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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::ranges::</span>advance</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> <span class="kw4">void</span> advance<span class="br0">(</span> I<span class="sy3">&amp;</span> 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="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, 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> <span class="kw4">void</span> advance<span class="br0">(</span> I<span class="sy3">&amp;</span> i, S bound <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> std<span class="sy4">::</span><span class="me2">iter_difference_t</span><span class="sy1">&lt;</span>I<span class="sy1">&gt;</span> advance<span class="br0">(</span> I<span class="sy3">&amp;</span> 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, 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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<div class="t-li1"><span class="t-li">1)</span> &#33258;&#22686;&#32473;&#23450;&#30340;&#36845;&#20195;&#22120; <code>i</code> <code>n</code> &#27425;&#12290;</div>
<div class="t-li1"><span class="t-li">2)</span> &#33258;&#22686;&#32473;&#23450;&#30340;&#36845;&#20195;&#22120; <code>i</code> &#30452;&#33267; <span class="t-c"><span class="mw-geshi cpp source-cpp">i <span class="sy1">==</span> bound</span></span> &#12290;</div>
<div class="t-li1"><span class="t-li">3)</span> &#33258;&#22686;&#32473;&#23450;&#30340;&#36845;&#20195;&#22120; <code>i</code> <code>n</code> &#27425;&#65292;&#25110;&#30452;&#33267; <span class="t-c"><span class="mw-geshi cpp source-cpp">i <span class="sy1">==</span> bound</span></span> &#65292;&#21462;&#20915;&#20110;&#20309;&#32773;&#20808;&#26469;&#21040;&#12290;</div>
<p>&#33509; <code>n</code> &#65292;&#21017;&#33258;&#20943;&#36845;&#20195;&#22120;&#12290;&#27492;&#24773;&#20917;&#19979;&#65292; <code>I</code> &#24517;&#39035;&#23454;&#29616; <span class="t-lc">std::bidirectional_iterator</span> &#65292;&#32780;&#33509;&#25552;&#20379; <code>bound</code> &#21017; <code>S</code> &#24517;&#39035;&#19982; <code>I</code> &#20026;&#21516;&#19968;&#31867;&#22411;&#65292;&#21542;&#21017;&#34892;&#20026;&#26410;&#23450;&#20041;&#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>
</ul>
<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>
<table class="t-par-begin">
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<td>i</td>
<td>-</td>
<td>&#35201;&#25512;&#36827;&#30340;&#36845;&#20195;&#22120;</td>
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<tr class="t-par">
<td>bound</td>
<td>-</td>
<td>&#25351;&#20195; <code>i</code> &#25152;&#25351;&#21521;&#30340;&#33539;&#22260;&#32467;&#23614;&#30340;&#36845;&#20195;&#22120;</td>
</tr>
<tr class="t-par">
<td>n</td>
<td>-</td>
<td><code>i</code> &#24212;&#33258;&#22686;&#30340;&#27425;&#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">3)</span> <code>n</code> &#19982; <code>i</code> &#25152;&#36941;&#21382;&#30340;&#23454;&#38469;&#36317;&#31163;&#30340;&#24046;&#12290;</div>
<h3><span class="mw-headline" id=".E5.A4.8D.E6.9D.82.E5.BA.A6">&#22797;&#26434;&#24230;</span></h3>
<p>&#32447;&#24615;&#12290;</p>
<p>&#28982;&#32780;&#65292;&#33509; <code>I</code> &#39069;&#22806;&#23454;&#29616; <span class="t-lc">std::random_access_iterator</span> &#65292;&#25110;&#33509; <code>S</code> &#23454;&#29616; <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>I<span class="sy1">&gt;</span></span></span> &#65292;&#25110;&#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">assignable_from</span><span class="sy1">&lt;</span>I<span class="sy3">&amp;</span>, S<span class="sy1">&gt;</span></span></span> &#65292;&#21017;&#22797;&#26434;&#24230;&#20026;&#24120;&#25968;&#12290;</p>
<h3><span class="mw-headline" id=".E6.B3.A8.E8.A7.A3">&#27880;&#35299;</span></h3>
<p>&#33509;&#25351;&#23450;&#30340;&#33258;&#22686;&#25110;&#33258;&#20943;&#24207;&#21015;&#20250;&#35201;&#27714;&#33258;&#22686;&#19981;&#21487;&#33258;&#22686;&#30340;&#36845;&#20195;&#22120;&#65288;&#20363;&#22914;&#23614;&#21518;&#36845;&#20195;&#22120;&#65289;&#25110;&#33258;&#20943;&#19981;&#21487;&#33258;&#20943;&#30340;&#36845;&#20195;&#22120;&#65288;&#20363;&#22914;&#39318;&#36845;&#20195;&#22120;&#25110;&#23396;&#31435;&#36845;&#20195;&#22120;&#65289;&#21017;&#34892;&#20026;&#26410;&#23450;&#20041;&#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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<div class="cpp source-cpp">
<pre class="de1"><span class="kw1">struct</span> advance_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> <span class="kw4">void</span> operator<span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>I<span class="sy3">&amp;</span> 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>
<span class="kw1">if</span> <span class="kw4">constexpr</span> <span class="br0">(</span>std<span class="sy4">::</span><span class="me2">random_access_iterator</span><span class="sy1">&lt;</span>I<span class="sy1">&gt;</span><span class="br0">)</span> <span class="br0">{</span>
i <span class="sy2">+</span><span class="sy1">=</span> n<span class="sy4">;</span>
<span class="br0">}</span>
<span class="kw1">else</span> <span class="br0">{</span>
<span class="kw1">while</span> <span class="br0">(</span>n <span class="sy1">&gt;</span> <span class="nu0">0</span><span class="br0">)</span> <span class="br0">{</span>
<span class="sy2">--</span>n<span class="sy4">;</span>
<span class="sy2">++</span>i<span class="sy4">;</span>
<span class="br0">}</span>
<span class="kw1">if</span> <span class="kw4">constexpr</span> <span class="br0">(</span>std<span class="sy4">::</span><span class="me2">bidirectional_iterator</span><span class="sy1">&lt;</span>I<span class="sy1">&gt;</span><span class="br0">)</span> <span class="br0">{</span>
<span class="kw1">while</span> <span class="br0">(</span>n <span class="sy1">&lt;</span> <span class="nu0">0</span><span class="br0">)</span> <span class="br0">{</span>
<span class="sy2">++</span>n<span class="sy4">;</span>
<span class="sy2">--</span>i<span class="sy4">;</span>
<span class="br0">}</span>
<span class="br0">}</span>
<span class="br0">}</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> <span class="kw4">void</span> operator<span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>I<span class="sy3">&amp;</span> i, S bound<span class="br0">)</span> <span class="kw4">const</span>
<span class="br0">{</span>
<span class="kw1">if</span> <span class="kw4">constexpr</span> <span class="br0">(</span>std<span class="sy4">::</span><span class="me2">assignable_from</span><span class="sy1">&lt;</span>I<span class="sy3">&amp;</span>, S<span class="sy1">&gt;</span><span class="br0">)</span> <span class="br0">{</span>
i <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>bound<span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span>
<span class="kw1">else</span> <span class="kw1">if</span> <span class="kw4">constexpr</span> <span class="br0">(</span>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 class="br0">)</span> <span class="br0">{</span>
ranges<span class="sy4">::</span><span class="me2">advance</span><span class="br0">(</span>i, bound <span class="sy2">-</span> i<span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span>
<span class="kw1">else</span> <span class="br0">{</span>
<span class="kw1">while</span> <span class="br0">(</span>i <span class="sy3">!</span><span class="sy1">=</span> bound<span class="br0">)</span> <span class="br0">{</span>
<span class="sy2">++</span>i<span class="sy4">;</span>
<span class="br0">}</span>
<span class="br0">}</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> std<span class="sy4">::</span><span class="me2">iter_difference_t</span><span class="sy1">&lt;</span>I<span class="sy1">&gt;</span>
operator<span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>I<span class="sy3">&amp;</span> 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, S bound<span class="br0">)</span> <span class="kw4">const</span>
<span class="br0">{</span>
<span class="kw1">if</span> <span class="kw4">constexpr</span> <span class="br0">(</span>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 class="br0">)</span> <span class="br0">{</span>
<span class="co1">// std::abs &#38750; constexpr</span>
<span class="kw4">auto</span> abs <span class="sy1">=</span> <span class="br0">[</span><span class="br0">]</span><span class="br0">(</span><span class="kw4">const</span> std<span class="sy4">::</span><span class="me2">iter_difference_t</span><span class="sy1">&lt;</span>I<span class="sy1">&gt;</span> x<span class="br0">)</span> <span class="br0">{</span> <span class="kw1">return</span> x <span class="sy1">&lt;</span> <span class="nu0">0</span> <span class="sy4">?</span> <span class="sy2">-</span>x <span class="sy4">:</span> x<span class="sy4">;</span> <span class="br0">}</span><span class="sy4">;</span>
<span class="kw4">const</span> <span class="kw4">auto</span> dist <span class="sy1">=</span> abs<span class="br0">(</span>n<span class="br0">)</span> <span class="sy2">-</span> abs<span class="br0">(</span>bound <span class="sy2">-</span> i<span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">if</span> <span class="br0">(</span>dist <span class="sy1">&lt;</span> <span class="nu0">0</span><span class="br0">)</span> <span class="br0">{</span>
ranges<span class="sy4">::</span><span class="me2">advance</span><span class="br0">(</span>i, bound<span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">return</span> <span class="sy2">-</span>dist<span class="sy4">;</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> <span class="nu0">0</span><span class="sy4">;</span>
<span class="br0">}</span>
<span class="kw1">else</span> <span class="br0">{</span>
<span class="kw1">while</span> <span class="br0">(</span>n <span class="sy1">&gt;</span> <span class="nu0">0</span> <span class="sy3">&amp;&amp;</span> i <span class="sy3">!</span><span class="sy1">=</span> bound<span class="br0">)</span> <span class="br0">{</span>
<span class="sy2">--</span>n<span class="sy4">;</span>
<span class="sy2">++</span>i<span class="sy4">;</span>
<span class="br0">}</span>
<span class="kw1">if</span> <span class="kw4">constexpr</span> <span class="br0">(</span>std<span class="sy4">::</span><span class="me2">bidirectional_iterator</span><span class="sy1">&lt;</span>I<span class="sy1">&gt;</span><span class="br0">)</span> <span class="br0">{</span>
<span class="kw1">while</span> <span class="br0">(</span>n <span class="sy1">&lt;</span> <span class="nu0">0</span> <span class="sy3">&amp;&amp;</span> i <span class="sy3">!</span><span class="sy1">=</span> bound<span class="br0">)</span> <span class="br0">{</span>
<span class="sy2">++</span>n<span class="sy4">;</span>
<span class="sy2">--</span>i<span class="sy4">;</span>
<span class="br0">}</span>
<span class="br0">}</span>
<span class="kw1">return</span> n<span class="sy4">;</span>
<span class="br0">}</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> advance <span class="sy1">=</span> advance_fn<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span></pre></div>
</div>
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</tr>
</table>
<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="kw4">auto</span> vi <span class="sy1">=</span> v.<span class="me1">begin</span><span class="br0">(</span><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">advance</span><span class="br0">(</span>vi, <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="st0">&quot;value: &quot;</span> <span class="sy1">&lt;&lt;</span> <span class="sy2">*</span>vi <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>
std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">advance</span><span class="br0">(</span>vi, 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="st0">&quot;vi == v.end(): &quot;</span> <span class="sy1">&lt;&lt;</span> <span class="br0">(</span>vi <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>
std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">advance</span><span class="br0">(</span>vi, <span class="sy2">-</span><span class="nu0">3</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;value: &quot;</span> <span class="sy1">&lt;&lt;</span> <span class="sy2">*</span>vi <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> <span class="st0">&quot;diff: &quot;</span> <span class="sy1">&lt;&lt;</span> std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">advance</span><span class="br0">(</span>vi, <span class="nu0">2</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">&quot;, &quot;</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;value: &quot;</span> <span class="sy1">&lt;&lt;</span> <span class="sy2">*</span>vi <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> <span class="st0">&quot;diff: &quot;</span> <span class="sy1">&lt;&lt;</span> std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">advance</span><span class="br0">(</span>vi, <span class="nu0">4</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">&quot;, &quot;</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;vi == v.end(): &quot;</span> <span class="sy1">&lt;&lt;</span> <span class="br0">(</span>vi <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">value: 4
vi == v.end(): true
value: 3
diff: 0, value: 4
diff: 3, vi == v.end(): true</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-iterator-ranges-next.html"><span class="t-lines"><span>ranges::next</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;&#22686;&#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-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-distance.html"><span class="t-lines"><span>ranges::distance</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>&#36820;&#22238;&#36845;&#20195;&#22120;&#19982;&#21736;&#20301;&#38388;&#30340;&#36317;&#31163;&#65292;&#25110;&#33539;&#22260;&#36215;&#22987;&#19982;&#32467;&#23614;&#38388;&#30340;&#36317;&#31163;<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-advance.html"><span class="t-lines"><span>advance</span></span></a></div>
</div>
</td>
<td>&#20196;&#36845;&#20195;&#22120;&#21069;&#36827;&#32473;&#23450;&#30340;&#36317;&#31163;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
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<div class="visualClear"></div>
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