120 lines
9.7 KiB
HTML
120 lines
9.7 KiB
HTML
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<title>operator==,!=,<,<=,>,>=,<=>(std::thread::id)</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_thread_thread_id_operator_cmp skin-cppreference2 action-view cpp-navbar">
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<h1 id="firstHeading" class="firstHeading">operator==,!=,<,<=,>,>=,<=><span style="font-size:0.7em; line-height:130%">(std::thread::id)</span></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-thread.html">thread</a>‎ | <a href="cpp-thread-thread.html">thread</a>‎ | <a href="cpp-thread-thread-id.html">id</a></span></div>
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<div>定义于头文件 <code><a href="cpp-header-thread.html"><thread></a></code></div>
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<td></td>
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<td></td>
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<tr class="t-dcl t-since-cxx11">
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">bool</span> operator<span class="sy1">==</span><span class="br0">(</span> <a href="cpp-thread-thread-id.html"><span class="kw2147">std::<span class="me2">thread</span><span class="sy4">::</span><span class="me2">id</span></span></a> lhs, <a href="cpp-thread-thread-id.html"><span class="kw2147">std::<span class="me2">thread</span><span class="sy4">::</span><span class="me2">id</span></span></a> rhs <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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</td>
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<td>(1)</td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<tr class="t-dcl t-since-cxx11 t-until-cxx20">
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">bool</span> operator<span class="sy3">!</span><span class="sy1">=</span><span class="br0">(</span> <a href="cpp-thread-thread-id.html"><span class="kw2147">std::<span class="me2">thread</span><span class="sy4">::</span><span class="me2">id</span></span></a> lhs, <a href="cpp-thread-thread-id.html"><span class="kw2147">std::<span class="me2">thread</span><span class="sy4">::</span><span class="me2">id</span></span></a> rhs <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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</td>
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<td>(2)</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-cxx20">(C++20 前)</span></td>
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</tr>
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<tr class="t-dcl t-since-cxx11 t-until-cxx20">
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">bool</span> operator<span class="sy1"><</span> <span class="br0">(</span> <a href="cpp-thread-thread-id.html"><span class="kw2147">std::<span class="me2">thread</span><span class="sy4">::</span><span class="me2">id</span></span></a> lhs, <a href="cpp-thread-thread-id.html"><span class="kw2147">std::<span class="me2">thread</span><span class="sy4">::</span><span class="me2">id</span></span></a> rhs <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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</td>
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<td>(3)</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-cxx20">(C++20 前)</span></td>
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</tr>
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<tr class="t-dcl t-since-cxx11 t-until-cxx20">
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">bool</span> operator<span class="sy1"><=</span><span class="br0">(</span> <a href="cpp-thread-thread-id.html"><span class="kw2147">std::<span class="me2">thread</span><span class="sy4">::</span><span class="me2">id</span></span></a> lhs, <a href="cpp-thread-thread-id.html"><span class="kw2147">std::<span class="me2">thread</span><span class="sy4">::</span><span class="me2">id</span></span></a> rhs <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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</td>
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<td>(4)</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-cxx20">(C++20 前)</span></td>
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</tr>
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<tr class="t-dcl t-since-cxx11 t-until-cxx20">
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">bool</span> operator<span class="sy1">></span> <span class="br0">(</span> <a href="cpp-thread-thread-id.html"><span class="kw2147">std::<span class="me2">thread</span><span class="sy4">::</span><span class="me2">id</span></span></a> lhs, <a href="cpp-thread-thread-id.html"><span class="kw2147">std::<span class="me2">thread</span><span class="sy4">::</span><span class="me2">id</span></span></a> rhs <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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</td>
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<td>(5)</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-cxx20">(C++20 前)</span></td>
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</tr>
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<tr class="t-dcl t-since-cxx11 t-until-cxx20">
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">bool</span> operator<span class="sy1">>=</span><span class="br0">(</span> <a href="cpp-thread-thread-id.html"><span class="kw2147">std::<span class="me2">thread</span><span class="sy4">::</span><span class="me2">id</span></span></a> lhs, <a href="cpp-thread-thread-id.html"><span class="kw2147">std::<span class="me2">thread</span><span class="sy4">::</span><span class="me2">id</span></span></a> rhs <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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</td>
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<td>(6)</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-cxx20">(C++20 前)</span></td>
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</tr>
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<tr class="t-dcl t-since-cxx20">
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<div><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">strong_ordering</span> operator<span class="sy1"><=></span><span class="br0">(</span> <a href="cpp-thread-thread-id.html"><span class="kw2147">std::<span class="me2">thread</span><span class="sy4">::</span><span class="me2">id</span></span></a> lhs,<br />
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<a href="cpp-thread-thread-id.html"><span class="kw2147">std::<span class="me2">thread</span><span class="sy4">::</span><span class="me2">id</span></span></a> rhs <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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</td>
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<td>(7)</td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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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>比较二个线程标识符。</p>
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<div class="t-li1"><span class="t-li">1-2)</span> 检查 <code>lhs</code> 与 <code>rhs</code> 是否表示同一线程或均不表示线程。</div>
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<div class="t-li1"><span class="t-li">3-7)</span> 以未指明的全序比较 <code>lhs</code> 与 <code>rhs</code> 。</div>
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<table class="t-rev-begin">
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<tr class="t-rev t-since-cxx20">
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<p><code><</code>、 <code><=</code>、 <code>></code>、 <code>>=</code> 及 <code>!=</code> 运算符分别从 <code>operator<=></code> 与 <code>operator==</code> <a href="cpp-language-operators.html#.E5.85.B3.E7.B3.BB.E8.BF.90.E7.AE.97.E7.AC.A6">合成</a>。</p>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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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>lhs, rhs</td>
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<td>-</td>
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<td>要比较的线程标识符</td>
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</tr>
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</table>
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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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<div class="t-li1"><span class="t-li">1-6)</span> 若对应关系成立则为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> ，否则为 <code>false</code> 。</div>
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<div class="t-li1"><span class="t-li">7)</span> 若在该全序中 <code>lhs</code> 小于 <code>rhs</code> 则为 <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">strong_ordering</span><span class="sy4">::</span><span class="me2">less</span></span></span> ；否则若在该全序中 <code>rhs</code> 小于 <code>lhs</code> 则为 <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">strong_ordering</span><span class="sy4">::</span><span class="me2">greater</span></span></span> ；否则为 <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">strong_ordering</span><span class="sy4">::</span><span class="me2">equal</span></span></span> 。</div>
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<h3><span class="mw-headline" id=".E5.A4.8D.E6.9D.82.E5.BA.A6">复杂度</span></h3>
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<p>常数。</p>
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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"></table>
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