232 lines
11 KiB
HTML
232 lines
11 KiB
HTML
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<title>std::experimental::observer_ptr</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_experimental_observer_ptr 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::experimental::</span>observer_ptr</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-experimental.html">experimental</a></span></div>
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<div>定义于头文件 <code><a href="https://zh.cppreference.com/mwiki/index.php?title=cpp/header/experimental/memory&action=edit&redlink=1" class="new" title="cpp/header/experimental/memory（页面不存在）"><experimental/memory></a></code></div>
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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> W <span class="sy1">></span><br />
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<span class="kw1">class</span> observer_ptr<span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-libfund-ts-2 t-mark-ts">(库基础 TS v2)</span></td>
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<p><code>std::experimental::observer_ptr</code> 是非占有指针，或<i>观察器</i>。观察器存储指向称为<i>被查看对象</i>的第二对象的指针。 <code>observer_ptr</code> 亦可无被查看对象。</p>
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<p>观察器不以任何方式负责被查看对象；观察器与其所查看的对象间无固有关系。</p>
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<p>它是有意被用作裸指针类型的接近偶然的替换，优点是作为词汇类型，它指示其有意使用，而无需读代码者的详细分析。</p>
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<p><code>observer_ptr</code> 的特化满足<a href="cpp-named_req-CopyConstructible.html"><span style="font-style:italic">可复制构造</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(CopyConstructible)</span></a> 和<a href="cpp-named_req-CopyAssignable.html"><span style="font-style:italic">可复制赋值</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(CopyAssignable)</span></a> 的要求。</p>
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<table class="t-par-begin">
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<tr class="t-par-hitem">
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<td colspan="3">类型要求</td>
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<tr class="t-par-req">
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<td colspan="3">-
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<div class="spacer"></div>
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<code>W</code> 不应为引用类型，但可为不完整类型。</td>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E7.B1.BB.E5.9E.8B">成员类型</span></h3>
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<table class="t-dsc-begin">
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<td>成员类型</td>
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<td>定义</td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">element_type</span></span></td>
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<td><code>W</code> ，此 <code>observer_ptr</code> 所查看的对象类型</td>
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</table>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">成员函数</span></h3>
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<div class="t-dsc-member-div t-dsc-member-nobold-div">
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<div><a href="cpp-experimental-observer_ptr-observer_ptr.html"><span class="t-lines"><span>(构造函数)</span></span></a></div>
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</div>
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</td>
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<td>构造新的 <code>observer_ptr</code><br />
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<span class="t-mark">(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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<div class="t-dsc-member-div t-dsc-member-nobold-div">
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<div><span class="t-lines"><span>(析构函数)</span></span></div>
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<div><span class="t-lines"><span><span class="t-mark">(隐式声明)</span></span></span></div>
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</div>
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</td>
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<td>销毁 <code>observer_ptr</code><br />
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<span class="t-mark">(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><span class="t-lines"><span>operator=</span></span></div>
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<div><span class="t-lines"><span><span class="t-mark">(隐式声明)</span></span></span></div>
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</div>
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</td>
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<td>隐式声明的复制和移动赋值运算符，赋值存储的指针<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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<tr>
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<td colspan="2">
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<h5><span class="mw-headline" id=".E4.BF.AE.E6.94.B9.E5.99.A8">修改器</span></h5>
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</td>
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-experimental-observer_ptr-release.html"><span class="t-lines"><span>release</span></span></a></div>
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</div>
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</td>
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<td>返回指向被查看对象的指针并停止查看对象<br />
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<span class="t-mark">(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-experimental-observer_ptr-reset.html"><span class="t-lines"><span>reset</span></span></a></div>
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</div>
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</td>
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<td>替换被查看对象<br />
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<span class="t-mark">(公开成员函数)</span></td>
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<tr class="t-dsc">
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<div class="t-dsc-member-div">
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<div><a href="cpp-experimental-observer_ptr-swap.html"><span class="t-lines"><span>swap</span></span></a></div>
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</div>
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</td>
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<td>交换所查看的对象<br />
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<span class="t-mark">(公开成员函数)</span></td>
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<td colspan="2">
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<h5><span class="mw-headline" id=".E8.A7.82.E5.AF.9F.E5.99.A8">观察器</span></h5>
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</td>
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<tr class="t-dsc">
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<div class="t-dsc-member-div">
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<div><a href="cpp-experimental-observer_ptr-get.html"><span class="t-lines"><span>get</span></span></a></div>
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</div>
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</td>
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<td>返回指向被查看对象的指针<br />
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<span class="t-mark">(公开成员函数)</span></td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-experimental-observer_ptr-operator_bool.html"><span class="t-lines"><span>operator bool</span></span></a></div>
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</div>
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</td>
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<td>检查是否有关联的被查看对象<br />
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<span class="t-mark">(公开成员函数)</span></td>
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<tr class="t-dsc">
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<div class="t-dsc-member-div">
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<div><a href="cpp-experimental-observer_ptr-operator*.html"><span class="t-lines"><span>operator*</span><span>operator-></span></span></a></div>
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</div>
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</td>
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<td>解引用指向被查看对象的指针<br />
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<span class="t-mark">(公开成员函数)</span></td>
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<td colspan="2">
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<h5><span class="mw-headline" id=".E8.BD.AC.E6.8D.A2">转换</span></h5>
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<div class="t-dsc-member-div">
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<div><a href="cpp-experimental-observer_ptr-operator_pointer.html"><span class="t-lines"><span>operator element_type*</span></span></a></div>
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</div>
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</td>
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<td>到被存储指针的显式转换函数<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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</table>
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<h3><span class="mw-headline" id=".E9.9D.9E.E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">非成员函数</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-experimental-observer_ptr-make_observer.html"><span class="t-lines"><span>make_observer</span></span></a></div>
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</div>
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</td>
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<td>创建查看对象的 <code>observer_ptr</code><br />
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<span class="t-mark">(函数模板)</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><a href="cpp-experimental-observer_ptr-operator_cmp.html"><span class="t-lines"><span>operator==</span><span>operator!=</span><span>operator<</span><span>operator<=</span><span>operator></span><span>operator>=</span></span></a></div>
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</div>
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</td>
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<td>与另一 <code>observer_ptr</code> 或 <span class="t-c"><span class="mw-geshi cpp source-cpp">nullptr</span></span> 比较<br />
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<span class="t-mark">(函数模板)</span></td>
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</tr>
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<tr class="t-dsc">
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<div class="t-dsc-member-div">
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<div><a href="cpp-experimental-observer_ptr-swap2.html"><span class="t-lines"><span>std::experimental::swap<span class="t-dsc-small">(std::experimental::observer_ptr)</span></span></span></a></div>
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</div>
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</td>
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<td>特化 <code>swap</code> 算法<br />
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<span class="t-mark">(函数模板)</span></td>
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</tr>
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</table>
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<h3><span class="mw-headline" id=".E8.BE.85.E5.8A.A9.E7.B1.BB">辅助类</span></h3>
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<table class="t-dsc-begin">
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<div class="t-dsc-member-div">
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<div><a href="cpp-experimental-observer_ptr-hash.html"><span class="t-lines"><span>std::hash<span class="t-dsc-small"><std::experimental::observer_ptr></span></span></span></a></div>
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</div>
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</td>
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<td><code>observer_ptr</code> 的哈希支持<br />
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<span class="t-mark">(类模板特化)</span></td>
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</tr>
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</table>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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<table class="metadata plainlinks ambox mbox-small-left ambox-notice" style="">
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<td class="mbox-empty-cell"></td>
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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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</tr>
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</table>
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</div>
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<div class="visualClear"></div>
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</div>
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