111 lines
7.3 KiB
HTML
111 lines
7.3 KiB
HTML
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<title>std::pmr::monotonic_buffer_resource::monotonic_buffer_resource</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::pmr::monotonic_buffer_resource::</span>monotonic_buffer_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>‎ | <a href="cpp-memory-monotonic_buffer_resource.html">monotonic buffer resource</a></span></div>
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<div><span class="mw-geshi cpp source-cpp">monotonic_buffer_resource<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(1)</td>
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<td><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">explicit</span> monotonic_buffer_resource<span class="br0">(</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="sy2">*</span> upstream<span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(2)</td>
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<td><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">explicit</span> monotonic_buffer_resource<span class="br0">(</span><a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> initial_size<span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(3)</td>
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<td><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp">monotonic_buffer_resource<span class="br0">(</span><a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> initial_size,<br />
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<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="sy2">*</span> upstream<span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(4)</td>
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<td><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp">monotonic_buffer_resource<span class="br0">(</span><span class="kw4">void</span><span class="sy2">*</span> buffer, <a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> buffer_size<span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(5)</td>
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<td><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp">monotonic_buffer_resource<span class="br0">(</span><span class="kw4">void</span><span class="sy2">*</span> buffer, <a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> buffer_size,<br />
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<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="sy2">*</span> upstream<span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(6)</td>
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<td><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp">monotonic_buffer_resource<span class="br0">(</span><span class="kw4">const</span> monotonic_buffer_resource<span class="sy3">&</span><span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span></span></div>
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<td>(7)</td>
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<td><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></td>
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<p>构造 <code>monotonic_buffer_resource</code> 。不接收上游 memory_resource 指针的构造函数以 <span class="t-lc"><a href="cpp-memory-get_default_resource.html">std::pmr::get_default_resource</a></span> 为 memory_resource 。</p>
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<div class="t-li1"><span class="t-li">1-2)</span> 设置<i>当前缓冲区</i>为空，<i>下个缓冲区大小</i>为实现定义大小。</div>
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<div class="t-li1"><span class="t-li">3-4)</span> 设置<i>当前缓冲区</i>为空，<i>下个缓冲区大小</i>为不小于 <code>initial_size</code> 的值。</div>
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<div class="t-li1"><span class="t-li">5-6)</span> 设置<i>当前缓冲区</i>为 <code>buffer</code> ，<i>下个缓冲区大小</i>为 <code>buffer_size</code> （但不小于 1 ）。然后以实现定义的增长因子（不必是整数）增加<i>下个缓冲区大小</i>。</div>
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<div class="t-li1"><span class="t-li">7)</span> 复制构造函数被删除。</div>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
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<table class="t-par-begin">
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<td>upstream</td>
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<td>-</td>
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<td>要使用的上游内存资源；必须指向合法的 memory_resource</td>
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<td>initial_size</td>
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<td>-</td>
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<td>要分配的首个缓冲区的最小大小；必须大于零</td>
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<td>buffer</td>
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<td>-</td>
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<td>使用的初始缓冲区</td>
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<td>buffer_size</td>
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<td>-</td>
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<td>初始缓冲区的大小；不能大于 <code><b>buffer</b></code> 的字节数</td>
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