lc"><a href="cpp-thread-promise.html">std::promise</a></span> 与 <span class="t-lc"><a href="cpp-thread-packaged_task.html">std::packaged_task</a></span> 的构造函数及成员函数的重载。</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 class="t-dsc-member-div">
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<div><a href="cpp-memory-allocator_arg_t.html"><span class="t-lines"><span>allocator_arg_t</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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</td>
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<td>标签类型，用于选择具分配器的构造函数重载<br />
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<span class="t-mark">(类)</span></td>
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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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</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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