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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>packaged_task</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></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code><a href="cpp-header-future.html">&lt;future&gt;</a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> <span class="sy1">&gt;</span> <span class="kw1">class</span> packaged_task<span class="sy4">;</span> <span class="co1">// &#19981;&#23450;&#20041;</span></span></div>
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<td>(1)</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> R, <span class="kw1">class</span> ...<span class="me1">Args</span> <span class="sy1">&gt;</span><br />
<span class="kw1">class</span> packaged_task<span class="sy1">&lt;</span>R<span class="br0">(</span>Args...<span class="br0">)</span><span class="sy1">&gt;</span><span class="sy4">;</span></span></div>
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<td>(2)</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
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<p>&#31867;&#27169;&#26495; <code>std::packaged_task</code> &#21253;&#35013;&#20219;&#20309;<a href="cpp-named_req-Callable.html"><span style="font-style:italic">&#21487;&#35843;&#29992;</span> <span style="font-family: Georgia, &#39;DejaVu Serif&#39;, serif; font-style:italic">(Callable)</span></a> &#30446;&#26631;&#65288;&#20989;&#25968;&#12289; lambda &#34920;&#36798;&#24335;&#12289; bind &#34920;&#36798;&#24335;&#25110;&#20854;&#20182;&#20989;&#25968;&#23545;&#35937;&#65289;&#65292;&#20351;&#24471;&#33021;&#24322;&#27493;&#35843;&#29992;&#23427;&#12290;&#20854;&#36820;&#22238;&#20540;&#25110;&#25152;&#25243;&#24322;&#24120;&#34987;&#23384;&#20648;&#20110;&#33021;&#36890;&#36807; <span class="t-lc"><a href="cpp-thread-future.html">std::future</a></span> &#23545;&#35937;&#35775;&#38382;&#30340;&#20849;&#20139;&#29366;&#24577;&#20013;&#12290;</p>
<p>&#27491;&#22914; <span class="t-lc"><a href="cpp-utility-functional-function.html">std::function</a></span> &#65292; <code>std::packaged_task</code> &#26159;&#22810;&#24577;&#12289;&#20855;&#20998;&#37197;&#22120;&#30340;&#23481;&#22120;&#65306;&#21487;&#22312;&#22534;&#19978;&#25110;&#20197;&#25552;&#20379;&#30340;&#20998;&#37197;&#22120;&#20998;&#37197;&#23384;&#20648;&#30340;&#21487;&#35843;&#29992;&#23545;&#35937;&#12290;</p>
<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">&#25104;&#21592;&#20989;&#25968;</span></h3>
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<div class="t-dsc-member-div t-dsc-member-nobold-div">
<div><a href="cpp-thread-packaged_task-packaged_task.html"><span class="t-lines"><span>(&#26500;&#36896;&#20989;&#25968;)</span></span></a></div>
</div>
</td>
<td>&#26500;&#36896;&#20219;&#21153;&#23545;&#35937;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div class="t-dsc-member-div t-dsc-member-nobold-div">
<div><a href="cpp-thread-packaged_task-~packaged_task.html"><span class="t-lines"><span>(&#26512;&#26500;&#20989;&#25968;)</span></span></a></div>
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<td>&#26512;&#26500;&#20219;&#21153;&#23545;&#35937;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-thread-packaged_task-operator=.html"><span class="t-lines"><span>operator=</span></span></a></div>
</div>
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<td>&#31227;&#21160;&#20219;&#21153;&#23545;&#35937;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-thread-packaged_task-valid.html"><span class="t-lines"><span>valid</span></span></a></div>
</div>
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<td>&#26816;&#26597;&#20219;&#21153;&#23545;&#35937;&#26159;&#21542;&#25317;&#26377;&#21512;&#27861;&#20989;&#25968;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-thread-packaged_task-swap.html"><span class="t-lines"><span>swap</span></span></a></div>
</div>
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<td>&#20132;&#25442;&#20108;&#20010;&#20219;&#21153;&#23545;&#35937;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<h5><span class="mw-headline" id=".E8.8E.B7.E5.8F.96.E7.BB.93.E6.9E.9C">&#33719;&#21462;&#32467;&#26524;</span></h5>
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<div class="t-dsc-member-div">
<div><a href="cpp-thread-packaged_task-get_future.html"><span class="t-lines"><span>get_future</span></span></a></div>
</div>
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<td>&#36820;&#22238;&#19982;&#25215;&#35834;&#30340;&#32467;&#26524;&#20851;&#32852;&#30340; <span class="t-lc"><a href="cpp-thread-future.html">std::future</a></span><br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<h5><span class="mw-headline" id=".E6.89.A7.E8.A1.8C">&#25191;&#34892;</span></h5>
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<div class="t-dsc-member-div">
<div><a href="cpp-thread-packaged_task-operator().html"><span class="t-lines"><span>operator()</span></span></a></div>
</div>
</td>
<td>&#25191;&#34892;&#20989;&#25968;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-thread-packaged_task-make_ready_at_thread_exit.html"><span class="t-lines"><span>make_ready_at_thread_exit</span></span></a></div>
</div>
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<td>&#25191;&#34892;&#20989;&#25968;&#65292;&#24182;&#30830;&#20445;&#32467;&#26524;&#20165;&#22312;&#19968;&#26086;&#24403;&#21069;&#32447;&#31243;&#36864;&#20986;&#26102;&#23601;&#32490;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-thread-packaged_task-reset.html"><span class="t-lines"><span>reset</span></span></a></div>
</div>
</td>
<td>&#37325;&#32622;&#29366;&#24577;&#65292;&#25243;&#24323;&#20219;&#20309;&#20808;&#21069;&#25191;&#34892;&#30340;&#23384;&#20648;&#32467;&#26524;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
</tr>
</table>
<h3><span class="mw-headline" id=".E9.9D.9E.E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">&#38750;&#25104;&#21592;&#20989;&#25968;</span></h3>
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<div><a href="cpp-thread-packaged_task-swap2.html"><span class="t-lines"><span>std::swap<span class="t-dsc-small">(std::packaged_task)</span></span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
</div>
</td>
<td>&#29305;&#21270; <span class="t-lc"><a href="cpp-algorithm-swap.html">std::swap</a></span> &#31639;&#27861;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
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<h3><span class="mw-headline" id=".E8.BE.85.E5.8A.A9.E7.B1.BB">&#36741;&#21161;&#31867;</span></h3>
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<div><a href="cpp-thread-packaged_task-uses_allocator.html"><span class="t-lines"><span>std::uses_allocator<span class="t-dsc-small">&lt;std::packaged_task&gt;</span></span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span><span class="t-mark-rev t-until-cxx17">(C++17 &#21069;)</span></span></span></div>
</div>
</td>
<td>&#29305;&#21270; <span class="t-lc"><a href="cpp-memory-uses_allocator.html">std::uses_allocator</a></span> &#31867;&#22411;&#29305;&#24449;<br />
<span class="t-mark">(&#31867;&#27169;&#26495;&#29305;&#21270;)</span></td>
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</table>
<h3><span class="mw-headline" id=".E6.8E.A8.E5.AF.BC.E6.8C.87.E5.BC.95.28C.2B.2B17_.E8.B5.B7.29"><a href="cpp-thread-packaged_task-deduction_guides.html">&#25512;&#23548;&#25351;&#24341;</a><span class="t-mark-rev t-since-cxx17">(C++17 &#36215;)</span></span></h3>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
<div class="t-example">
<div class="t-example-live-link"></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="cpp source-cpp">
<pre class="de1"><span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;cmath&gt;</span>
<span class="co2">#include &lt;thread&gt;</span>
<span class="co2">#include &lt;future&gt;</span>
<span class="co2">#include &lt;functional&gt;</span>
<span class="co1">// &#36991;&#20813;&#23545; std::pow &#37325;&#36733;&#38598;&#28040;&#27495;&#20041;&#30340;&#29420;&#26377;&#20989;&#25968;</span>
<span class="kw4">int</span> f<span class="br0">(</span><span class="kw4">int</span> x, <span class="kw4">int</span> y<span class="br0">)</span> <span class="br0">{</span> <span class="kw1">return</span> <a href="cpp-numeric-math-pow.html"><span class="kw1332">std::<span class="me2">pow</span></span></a><span class="br0">(</span>x,y<span class="br0">)</span><span class="sy4">;</span> <span class="br0">}</span>
<span class="kw4">void</span> task_lambda<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
std<span class="sy4">::</span><span class="me2">packaged_task</span><span class="sy1">&lt;</span><span class="kw4">int</span><span class="br0">(</span><span class="kw4">int</span>,<span class="kw4">int</span><span class="br0">)</span><span class="sy1">&gt;</span> task<span class="br0">(</span><span class="br0">[</span><span class="br0">]</span><span class="br0">(</span><span class="kw4">int</span> a, <span class="kw4">int</span> b<span class="br0">)</span> <span class="br0">{</span>
<span class="kw1">return</span> <a href="cpp-numeric-math-pow.html"><span class="kw1332">std::<span class="me2">pow</span></span></a><span class="br0">(</span>a, b<span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-thread-future.html"><span class="kw2180">std::<span class="me2">future</span></span></a><span class="sy1">&lt;</span><span class="kw4">int</span><span class="sy1">&gt;</span> result <span class="sy1">=</span> task.<span class="me1">get_future</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
task<span class="br0">(</span><span class="nu0">2</span>, <span class="nu0">9</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;task_lambda:<span class="es1">\t</span>&quot;</span> <span class="sy1">&lt;&lt;</span> result.<span class="me1">get</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>
<span class="kw4">void</span> task_bind<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
std<span class="sy4">::</span><span class="me2">packaged_task</span><span class="sy1">&lt;</span><span class="kw4">int</span><span class="br0">(</span><span class="br0">)</span><span class="sy1">&gt;</span> task<span class="br0">(</span><a href="cpp-utility-functional-bind.html"><span class="kw1052">std::<span class="me2">bind</span></span></a><span class="br0">(</span>f, <span class="nu0">2</span>, <span class="nu0">11</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-thread-future.html"><span class="kw2180">std::<span class="me2">future</span></span></a><span class="sy1">&lt;</span><span class="kw4">int</span><span class="sy1">&gt;</span> result <span class="sy1">=</span> task.<span class="me1">get_future</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
task<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;task_bind:<span class="es1">\t</span>&quot;</span> <span class="sy1">&lt;&lt;</span> result.<span class="me1">get</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>
<span class="kw4">void</span> task_thread<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
std<span class="sy4">::</span><span class="me2">packaged_task</span><span class="sy1">&lt;</span><span class="kw4">int</span><span class="br0">(</span><span class="kw4">int</span>,<span class="kw4">int</span><span class="br0">)</span><span class="sy1">&gt;</span> task<span class="br0">(</span>f<span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-thread-future.html"><span class="kw2180">std::<span class="me2">future</span></span></a><span class="sy1">&lt;</span><span class="kw4">int</span><span class="sy1">&gt;</span> result <span class="sy1">=</span> task.<span class="me1">get_future</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-thread-thread.html"><span class="kw2146">std::<span class="me2">thread</span></span></a> task_td<span class="br0">(</span>std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>task<span class="br0">)</span>, <span class="nu0">2</span>, <span class="nu0">10</span><span class="br0">)</span><span class="sy4">;</span>
task_td.<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;task_thread:<span class="es1">\t</span>&quot;</span> <span class="sy1">&lt;&lt;</span> result.<span class="me1">get</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>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
task_lambda<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
task_bind<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
task_thread<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
</div>
<p>&#36755;&#20986;&#65306;</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="text source-text">
<pre class="de1">task_lambda: 512
task_bind: 2048
task_thread: 1024</pre></div>
</div>
</div>
<h3><span class="mw-headline" id=".E7.BC.BA.E9.99.B7.E6.8A.A5.E5.91.8A">&#32570;&#38519;&#25253;&#21578;</span></h3>
<p>&#19979;&#21015;&#26356;&#25913;&#34892;&#20026;&#30340;&#32570;&#38519;&#25253;&#21578;&#36861;&#28335;&#22320;&#24212;&#29992;&#20110;&#20197;&#21069;&#20986;&#29256;&#30340; C++ &#26631;&#20934;&#12290;</p>
<table class="dsctable" style="font-size:0.8em">
<tr>
<th>DR</th>
<th>&#24212;&#29992;&#20110;</th>
<th>&#20986;&#29256;&#26102;&#30340;&#34892;&#20026;</th>
<th>&#27491;&#30830;&#34892;&#20026;</th>
</tr>
<tr>
<td><a rel="nofollow" class="external text" href="https://cplusplus.github.io/LWG/issue3117">LWG 3117</a></td>
<td>C++17</td>
<td><code>packaged_task</code> &#30340;&#25512;&#23548;&#25351;&#24341;&#32570;&#22833;</td>
<td>&#24050;&#28155;&#21152;</td>
</tr>
</table>
<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">&#21442;&#38405;</span></h3>
<table class="t-dsc-begin">
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-thread-future.html"><span class="t-lines"><span>future</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
</div>
</td>
<td>&#31561;&#24453;&#34987;&#24322;&#27493;&#35774;&#32622;&#30340;&#20540;<br />
<span class="t-mark">(&#31867;&#27169;&#26495;)</span></td>
</tr>
</table>
</div>
<div class="visualClear"></div>
</div>
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