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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::experimental::ranges::</span>copy, <span style="font-size:0.7em; line-height:130%">std::experimental::ranges::</span>copy_if</h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-experimental.html">experimental</a>&lrm; | <a href="cpp-experimental-ranges.html">ranges</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code><a href="cpp-header-experimental-ranges-algorithm.html">&lt;experimental/ranges/algorithm&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> <a href="cpp-experimental-ranges-iterator-InputIterator.html"><span class="kw2569">ranges::<span class="me2">InputIterator</span></span></a> I, <a href="cpp-experimental-ranges-iterator-Sentinel.html"><span class="kw2567">ranges::<span class="me2">Sentinel</span></span></a><span class="sy1">&lt;</span>I<span class="sy1">&gt;</span> S,<br /></span>
<p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<a href="cpp-experimental-ranges-iterator-WeaklyIncrementable.html"><span class="kw2564">ranges::<span class="me2">WeaklyIncrementable</span></span></a> O <span class="sy1">&gt;</span><br />
&nbsp; requires <a href="cpp-experimental-ranges-iterator-IndirectlyCopyable.html"><span class="kw2581">ranges::<span class="me2">IndirectlyCopyable</span></span></a><span class="sy1">&lt;</span>I, O<span class="sy1">&gt;</span><br />
ranges<span class="sy4">::</span><span class="me2">tagged_pair</span><span class="sy1">&lt;</span>ranges<span class="sy4">::</span><span class="me2">tag</span><span class="sy4">::</span><span class="me2">in</span><span class="br0">(</span>I<span class="br0">)</span>, ranges<span class="sy4">::</span><span class="me2">tag</span><span class="sy4">::</span><span class="me2">out</span><span class="br0">(</span>O<span class="br0">)</span><span class="sy1">&gt;</span><br /></p>
&nbsp; copy<span class="br0">(</span>I first, S last, O result<span class="br0">)</span><span class="sy4">;</span></div>
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<td>(1)</td>
<td><span class="t-mark-rev t-since-ranges-ts t-mark-ts">(&#33539;&#22260; TS)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span> <span class="sy1">&lt;</span> <a href="cpp-experimental-ranges-range-InputRange.html"><span class="kw2592">ranges::<span class="me2">InputRange</span></span></a> Rng, <a href="cpp-experimental-ranges-iterator-WeaklyIncrementable.html"><span class="kw2564">ranges::<span class="me2">WeaklyIncrementable</span></span></a> O <span class="sy1">&gt;</span><br /></span>
<p>&nbsp; requires <a href="cpp-experimental-ranges-iterator-IndirectlyCopyable.html"><span class="kw2581">ranges::<span class="me2">IndirectlyCopyable</span></span></a><span class="sy1">&lt;</span>ranges<span class="sy4">::</span><span class="me2">iterator_t</span><span class="sy1">&lt;</span>Rng<span class="sy1">&gt;</span>, O<span class="sy1">&gt;</span><br />
ranges<span class="sy4">::</span><span class="me2">tagged_pair</span><span class="sy1">&lt;</span><br />
&nbsp; ranges<span class="sy4">::</span><span class="me2">tag</span><span class="sy4">::</span><span class="me2">in</span><span class="br0">(</span>ranges<span class="sy4">::</span><span class="me2">safe_iterator_t</span><span class="sy1">&lt;</span>Rng<span class="sy1">&gt;</span><span class="br0">)</span>, ranges<span class="sy4">::</span><span class="me2">tag</span><span class="sy4">::</span><span class="me2">out</span><span class="br0">(</span>O<span class="br0">)</span><span class="sy1">&gt;</span><br /></p>
&nbsp; copy<span class="br0">(</span>Rng<span class="sy3">&amp;&amp;</span> rng, O result<span class="br0">)</span><span class="sy4">;</span></div>
</td>
<td>(2)</td>
<td><span class="t-mark-rev t-since-ranges-ts t-mark-ts">(&#33539;&#22260; TS)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span> <span class="sy1">&lt;</span> <a href="cpp-experimental-ranges-iterator-InputIterator.html"><span class="kw2569">ranges::<span class="me2">InputIterator</span></span></a> I, <a href="cpp-experimental-ranges-iterator-Sentinel.html"><span class="kw2567">ranges::<span class="me2">Sentinel</span></span></a><span class="sy1">&lt;</span>I<span class="sy1">&gt;</span> S,<br /></span>
<p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<a href="cpp-experimental-ranges-iterator-WeaklyIncrementable.html"><span class="kw2564">ranges::<span class="me2">WeaklyIncrementable</span></span></a> O,<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span class="kw1">class</span> Proj <span class="sy1">=</span> ranges<span class="sy4">::</span><span class="me2">identity</span>,<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<a href="cpp-experimental-ranges-iterator-IndirectUnaryPredicate.html"><span class="kw2576">ranges::<span class="me2">IndirectUnaryPredicate</span></span></a><span class="sy1">&lt;</span><a href="cpp-experimental-ranges-iterator-projected.html"><span class="kw2597">ranges::<span class="me2">projected</span></span></a><span class="sy1">&lt;</span>I, Proj<span class="sy1">&gt;&gt;</span> Pred <span class="sy1">&gt;</span><br />
&nbsp; requires <a href="cpp-experimental-ranges-iterator-IndirectlyCopyable.html"><span class="kw2581">ranges::<span class="me2">IndirectlyCopyable</span></span></a><span class="sy1">&lt;</span>I, O<span class="sy1">&gt;</span><br />
ranges<span class="sy4">::</span><span class="me2">tagged_pair</span><span class="sy1">&lt;</span>ranges<span class="sy4">::</span><span class="me2">tag</span><span class="sy4">::</span><span class="me2">in</span><span class="br0">(</span>I<span class="br0">)</span>, ranges<span class="sy4">::</span><span class="me2">tag</span><span class="sy4">::</span><span class="me2">out</span><span class="br0">(</span>O<span class="br0">)</span><span class="sy1">&gt;</span><br /></p>
&nbsp; copy_if<span class="br0">(</span>I first, S last, O result, Pred pred, Proj proj <span class="sy1">=</span> Proj<span class="br0">{</span><span class="br0">}</span><span class="br0">)</span><span class="sy4">;</span></div>
</td>
<td>(3)</td>
<td><span class="t-mark-rev t-since-ranges-ts t-mark-ts">(&#33539;&#22260; TS)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span> <span class="sy1">&lt;</span> <a href="cpp-experimental-ranges-range-InputRange.html"><span class="kw2592">ranges::<span class="me2">InputRange</span></span></a> Rng, <a href="cpp-experimental-ranges-iterator-WeaklyIncrementable.html"><span class="kw2564">ranges::<span class="me2">WeaklyIncrementable</span></span></a> O,<br /></span>
<p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span class="kw1">class</span> Proj <span class="sy1">=</span> ranges<span class="sy4">::</span><span class="me2">identity</span>,<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<a href="cpp-experimental-ranges-iterator-IndirectUnaryPredicate.html"><span class="kw2576">ranges::<span class="me2">IndirectUnaryPredicate</span></span></a><span class="sy1">&lt;</span><br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<a href="cpp-experimental-ranges-iterator-projected.html"><span class="kw2597">ranges::<span class="me2">projected</span></span></a><span class="sy1">&lt;</span>ranges<span class="sy4">::</span><span class="me2">iterator_t</span><span class="sy1">&lt;</span>Rng<span class="sy1">&gt;</span>, Proj<span class="sy1">&gt;&gt;</span> Pred <span class="sy1">&gt;</span><br />
&nbsp; requires <a href="cpp-experimental-ranges-iterator-IndirectlyCopyable.html"><span class="kw2581">ranges::<span class="me2">IndirectlyCopyable</span></span></a><span class="sy1">&lt;</span>iterator_t<span class="sy1">&lt;</span>Rng<span class="sy1">&gt;</span>, O<span class="sy1">&gt;</span><br />
ranges<span class="sy4">::</span><span class="me2">tagged_pair</span><span class="sy1">&lt;</span><br />
&nbsp; ranges<span class="sy4">::</span><span class="me2">tag</span><span class="sy4">::</span><span class="me2">in</span><span class="br0">(</span>ranges<span class="sy4">::</span><span class="me2">safe_iterator_t</span><span class="sy1">&lt;</span>Rng<span class="sy1">&gt;</span><span class="br0">)</span>, ranges<span class="sy4">::</span><span class="me2">tag</span><span class="sy4">::</span><span class="me2">out</span><span class="br0">(</span>O<span class="br0">)</span><span class="sy1">&gt;</span><br /></p>
&nbsp; copy_if<span class="br0">(</span>Rng<span class="sy3">&amp;&amp;</span> rng, O result, Pred pred, Proj proj <span class="sy1">=</span> Proj<span class="br0">{</span><span class="br0">}</span><span class="br0">)</span><span class="sy4">;</span></div>
</td>
<td>(4)</td>
<td><span class="t-mark-rev t-since-ranges-ts t-mark-ts">(&#33539;&#22260; TS)</span></td>
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<p>&#22797;&#21046;&#28304;&#33539;&#22260;&#65288; <code>[first,last)</code> &#25110; <code>rng</code> &#65289;&#20013;&#30340;&#20803;&#32032;&#21040;&#22987;&#20110; <code>result</code> &#30340;&#30446;&#26631;&#33539;&#22260;&#20013;&#65292;&#20174;&#28304;&#33539;&#22260;&#30340;&#39318;&#20803;&#32032;&#24320;&#22987;&#65292;&#21518;&#32493;&#21040;&#26411;&#20803;&#32032;&#12290;</p>
<div class="t-li1"><span class="t-li">1)</span> &#22797;&#21046;&#33539;&#22260; <code>[first, last)</code> &#20013;&#30340;&#25152;&#26377;&#20803;&#32032;&#12290;&#23545;&#27599;&#20010;&#38750;&#36127;&#25972;&#25968; <code>n &lt; (last - first)</code> &#36827;&#34892; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span><span class="br0">(</span>result <span class="sy2">+</span> n<span class="br0">)</span> <span class="sy1">=</span> <span class="sy2">*</span><span class="br0">(</span>first <span class="sy2">+</span> n<span class="br0">)</span></span></span> &#12290;&#33509; <code>result</code> &#22312;&#33539;&#22260; <code>[first, last)</code> &#20869;&#21017;&#34892;&#20026;&#26410;&#23450;&#20041;&#12290;&#27492;&#24773;&#20917;&#19979;&#21487;&#29992; <span class="t-lc">ranges::copy_backward</span> &#20195;&#26367;&#12290;</div>
<div class="t-li1"><span class="t-li">2)</span> &#21516; <span class="t-v">(1)</span> &#65292;&#20294;&#20197; <code>rng</code> &#20026;&#28304;&#33539;&#22260;&#65292;&#22914;&#21516;&#29992; <span class="t-c"><span class="mw-geshi cpp source-cpp">ranges<span class="sy4">::</span><span class="me2">copy</span><span class="br0">(</span>ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>rng<span class="br0">)</span>, ranges<span class="sy4">::</span><span class="me2">end</span><span class="br0">(</span>rng<span class="br0">)</span>, result<span class="br0">)</span><span class="sy4">;</span></span></span> &#65292;&#38500;&#20102;&#19981;&#21487;&#22797;&#21046; <code>result</code> &#12290;</div>
<div class="t-li1"><span class="t-li">3)</span> &#20165;&#22797;&#21046;&#24212;&#29992;&#35859;&#35789; <code>pred</code> &#21040;&#25237;&#24433; <code>proj</code> &#25152;&#25237;&#24433;&#30340;&#20803;&#32032;&#20540;&#26102;&#65292;&#23545;&#20854;&#36820;&#22238; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> &#30340;&#20803;&#32032;&#12290;&#20445;&#25345;&#22797;&#21046;&#21518;&#30340;&#20803;&#32032;&#39034;&#24207;&#12290;&#33509;&#28304;&#19982;&#30446;&#26631;&#33539;&#22260;&#37325;&#21472;&#21017;&#34892;&#20026;&#26410;&#23450;&#20041;&#12290;</div>
<div class="t-li1"><span class="t-li">4)</span> &#21516; <span class="t-v">(3)</span> &#65292;&#20294;&#20197; <code>rng</code> &#20026;&#28304;&#33539;&#22260;&#65292;&#22914;&#21516;&#29992; <span class="t-c"><span class="mw-geshi cpp source-cpp">ranges<span class="sy4">::</span><span class="me2">copy_if</span><span class="br0">(</span>ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>rng<span class="br0">)</span>, ranges<span class="sy4">::</span><span class="me2">end</span><span class="br0">(</span>rng<span class="br0">)</span>, result, pred, proj<span class="br0">)</span><span class="sy4">;</span></span></span> &#65292;&#38500;&#20102;&#19981;&#21487;&#22797;&#21046; <code>result</code> &#12289; <code>pred</code> &#21644; <code>proj</code> &#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>first, last</td>
<td>-</td>
<td>&#35201;&#22797;&#21046;&#30340;&#20803;&#32032;&#33539;&#22260;</td>
</tr>
<tr class="t-par">
<td>rng</td>
<td>-</td>
<td>&#35201;&#22797;&#21046;&#30340;&#20803;&#32032;&#33539;&#22260;</td>
</tr>
<tr class="t-par">
<td>result</td>
<td>-</td>
<td>&#30446;&#26631;&#33539;&#22260;&#30340;&#36215;&#22987;</td>
</tr>
<tr class="t-par">
<td>pred</td>
<td>-</td>
<td>&#35201;&#24212;&#29992;&#21040;&#25237;&#24433;&#21518;&#20803;&#32032;&#30340;&#35859;&#35789;</td>
</tr>
<tr class="t-par">
<td>proj</td>
<td>-</td>
<td>&#35201;&#24212;&#29992;&#21040;&#20803;&#32032;&#30340;&#25237;&#24433;</td>
</tr>
</table>
<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<p>&#21547;&#26377;&#20197;&#19979;&#20108;&#20010;&#25104;&#21592;&#30340; <code>tagged_pair</code> &#23545;&#35937;&#65306;</p>
<ul>
<li>&#31532;&#19968;&#25104;&#21592;&#26377;&#26631;&#31614; <code>tag::in</code> &#65292;&#20026;&#28304;&#33539;&#22260;&#30340;&#23614;&#21518;&#36845;&#20195;&#22120;&#65288;&#21363;&#27604;&#36739;&#31561;&#20110;&#21736;&#20301; <code>last</code> &#30340; <code>I</code> &#31867;&#22411;&#36845;&#20195;&#22120;&#65289;&#12290;</li>
<li>&#31532;&#20108;&#25104;&#21592;&#26377;&#26631;&#31614; <code>tag::out</code> &#65292;&#20026;&#32467;&#26524;&#33539;&#22260;&#30340;&#23614;&#21518;&#36845;&#20195;&#22120;&#12290;</li>
</ul>
<h3><span class="mw-headline" id=".E5.A4.8D.E6.9D.82.E5.BA.A6">&#22797;&#26434;&#24230;</span></h3>
<div class="t-li1"><span class="t-li">1)</span> &#20934;&#30830;&#36171;&#20540; <span class="t-c"><span class="mw-geshi cpp source-cpp">ranges<span class="sy4">::</span><span class="me2">distance</span><span class="br0">(</span>first, last<span class="br0">)</span></span></span> &#27425;&#12290;</div>
<div class="t-li1"><span class="t-li">2)</span> &#20934;&#30830;&#36171;&#20540; <span class="t-c"><span class="mw-geshi cpp source-cpp">ranges<span class="sy4">::</span><span class="me2">distance</span><span class="br0">(</span>rng<span class="br0">)</span></span></span> &#27425;&#12290;</div>
<div class="t-li1"><span class="t-li">3)</span> &#20934;&#30830;&#24212;&#29992; <span class="t-c"><span class="mw-geshi cpp source-cpp">ranges<span class="sy4">::</span><span class="me2">distance</span><span class="br0">(</span>first, last<span class="br0">)</span></span></span> &#27425;&#23545;&#24212;&#30340;&#25237;&#24433;&#21644;&#35859;&#35789;&#12290;</div>
<div class="t-li1"><span class="t-li">3)</span> &#20934;&#30830;&#24212;&#29992; <span class="t-c"><span class="mw-geshi cpp source-cpp">ranges<span class="sy4">::</span><span class="me2">distance</span><span class="br0">(</span>rng<span class="br0">)</span></span></span> &#27425;&#23545;&#24212;&#30340;&#25237;&#24433;&#21644;&#35859;&#35789;&#12290;</div>
<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>
<table class="eq-fun-cpp-table">
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<th>&#29256;&#26412;&#19968;</th>
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<td>
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<div class="cpp source-cpp">
<pre class="de1"><span class="kw1">template</span> <span class="sy1">&lt;</span><a href="cpp-experimental-ranges-iterator-InputIterator.html"><span class="kw2569">ranges::<span class="me2">InputIterator</span></span></a> I, <a href="cpp-experimental-ranges-iterator-Sentinel.html"><span class="kw2567">ranges::<span class="me2">Sentinel</span></span></a><span class="sy1">&lt;</span>I<span class="sy1">&gt;</span> S, <a href="cpp-experimental-ranges-iterator-WeaklyIncrementable.html"><span class="kw2564">ranges::<span class="me2">WeaklyIncrementable</span></span></a> O<span class="sy1">&gt;</span>
requires <a href="cpp-experimental-ranges-iterator-IndirectlyCopyable.html"><span class="kw2581">ranges::<span class="me2">IndirectlyCopyable</span></span></a><span class="sy1">&lt;</span>I, O<span class="sy1">&gt;</span><span class="br0">(</span><span class="br0">)</span>
ranges<span class="sy4">::</span><span class="me2">tagged_pair</span><span class="sy1">&lt;</span>ranges<span class="sy4">::</span><span class="me2">tag</span><span class="sy4">::</span><span class="me2">in</span><span class="br0">(</span>I<span class="br0">)</span>, ranges<span class="sy4">::</span><span class="me2">tag</span><span class="sy4">::</span><span class="me2">out</span><span class="br0">(</span>O<span class="br0">)</span><span class="sy1">&gt;</span>
copy<span class="br0">(</span>I first, S last, O result<span class="br0">)</span>
<span class="br0">{</span>
<span class="kw1">for</span> <span class="br0">(</span><span class="sy4">;</span> first <span class="sy3">!</span><span class="sy1">=</span> last<span class="sy4">;</span> <span class="sy2">++</span>first, <span class="br0">(</span><span class="kw4">void</span><span class="br0">)</span><span class="sy2">++</span>result<span class="br0">)</span>
<span class="sy2">*</span>result <span class="sy1">=</span> <span class="sy2">*</span>first<span class="sy4">;</span>
<span class="kw1">return</span> <span class="br0">{</span>first, result<span class="br0">}</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
</div>
</td>
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<tr>
<th>&#29256;&#26412;&#20108;</th>
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<tr>
<td>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="cpp source-cpp">
<pre class="de1"><span class="kw1">template</span> <span class="sy1">&lt;</span><a href="cpp-experimental-ranges-range-InputRange.html"><span class="kw2592">ranges::<span class="me2">InputRange</span></span></a> Rng, <a href="cpp-experimental-ranges-iterator-WeaklyIncrementable.html"><span class="kw2564">ranges::<span class="me2">WeaklyIncrementable</span></span></a> O<span class="sy1">&gt;</span>
requires <a href="cpp-experimental-ranges-iterator-IndirectlyCopyable.html"><span class="kw2581">ranges::<span class="me2">IndirectlyCopyable</span></span></a><span class="sy1">&lt;</span>ranges<span class="sy4">::</span><span class="me2">iterator_t</span><span class="sy1">&lt;</span>Rng<span class="sy1">&gt;</span>, O<span class="sy1">&gt;</span><span class="br0">(</span><span class="br0">)</span>
ranges<span class="sy4">::</span><span class="me2">tagged_pair</span><span class="sy1">&lt;</span>ranges<span class="sy4">::</span><span class="me2">tag</span><span class="sy4">::</span><span class="me2">in</span><span class="br0">(</span>ranges<span class="sy4">::</span><span class="me2">safe_iterator_t</span><span class="sy1">&lt;</span>Rng<span class="sy1">&gt;</span><span class="br0">)</span>, ranges<span class="sy4">::</span><span class="me2">tag</span><span class="sy4">::</span><span class="me2">out</span><span class="br0">(</span>O<span class="br0">)</span><span class="sy1">&gt;</span>
copy<span class="br0">(</span>Rng<span class="sy3">&amp;&amp;</span> rng, O result<span class="br0">)</span>
<span class="br0">{</span>
<span class="kw1">return</span> ranges<span class="sy4">::</span><span class="me2">copy</span><span class="br0">(</span>ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>rng<span class="br0">)</span>, ranges<span class="sy4">::</span><span class="me2">end</span><span class="br0">(</span>rng<span class="br0">)</span>, result<span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
</div>
</td>
</tr>
<tr>
<th>&#29256;&#26412;&#19977;</th>
</tr>
<tr>
<td>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="cpp source-cpp">
<pre class="de1"><span class="kw1">template</span> <span class="sy1">&lt;</span><a href="cpp-experimental-ranges-iterator-InputIterator.html"><span class="kw2569">ranges::<span class="me2">InputIterator</span></span></a> I, <a href="cpp-experimental-ranges-iterator-Sentinel.html"><span class="kw2567">ranges::<span class="me2">Sentinel</span></span></a><span class="sy1">&lt;</span>I<span class="sy1">&gt;</span> S, <a href="cpp-experimental-ranges-iterator-WeaklyIncrementable.html"><span class="kw2564">ranges::<span class="me2">WeaklyIncrementable</span></span></a> O,
<span class="kw1">class</span> Proj <span class="sy1">=</span> ranges<span class="sy4">::</span><span class="me2">identity</span>,
<a href="cpp-experimental-ranges-iterator-IndirectUnaryPredicate.html"><span class="kw2576">ranges::<span class="me2">IndirectUnaryPredicate</span></span></a><span class="sy1">&lt;</span><a href="cpp-experimental-ranges-iterator-projected.html"><span class="kw2597">ranges::<span class="me2">projected</span></span></a><span class="sy1">&lt;</span>I, Proj<span class="sy1">&gt;&gt;</span> Pred<span class="sy1">&gt;</span>
requires <a href="cpp-experimental-ranges-iterator-IndirectlyCopyable.html"><span class="kw2581">ranges::<span class="me2">IndirectlyCopyable</span></span></a><span class="sy1">&lt;</span>I, O<span class="sy1">&gt;</span><span class="br0">(</span><span class="br0">)</span>
ranges<span class="sy4">::</span><span class="me2">tagged_pair</span><span class="sy1">&lt;</span>ranges<span class="sy4">::</span><span class="me2">tag</span><span class="sy4">::</span><span class="me2">in</span><span class="br0">(</span>I<span class="br0">)</span>, ranges<span class="sy4">::</span><span class="me2">tag</span><span class="sy4">::</span><span class="me2">out</span><span class="br0">(</span>O<span class="br0">)</span><span class="sy1">&gt;</span>
copy_if<span class="br0">(</span>I first, S last, O result, Pred pred, Proj proj <span class="sy1">=</span> Proj<span class="br0">{</span><span class="br0">}</span><span class="br0">)</span>
<span class="br0">{</span>
<span class="kw1">for</span> <span class="br0">(</span><span class="sy4">;</span> first <span class="sy3">!</span><span class="sy1">=</span> last<span class="sy4">;</span> <span class="sy2">++</span>first<span class="br0">)</span> <span class="br0">{</span>
<span class="kw1">if</span> <span class="br0">(</span>ranges<span class="sy4">::</span><span class="me2">invoke</span><span class="br0">(</span>pred, ranges<span class="sy4">::</span><span class="me2">invoke</span><span class="br0">(</span>proj, <span class="sy2">*</span>first<span class="br0">)</span><span class="br0">)</span><span class="br0">)</span><span class="br0">{</span>
<span class="sy2">*</span>result <span class="sy1">=</span> <span class="sy2">*</span>first<span class="sy4">;</span>
<span class="sy2">++</span>result<span class="sy4">;</span>
<span class="br0">}</span>
<span class="br0">}</span>
<span class="kw1">return</span> <span class="br0">{</span>first, result<span class="br0">}</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
</div>
</td>
</tr>
<tr>
<th>&#29256;&#26412;&#22235;</th>
</tr>
<tr>
<td>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="cpp source-cpp">
<pre class="de1"><span class="kw1">template</span> <span class="sy1">&lt;</span><a href="cpp-experimental-ranges-range-InputRange.html"><span class="kw2592">ranges::<span class="me2">InputRange</span></span></a> Rng, <a href="cpp-experimental-ranges-iterator-WeaklyIncrementable.html"><span class="kw2564">ranges::<span class="me2">WeaklyIncrementable</span></span></a> O,
<span class="kw1">class</span> Proj <span class="sy1">=</span> ranges<span class="sy4">::</span><span class="me2">identity</span>,
<a href="cpp-experimental-ranges-iterator-IndirectUnaryPredicate.html"><span class="kw2576">ranges::<span class="me2">IndirectUnaryPredicate</span></span></a><span class="sy1">&lt;</span>
<a href="cpp-experimental-ranges-iterator-projected.html"><span class="kw2597">ranges::<span class="me2">projected</span></span></a><span class="sy1">&lt;</span>ranges<span class="sy4">::</span><span class="me2">iterator_t</span><span class="sy1">&lt;</span>Rng<span class="sy1">&gt;</span>, Proj<span class="sy1">&gt;&gt;</span> Pred<span class="sy1">&gt;</span>
requires <a href="cpp-experimental-ranges-iterator-IndirectlyCopyable.html"><span class="kw2581">ranges::<span class="me2">IndirectlyCopyable</span></span></a><span class="sy1">&lt;</span>ranges<span class="sy4">::</span><span class="me2">iterator_t</span><span class="sy1">&lt;</span>Rng<span class="sy1">&gt;</span>, O<span class="sy1">&gt;</span><span class="br0">(</span><span class="br0">)</span>
ranges<span class="sy4">::</span><span class="me2">tagged_pair</span><span class="sy1">&lt;</span>ranges<span class="sy4">::</span><span class="me2">tag</span><span class="sy4">::</span><span class="me2">in</span><span class="br0">(</span>ranges<span class="sy4">::</span><span class="me2">safe_iterator_t</span><span class="sy1">&lt;</span>Rng<span class="sy1">&gt;</span><span class="br0">)</span>, ranges<span class="sy4">::</span><span class="me2">tag</span><span class="sy4">::</span><span class="me2">out</span><span class="br0">(</span>O<span class="br0">)</span><span class="sy1">&gt;</span>
copy_if<span class="br0">(</span>Rng<span class="sy3">&amp;&amp;</span> rng, O result, Pred pred, Proj proj <span class="sy1">=</span> Proj<span class="br0">{</span><span class="br0">}</span><span class="br0">)</span>
<span class="br0">{</span>
<span class="kw1">return</span> ranges<span class="sy4">::</span><span class="me2">copy_if</span><span class="br0">(</span>ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>rng<span class="br0">)</span>, ranges<span class="sy4">::</span><span class="me2">end</span><span class="br0">(</span>rng<span class="br0">)</span>, result, pred, proj<span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
</div>
</td>
</tr>
</table>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
<div class="t-example">
<p>&#19979;&#21015;&#20195;&#30721;&#29992; copy &#22797;&#21046;&#19968;&#20010; <code>vector</code> &#30340;&#20869;&#23481;&#32473;&#21478;&#19968;&#20010;&#65292;&#24182;&#26174;&#31034;&#32467;&#26524; <code>vector</code> &#65306;</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;experimental/ranges/algorithm&gt;</span>
<span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;vector&gt;</span>
<span class="co2">#include &lt;experimental/ranges/iterator&gt;</span>
<span class="co2">#include &lt;numeric&gt;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<span class="co1">// &#21442;&#38405; http://zh.cppreference.com/w/cpp/language/namespace_alias</span>
<span class="kw1">namespace</span> ranges <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">experimental</span><span class="sy4">::</span><span class="me2">ranges</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> from_vector<span class="br0">(</span><span class="nu0">10</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-algorithm-iota.html"><span class="kw1655">std::<span class="me2">iota</span></span></a><span class="br0">(</span>from_vector.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, from_vector.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span>, <span class="nu0">0</span><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> to_vector<span class="sy4">;</span>
ranges<span class="sy4">::</span><span class="me2">copy_if</span><span class="br0">(</span>from_vector.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, from_vector.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span>,
ranges<span class="sy4">::</span><span class="me2">back_inserter</span><span class="br0">(</span>to_vector<span class="br0">)</span>,
<span class="br0">[</span><span class="br0">]</span><span class="br0">(</span><span class="kw4">const</span> <span class="kw4">auto</span> i<span class="br0">)</span> <span class="br0">{</span>
<span class="kw1">return</span> i <span class="sy2">%</span> <span class="nu0">3</span><span class="sy4">;</span>
<span class="br0">}</span><span class="br0">)</span><span class="sy4">;</span>
<span class="co1">// &#25110;&#26367;&#29992;&#30340;</span>
<span class="co1">// std::vector&lt;int&gt; to_vector(from_vector.size());</span>
<span class="co1">// std::copy(from_vector, to_vector.begin());</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;to_vector contains: &quot;</span><span class="sy4">;</span>
ranges<span class="sy4">::</span><span class="me2">copy</span><span class="br0">(</span>to_vector, ranges<span class="sy4">::</span><span class="me2">ostream_iterator</span><span class="sy1">&lt;</span><span class="kw4">int</span><span class="sy1">&gt;</span><span class="br0">(</span><a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a>, <span class="st0">&quot; &quot;</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">&#39;<span class="es1">\n</span>&#39;</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">to_vector contains: 1 2 4 5 7 8</pre></div>
</div>
</div>
<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-algorithm-copy.html"><span class="t-lines"><span>copy</span><span>copy_if</span></span></a></div>
<div><span class="t-lines"><span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
</div>
</td>
<td>&#23558;&#26576;&#19968;&#33539;&#22260;&#30340;&#20803;&#32032;&#22797;&#21046;&#21040;&#19968;&#20010;&#26032;&#30340;&#20301;&#32622;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="https://zh.cppreference.com/mwiki/index.php?title=cpp/experimental/ranges/algorithm/copy_backward&amp;action=edit&amp;redlink=1" class="new" title="cpp/experimental/ranges/algorithm/copy backward&#65288;&#39029;&#38754;&#19981;&#23384;&#22312;&#65289;"><span class="t-lines"><span>copy_backward</span></span></a></div>
</div>
</td>
<td>&#25353;&#20174;&#21518;&#24448;&#21069;&#30340;&#39034;&#24207;&#22797;&#21046;&#19968;&#20010;&#33539;&#22260;&#20869;&#30340;&#20803;&#32032;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="https://zh.cppreference.com/mwiki/index.php?title=cpp/experimental/ranges/algorithm/reverse_copy&amp;action=edit&amp;redlink=1" class="new" title="cpp/experimental/ranges/algorithm/reverse copy&#65288;&#39029;&#38754;&#19981;&#23384;&#22312;&#65289;"><span class="t-lines"><span>reverse_copy</span></span></a></div>
</div>
</td>
<td>&#21019;&#24314;&#19968;&#20010;&#33539;&#22260;&#30340;&#36870;&#21521;&#21103;&#26412;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="https://zh.cppreference.com/mwiki/index.php?title=cpp/experimental/ranges/algorithm/copy_n&amp;action=edit&amp;redlink=1" class="new" title="cpp/experimental/ranges/algorithm/copy n&#65288;&#39029;&#38754;&#19981;&#23384;&#22312;&#65289;"><span class="t-lines"><span>copy_n</span></span></a></div>
</div>
</td>
<td>&#23558;&#19968;&#23450;&#25968;&#30446;&#30340;&#20803;&#32032;&#22797;&#21046;&#21040;&#19968;&#20010;&#26032;&#30340;&#20301;&#32622;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="https://zh.cppreference.com/mwiki/index.php?title=cpp/experimental/ranges/algorithm/fill&amp;action=edit&amp;redlink=1" class="new" title="cpp/experimental/ranges/algorithm/fill&#65288;&#39029;&#38754;&#19981;&#23384;&#22312;&#65289;"><span class="t-lines"><span>fill</span></span></a></div>
</div>
</td>
<td>&#23558;&#19968;&#20010;&#29305;&#23450;&#20540;&#36171;&#20540;&#32473;&#19968;&#20010;&#20803;&#32032;&#33539;&#22260;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="https://zh.cppreference.com/mwiki/index.php?title=cpp/experimental/ranges/algorithm/remove_copy&amp;action=edit&amp;redlink=1" class="new" title="cpp/experimental/ranges/algorithm/remove copy&#65288;&#39029;&#38754;&#19981;&#23384;&#22312;&#65289;"><span class="t-lines"><span>remove_copy</span><span>remove_copy_if</span></span></a></div>
</div>
</td>
<td>&#22797;&#21046;&#20803;&#32032;&#33539;&#22260;&#65292;&#24573;&#30053;&#28385;&#36275;&#29305;&#23450;&#21028;&#21035;&#26631;&#20934;&#30340;&#20803;&#32032;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
</tr>
</table>
</div>
<div class="visualClear"></div>
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