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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::jthread::</span>joinable</h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-thread.html">thread</a>&lrm; | <a href="cpp-thread-jthread.html">jthread</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="br0">[</span><span class="br0">[</span>nodiscard<span class="br0">]</span><span class="br0">]</span> <span class="kw4">bool</span> joinable<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></td>
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<p>&#26816;&#26597; <code>std::jthread</code> &#23545;&#35937;&#26159;&#21542;&#26631;&#35782;&#27963;&#36291;&#30340;&#25191;&#34892;&#32447;&#31243;&#12290;&#20855;&#20307;&#32780;&#35328;&#65292;&#33509; <span class="t-c"><span class="mw-geshi cpp source-cpp">get_id<span class="br0">(</span><span class="br0">)</span> <span class="sy3">!</span><span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">jthread</span><span class="sy4">::</span><span class="me2">id</span><span class="br0">(</span><span class="br0">)</span></span></span> &#21017;&#36820;&#22238; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> &#12290;&#25925;&#40664;&#35748;&#26500;&#36896;&#30340; jthread &#19981;&#21487;&#32467;&#21512;&#12290;</p>
<p>&#32467;&#26463;&#25191;&#34892;&#20195;&#30721;&#65292;&#20294;&#20173;&#26410;&#32467;&#21512;&#30340;&#32447;&#31243;&#20173;&#34987;&#24403;&#20316;&#27963;&#36291;&#30340;&#25191;&#34892;&#32447;&#31243;&#65292;&#20174;&#32780;&#21487;&#32467;&#21512;&#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
<p>&#65288;&#26080;&#65289;</p>
<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<p>&#33509; jthread &#23545;&#35937;&#26631;&#35782;&#27963;&#36291;&#30340;&#25191;&#34892;&#32447;&#31243;&#21017;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> &#65292;&#21542;&#21017;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span> &#12290;</p>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
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<pre class="de1"><span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;thread&gt;</span>
<span class="co2">#include &lt;chrono&gt;</span>
<span class="kw4">void</span> foo<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<a href="cpp-thread-sleep_for.html"><span class="kw2149">std::<span class="me2">this_thread</span><span class="sy4">::</span><span class="me2">sleep_for</span></span></a><span class="br0">(</span><a href="cpp-chrono-duration.html"><span class="kw997">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">seconds</span></span></a><span class="br0">(</span><span class="nu0">1</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
std<span class="sy4">::</span><span class="me2">jthread</span> t<span class="sy4">;</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;before starting, joinable: &quot;</span> <span class="sy1">&lt;&lt;</span> <a href="cpp-io-manip-boolalpha.html"><span class="kw1764">std::<span class="me2">boolalpha</span></span></a> <span class="sy1">&lt;&lt;</span> t.<span class="me1">joinable</span><span class="br0">(</span><span class="br0">)</span>
<span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span>
t <span class="sy1">=</span> <a href="cpp-thread-thread.html"><span class="kw2146">std::<span class="me2">thread</span></span></a><span class="br0">(</span>foo<span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;after starting, joinable: &quot;</span> <span class="sy1">&lt;&lt;</span> t.<span class="me1">joinable</span><span class="br0">(</span><span class="br0">)</span>
<span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span>
t.<span class="me1">join</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;after joining, joinable: &quot;</span> <span class="sy1">&lt;&lt;</span> t.<span class="me1">joinable</span><span class="br0">(</span><span class="br0">)</span>
<span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
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<p>&#36755;&#20986;&#65306;</p>
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<pre class="de1">before starting, joinable: false
after starting, joinable: true
after joining, joinable: false</pre></div>
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<h3><span class="mw-headline" id=".E5.BC.95.E7.94.A8">&#24341;&#29992;</span></h3>
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<li>C++20 &#26631;&#20934;&#65288;ISO/IEC 14882:2020&#65289;&#65306;</li>
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<li>32.4.3.2 Members [thread.jthread.mem]</li>
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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-thread-jthread-get_id.html"><span class="t-lines"><span>get_id</span></span></a></div>
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<td>&#36820;&#22238;&#32447;&#31243;&#30340; <i>id</i><br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div><a href="cpp-thread-jthread-join.html"><span class="t-lines"><span>join</span></span></a></div>
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<td>&#31561;&#24453;&#32447;&#31243;&#23436;&#25104;&#20854;&#25191;&#34892;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div><a href="cpp-thread-jthread-detach.html"><span class="t-lines"><span>detach</span></span></a></div>
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<td>&#23481;&#35768;&#32447;&#31243;&#20174;&#32447;&#31243;&#21477;&#26564;&#29420;&#31435;&#24320;&#26469;&#25191;&#34892;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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