69 lines
5.4 KiB
HTML
69 lines
5.4 KiB
HTML
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<title>std::hash(std::experimental::observer_ptr)</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_experimental_observer_ptr_hash 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>hash<small>(std::experimental::observer_ptr)</small></h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-experimental.html">experimental</a>‎ | <a href="cpp-experimental-observer_ptr.html">observer ptr</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> T<span class="sy1">></span> <span class="kw1">struct</span> hash<span class="sy1"><</span><a href="cpp-experimental-observer_ptr.html"><span class="kw2425">std::<span class="me2">experimental</span><span class="sy4">::</span><span class="me2">observer_ptr</span></span></a><span class="sy1"><</span>T<span class="sy1">>></span><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><span class="t-lc"><a href="cpp-utility-hash.html">std::hash</a></span> 对 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-experimental-observer_ptr.html"><span class="kw2425">std::<span class="me2">experimental</span><span class="sy4">::</span><span class="me2">observer_ptr</span></span></a><span class="sy1"><</span>T<span class="sy1">></span></span></span> 的模板特化允许用户获得 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-experimental-observer_ptr.html"><span class="kw2425">std::<span class="me2">experimental</span><span class="sy4">::</span><span class="me2">observer_ptr</span></span></a><span class="sy1"><</span>T<span class="sy1">></span></span></span> 类型对象的哈希。</p>
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<p>对于给定的 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-experimental-observer_ptr.html"><span class="kw2425">std::<span class="me2">experimental</span><span class="sy4">::</span><span class="me2">observer_ptr</span></span></a><span class="sy1"><</span>T<span class="sy1">></span> p</span></span> ，此特化确保 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-utility-hash.html"><span class="kw1124">std::<span class="me2">hash</span></span></a><span class="sy1"><</span><a href="cpp-experimental-observer_ptr.html"><span class="kw2425">std::<span class="me2">experimental</span><span class="sy4">::</span><span class="me2">observer_ptr</span></span></a><span class="sy1"><</span>T<span class="sy1">>></span><span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>p<span class="br0">)</span> <span class="sy1">==</span> <a href="cpp-utility-hash.html"><span class="kw1124">std::<span class="me2">hash</span></span></a><span class="sy1"><</span>T<span class="sy2">*</span><span class="sy1">></span><span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>p.<span class="me1">get</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span></span></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-utility-hash.html"><span class="t-lines"><span>hash</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></span></div>
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<td>散列函数对象<br />
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<span class="t-mark">(类模板)</span></td>
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