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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::ranges::</span>fill_n</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> <span class="kw1">class</span> T, std<span class="sy4">::</span><span class="me2">output_iterator</span><span class="sy1">&lt;</span><span class="kw4">const</span> T<span class="sy3">&amp;</span><span class="sy1">&gt;</span> O <span class="sy1">&gt;</span><br />
<span class="kw4">constexpr</span> O fill_n<span class="br0">(</span> O first, std<span class="sy4">::</span><span class="me2">iter_difference_t</span><span class="sy1">&lt;</span>O<span class="sy1">&gt;</span> n, <span class="kw4">const</span> T<span class="sy3">&amp;</span> value <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></td>
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<p>&#36171;&#20540;&#32473;&#23450;&#30340; <code>value</code> &#32473;&#33539;&#22260; <code>[first, first + n)</code> &#20013;&#30340;&#25152;&#26377;&#20803;&#32032;&#12290;</p>
<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;&#20462;&#25913;&#30340;&#20803;&#32032;&#33539;&#22260;&#30340;&#36215;&#22987;</td>
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<td>n</td>
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<td>&#35201;&#20462;&#25913;&#30340;&#20803;&#32032;&#25968;</td>
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<td>value</td>
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<td>&#35201;&#36171;&#30340;&#20540;</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>&#27604;&#36739;&#31561;&#20110; <code>first + n</code> &#30340;&#36845;&#20195;&#22120;&#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=".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> fill_n_fn <span class="br0">{</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T, std<span class="sy4">::</span><span class="me2">output_iterator</span><span class="sy1">&lt;</span><span class="kw4">const</span> T<span class="sy3">&amp;</span><span class="sy1">&gt;</span> O<span class="sy1">&gt;</span>
<span class="kw4">constexpr</span> O operator<span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>O first, std<span class="sy4">::</span><span class="me2">iter_difference_t</span><span class="sy1">&lt;</span>O<span class="sy1">&gt;</span> n, <span class="kw4">const</span> T<span class="sy3">&amp;</span> value<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>O<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>first <span class="sy1">=</span> value, <span class="sy2">++</span>first, <span class="sy2">++</span>i<span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">return</span> first<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> fill_n_fn fill_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">
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<div class="cpp source-cpp">
<pre class="de1"><span class="co2">#include &lt;algorithm&gt;</span>
<span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;string&gt;</span>
<span class="co2">#include &lt;vector&gt;</span>
<span class="kw4">auto</span> print<span class="br0">(</span><span class="kw4">const</span> <span class="kw4">auto</span><span class="sy3">&amp;</span> v<span class="br0">)</span> <span class="br0">{</span>
<span class="kw1">for</span> <span class="br0">(</span><span class="kw4">const</span> <span class="kw4">auto</span><span class="sy3">&amp;</span> elem <span class="sy4">:</span> v<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> elem <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="st0">&#39;<span class="es1">\n</span>&#39;</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>
<span class="kw4">constexpr</span> <span class="kw4">auto</span> n<span class="br0">{</span><span class="nu0">8</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><a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a><span class="sy1">&gt;</span> v<span class="br0">(</span>n, <span class="st0">&quot;&#9617;&#9617;&quot;</span><span class="br0">)</span><span class="sy4">;</span>
print<span class="br0">(</span>v<span class="br0">)</span><span class="sy4">;</span>
std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">fill_n</span><span class="br0">(</span>v.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, n, <span class="st0">&quot;&#9619;&#9619;&quot;</span><span class="br0">)</span><span class="sy4">;</span>
print<span class="br0">(</span>v<span class="br0">)</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">&#9617;&#9617; &#9617;&#9617; &#9617;&#9617; &#9617;&#9617; &#9617;&#9617; &#9617;&#9617; &#9617;&#9617; &#9617;&#9617;
&#9619;&#9619; &#9619;&#9619; &#9619;&#9619; &#9619;&#9619; &#9619;&#9619; &#9619;&#9619; &#9619;&#9619; &#9619;&#9619;</pre></div>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">&#21442;&#38405;</span></h3>
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<div><a href="cpp-algorithm-ranges-fill.html"><span class="t-lines"><span>ranges::fill</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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<td>&#23558;&#19968;&#20010;&#32473;&#23450;&#20540;&#22797;&#21046;&#36171;&#20540;&#32473;&#19968;&#20010;&#33539;&#22260;&#20869;&#30340;&#27599;&#20010;&#20803;&#32032;<br />
<span class="t-mark">(niebloid)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-algorithm-ranges-copy_n.html"><span class="t-lines"><span>ranges::copy_n</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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<td>&#23558;&#19968;&#23450;&#25968;&#30446;&#30340;&#20803;&#32032;&#22797;&#21046;&#21040;&#19968;&#20010;&#26032;&#30340;&#20301;&#32622;<br />
<span class="t-mark">(niebloid)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-algorithm-ranges-generate.html"><span class="t-lines"><span>ranges::generate</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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<td>&#20445;&#23384;&#20989;&#25968;&#32467;&#26524;&#21040;&#19968;&#20010;&#33539;&#22260;&#20013;<br />
<span class="t-mark">(niebloid)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-algorithm-ranges-transform.html"><span class="t-lines"><span>ranges::transform</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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<td>&#23558;&#19968;&#20010;&#20989;&#25968;&#24212;&#29992;&#20110;&#26576;&#19968;&#33539;&#22260;&#30340;&#21508;&#20010;&#20803;&#32032;<br />
<span class="t-mark">(niebloid)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-algorithm-fill_n.html"><span class="t-lines"><span>fill_n</span></span></a></div>
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<td>&#23558;&#19968;&#20010;&#32473;&#23450;&#20540;&#22797;&#21046;&#36171;&#20540;&#32473;&#19968;&#20010;&#33539;&#22260;&#20869;&#30340; N &#20010;&#20803;&#32032;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
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