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<title>std::atomic_flag_test, std::atomic_flag_test_explicit</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>atomic_flag_test, <span style="font-size:0.7em; line-height:130%">std::</span>atomic_flag_test_explicit</h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-atomic.html">atomic</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code><a href="cpp-header-atomic.html">&lt;atomic&gt;</a></code></div>
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<td rowspan="142">(1)</td>
<td rowspan="142"><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">bool</span> atomic_flag_test<span class="br0">(</span> <span class="kw4">const</span> <span class="kw4">volatile</span> <a href="cpp-atomic-atomic_flag.html"><span class="kw2088">std::<span class="me2">atomic_flag</span></span></a><span class="sy2">*</span> object <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">bool</span> atomic_flag_test<span class="br0">(</span> <span class="kw4">const</span> <a href="cpp-atomic-atomic_flag.html"><span class="kw2088">std::<span class="me2">atomic_flag</span></span></a><span class="sy2">*</span> object <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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<td rowspan="142">(2)</td>
<td rowspan="142"><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">bool</span> atomic_flag_test_explicit<span class="br0">(</span> <span class="kw4">const</span> <span class="kw4">volatile</span> <a href="cpp-atomic-atomic_flag.html"><span class="kw2088">std::<span class="me2">atomic_flag</span></span></a><span class="sy2">*</span> object,<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <a href="cpp-atomic-memory_order.html"><span class="kw2092">std::<span class="me2">memory_order</span></span></a> order <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">bool</span> atomic_flag_test_explicit<span class="br0">(</span> <span class="kw4">const</span> <a href="cpp-atomic-atomic_flag.html"><span class="kw2088">std::<span class="me2">atomic_flag</span></span></a><span class="sy2">*</span> object,<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <a href="cpp-atomic-memory_order.html"><span class="kw2092">std::<span class="me2">memory_order</span></span></a> order <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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<p>&#21407;&#23376;&#22320;&#35835;&#21462; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>object</span></span> &#30340;&#20540;&#24182;&#36820;&#22238;&#35813;&#20540;&#12290;</p>
<div class="t-li1"><span class="t-li">1)</span> &#31561;&#20215;&#20110; <span class="t-c"><span class="mw-geshi cpp source-cpp">object<span class="sy2">-</span><span class="sy1">&gt;</span>test<span class="br0">(</span><a href="cpp-atomic-memory_order.html"><span class="kw2098">std::<span class="me2">memory_order_seq_cst</span></span></a><span class="br0">)</span></span></span> &#12290;</div>
<div class="t-li1"><span class="t-li">2)</span> &#31561;&#20215;&#20110; <span class="t-c"><span class="mw-geshi cpp source-cpp">object<span class="sy2">-</span><span class="sy1">&gt;</span>test<span class="br0">(</span>order<span class="br0">)</span></span></span> &#12290;</div>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
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<td>object</td>
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<td>&#25351;&#21521;&#35201;&#35835;&#21462;&#30340; <code>atomic_flag</code> &#23545;&#35937;&#30340;&#25351;&#38024;</td>
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<td>order</td>
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<td>&#27492;&#25805;&#20316;&#20351;&#29992;&#30340;&#20869;&#23384;&#21516;&#27493;&#39034;&#24207;&#65306;&#24517;&#39035;&#19981;&#20026; <span class="t-lc">std::memory_order::release</span> &#25110; <span class="t-lc">std::memory_order::acq_rel</span></td>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<p>&#21407;&#23376;&#22320;&#35835;&#21462;&#30340;&#20540;&#12290;</p>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
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<td class="mbox-text" style="">&#26412;&#33410;&#26410;&#23436;&#25104;<br />
&#21407;&#22240;&#65306;&#26242;&#26080;&#31034;&#20363;</td>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">&#21442;&#38405;</span></h3>
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<div><a href="cpp-atomic-atomic_flag-test.html"><span class="t-lines"><span>test</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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<td>&#21407;&#23376;&#22320;&#36820;&#22238;&#26631;&#24535;&#30340;&#20540;<br />
<span class="t-mark">(<code>std::atomic_flag</code> &#30340;&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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