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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>atomic_fetch_add, <span style="font-size:0.7em; line-height:130%">std::</span>atomic_fetch_add_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>
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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> T <span class="sy1">&gt;</span><br /></span>
<p>T atomic_fetch_add<span class="br0">(</span> <a href="cpp-atomic-atomic.html"><span class="kw2066">std::<span class="me2">atomic</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="sy2">*</span> obj,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw1">typename</span> <a href="cpp-atomic-atomic.html"><span class="kw2066">std::<span class="me2">atomic</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">difference_type</span> arg <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></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> T <span class="sy1">&gt;</span><br /></span>
<p>T atomic_fetch_add<span class="br0">(</span> <span class="kw4">volatile</span> <a href="cpp-atomic-atomic.html"><span class="kw2066">std::<span class="me2">atomic</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="sy2">*</span> obj,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw1">typename</span> <a href="cpp-atomic-atomic.html"><span class="kw2066">std::<span class="me2">atomic</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">difference_type</span> arg <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></div>
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<td rowspan="142">(2)</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> T <span class="sy1">&gt;</span><br /></span>
<p>T atomic_fetch_add_explicit<span class="br0">(</span> <a href="cpp-atomic-atomic.html"><span class="kw2066">std::<span class="me2">atomic</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="sy2">*</span> obj,<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span class="kw1">typename</span> <a href="cpp-atomic-atomic.html"><span class="kw2066">std::<span class="me2">atomic</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">difference_type</span> arg,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<a href="cpp-atomic-memory_order.html"><span class="kw2090">std::<span class="me2">memory_order</span></span></a> order <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></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> T <span class="sy1">&gt;</span><br /></span>
<p>T atomic_fetch_add_explicit<span class="br0">(</span> <span class="kw4">volatile</span> <a href="cpp-atomic-atomic.html"><span class="kw2066">std::<span class="me2">atomic</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="sy2">*</span> obj,<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span class="kw1">typename</span> <a href="cpp-atomic-atomic.html"><span class="kw2066">std::<span class="me2">atomic</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">difference_type</span> arg,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<a href="cpp-atomic-memory_order.html"><span class="kw2090">std::<span class="me2">memory_order</span></span></a> order <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></div>
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<p>&#36827;&#34892;&#21407;&#23376;&#21152;&#27861;&#12290;</p>
<p>&#21407;&#23376;&#22320;&#21152; <code>arg</code> &#21040; <code>obj</code> &#25152;&#25351;&#21521;&#30340;&#20540;&#65292;&#24182;&#36820;&#22238; <code>obj</code> &#20808;&#21069;&#20445;&#26377;&#30340;&#20540;&#12290;&#22914;&#21516;&#25191;&#34892;&#19979;&#21015;&#20869;&#23481;&#19968;&#33324;&#36827;&#34892;&#36816;&#31639;&#65306;</p>
<div class="t-li2"><span class="t-li">1)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp">obj<span class="sy2">-</span><span class="sy1">&gt;</span>fetch_add<span class="br0">(</span>arg<span class="br0">)</span></span></span></div>
<div class="t-li2"><span class="t-li">2)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp">obj<span class="sy2">-</span><span class="sy1">&gt;</span>fetch_add<span class="br0">(</span>arg, order<span class="br0">)</span></span></span></div>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
<table class="t-par-begin">
<tr class="t-par">
<td>obj</td>
<td>-</td>
<td>&#25351;&#21521;&#35201;&#20462;&#25913;&#30340;&#21407;&#23376;&#23545;&#35937;&#30340;&#25351;&#38024;</td>
</tr>
<tr class="t-par">
<td>arg</td>
<td>-</td>
<td>&#35201;&#21152;&#21040;&#23384;&#20648;&#20110;&#21407;&#23376;&#23545;&#35937;&#30340;&#20540;&#30340;&#20540;</td>
</tr>
<tr class="t-par">
<td>order</td>
<td>-</td>
<td>&#27492;&#25805;&#20316;&#25152;&#29992;&#30340;&#20869;&#23384;&#21516;&#27493;&#39034;&#24207;&#65306;&#23481;&#35768;&#25152;&#26377;&#20540;&#12290;</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><code>*obj</code> &#30340;<a href="cpp-atomic-memory_order.html#.E4.BF.AE.E6.94.B9.E9.A1.BA.E5.BA.8F">&#20462;&#25913;&#39034;&#24207;</a>&#20013;&#65292;&#31435;&#21363;&#21069;&#36235;&#27492;&#20989;&#25968;&#25928;&#24212;&#30340;&#20540;&#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.AF.E8.83.BD.E7.9A.84.E5.AE.9E.E7.8E.B0">&#21487;&#33021;&#30340;&#23454;&#29616;</span></h3>
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<div class="cpp source-cpp">
<pre class="de1"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> T <span class="sy1">&gt;</span>
T atomic_fetch_add<span class="br0">(</span> <a href="cpp-atomic-atomic.html"><span class="kw2066">std::<span class="me2">atomic</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="sy2">*</span> obj, <span class="kw1">typename</span> <a href="cpp-atomic-atomic.html"><span class="kw2066">std::<span class="me2">atomic</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">difference_type</span> arg <span class="br0">)</span>
<span class="br0">{</span>
<span class="kw1">return</span> obj<span class="sy2">-</span><span class="sy1">&gt;</span>fetch_add<span class="br0">(</span>arg<span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
<div class="t-example">
<p>&#21333;&#20889;&#32773;/&#22810;&#35835;&#32773;&#38145;&#33021;&#29992; fetch_add &#21046;&#20316;&#12290;&#27880;&#24847;&#27492;&#36807;&#20998;&#31616;&#21270;&#30340;&#23454;&#29616;&#19981;&#26159;&#20813;&#38145;&#30340;&#12290;</p>
<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;string&gt;</span>
<span class="co2">#include &lt;thread&gt;</span>
<span class="co2">#include &lt;vector&gt;</span>
<span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;atomic&gt;</span>
<span class="co2">#include &lt;chrono&gt;</span>
<span class="co1">// cnt &#30340;&#21547;&#20041;&#65306;</span>
<span class="co1">// 10 &#65306;&#26080;&#27963;&#36291;&#35835;&#32773;&#25110;&#20889;&#32773;</span>
<span class="co1">// 1...9 &#65306;&#26377; 9...1 &#20010;&#35835;&#32773;&#27963;&#36291;&#12290;&#20889;&#32773;&#34987;&#38459;&#22622;</span>
<span class="co1">// 0 &#65306; fetch_sub &#21644; fetch_add &#38388;&#30340;&#20020;&#26102;&#20540;&#22312;&#35835;&#32773;&#38145;&#20013;</span>
<span class="co1">// -1 &#65306;&#26377;&#27963;&#36291;&#20889;&#32773;&#12290;&#35835;&#32773;&#34987;&#38459;&#22622;&#12290;</span>
<span class="kw4">const</span> <span class="kw4">int</span> N <span class="sy1">=</span> <span class="nu0">10</span><span class="sy4">;</span> <span class="co1">// &#20801;&#35768;&#20061;&#20010;&#20849;&#26102;&#35835;&#32773;</span>
<a href="cpp-atomic-atomic.html"><span class="kw2066">std::<span class="me2">atomic</span></span></a><span class="sy1">&lt;</span><span class="kw4">int</span><span class="sy1">&gt;</span> cnt <span class="sy1">=</span> <a href="cpp-atomic-ATOMIC_VAR_INIT.html"><span class="kw2088">ATOMIC_VAR_INIT</span></a><span class="br0">(</span>N<span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-container-vector.html"><span class="kw1269">std::<span class="me2">vector</span></span></a><span class="sy1">&lt;</span><span class="kw4">int</span><span class="sy1">&gt;</span> data<span class="sy4">;</span>
<span class="kw4">void</span> reader<span class="br0">(</span><span class="kw4">int</span> id<span class="br0">)</span>
<span class="br0">{</span>
<span class="kw1">for</span><span class="br0">(</span><span class="sy4">;;</span><span class="br0">)</span>
<span class="br0">{</span>
<span class="co1">// &#38145;&#23450;</span>
<span class="kw1">while</span><span class="br0">(</span><a href="cpp-atomic-atomic_fetch_sub.html"><span class="kw2078">std::<span class="me2">atomic_fetch_sub</span></span></a><span class="br0">(</span><span class="sy3">&amp;</span>cnt, <span class="nu0">1</span><span class="br0">)</span> <span class="sy1">&lt;=</span> <span class="nu0">0</span><span class="br0">)</span>
std<span class="sy4">::</span><span class="me2">atomic_fetch_add</span><span class="br0">(</span><span class="sy3">&amp;</span>cnt, <span class="nu0">1</span><span class="br0">)</span><span class="sy4">;</span>
<span class="co1">// &#35835;&#21462;</span>
<span class="kw1">if</span><span class="br0">(</span><span class="sy3">!</span>data.<span class="me1">empty</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</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="br0">(</span> <span class="st0">&quot;reader &quot;</span> <span class="sy2">+</span> <a href="cpp-string-basic_string-to_string.html"><span class="kw1265">std::<span class="me2">to_string</span></span></a><span class="br0">(</span>id<span class="br0">)</span>
<span class="sy2">+</span> <span class="st0">&quot; sees &quot;</span> <span class="sy2">+</span> <a href="cpp-string-basic_string-to_string.html"><span class="kw1265">std::<span class="me2">to_string</span></span></a><span class="br0">(</span><span class="sy2">*</span>data.<span class="me1">rbegin</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span> <span class="sy2">+</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">if</span><span class="br0">(</span>data.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> <span class="nu0">100</span><span class="br0">)</span>
<span class="kw1">break</span><span class="sy4">;</span>
<span class="co1">// &#35299;&#38145;</span>
std<span class="sy4">::</span><span class="me2">atomic_fetch_add</span><span class="br0">(</span><span class="sy3">&amp;</span>cnt, <span class="nu0">1</span><span class="br0">)</span><span class="sy4">;</span>
<span class="co1">// &#26242;&#20572;</span>
<a href="cpp-thread-sleep_for.html"><span class="kw2147">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="kw996">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">milliseconds</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="br0">}</span>
<span class="kw4">void</span> writer<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<span class="kw1">for</span><span class="br0">(</span><span class="kw4">int</span> n <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span> n <span class="sy1">&lt;</span> <span class="nu0">100</span><span class="sy4">;</span> <span class="sy2">++</span>n<span class="br0">)</span>
<span class="br0">{</span>
<span class="co1">// &#38145;&#23450;</span>
<span class="kw1">while</span><span class="br0">(</span><a href="cpp-atomic-atomic_fetch_sub.html"><span class="kw2078">std::<span class="me2">atomic_fetch_sub</span></span></a><span class="br0">(</span><span class="sy3">&amp;</span>cnt, N<span class="sy2">+</span><span class="nu0">1</span><span class="br0">)</span> <span class="sy3">!</span><span class="sy1">=</span> N<span class="br0">)</span>
std<span class="sy4">::</span><span class="me2">atomic_fetch_add</span><span class="br0">(</span><span class="sy3">&amp;</span>cnt, N<span class="sy2">+</span><span class="nu0">1</span><span class="br0">)</span><span class="sy4">;</span>
<span class="co1">// &#20889;&#20837;</span>
data.<span class="me1">push_back</span><span class="br0">(</span>n<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;writer pushed back &quot;</span> <span class="sy1">&lt;&lt;</span> n <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span>
<span class="co1">// &#35299;&#38145;</span>
std<span class="sy4">::</span><span class="me2">atomic_fetch_add</span><span class="br0">(</span><span class="sy3">&amp;</span>cnt, N<span class="sy2">+</span><span class="nu0">1</span><span class="br0">)</span><span class="sy4">;</span>
<span class="co1">// &#26242;&#20572;</span>
<a href="cpp-thread-sleep_for.html"><span class="kw2147">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="kw996">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">milliseconds</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="br0">}</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<a href="cpp-container-vector.html"><span class="kw1269">std::<span class="me2">vector</span></span></a><span class="sy1">&lt;</span><a href="cpp-thread-thread.html"><span class="kw2144">std::<span class="me2">thread</span></span></a><span class="sy1">&gt;</span> v<span class="sy4">;</span>
<span class="kw1">for</span> <span class="br0">(</span><span class="kw4">int</span> n <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span> n <span class="sy1">&lt;</span> N<span class="sy4">;</span> <span class="sy2">++</span>n<span class="br0">)</span> <span class="br0">{</span>
v.<span class="me1">emplace_back</span><span class="br0">(</span>reader, n<span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span>
v.<span class="me1">emplace_back</span><span class="br0">(</span>writer<span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">for</span> <span class="br0">(</span><span class="kw4">auto</span><span class="sy3">&amp;</span> t <span class="sy4">:</span> v<span class="br0">)</span> <span class="br0">{</span>
t.<span class="me1">join</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</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">writer pushed back 0
reader 8 sees 0
reader 3 sees 0
reader 1 sees 0
&lt;...&gt;
reader 2 sees 99
reader 6 sees 99
reader 1 sees 99</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://wg21.link/P0558R1">P0558R1</a></td>
<td>C++11</td>
<td>&#26366;&#35201;&#27714;&#20934;&#30830;&#31867;&#22411;&#21305;&#37197;&#65292;&#22240;&#20026;&#20174;&#22810;&#20010;&#21442;&#25968;&#25512;&#23548; <code>T</code></td>
<td>&#20165;&#20174; <code>atomic</code> &#21442;&#25968;&#25512;&#23548; <code>T</code></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-fetch_add.html"><span class="t-lines"><span>fetch_add</span></span></a></div>
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<td>&#21407;&#23376;&#22320;&#23558;&#21442;&#25968;&#21152;&#21040;&#23384;&#20648;&#20110;&#21407;&#23376;&#23545;&#35937;&#30340;&#20540;&#65292;&#24182;&#36820;&#22238;&#20808;&#21069;&#20445;&#26377;&#30340;&#20540;<br />
<span class="t-mark">(<code>std::atomic&lt;T&gt;</code> &#30340;&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div><a href="cpp-atomic-atomic_fetch_sub.html"><span class="t-lines"><span>atomic_fetch_sub</span><span>atomic_fetch_sub_explicit</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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<td>&#20174;&#21407;&#23376;&#23545;&#35937;&#20943;&#21435;&#38750;&#21407;&#23376;&#20540;&#65292;&#24182;&#33719;&#24471;&#21407;&#23376;&#23545;&#35937;&#30340;&#20808;&#21069;&#20540;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
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