81 lines
4.7 KiB
HTML
81 lines
4.7 KiB
HTML
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<title>std::declare_reachable</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_memory_gc_declare_reachable 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>declare_reachable</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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<tbody>
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<td>
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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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<td></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">void</span> declare_reachable<span class="br0">(</span> <span class="kw4">void</span><span class="sy2">*</span> p <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td class="t-dcl-nopad"></td>
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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-cxx23">(C++23 中移除)</span></td>
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<p>声明 <code>p</code> 所引用的对象可抵达。可抵达对象将不为垃圾收集器删除，或不被泄漏检测器认为是泄露，即使所有指向它的指针都被销毁。对象可以声明为多次可抵达，该情况下会需要多次调用 <span class="t-lc"><a href="cpp-memory-gc-undeclare_reachable.html">std::undeclare_reachable</a></span> 以移除此属性。例如，若实现拥有启用的垃圾收集，则<a href="https://en.wikipedia.org/wiki/XOR_linked_list" class="extiw" title="enwiki:XOR linked list">异或链表</a>需要声明其结点为可抵达。</p>
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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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<tr class="t-par">
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<td>p</td>
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<td>-</td>
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<td>安全派生的指针或空指针</td>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
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<p>（无）</p>
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<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">异常</span></h3>
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<p>若系统不能分配追踪可抵达对象所要求的内存，则可能抛出 <span class="t-lc"><a href="cpp-memory-new-bad_alloc.html">std::bad_alloc</a></span> 。</p>
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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><a href="cpp-memory-gc-undeclare_reachable.html"><span class="t-lines"><span>undeclare_reachable</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 class="t-mark-rev t-until-cxx23">(C++23 中移除)</span></span></span></div>
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</div>
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</td>
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<td>声明一个对象可以被回收<br />
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<span class="t-mark">(函数模板)</span></td>
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