80 lines
3.9 KiB
HTML
80 lines
3.9 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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<head><meta http-equiv="x-ua-compatible" content="ie=edge">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<title>std::pointer_safety</title>
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<link rel="stylesheet" href="ext.css" />
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<link rel="stylesheet" href="site_modules.css" />
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</head>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_memory_gc_pointer_safety 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>pointer_safety</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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<table class="t-dcl-begin">
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<tbody>
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<tr class="t-dsc-header">
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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>
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<td></td>
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<td></td>
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<tr class="t-dcl t-since-cxx11 t-until-cxx23">
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<div><span class="mw-geshi cpp source-cpp"><span class="kw2">enum</span> <span class="kw1">class</span> pointer_safety <span class="br0">{</span><br /></span>
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<p> relaxed,<br />
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preferred,<br />
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strict<br /></p>
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<span class="br0">}</span><span class="sy4">;</span></div>
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</td>
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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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</tr>
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<tr class="t-dcl-sep">
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<td></td>
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<td></td>
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<td></td>
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<p>有作用域枚举类型 <code>pointer_safety</code> 列出 C++ 所支持的指针安全模式。</p>
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<h3><span class="mw-headline" id=".E6.9E.9A.E4.B8.BE.E5.B8.B8.E9.87.8F">枚举常量</span></h3>
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<table class="t-dsc-begin">
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<tr class="t-dsc">
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<td><code>pointer_safety::strict</code></td>
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<td>只有安全派生的指针（指向以 new 分配对象或其子对象的指针）可解引用或解分配。垃圾收集器可能活跃。</td>
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</tr>
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<tr class="t-dsc">
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<td><code>pointer_safety::preferred</code></td>
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<td>认为所有指针均合法且可以解引用或解分配。基于可达性的泄露检测器可能活跃。</td>
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</tr>
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<tr class="t-dsc">
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<td><code>pointer_safety::relaxed</code></td>
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<td>认为所有指针均合法且可以解引用或解分配。</td>
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</tr>
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</table>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<table class="t-dsc-begin">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-memory-gc-get_pointer_safety.html"><span class="t-lines"><span>get_pointer_safety</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>返回当前的指针安全模式<br />
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<span class="t-mark">(函数)</span></td>
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</tr>
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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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