155 lines
9.0 KiB
HTML
155 lines
9.0 KiB
HTML
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<title>std::pmr::unsynchronized_pool_resource</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_memory_unsynchronized_pool_resource 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::pmr::</span>unsynchronized_pool_resource</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_resource.html"><memory_resource></a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">class</span> unsynchronized_pool_resource <span class="sy4">:</span> <span class="kw1">public</span> <a href="cpp-memory-memory_resource.html"><span class="kw708">std::<span class="me2">pmr</span><span class="sy4">::</span><span class="me2">memory_resource</span></span></a><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>类 <code>std::pmr::unsynchronized_pool_resource</code> 是带下列属性的通用内存资源类：</p>
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<li>它占有被分配内存并在析构时释放它，即使 <code>deallocate</code> 未被对于某些被分配块调用。</li>
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<li>它由供应不同块大小请求的<i>池</i>的汇集组成。每个池管理之后被分入一致大小的<i>大块</i>的汇集。</li>
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<li>对 <a href="cpp-memory-unsynchronized_pool_resource-do_allocate.html"><tt>do_allocate</tt></a> 的调用被派发到供应适应请求大小的最小块的池。</li>
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<li>在池中耗尽内存，会导致该池从<i>上游分配器</i>分配额外的内存大块，以填满池。获取的大块大小以几何级数增加。</li>
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<li>请求超出最大的块大小的分配，由<i>上游分配器</i>直接供应。</li>
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<li>最大的块大小和大块大小的最大值可通过传递 <span class="t-lc"><a href="cpp-memory-pool_options.html">std::pmr::pool_options</a></span> 结构体给其构造函数调节。</li>
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<p><code>unsynchronized_pool_resource</code> 不是线程安全的，而且不能从多个线程同时访问；若要求从多个线程访问则应使用 <a href="cpp-memory-synchronized_pool_resource.html"><tt>synchronized_pool_resource</tt></a> 。</p>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">成员函数</span></h3>
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<div><a href="cpp-memory-unsynchronized_pool_resource-unsynchronized_pool_resource.html"><span class="t-lines"><span>(构造函数)</span></span></a></div>
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<td>构造 <code>unsynchronized_pool_resource</code><br />
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<span class="t-mark">(公开成员函数)</span></td>
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<div><a href="cpp-memory-unsynchronized_pool_resource-~unsynchronized_pool_resource.html"><span class="t-lines"><span>(析构函数)</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-cmark">[虚]</span></span></span></div>
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<td>销毁 <code>unsynchronized_pool_resource</code> ，释放所有分配的内存<br />
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<span class="t-mark">(虚公开成员函数)</span></td>
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<div><span class="t-lines"><span>operator=</span></span></div>
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<div><span class="t-lines"><span><span class="t-cmark">[被删除]</span></span></span></div>
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<td>复制赋值运算符被删除， <code>unsynchronized_pool_resource</code> 不可复制赋值<br />
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<span class="t-mark">(公开成员函数)</span></td>
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<h5><span class="mw-headline" id=".E5.85.AC.E5.BC.80.E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">公开成员函数</span></h5>
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<div><a href="cpp-memory-unsynchronized_pool_resource-release.html"><span class="t-lines"><span>release</span></span></a></div>
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<td>释放所有分配的内存<br />
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<span class="t-mark">(公开成员函数)</span></td>
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<div><a href="cpp-memory-unsynchronized_pool_resource-upstream_resource.html"><span class="t-lines"><span>upstream_resource</span></span></a></div>
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<td>返回指向上游 memory_resource 的指针<br />
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<span class="t-mark">(公开成员函数)</span></td>
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<div><a href="cpp-memory-unsynchronized_pool_resource-options.html"><span class="t-lines"><span>options</span></span></a></div>
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<td>返回控制此资源分池行为的选项<br />
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<span class="t-mark">(公开成员函数)</span></td>
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<h5><span class="mw-headline" id=".E5.8F.97.E4.BF.9D.E6.8A.A4.E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">受保护成员函数</span></h5>
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<div><a href="cpp-memory-unsynchronized_pool_resource-do_allocate.html"><span class="t-lines"><span>do_allocate</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-cmark">[虚]</span></span></span></div>
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<td>分配内存<br />
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<span class="t-mark">(虚受保护成员函数)</span></td>
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<div><a href="cpp-memory-unsynchronized_pool_resource-do_deallocate.html"><span class="t-lines"><span>do_deallocate</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-cmark">[虚]</span></span></span></div>
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<td>返还内存到池<br />
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<span class="t-mark">(虚受保护成员函数)</span></td>
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<div><a href="cpp-memory-unsynchronized_pool_resource-do_is_equal.html"><span class="t-lines"><span>do_is_equal</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-cmark">[虚]</span></span></span></div>
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</td>
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<td>与另一 <span class="t-lc"><a href="cpp-memory-memory_resource.html">std::pmr::memory_resource</a></span> 比较相等<br />
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<span class="t-mark">(虚受保护成员函数)</span></td>
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