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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::ranges::</span>next</h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-iterator.html">iterator</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code><a href="cpp-header-iterator.html">&lt;iterator&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_or_output_iterator</span> I <span class="sy1">&gt;</span><br />
<span class="kw4">constexpr</span> I next<span class="br0">(</span> I x <span class="br0">)</span><span class="sy4">;</span></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><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_or_output_iterator</span> I <span class="sy1">&gt;</span><br />
<span class="kw4">constexpr</span> I next<span class="br0">(</span> I x, std<span class="sy4">::</span><span class="me2">iter_difference_t</span><span class="sy1">&lt;</span>I<span class="sy1">&gt;</span> n <span class="br0">)</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><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_or_output_iterator</span> I, std<span class="sy4">::</span><span class="me2">sentinel_for</span><span class="sy1">&lt;</span>I<span class="sy1">&gt;</span> S <span class="sy1">&gt;</span><br />
<span class="kw4">constexpr</span> I next<span class="br0">(</span> I x, std<span class="sy4">::</span><span class="me2">iter_difference_t</span><span class="sy1">&lt;</span>I<span class="sy1">&gt;</span> n, S bound <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(3)</td>
<td><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></td>
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<p>&#36820;&#22238;&#36845;&#20195;&#22120; <code>i</code> &#30340;&#31532; <i>n</i> &#20010;&#21518;&#32487;&#12290;</p>
<p>&#27492;&#39029;&#38754;&#19978;&#25551;&#36848;&#30340;&#20223;&#20989;&#25968;&#23454;&#20307;&#26159; <i>niebloid</i> &#65292;&#21363;&#65306;</p>
<ul>
<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>i</td>
<td>-</td>
<td>&#36845;&#20195;&#22120;</td>
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<td>n</td>
<td>-</td>
<td>&#35201;&#33258;&#22686;&#30340;&#27425;&#25968;</td>
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<td>bound</td>
<td>-</td>
<td>&#25351;&#20195; <code>i</code> &#25152;&#25351;&#21521;&#30340;&#33539;&#22260;&#32467;&#23614;&#30340;&#21736;&#20301;</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>
<div class="t-li1"><span class="t-li">1)</span> &#36845;&#20195;&#22120; <code>i</code> &#30340;&#21518;&#32487;</div>
<div class="t-li1"><span class="t-li">2)</span> &#36845;&#20195;&#22120; <code>i</code> &#30340;&#31532; <i>n</i> &#20010;&#21518;&#32487;</div>
<div class="t-li1"><span class="t-li">3)</span> &#36845;&#20195;&#22120; <code>i</code> &#30340;&#31532; <i>n</i> &#20010;&#21518;&#32487;&#65292;&#25110;&#39318;&#20010;&#31561;&#20110; <code>bound</code> &#30340;&#36845;&#20195;&#22120;&#65292;&#21462;&#20915;&#20110;&#20309;&#32773;&#20808;&#26469;&#21040;&#12290;</div>
<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> &#24120;&#25968;</div>
<div class="t-li1"><span class="t-li">2)</span> &#33509; <code>I</code> &#23454;&#29616; <span class="t-lc">std::random_access_iterator</span> &#21017;&#20026;&#24120;&#25968;&#65307;&#21542;&#21017;&#20026;&#32447;&#24615;&#12290;</div>
<div class="t-li1"><span class="t-li">3)</span> &#33509; <code>I</code> &#19982; <code>S</code> &#23454;&#29616; <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">random_access_iterator</span><span class="sy1">&lt;</span>I<span class="sy1">&gt;</span></span></span> &#21644; <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">sized_sentinel_for</span><span class="sy1">&lt;</span>S, I<span class="sy1">&gt;</span></span></span> &#21017;&#20026;&#24120;&#25968;&#65307;&#21542;&#21017;&#20026;&#32447;&#24615;&#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>
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<pre class="de1"><span class="kw1">struct</span> next_fn <span class="br0">{</span>
<span class="kw1">template</span><span class="sy1">&lt;</span>std<span class="sy4">::</span><span class="me2">input_or_output_iterator</span> I<span class="sy1">&gt;</span>
<span class="kw4">constexpr</span> I operator<span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>I i<span class="br0">)</span> <span class="kw4">const</span>
<span class="br0">{</span>
<span class="kw1">return</span> <span class="sy2">++</span>i<span class="sy4">;</span>
<span class="br0">}</span>
<span class="kw1">template</span><span class="sy1">&lt;</span> std<span class="sy4">::</span><span class="me2">input_or_output_iterator</span> I <span class="sy1">&gt;</span>
<span class="kw4">constexpr</span> I operator<span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>I i, std<span class="sy4">::</span><span class="me2">iter_difference_t</span><span class="sy1">&lt;</span>I<span class="sy1">&gt;</span> n<span class="br0">)</span> <span class="kw4">const</span>
<span class="br0">{</span>
ranges<span class="sy4">::</span><span class="me2">advance</span><span class="br0">(</span>i, n<span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">return</span> i<span class="sy4">;</span>
<span class="br0">}</span>
<span class="kw1">template</span><span class="sy1">&lt;</span>std<span class="sy4">::</span><span class="me2">input_or_output_iterator</span> I, std<span class="sy4">::</span><span class="me2">sentinel_for</span><span class="sy1">&lt;</span>I<span class="sy1">&gt;</span> S<span class="sy1">&gt;</span>
<span class="kw4">constexpr</span> I operator<span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>I i, std<span class="sy4">::</span><span class="me2">iter_difference_t</span><span class="sy1">&lt;</span>I<span class="sy1">&gt;</span> n, I bound<span class="br0">)</span> <span class="kw4">const</span>
<span class="br0">{</span>
ranges<span class="sy4">::</span><span class="me2">advance</span><span class="br0">(</span>i, n, bound<span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">return</span> i<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> <span class="kw4">auto</span> next <span class="sy1">=</span> next_fn<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span></pre></div>
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<h3><span class="mw-headline" id=".E6.B3.A8.E8.A7.A3">&#27880;&#35299;</span></h3>
<p>&#23613;&#31649;&#34920;&#36798;&#24335; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">++</span>x.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span></span></span> &#32463;&#24120;&#33021;&#32534;&#35793;&#65292;&#20294;&#19981;&#20445;&#35777;&#22914;&#27492;&#65306; <span class="t-c"><span class="mw-geshi cpp source-cpp">x.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span></span></span> &#26159;&#21491;&#20540;&#34920;&#36798;&#24335;&#65292;&#32780;&#27809;&#26377;&#35201;&#27714;&#25351;&#23450;&#21491;&#20540;&#30340;&#33258;&#22686;&#20445;&#35777;&#33021;&#24037;&#20316;&#12290;&#23588;&#20854;&#26159;&#36845;&#20195;&#22120;&#23454;&#29616;&#20026;&#25351;&#38024;&#25110;&#20854; <code>operator++</code> &#20026;&#24038;&#20540;&#24341;&#29992;&#38480;&#23450;&#26102;&#65292; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">++</span>x.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span></span></span> &#19981;&#33021;&#32534;&#35793;&#65292;&#32780; <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>x.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span></span></span> &#33021;&#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;iomanip&gt;</span>
<span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;iterator&gt;</span>
<span class="co2">#include &lt;vector&gt;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</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> v<span class="br0">{</span> <span class="nu0">3</span>, <span class="nu0">1</span>, <span class="nu0">4</span> <span class="br0">}</span><span class="sy4">;</span>
<span class="br0">{</span>
<span class="kw4">auto</span> n <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">next</span><span class="br0">(</span>v.<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="sy2">*</span>n <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="br0">{</span>
<span class="kw4">auto</span> n <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">next</span><span class="br0">(</span>v.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, <span class="nu0">2</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="sy2">*</span>n <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="br0">{</span>
<span class="kw4">auto</span> n <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">next</span><span class="br0">(</span>v.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, <span class="nu0">42</span>, v.<span class="me1">end</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> <a href="cpp-io-manip-boolalpha.html"><span class="kw1764">std::<span class="me2">boolalpha</span></span></a><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="br0">(</span>n <span class="sy1">==</span> v.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</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>
<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-boolalpha.html"><span class="kw1765">std::<span class="me2">noboolalpha</span></span></a><span class="sy4">;</span>
<span class="br0">}</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">1
4
true</pre></div>
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</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-iterator-ranges-prev.html"><span class="t-lines"><span>ranges::prev</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>&#33258;&#20943;&#36845;&#20195;&#22120;&#32473;&#23450;&#30340;&#36317;&#31163;&#25110;&#21040;&#36793;&#30028;<br />
<span class="t-mark">(niebloid)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-iterator-ranges-advance.html"><span class="t-lines"><span>ranges::advance</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>&#20196;&#36845;&#20195;&#22120;&#21069;&#36827;&#32473;&#23450;&#30340;&#36317;&#31163;&#25110;&#21040;&#32473;&#23450;&#30340;&#36793;&#30028;<br />
<span class="t-mark">(niebloid)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-iterator-next.html"><span class="t-lines"><span>next</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>&#20196;&#36845;&#20195;&#22120;&#33258;&#22686;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
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