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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::ranges::</span>copy_n, <span style="font-size:0.7em; line-height:130%">std::ranges::</span>copy_n_result</h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-algorithm.html">algorithm</a>&lrm; | <a href="cpp-algorithm-ranges.html">ranges</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code><a href="cpp-header-algorithm.html">&lt;algorithm&gt;</a></code></div>
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<div>&#35843;&#29992;&#31614;&#21517;</div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> std<span class="sy4">::</span><span class="me2">input_iterator</span> I, std<span class="sy4">::</span><span class="me2">weakly_incrementable</span> O <span class="sy1">&gt;</span><br /></span>
<p>&nbsp; requires std<span class="sy4">::</span><span class="me2">indirectly_copyable</span><span class="sy1">&lt;</span>I, O<span class="sy1">&gt;</span><br />
&nbsp; <span class="kw4">constexpr</span> copy_n_result<span class="sy1">&lt;</span>I, O<span class="sy1">&gt;</span><br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; copy_n<span class="br0">(</span> I first, std<span class="sy4">::</span><span class="me2">iter_difference_t</span><span class="sy1">&lt;</span>I<span class="sy1">&gt;</span> n, 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-cxx20">(C++20 &#36215;)</span></td>
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<div>&#36741;&#21161;&#31867;&#22411;</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> I, <span class="kw1">class</span> O <span class="sy1">&gt;</span><br />
&nbsp; <span class="kw1">using</span> copy_n_result <span class="sy1">=</span> ranges<span class="sy4">::</span><span class="me2">in_out_result</span><span class="sy1">&lt;</span>I, O<span class="sy1">&gt;</span><span class="sy4">;</span></span></div>
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<td>(2)</td>
<td><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></td>
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<div class="t-li1"><span class="t-li">1)</span> &#36890;&#36807;&#23545; <code>[0, n)</code> &#20013;&#30340;&#27599;&#20010;&#25972;&#25968;&#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> i<span class="br0">)</span> <span class="sy1">=</span> <span class="sy2">*</span><span class="br0">(</span>first <span class="sy2">+</span> i<span class="br0">)</span></span></span> &#65292;&#20934;&#30830;&#22797;&#21046; <code>n</code> &#20010;&#26469;&#33258;&#22987;&#20110; <code>first</code> &#30340;&#33539;&#22260;&#30340;&#20540;&#21040;&#22987;&#20110; <code>result</code> &#30340;&#33539;&#22260;&#12290;&#33509; <code>result</code> &#22312;&#33539;&#22260; <code>[first, first + n)</code> &#20869;&#21017;&#34892;&#20026;&#26410;&#23450;&#20041;&#65288;&#22312;&#27492;&#24773;&#20917;&#19979;&#21487;&#33021;&#21487;&#20197;&#29992; <span class="t-lc">ranges::copy_backward</span> &#20195;&#26367;&#65289;&#12290;</div>
<p>&#27492;&#39029;&#38754;&#19978;&#25551;&#36848;&#30340;&#20223;&#20989;&#25968;&#23454;&#20307;&#26159; <i>niebloid</i> &#65292;&#21363;&#65306;</p>
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<li>&#35843;&#29992;&#23427;&#20204;&#20013;&#30340;&#20219;&#20309;&#19968;&#32773;&#26102;&#19981;&#21487;&#25351;&#23450;&#26174;&#24335;&#27169;&#26495;&#23454;&#21442;&#12290;</li>
<li>&#23427;&#20204;&#26080;&#19968;&#23545;<a href="cpp-language-adl.html">&#23454;&#21442;&#20381;&#36182;&#26597;&#25214;</a>&#21487;&#35265;&#12290;</li>
<li>&#22312;<a href="cpp-language-unqualified_lookup.html">&#36890;&#24120;&#26080;&#38480;&#23450;&#26597;&#25214;</a>&#23547;&#25214;&#20989;&#25968;&#35843;&#29992;&#36816;&#31639;&#31526;&#24038;&#20391;&#30340;&#21517;&#31216;&#25214;&#21040;&#23427;&#20204;&#20043;&#19968;&#26102;&#65292;&#23427;&#31105;&#27490;<a href="cpp-language-adl.html">&#23454;&#21442;&#20381;&#36182;&#26597;&#25214;</a>&#12290;</li>
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<p>&#23454;&#38469;&#19978;&#65292;&#23427;&#20204;&#33021;&#20197;&#20989;&#25968;&#23545;&#35937;&#65292;&#25110;&#20197;&#26576;&#20123;&#29305;&#27530;&#32534;&#35793;&#22120;&#25193;&#23637;&#23454;&#29616;&#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
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<td>first</td>
<td>-</td>
<td>&#35201;&#22797;&#21046;&#30340;&#20803;&#32032;&#33539;&#22260;&#30340;&#36215;&#22987;</td>
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<td>n</td>
<td>-</td>
<td>&#35201;&#22797;&#21046;&#30340;&#20803;&#32032;&#25968;</td>
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<td>result</td>
<td>-</td>
<td>&#30446;&#26631;&#33539;&#22260;&#30340;&#36215;&#22987;</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><span class="t-c"><span class="mw-geshi cpp source-cpp">ranges<span class="sy4">::</span><span class="me2">copy_n_result</span><span class="br0">{</span>first <span class="sy2">+</span> n, result <span class="sy2">+</span> n<span class="br0">}</span></span></span> &#65292;&#25110;&#26356;&#27491;&#24335;&#22320;&#65292;&#21547;&#26377;&#19968;&#20010;&#31561;&#20110; <span class="t-c"><span class="mw-geshi cpp source-cpp">ranges<span class="sy4">::</span><span class="me2">next</span><span class="br0">(</span>first, n<span class="br0">)</span></span></span> &#30340; <span class="t-lc">std::input_iterator</span> &#36845;&#20195;&#22120;&#19982;&#19968;&#20010;&#31561;&#20110; <span class="t-c"><span class="mw-geshi cpp source-cpp">ranges<span class="sy4">::</span><span class="me2">next</span><span class="br0">(</span>result, n<span class="br0">)</span></span></span> &#30340; <span class="t-lc">std::weakly_incrementable</span> &#36845;&#20195;&#22120;&#30340; <span class="t-lc">ranges::in_out_result</span> &#31867;&#22411;&#20540;&#12290;</p>
<h3><span class="mw-headline" id=".E5.A4.8D.E6.9D.82.E5.BA.A6">&#22797;&#26434;&#24230;</span></h3>
<p>&#20934;&#30830;&#36171;&#20540; <code>n</code> &#27425;&#12290;</p>
<h3><span class="mw-headline" id=".E6.B3.A8.E8.A7.A3">&#27880;&#35299;</span></h3>
<p>&#23454;&#36341;&#20013;&#65292;&#33509;&#20540;&#31867;&#22411;&#20026;<a href="cpp-named_req-TriviallyCopyable.html"><span style="font-style:italic">&#21487;&#24179;&#20961;&#22797;&#21046;</span> <span style="font-family: Georgia, &#39;DejaVu Serif&#39;, serif; font-style:italic">(TriviallyCopyable)</span></a> &#24182;&#19988;&#36845;&#20195;&#22120;&#31867;&#22411;&#28385;&#36275; <a href="cpp-iterator-contiguous_iterator.html"><code>contiguous_iterator</code></a> &#65292;&#21017; <code>std::ranges::copy_n</code> &#30340;&#23454;&#29616;&#21487;&#20197;&#29992;&#22914; <span class="t-lc"><a href="cpp-string-byte-memmove.html">std::memmove</a></span> &#30340;&#25972;&#22359;&#22797;&#21046;&#20989;&#25968;&#36991;&#20813;&#22810;&#27425;&#36171;&#20540;&#12290;&#21478;&#22806;&#65292;&#36825;&#31181;&#22797;&#21046;&#21152;&#36895;&#21487;&#20197;&#30001;&#32534;&#35793;&#20248;&#21270;&#27880;&#20837;&#12290;</p>
<p>&#22312;&#22797;&#21046;&#37325;&#21472;&#30340;&#33539;&#22260;&#26102;&#65292; <code>std::ranges::copy_n</code> &#36866;&#21512;&#21521;&#24038;&#22797;&#21046;&#65288;&#30446;&#26631;&#33539;&#22260;&#30340;&#36215;&#22987;&#22312;&#28304;&#33539;&#22260;&#22806;&#65289;&#65292;&#32780; <span class="t-lc">std::ranges::copy_backward</span> &#36866;&#21512;&#21521;&#21491;&#22797;&#21046;&#65288;&#30446;&#26631;&#33539;&#22260;&#30340;&#26411;&#23614;&#22312;&#28304;&#33539;&#22260;&#22806;&#65289;&#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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<pre class="de1"><span class="kw1">struct</span> copy_n_fn <span class="br0">{</span>
<span class="kw1">template</span><span class="sy1">&lt;</span>std<span class="sy4">::</span><span class="me2">input_iterator</span> I, std<span class="sy4">::</span><span class="me2">weakly_incrementable</span> O<span class="sy1">&gt;</span>
requires std<span class="sy4">::</span><span class="me2">indirectly_copyable</span><span class="sy1">&lt;</span>I, O<span class="sy1">&gt;</span>
<span class="kw4">constexpr</span> ranges<span class="sy4">::</span><span class="me2">copy_n_result</span><span class="sy1">&lt;</span>I, O<span class="sy1">&gt;</span>
operator<span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>I first, std<span class="sy4">::</span><span class="me2">iter_difference_t</span><span class="sy1">&lt;</span>I<span class="sy1">&gt;</span> n, O result<span class="br0">)</span> <span class="kw4">const</span> <span class="br0">{</span>
<span class="kw1">for</span> <span class="br0">(</span>std<span class="sy4">::</span><span class="me2">iter_difference_t</span><span class="sy1">&lt;</span>I<span class="sy1">&gt;</span> i<span class="br0">{</span><span class="br0">}</span><span class="sy4">;</span> i <span class="sy3">!</span><span class="sy1">=</span> n<span class="sy4">;</span> <span class="sy2">++</span>i, <span class="sy2">++</span>first, <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>std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>first<span class="br0">)</span>, std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>result<span class="br0">)</span><span class="br0">}</span><span class="sy4">;</span>
<span class="br0">}</span>
<span class="br0">}</span><span class="sy4">;</span>
<span class="kw1">inline</span> <span class="kw4">constexpr</span> copy_n_fn copy_n<span class="br0">{</span><span class="br0">}</span><span class="sy4">;</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">
<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;algorithm&gt;</span>
<span class="co2">#include &lt;iterator&gt;</span>
<span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;iomanip&gt;</span>
<span class="co2">#include &lt;string&gt;</span>
<span class="co2">#include &lt;string_view&gt;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<span class="kw4">const</span> <a href="cpp-string-basic_string_view.html"><span class="kw1248">std::<span class="me2">string_view</span></span></a> in <span class="br0">{</span><span class="st0">&quot;ABCDEFGH&quot;</span><span class="br0">}</span><span class="sy4">;</span>
<a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a> out<span class="sy4">;</span>
std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">copy_n</span><span class="br0">(</span>in.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, <span class="nu0">4</span>, <a href="cpp-iterator-back_inserter.html"><span class="kw665">std::<span class="me2">back_inserter</span></span></a><span class="br0">(</span>out<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> <a href="cpp-io-manip-quoted.html"><span class="kw1802">std::<span class="me2">quoted</span></span></a><span class="br0">(</span>out<span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span>
out <span class="sy1">=</span> <span class="st0">&quot;abcdefgh&quot;</span><span class="sy4">;</span>
<span class="kw4">const</span> <span class="kw4">auto</span> res <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">copy_n</span><span class="br0">(</span>in.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, <span class="nu0">5</span>, out.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a>
<span class="sy1">&lt;&lt;</span> <span class="st0">&quot;*(res.in): &#39;&quot;</span> <span class="sy1">&lt;&lt;</span> <span class="sy2">*</span><span class="br0">(</span>res.<span class="me1">in</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;&#39;, distance: &quot;</span>
<span class="sy1">&lt;&lt;</span> <a href="cpp-iterator-distance.html"><span class="kw673">std::<span class="me2">distance</span></span></a><span class="br0">(</span><a href="cpp-iterator-begin.html"><span class="kw676">std::<span class="me2">begin</span></span></a><span class="br0">(</span>in<span class="br0">)</span>, res.<span class="me1">in</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span>
<span class="sy1">&lt;&lt;</span> <span class="st0">&quot;*(res.out): &#39;&quot;</span> <span class="sy1">&lt;&lt;</span> <span class="sy2">*</span><span class="br0">(</span>res.<span class="me1">out</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;&#39;, distance: &quot;</span>
<span class="sy1">&lt;&lt;</span> <a href="cpp-iterator-distance.html"><span class="kw673">std::<span class="me2">distance</span></span></a><span class="br0">(</span><a href="cpp-iterator-begin.html"><span class="kw676">std::<span class="me2">begin</span></span></a><span class="br0">(</span>out<span class="br0">)</span>, res.<span class="me1">out</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
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<p>&#36755;&#20986;&#65306;</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="text source-text">
<pre class="de1">&quot;ABCD&quot;
*(res.in): &#39;F&#39;, distance: 5
*(res.out): &#39;f&#39;, distance: 5</pre></div>
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<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-ranges-copy.html"><span class="t-lines"><span>ranges::copy</span><span>ranges::copy_if</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span><span><span class="t-mark-rev t-since-cxx20">(C++20)</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">(niebloid)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-algorithm-ranges-copy_backward.html"><span class="t-lines"><span>ranges::copy_backward</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></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">(niebloid)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-algorithm-ranges-remove_copy.html"><span class="t-lines"><span>ranges::remove_copy</span><span>ranges::remove_copy_if</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
</div>
</td>
<td>&#22797;&#21046;&#19968;&#20010;&#33539;&#22260;&#30340;&#20803;&#32032;&#65292;&#24573;&#30053;&#28385;&#36275;&#29305;&#23450;&#21028;&#21035;&#26631;&#20934;&#30340;&#20803;&#32032;<br />
<span class="t-mark">(niebloid)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-algorithm-ranges-replace_copy.html"><span class="t-lines"><span>ranges::replace_copy</span><span>ranges::replace_copy_if</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
</div>
</td>
<td>&#22797;&#21046;&#19968;&#20010;&#33539;&#22260;&#20869;&#30340;&#20803;&#32032;&#65292;&#24182;&#23558;&#28385;&#36275;&#29305;&#23450;&#21028;&#21035;&#26631;&#20934;&#30340;&#20803;&#32032;&#26367;&#25442;&#20026;&#21478;&#19968;&#20010;&#20540;<br />
<span class="t-mark">(niebloid)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-algorithm-ranges-reverse_copy.html"><span class="t-lines"><span>ranges::revserse_copy</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
</div>
</td>
<td>&#21019;&#24314;&#19968;&#20010;&#33539;&#22260;&#30340;&#36870;&#21521;&#21103;&#26412;<br />
<span class="t-mark">(niebloid)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-algorithm-ranges-rotate_copy.html"><span class="t-lines"><span>ranges::rotate_copy</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
</div>
</td>
<td>&#22797;&#21046;&#24182;&#26059;&#36716;&#20803;&#32032;&#33539;&#22260;<br />
<span class="t-mark">(niebloid)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-algorithm-ranges-unique_copy.html"><span class="t-lines"><span>ranges::unique_copy</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
</div>
</td>
<td>&#21019;&#24314;&#26576;&#33539;&#22260;&#30340;&#19981;&#21547;&#36830;&#32493;&#37325;&#22797;&#20803;&#32032;&#30340;&#21103;&#26412;<br />
<span class="t-mark">(niebloid)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-algorithm-ranges-move.html"><span class="t-lines"><span>ranges::move</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
</div>
</td>
<td>&#23558;&#26576;&#19968;&#33539;&#22260;&#30340;&#20803;&#32032;&#31227;&#21160;&#21040;&#19968;&#20010;&#26032;&#30340;&#20301;&#32622;<br />
<span class="t-mark">(niebloid)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-algorithm-ranges-move_backward.html"><span class="t-lines"><span>ranges::move_backword</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
</div>
</td>
<td>&#25353;&#20174;&#21518;&#24448;&#21069;&#30340;&#39034;&#24207;&#31227;&#21160;&#26576;&#19968;&#33539;&#22260;&#30340;&#20803;&#32032;&#21040;&#26032;&#30340;&#20301;&#32622;<br />
<span class="t-mark">(niebloid)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-algorithm-copy_n.html"><span class="t-lines"><span>copy_n</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
</div>
</td>
<td>&#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>
</table>
</div>
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