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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::valarray&lt;T&gt;::</span>operator+=,-=,*=,/=,%=,&amp;=,|=,&lt;&lt;=,&gt;&gt;=</h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-numeric.html">numeric</a>&lrm; | <a href="cpp-numeric-valarray.html">valarray</a></span></div>
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<div><span class="mw-geshi cpp source-cpp">valarray<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> operator<span class="sy2">+</span><span class="sy1">=</span><span class="br0">(</span> <span class="kw4">const</span> valarray<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="sy3">&amp;</span> v <span class="br0">)</span><span class="sy4">;</span><br /></span>
<p>valarray<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> operator<span class="sy2">-</span><span class="sy1">=</span><span class="br0">(</span> <span class="kw4">const</span> valarray<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="sy3">&amp;</span> v <span class="br0">)</span><span class="sy4">;</span><br />
valarray<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> operator<span class="sy2">*</span><span class="sy1">=</span><span class="br0">(</span> <span class="kw4">const</span> valarray<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="sy3">&amp;</span> v <span class="br0">)</span><span class="sy4">;</span><br />
valarray<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> operator<span class="sy2">/</span><span class="sy1">=</span><span class="br0">(</span> <span class="kw4">const</span> valarray<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="sy3">&amp;</span> v <span class="br0">)</span><span class="sy4">;</span><br />
valarray<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> operator<span class="sy2">%</span><span class="sy1">=</span><span class="br0">(</span> <span class="kw4">const</span> valarray<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="sy3">&amp;</span> v <span class="br0">)</span><span class="sy4">;</span><br />
valarray<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> operator<span class="sy3">&amp;</span><span class="sy1">=</span><span class="br0">(</span> <span class="kw4">const</span> valarray<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="sy3">&amp;</span> v <span class="br0">)</span><span class="sy4">;</span><br />
valarray<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> operator<span class="sy3">|</span><span class="sy1">=</span><span class="br0">(</span> <span class="kw4">const</span> valarray<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="sy3">&amp;</span> v <span class="br0">)</span><span class="sy4">;</span><br />
valarray<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> operator<span class="sy3">^</span><span class="sy1">=</span><span class="br0">(</span> <span class="kw4">const</span> valarray<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="sy3">&amp;</span> v <span class="br0">)</span><span class="sy4">;</span><br />
valarray<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> operator<span class="sy1">&lt;&lt;=</span><span class="br0">(</span> <span class="kw4">const</span> valarray<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="sy3">&amp;</span> v <span class="br0">)</span><span class="sy4">;</span><br /></p>
valarray<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> operator<span class="sy1">&gt;&gt;=</span><span class="br0">(</span> <span class="kw4">const</span> valarray<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="sy3">&amp;</span> v <span class="br0">)</span><span class="sy4">;</span></div>
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<div><span class="mw-geshi cpp source-cpp">valarray<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> operator<span class="sy2">+</span><span class="sy1">=</span><span class="br0">(</span> <span class="kw4">const</span> T<span class="sy3">&amp;</span> val <span class="br0">)</span><span class="sy4">;</span><br /></span>
<p>valarray<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> operator<span class="sy2">-</span><span class="sy1">=</span><span class="br0">(</span> <span class="kw4">const</span> T<span class="sy3">&amp;</span> val <span class="br0">)</span><span class="sy4">;</span><br />
valarray<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> operator<span class="sy2">*</span><span class="sy1">=</span><span class="br0">(</span> <span class="kw4">const</span> T<span class="sy3">&amp;</span> val <span class="br0">)</span><span class="sy4">;</span><br />
valarray<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> operator<span class="sy2">/</span><span class="sy1">=</span><span class="br0">(</span> <span class="kw4">const</span> T<span class="sy3">&amp;</span> val <span class="br0">)</span><span class="sy4">;</span><br />
valarray<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> operator<span class="sy2">%</span><span class="sy1">=</span><span class="br0">(</span> <span class="kw4">const</span> T<span class="sy3">&amp;</span> val <span class="br0">)</span><span class="sy4">;</span><br />
valarray<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> operator<span class="sy3">&amp;</span><span class="sy1">=</span><span class="br0">(</span> <span class="kw4">const</span> T<span class="sy3">&amp;</span> val <span class="br0">)</span><span class="sy4">;</span><br />
valarray<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> operator<span class="sy3">|</span><span class="sy1">=</span><span class="br0">(</span> <span class="kw4">const</span> T<span class="sy3">&amp;</span> val <span class="br0">)</span><span class="sy4">;</span><br />
valarray<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> operator<span class="sy3">^</span><span class="sy1">=</span><span class="br0">(</span> <span class="kw4">const</span> T<span class="sy3">&amp;</span> val <span class="br0">)</span><span class="sy4">;</span><br />
valarray<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> operator<span class="sy1">&lt;&lt;=</span><span class="br0">(</span> <span class="kw4">const</span> T<span class="sy3">&amp;</span> val <span class="br0">)</span><span class="sy4">;</span><br /></p>
valarray<span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> operator<span class="sy1">&gt;&gt;=</span><span class="br0">(</span> <span class="kw4">const</span> T<span class="sy3">&amp;</span> val <span class="br0">)</span><span class="sy4">;</span></div>
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<td>(2)</td>
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<p>&#24212;&#29992;&#22797;&#21512;&#36171;&#20540;&#36816;&#31639;&#31526;&#21040;&#25968;&#20540;&#25968;&#32452;&#20013;&#30340;&#27599;&#20010;&#20803;&#32032;&#12290;</p>
<div class="t-li1"><span class="t-li">1)</span> &#23558;&#20197;&#24212;&#29992;&#23545;&#24212;&#36816;&#31639;&#31526;&#21040;&#27599;&#20010;&#20803;&#32032;&#20808;&#21069;&#20540;&#21644;&#26469;&#33258; <code>v</code> &#30340;&#23545;&#24212;&#20803;&#32032;&#25152;&#33719;&#24471;&#30340;&#20540;&#65292;&#36171;&#20540;&#32473;&#27599;&#20010;&#20803;&#32032;&#12290;</div>
<div class="t-li1"><span class="t-li"></span> &#33509; <span class="t-c"><span class="mw-geshi cpp source-cpp">size<span class="br0">(</span><span class="br0">)</span> <span class="sy3">!</span><span class="sy1">=</span> v.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span></span></span> &#21017;&#34892;&#20026;&#26410;&#23450;&#20041;&#12290;</div>
<div class="t-li1"><span class="t-li"></span> &#33509;&#20219;&#20309; <code>v</code> &#20013;&#30340;&#20540;&#22312;&#36171;&#20540;&#36807;&#31243;&#20013;&#35745;&#31639;&#24182;&#20381;&#36182;&#20219;&#20309; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span> &#20013;&#30340;&#20540;&#65292;&#21363;&#36171;&#20540;&#21491;&#20391;&#30340;&#34920;&#36798;&#24335;&#24341;&#29992;&#21040;&#36171;&#20540;&#24038;&#20391;&#30340;&#21464;&#37327;&#65292;&#21017;&#34892;&#20026;&#26410;&#23450;&#20041;&#12290;</div>
<div class="t-li1"><span class="t-li">2)</span> &#23558;&#20197;&#24212;&#29992;&#23545;&#24212;&#36816;&#31639;&#31526;&#21040;&#27599;&#20010;&#20803;&#32032;&#20808;&#21069;&#20540;&#21644; <code>val</code> &#30340;&#20540;&#25152;&#33719;&#24471;&#30340;&#20540;&#65292;&#36171;&#20540;&#32473;&#27599;&#20010;&#20803;&#32032;&#12290;</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>v</td>
<td>-</td>
<td>&#21478;&#19968;&#20010;&#25968;&#20540;&#25968;&#32452;</td>
</tr>
<tr class="t-par">
<td>val</td>
<td>-</td>
<td>&#19968;&#20010;&#20540;</td>
</tr>
</table>
<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<p><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span></p>
<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">&#24322;&#24120;</span></h3>
<p>&#21487;&#33021;&#25243;&#20986;&#23454;&#29616;&#23450;&#20041;&#30340;&#24322;&#24120;&#12290;</p>
<h3><span class="mw-headline" id=".E6.B3.A8.E8.A7.A3">&#27880;&#35299;</span></h3>
<p>&#20165;&#33509;&#28385;&#36275;&#19979;&#21015;&#26465;&#20214;&#65292;&#25165;&#33021;&#23454;&#20363;&#21270;&#21508;&#20010;&#36816;&#31639;&#31526;&#65306;</p>
<ul>
<li>&#25152;&#25351;&#31034;&#30340;&#36816;&#31639;&#31526;&#21487;&#24212;&#29992;&#20110;&#31867;&#22411; <code>T</code></li>
<li>&#36820;&#22238;&#20540;&#21487;&#20197;&#26080;&#27495;&#20041;&#22320;&#36716;&#25442;&#20026; <code>T</code> &#12290;</li>
</ul>
<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;string_view&gt;</span>
<span class="co2">#include &lt;type_traits&gt;</span>
<span class="co2">#include &lt;valarray&gt;</span>
<span class="kw4">void</span> o<span class="br0">(</span><a href="cpp-string-basic_string_view.html"><span class="kw1248">std::<span class="me2">string_view</span></span></a> rem, <span class="kw4">auto</span> <span class="kw4">const</span><span class="sy3">&amp;</span> v, <span class="kw4">bool</span> nl <span class="sy1">=</span> <span class="kw2">false</span><span class="br0">)</span> <span class="br0">{</span>
<span class="kw1">if</span> <span class="kw4">constexpr</span> <span class="br0">(</span><a href="cpp-types-is_scalar.html"><span class="kw489">std::<span class="me2">is_scalar_v</span></span></a><span class="sy1">&lt;</span><a href="cpp-types-decay.html"><span class="kw629">std::<span class="me2">decay_t</span></span></a><span class="sy1">&lt;</span>decltype<span class="br0">(</span>v<span class="br0">)</span><span class="sy1">&gt;&gt;</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> rem <span class="sy1">&lt;&lt;</span> <span class="st0">&quot; : &quot;</span> <span class="sy1">&lt;&lt;</span> v<span class="sy4">;</span>
<span class="br0">}</span> <span class="kw1">else</span> <span class="br0">{</span>
<span class="kw1">for</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> rem <span class="sy1">&lt;&lt;</span> <span class="st0">&quot; : { &quot;</span><span class="sy4">;</span> <span class="kw4">auto</span> <span class="kw4">const</span> e <span class="sy4">:</span> v<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> e <span class="sy1">&lt;&lt;</span> <span class="st0">&#39; &#39;</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;}&quot;</span><span class="sy4">;</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>nl <span class="sy4">?</span> <span class="st0">&quot;<span class="es1">\n</span>&quot;</span> <span class="sy4">:</span> <span class="st0">&quot;; &quot;</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>
<a href="cpp-numeric-valarray.html"><span class="kw1473">std::<span class="me2">valarray</span></span></a><span class="sy1">&lt;</span><span class="kw4">int</span><span class="sy1">&gt;</span> x, y<span class="sy4">;</span>
o<span class="br0">(</span><span class="st0">&quot;x&quot;</span>, x <span class="sy1">=</span> <span class="br0">{</span><span class="nu0">1</span>, <span class="nu0">2</span>, <span class="nu0">3</span>, <span class="nu0">4</span><span class="br0">}</span><span class="br0">)</span>, o<span class="br0">(</span><span class="st0">&quot;y&quot;</span>, y <span class="sy1">=</span> <span class="br0">{</span><span class="nu0">4</span>, <span class="nu0">3</span>, <span class="nu0">2</span>, <span class="nu0">1</span><span class="br0">}</span><span class="br0">)</span>, o<span class="br0">(</span><span class="st0">&quot;x += y&quot;</span>, x <span class="sy2">+</span><span class="sy1">=</span> y, <span class="nu0">1</span><span class="br0">)</span><span class="sy4">;</span>
o<span class="br0">(</span><span class="st0">&quot;x&quot;</span>, x <span class="sy1">=</span> <span class="br0">{</span><span class="nu0">4</span>, <span class="nu0">3</span>, <span class="nu0">2</span>, <span class="nu0">1</span><span class="br0">}</span><span class="br0">)</span>, o<span class="br0">(</span><span class="st0">&quot;y&quot;</span>, y <span class="sy1">=</span> <span class="br0">{</span><span class="nu0">3</span>, <span class="nu0">2</span>, <span class="nu0">1</span>, <span class="nu0">0</span><span class="br0">}</span><span class="br0">)</span>, o<span class="br0">(</span><span class="st0">&quot;x -= y&quot;</span>, x <span class="sy2">-</span><span class="sy1">=</span> y, <span class="nu0">1</span><span class="br0">)</span><span class="sy4">;</span>
o<span class="br0">(</span><span class="st0">&quot;x&quot;</span>, x <span class="sy1">=</span> <span class="br0">{</span><span class="nu0">1</span>, <span class="nu0">2</span>, <span class="nu0">3</span>, <span class="nu0">4</span><span class="br0">}</span><span class="br0">)</span>, o<span class="br0">(</span><span class="st0">&quot;y&quot;</span>, y <span class="sy1">=</span> <span class="br0">{</span><span class="nu0">5</span>, <span class="nu0">4</span>, <span class="nu0">3</span>, <span class="nu0">2</span><span class="br0">}</span><span class="br0">)</span>, o<span class="br0">(</span><span class="st0">&quot;x *= y&quot;</span>, x <span class="sy2">*</span><span class="sy1">=</span> y, <span class="nu0">1</span><span class="br0">)</span><span class="sy4">;</span>
o<span class="br0">(</span><span class="st0">&quot;x&quot;</span>, x <span class="sy1">=</span> <span class="br0">{</span><span class="nu0">1</span>, <span class="nu0">3</span>, <span class="nu0">4</span>, <span class="nu0">7</span><span class="br0">}</span><span class="br0">)</span>, o<span class="br0">(</span><span class="st0">&quot;y&quot;</span>, y <span class="sy1">=</span> <span class="br0">{</span><span class="nu0">1</span>, <span class="nu0">1</span>, <span class="nu0">3</span>, <span class="nu0">5</span><span class="br0">}</span><span class="br0">)</span>, o<span class="br0">(</span><span class="st0">&quot;x &amp;= y&quot;</span>, x <span class="sy3">&amp;</span><span class="sy1">=</span> y, <span class="nu0">1</span><span class="br0">)</span><span class="sy4">;</span>
o<span class="br0">(</span><span class="st0">&quot;x&quot;</span>, x <span class="sy1">=</span> <span class="br0">{</span><span class="nu0">0</span>, <span class="nu0">1</span>, <span class="nu0">2</span>, <span class="nu0">4</span><span class="br0">}</span><span class="br0">)</span>, o<span class="br0">(</span><span class="st0">&quot;y&quot;</span>, y <span class="sy1">=</span> <span class="br0">{</span><span class="nu0">4</span>, <span class="nu0">3</span>, <span class="nu0">2</span>, <span class="nu0">1</span><span class="br0">}</span><span class="br0">)</span>, o<span class="br0">(</span><span class="st0">&quot;x &lt;&lt;=y&quot;</span>, x <span class="sy1">&lt;&lt;=</span>y, <span class="nu0">1</span><span class="br0">)</span><span class="sy4">;</span>
o<span class="br0">(</span><span class="st0">&quot;x&quot;</span>, x <span class="sy1">=</span> <span class="br0">{</span><span class="nu0">1</span>, <span class="nu0">2</span>, <span class="nu0">3</span>, <span class="nu0">4</span><span class="br0">}</span><span class="br0">)</span>, o<span class="br0">(</span><span class="st0">&quot;x += 5&quot;</span>, x <span class="sy2">+</span><span class="sy1">=</span> <span class="nu0">5</span>, <span class="nu0">1</span><span class="br0">)</span><span class="sy4">;</span>
o<span class="br0">(</span><span class="st0">&quot;x&quot;</span>, x <span class="sy1">=</span> <span class="br0">{</span><span class="nu0">1</span>, <span class="nu0">2</span>, <span class="nu0">3</span>, <span class="nu0">4</span><span class="br0">}</span><span class="br0">)</span>, o<span class="br0">(</span><span class="st0">&quot;x *= 2&quot;</span>, x <span class="sy2">*</span><span class="sy1">=</span> <span class="nu0">2</span>, <span class="nu0">1</span><span class="br0">)</span><span class="sy4">;</span>
o<span class="br0">(</span><span class="st0">&quot;x&quot;</span>, x <span class="sy1">=</span> <span class="br0">{</span><span class="nu0">8</span>, <span class="nu0">6</span>, <span class="nu0">4</span>, <span class="nu0">2</span><span class="br0">}</span><span class="br0">)</span>, o<span class="br0">(</span><span class="st0">&quot;x /= 2&quot;</span>, x <span class="sy2">/</span><span class="sy1">=</span> <span class="nu0">2</span>, <span class="nu0">1</span><span class="br0">)</span><span class="sy4">;</span>
o<span class="br0">(</span><span class="st0">&quot;x&quot;</span>, x <span class="sy1">=</span> <span class="br0">{</span><span class="nu0">8</span>, <span class="nu0">4</span>, <span class="nu0">2</span>, <span class="nu0">1</span><span class="br0">}</span><span class="br0">)</span>, o<span class="br0">(</span><span class="st0">&quot;x &gt;&gt;=1&quot;</span>, x <span class="sy1">&gt;&gt;=</span><span class="nu0">1</span>, <span class="nu0">1</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;">
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<pre class="de1">x : { 1 2 3 4 }; y : { 4 3 2 1 }; x += y : { 5 5 5 5 }
x : { 4 3 2 1 }; y : { 3 2 1 0 }; x -= y : { 1 1 1 1 }
x : { 1 2 3 4 }; y : { 5 4 3 2 }; x *= y : { 5 8 9 8 }
x : { 1 3 4 7 }; y : { 1 1 3 5 }; x &amp;= y : { 1 1 0 5 }
x : { 0 1 2 4 }; y : { 4 3 2 1 }; x &lt;&lt;=y : { 0 8 8 8 }
x : { 1 2 3 4 }; x += 5 : { 6 7 8 9 }
x : { 1 2 3 4 }; x *= 2 : { 2 4 6 8 }
x : { 8 6 4 2 }; x /= 2 : { 4 3 2 1 }
x : { 8 4 2 1 }; x &gt;&gt;=1 : { 4 2 1 0 }</pre></div>
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