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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[]</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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<td rowspan="142">(1)</td>
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<div><span class="mw-geshi cpp source-cpp">T &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;operator<span class="br0">[</span><span class="br0">]</span><span class="br0">(</span> <a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> pos <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-until-cxx11">(C++11 &#21069;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">const</span> T<span class="sy3">&amp;</span> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; operator<span class="br0">[</span><span class="br0">]</span><span class="br0">(</span> <a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> pos <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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<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">T<span class="sy3">&amp;</span> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; operator<span class="br0">[</span><span class="br0">]</span><span class="br0">(</span> <a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> pos <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(2)</td>
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<div><span class="mw-geshi cpp source-cpp"><a href="cpp-numeric-valarray.html"><span class="kw1473">std::<span class="me2">valarray</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> &nbsp; &nbsp; &nbsp; operator<span class="br0">[</span><span class="br0">]</span><span class="br0">(</span> <a href="cpp-numeric-valarray-slice.html"><span class="kw1474">std::<span class="me2">slice</span></span></a> slicearr <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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<div><span class="mw-geshi cpp source-cpp"><a href="cpp-numeric-valarray-slice_array.html"><span class="kw1476">std::<span class="me2">slice_array</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> &nbsp; &nbsp;operator<span class="br0">[</span><span class="br0">]</span><span class="br0">(</span> <a href="cpp-numeric-valarray-slice.html"><span class="kw1474">std::<span class="me2">slice</span></span></a> slicearr <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(4)</td>
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<div><span class="mw-geshi cpp source-cpp"><a href="cpp-numeric-valarray.html"><span class="kw1473">std::<span class="me2">valarray</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> &nbsp; &nbsp; &nbsp; operator<span class="br0">[</span><span class="br0">]</span><span class="br0">(</span> <span class="kw4">const</span> <a href="cpp-numeric-valarray-gslice.html"><span class="kw1475">std::<span class="me2">gslice</span></span></a><span class="sy3">&amp;</span> gslicearr <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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<div><span class="mw-geshi cpp source-cpp"><a href="cpp-numeric-valarray-gslice_array.html"><span class="kw1477">std::<span class="me2">gslice_array</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> &nbsp; operator<span class="br0">[</span><span class="br0">]</span><span class="br0">(</span> <span class="kw4">const</span> <a href="cpp-numeric-valarray-gslice.html"><span class="kw1475">std::<span class="me2">gslice</span></span></a><span class="sy3">&amp;</span> gslicearr <span class="br0">)</span><span class="sy4">;</span></span></div>
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<div><span class="mw-geshi cpp source-cpp"><a href="cpp-numeric-valarray.html"><span class="kw1473">std::<span class="me2">valarray</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> &nbsp; &nbsp; &nbsp; operator<span class="br0">[</span><span class="br0">]</span><span class="br0">(</span> <span class="kw4">const</span> valarray<span class="sy1">&lt;</span><span class="kw4">bool</span><span class="sy1">&gt;</span><span class="sy3">&amp;</span> boolarr <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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<td>(7)</td>
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<div><span class="mw-geshi cpp source-cpp"><a href="cpp-numeric-valarray-mask_array.html"><span class="kw1478">std::<span class="me2">mask_array</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> &nbsp; &nbsp; operator<span class="br0">[</span><span class="br0">]</span><span class="br0">(</span> <span class="kw4">const</span> valarray<span class="sy1">&lt;</span><span class="kw4">bool</span><span class="sy1">&gt;</span><span class="sy3">&amp;</span> boolarr <span class="br0">)</span><span class="sy4">;</span></span></div>
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<div><span class="mw-geshi cpp source-cpp"><a href="cpp-numeric-valarray.html"><span class="kw1473">std::<span class="me2">valarray</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> &nbsp; &nbsp; &nbsp; operator<span class="br0">[</span><span class="br0">]</span><span class="br0">(</span> <span class="kw4">const</span> valarray<span class="sy1">&lt;</span><a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a><span class="sy1">&gt;</span><span class="sy3">&amp;</span> indarr <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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<td>(9)</td>
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<div><span class="mw-geshi cpp source-cpp"><a href="cpp-numeric-valarray-indirect_array.html"><span class="kw1479">std::<span class="me2">indirect_array</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span> operator<span class="br0">[</span><span class="br0">]</span><span class="br0">(</span> <span class="kw4">const</span> valarray<span class="sy1">&lt;</span><a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a><span class="sy1">&gt;</span><span class="sy3">&amp;</span> indarr <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(10)</td>
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<p>&#33719;&#21462;&#25968;&#32452;&#30340;&#21333;&#20010;&#20803;&#32032;&#25110;&#19968;&#37096;&#20998;&#12290;</p>
<p><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">const</span></span></span> &#37325;&#36733;&#36820;&#22238;&#20803;&#32032;&#24207;&#21015;&#65292;&#24182;&#21019;&#24314;&#26032;&#30340; <span class="t-lc"><a href="cpp-numeric-valarray.html">std::valarray</a></span> &#23545;&#35937;&#12290; &#38750; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">const</span></span></span> &#37325;&#36733;&#36820;&#22238;&#25345;&#26377;&#21040;&#25968;&#32452;&#20803;&#32032;&#24341;&#29992;&#30340;&#31867;&#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
<table class="metadata plainlinks ambox mbox-small-left ambox-notice" style="">
<tr>
<td class="mbox-empty-cell"></td>
<td class="mbox-text" style="">&#26412;&#33410;&#26410;&#23436;&#25104;<br />
&#21407;&#22240;&#65306;&#35299;&#37322;&#21442;&#25968;</td>
</tr>
</table>
<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<div class="t-li1"><span class="t-li">1,2)</span> &#21040;&#23545;&#24212;&#20803;&#32032;&#30340;&#24341;&#29992;</div>
<div class="t-li1"><span class="t-li">3,5,7,9)</span> &#21547;&#26377;&#34987;&#36873;&#25321;&#39033;&#21103;&#26412;&#30340; <span class="t-lc"><a href="cpp-numeric-valarray.html">std::valarray</a></span> &#23545;&#35937;</div>
<div class="t-li1"><span class="t-li">4,6,8,10)</span> &#21253;&#21547;&#21040;&#34987;&#36873;&#25321;&#39033;&#24341;&#29992;&#30340;&#23545;&#24212;&#25968;&#25454;&#32467;&#26500;</div>
<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=".E5.89.8D.E6.9D.A1.E4.BB.B6">&#21069;&#26465;&#20214;</span></h3>
<p>&#34987;&#36873;&#25321;&#20803;&#32032;&#24517;&#39035;&#23384;&#22312;&#12290;</p>
<h3><span class="mw-headline" id=".E6.B3.A8.E8.A7.A3">&#27880;&#35299;</span></h3>
<ul>
<li>&#23545;&#20110;&#20855;&#20307;&#30340;&#20540; <code><b>i</b></code> &#19982; <code><b>j</b></code> &#65292;&#19979;&#21015;&#23646;&#24615;&#20026; true &#65306;</li>
</ul>
<div class="t-li1"><span class="t-li">1)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="br0">(</span>a<span class="br0">[</span>i<span class="br0">]</span> <span class="sy1">=</span> q, a<span class="br0">[</span>i<span class="br0">]</span><span class="br0">)</span> <span class="sy1">==</span> q</span></span>
<dl>
<dd>&#23545;&#20110;&#38750; const &#30340; <code><b>a</b></code> &#12290;</dd>
</dl>
</div>
<div class="t-li1"><span class="t-li">2)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy3">&amp;</span>a<span class="br0">[</span>i<span class="sy2">+</span>j<span class="br0">]</span> <span class="sy1">==</span> <span class="sy3">&amp;</span>a<span class="br0">[</span>i<span class="br0">]</span> <span class="sy2">+</span> j</span></span>
<dl>
<dd>&#36825;&#34920;&#31034; valarray &#20803;&#32032;&#22312;&#20869;&#23384;&#20013;&#27607;&#37051;&#12290;</dd>
</dl>
</div>
<div class="t-li1"><span class="t-li">3)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy3">&amp;</span>a<span class="br0">[</span>i<span class="br0">]</span> <span class="sy3">!</span><span class="sy1">=</span> <span class="sy3">&amp;</span>b<span class="br0">[</span>j<span class="br0">]</span></span></span>
<dl>
<dd>&#36825;&#23545;&#20110;&#27599;&#20010;&#20114;&#19981;&#20026;&#21035;&#31216;&#30340;&#23545;&#35937; <code><b>a</b></code> &#19982; <code><b>b</b></code> &#25104;&#31435;&#12290;</dd>
<dd>&#36825;&#34920;&#31034;&#20803;&#32032;&#27809;&#26377;&#21035;&#31216;&#65292;&#32780;&#19988;&#27492;&#23646;&#24615;&#21487;&#29992;&#20110;&#36827;&#34892;&#26576;&#20123;&#31867;&#22411;&#30340;&#20248;&#21270;&#12290;</dd>
</dl>
</div>
<ul>
<li>&#22312; <a href="cpp-numeric-valarray-resize.html">resize</a> &#25110;&#25968;&#32452;&#26512;&#26500;&#26102;&#24341;&#29992;&#21464;&#20026;&#38750;&#27861;&#12290;</li>
</ul>
<p>&#23545;&#20110;&#37325;&#36733; <span class="t-v">(3,5,7,9)</span> &#65292;&#20989;&#25968;&#33021;&#23454;&#29616;&#20026;&#25317;&#26377;&#19981;&#21516;&#20110; <span class="t-lc"><a href="cpp-numeric-valarray.html">std::valarray</a></span> &#30340;&#36820;&#22238;&#31867;&#22411;&#12290;&#27492;&#24773;&#20917;&#19979;&#65292;&#26367;&#25442;&#31867;&#22411;&#25317;&#26377;&#19979;&#21015;&#23646;&#24615;&#65306;</p>
<dl>
<dd>
<ul>
<li>&#25552;&#20379; <span class="t-lc"><a href="cpp-numeric-valarray.html">std::valarray</a></span> &#30340;&#25152;&#26377; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">const</span></span></span> &#25104;&#21592;&#20989;&#25968;&#12290;</li>
<li>&#33021;&#20174;&#26367;&#25442;&#31867;&#22411;&#26500;&#36896; <span class="t-lc"><a href="cpp-numeric-valarray.html">std::valarray</a></span> &#12289; <span class="t-lc"><a href="cpp-numeric-valarray-slice_array.html">std::slice_array</a></span> &#12289; <span class="t-lc"><a href="cpp-numeric-valarray-gslice_array.html">std::gslice_array</a></span> &#12289; <span class="t-lc"><a href="cpp-numeric-valarray-mask_array.html">std::mask_array</a></span> &#21644; <span class="t-lc"><a href="cpp-numeric-valarray-indirect_array.html">std::indirect_array</a></span> &#12290;</li>
<li>&#25152;&#26377;&#25509;&#21463;&#19968;&#20010; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">const</span> <a href="cpp-numeric-valarray.html"><span class="kw1473">std::<span class="me2">valarray</span></span></a><span class="sy3">&amp;</span></span></span> &#31867;&#22411;&#21442;&#25968;&#30340;&#20989;&#25968;<span class="t-rev-inl t-since-cxx11"><span>&#65292;&#38500;&#20102; <a href="cpp-numeric-valarray-begin2.html"><tt>begin()</tt></a> &#21644; <a href="cpp-numeric-valarray-end2.html"><tt>end()</tt></a></span> <span><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></span></span>&#20063;&#24212;&#35813;&#25509;&#21463;&#26367;&#25442;&#31867;&#22411;&#12290;</li>
<li>&#25152;&#26377;&#25509;&#21463;&#20108;&#20010; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">const</span> <a href="cpp-numeric-valarray.html"><span class="kw1473">std::<span class="me2">valarray</span></span></a><span class="sy3">&amp;</span></span></span> &#31867;&#22411;&#21442;&#25968;&#30340;&#20989;&#25968;&#37117;&#24212;&#35813;&#25509;&#21463; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">const</span> <a href="cpp-numeric-valarray.html"><span class="kw1473">std::<span class="me2">valarray</span></span></a><span class="sy3">&amp;</span></span></span> &#21644;&#26367;&#25442;&#31867;&#22411;&#30340;&#27599;&#31181;&#32452;&#21512;&#12290;</li>
<li>&#36820;&#22238;&#31867;&#22411;&#28155;&#21152;&#19981;&#22810;&#20110;&#20108;&#23618;&#23884;&#22871;&#22312;&#26368;&#28145;&#23618;&#23884;&#22871;&#30340;&#21442;&#25968;&#31867;&#22411;&#19978;&#30340;&#27169;&#26495;&#12290;</li>
</ul>
</dd>
</dl>
<p>&#20999;&#29255;/&#25513;&#30721;/&#38388;&#25509;&#35775;&#38382;&#19981;&#36830;&#38145;&#65306; <span class="t-c"><span class="mw-geshi cpp source-cpp">v<span class="br0">[</span>v<span class="sy1">==</span>n<span class="br0">]</span><span class="br0">[</span><a href="cpp-numeric-valarray-slice.html"><span class="kw1474">std::<span class="me2">slice</span></span></a><span class="br0">(</span><span class="nu0">0</span>,<span class="nu0">5</span>,<span class="nu0">2</span><span class="br0">)</span><span class="br0">]</span> <span class="sy1">=</span> x<span class="sy4">;</span></span></span> &#26159;&#38169;&#35823;&#65292;&#22240;&#20026; <span class="t-lc"><a href="cpp-numeric-valarray-mask_array.html">std::mask_array</a></span> &#65288; <span class="t-c"><span class="mw-geshi cpp source-cpp">v<span class="br0">[</span>v<span class="sy1">==</span>n<span class="br0">]</span></span></span> &#30340;&#31867;&#22411;&#65289;&#26080; <code>operator[]</code> &#12290;</p>
<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;valarray&gt;</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> data <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">3</span>,<span class="nu0">4</span>,<span class="nu0">5</span>,<span class="nu0">6</span>,<span class="nu0">7</span>,<span class="nu0">8</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;Initial valarray: &quot;</span><span class="sy4">;</span>
<span class="kw1">for</span><span class="br0">(</span><span class="kw4">int</span> n<span class="sy4">:</span> data<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> n <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">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span>
data<span class="br0">[</span>data <span class="sy1">&gt;</span> <span class="nu0">5</span><span class="br0">]</span> <span class="sy1">=</span> <span class="sy2">-</span><span class="nu0">1</span><span class="sy4">;</span> <span class="co1">// operator[] &#30340; valarray&lt;bool&gt; &#37325;&#36733;</span>
<span class="co1">// data&gt;5 &#30340;&#31867;&#22411;&#26159; std::valarray&lt;bool&gt;</span>
<span class="co1">// data[data&gt;5] &#30340;&#31867;&#22411;&#26159; std::mask_array&lt;int&gt;</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 v[v&gt;5]=-1: &quot;</span><span class="sy4">;</span>
<span class="kw1">for</span><span class="br0">(</span><a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> n <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span> n <span class="sy1">&lt;</span> data.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="sy2">++</span>n<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> data<span class="br0">[</span>n<span class="br0">]</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39; &#39;</span><span class="sy4">;</span> <span class="co1">// &#24120;&#35268; operator[]</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">&#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">Initial valarray: 0 1 2 3 4 5 6 7 8 9
After v[v&gt;5]=-1: 0 1 2 3 4 5 -1 -1 -1 -1</pre></div>
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