114 lines
6.6 KiB
HTML
114 lines
6.6 KiB
HTML
<!DOCTYPE html>
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<html lang="zh" dir="ltr" class="client-nojs" xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<title>std::allocation_result</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_memory_allocation_result skin-cppreference2 action-view cpp-navbar">
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<div id="cpp-content-base">
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<div id="content"><a id="top"></a>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>allocation_result</h1>
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<div id="bodyContent">
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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 id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
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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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<td></td>
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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> Pointer <span class="sy1">></span><br /></span>
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<p><span class="kw1">struct</span> allocation_result <span class="br0">{</span><br />
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Pointer ptr<span class="sy4">;</span><br />
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<a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> count<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-cxx23">(C++23 起)</span></td>
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<p><code>allocation_result</code> 特化是适合的<a href="cpp-named_req-Allocator.html"><span style="font-style:italic">分配器</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(Allocator)</span></a> 类型的 <code>allocate_at_least</code> 成员函数（例如 <a href="cpp-memory-allocator-allocate_at_least.html"><tt>std::allocator::allocate_at_least</tt></a> ）及 <a href="cpp-memory-allocate_at_least.html"><tt>std::allocate_at_least</tt></a> 的返回类型。</p>
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<p><code>allocation_result</code> 的每个特化均无基类或 <code>ptr</code> 与 <code>count</code> 之外的声明成员，从而它适合<a href="cpp-language-aggregate_initialization.html">聚合初始化</a>及<a href="cpp-language-structured_binding.html">结构化绑定</a>。</p>
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<h3><span class="mw-headline" id=".E6.A8.A1.E6.9D.BF.E5.BD.A2.E5.8F.82">模板形参</span></h3>
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<table class="t-par-begin">
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<tr class="t-par">
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<td>Pointer</td>
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<td>-</td>
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<td>常为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-memory-allocator_traits.html"><span class="kw701">std::<span class="me2">allocator_traits</span></span></a><span class="sy1"><</span>Alloc<span class="sy1">></span><span class="sy4">::</span><span class="me2">pointer</span></span></span> ，其中 <code>Alloc</code> 为<a href="cpp-named_req-Allocator.html"><span style="font-style:italic">分配器</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(Allocator)</span></a> 类型</td>
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</table>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.AF.B9.E8.B1.A1">成员对象</span></h3>
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<div><span class="t-lines"><span>ptr</span></span></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx23">(C++23)</span></span></span></div>
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</td>
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<td>常用于 <code>allocate_at_least</code> 所分配的存储中首元素的地址<br />
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<span class="t-mark">(公开成员对象)</span></td>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><span class="t-lines"><span>count</span></span></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx23">(C++23)</span></span></span></div>
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</td>
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<td>常用于 <code>allocate_at_least</code> 所分配的存储中的实际元素数<br />
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<span class="t-mark">(公开成员对象)</span></td>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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<td class="mbox-text" style="">本节未完成<br />
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原因：暂无示例</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-allocate_at_least.html"><span class="t-lines"><span>allocate_at_least</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx23">(C++23)</span></span></span></div>
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</div>
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</td>
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<td>分配与请求的大小至少一样大的未初始化存储<br />
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<span class="t-mark">(<code>std::allocator<T></code> 的公开成员函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-memory-allocate_at_least.html"><span class="t-lines"><span>allocate_at_least</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx23">(C++23)</span></span></span></div>
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</div>
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</td>
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<td>经由分配器分配至少与请求的大小一样大的存储<br />
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<span class="t-mark">(函数模板)</span></td>
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</table>
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</div>
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<div class="visualClear"></div>
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</body>
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