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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::ranges::</span>includes</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> I1, std<span class="sy4">::</span><span class="me2">sentinel_for</span><span class="sy1">&lt;</span>I1<span class="sy1">&gt;</span> S1,<br /></span>
<p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; std<span class="sy4">::</span><span class="me2">input_iterator</span> I2, std<span class="sy4">::</span><span class="me2">sentinel_for</span><span class="sy1">&lt;</span>I2<span class="sy1">&gt;</span> S2,<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw1">class</span> Proj1 <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">identity</span>, <span class="kw1">class</span> Proj2 <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">identity</span>,<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; std<span class="sy4">::</span><span class="me2">indirect_strict_weak_order</span><span class="sy1">&lt;</span><br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; std<span class="sy4">::</span><span class="me2">projected</span><span class="sy1">&lt;</span>I1, Proj1<span class="sy1">&gt;</span>,<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; std<span class="sy4">::</span><span class="me2">projected</span><span class="sy1">&lt;</span>I2, Proj2<span class="sy1">&gt;&gt;</span> Comp <span class="sy1">=</span> ranges<span class="sy4">::</span><span class="me2">less</span> <span class="sy1">&gt;</span><br />
<span class="kw4">constexpr</span> <span class="kw4">bool</span> includes<span class="br0">(</span> I1 first1, S1 last1, I2 first2, S2 last2,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Comp comp <span class="sy1">=</span> <span class="br0">{</span><span class="br0">}</span>, Proj1 proj1 <span class="sy1">=</span> <span class="br0">{</span><span class="br0">}</span>, Proj2 proj2 <span class="sy1">=</span> <span class="br0">{</span><span class="br0">}</span> <span class="br0">)</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> ranges<span class="sy4">::</span><span class="me2">input_range</span> R1, ranges<span class="sy4">::</span><span class="me2">input_range</span> R2,<br /></span>
<p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw1">class</span> Proj1 <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">identity</span>, <span class="kw1">class</span> Proj2 <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">identity</span>,<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; std<span class="sy4">::</span><span class="me2">indirect_strict_weak_order</span><span class="sy1">&lt;</span><br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; std<span class="sy4">::</span><span class="me2">projected</span><span class="sy1">&lt;</span>ranges<span class="sy4">::</span><span class="me2">iterator_t</span><span class="sy1">&lt;</span>R1<span class="sy1">&gt;</span>, Proj1<span class="sy1">&gt;</span>,<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; std<span class="sy4">::</span><span class="me2">projected</span><span class="sy1">&lt;</span>ranges<span class="sy4">::</span><span class="me2">iterator_t</span><span class="sy1">&lt;</span>R2<span class="sy1">&gt;</span>, Proj2<span class="sy1">&gt;&gt;</span> Comp <span class="sy1">=</span> ranges<span class="sy4">::</span><span class="me2">less</span> <span class="sy1">&gt;</span><br />
<span class="kw4">constexpr</span> <span class="kw4">bool</span> includes<span class="br0">(</span> R1<span class="sy3">&amp;&amp;</span> r1, R2<span class="sy3">&amp;&amp;</span> r2, Comp comp <span class="sy1">=</span> <span class="br0">{</span><span class="br0">}</span>,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Proj1 proj1 <span class="sy1">=</span> <span class="br0">{</span><span class="br0">}</span>, Proj2 proj2 <span class="sy1">=</span> <span class="br0">{</span><span class="br0">}</span> <span class="br0">)</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> &#33509;&#24050;&#25490;&#24207;&#33539;&#22260; <code>[first2, last2)</code> &#30340;&#25237;&#24433;&#26159;&#24050;&#25490;&#24207;&#33539;&#22260; <code>[first1, last1)</code> &#30340;&#25237;&#24433;&#30340;<a href="https://en.wikipedia.org/wiki/subsequence" class="extiw" title="enwiki:subsequence">&#23376;&#24207;&#21015;</a>&#21017;&#36820;&#22238; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> &#12290;</div>
<div class="t-li1"><span class="t-li">2)</span> &#21516; <span class="t-v">(1)</span> &#65292;&#20294;&#20197; <code>r1</code> &#19982; <code>r2</code> &#20026;&#28304;&#33539;&#22260;&#65292;&#22914;&#21516;&#20998;&#21035;&#20197; <span class="t-c"><span class="mw-geshi cpp source-cpp">ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>r1<span class="br0">)</span></span></span> &#19982; <span class="t-c"><span class="mw-geshi cpp source-cpp">ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>r2<span class="br0">)</span></span></span> &#20026; <code>first1</code> &#19982; <code>first2</code> &#65292;&#24182;&#20998;&#21035;&#20197; <span class="t-c"><span class="mw-geshi cpp source-cpp">ranges<span class="sy4">::</span><span class="me2">end</span><span class="br0">(</span>r1<span class="br0">)</span></span></span> &#19982; <span class="t-c"><span class="mw-geshi cpp source-cpp">ranges<span class="sy4">::</span><span class="me2">end</span><span class="br0">(</span>r2<span class="br0">)</span></span></span> &#20026; <code>last1</code> &#19982; <code>last2</code> &#12290;</div>
<p>&#20004;&#20010;&#33539;&#22260;&#37117;&#24517;&#39035;&#25353;&#29031;&#32473;&#23450;&#30340;&#27604;&#36739;&#20989;&#25968; <code>comp</code> &#25490;&#24207;&#12290;&#23376;&#24207;&#21015;&#19981;&#38656;&#35201;&#36830;&#32493;&#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>
<table class="t-par-begin">
<tr class="t-par">
<td>first1, last1</td>
<td>-</td>
<td>&#24453;&#26816;&#39564;&#30340;&#24050;&#25490;&#24207;&#30340;&#20803;&#32032;&#33539;&#22260;</td>
</tr>
<tr class="t-par">
<td>r1</td>
<td>-</td>
<td>&#24453;&#26816;&#39564;&#30340;&#24050;&#25490;&#24207;&#30340;&#20803;&#32032;&#33539;&#22260;</td>
</tr>
<tr class="t-par">
<td>first2, last2</td>
<td>-</td>
<td>&#24453;&#25628;&#32034;&#30340;&#24050;&#25490;&#24207;&#30340;&#20803;&#32032;&#33539;&#22260;</td>
</tr>
<tr class="t-par">
<td>r2</td>
<td>-</td>
<td>&#24453;&#25628;&#32034;&#30340;&#24050;&#25490;&#24207;&#30340;&#20803;&#32032;&#33539;&#22260;</td>
</tr>
<tr class="t-par">
<td>comp</td>
<td>-</td>
<td>&#24212;&#29992;&#21040;&#25237;&#24433;&#21518;&#20803;&#32032;&#30340;&#35859;&#35789;</td>
</tr>
<tr class="t-par">
<td>proj1</td>
<td>-</td>
<td>&#24212;&#29992;&#21040;&#31532;&#19968;&#33539;&#22260;&#20013;&#20803;&#32032;&#30340;&#25237;&#24433;</td>
</tr>
<tr class="t-par">
<td>proj2</td>
<td>-</td>
<td>&#24212;&#29992;&#21040;&#31532;&#20108;&#33539;&#22260;&#20013;&#20803;&#32032;&#30340;&#25237;&#24433;</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>&#33509; <code>[first2, last2)</code> &#26159; <code>[first1, last1)</code> &#30340;&#23376;&#24207;&#21015;&#21017;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> &#65307;&#21542;&#21017;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span> &#12290;</p>
<h3><span class="mw-headline" id=".E5.A4.8D.E6.9D.82.E5.BA.A6">&#22797;&#26434;&#24230;</span></h3>
<p>&#33267;&#22810;&#27604;&#36739; <span class="mjax" style="display:none">\(\scriptsize 2 \cdot (N_1+N_2-1)\)</span><span class="mjax-fallback texhtml" style="white-space: nowrap;">2&middot;(N<sub>1</sub>+N<sub>2</sub>-1)</span> &#27425;&#65292;&#20854;&#20013; <span class="mjax" style="display:none">\(\scriptsize N_1\)</span><span class="mjax-fallback texhtml" style="white-space: nowrap;">N<sub>1</sub></span> &#20026; <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>r1<span class="br0">)</span></span></span> &#32780; <span class="mjax" style="display:none">\(\scriptsize N_2\)</span><span class="mjax-fallback texhtml" style="white-space: nowrap;">N<sub>2</sub></span> &#20026; <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>r2<span class="br0">)</span></span></span> &#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> includes_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> I1, std<span class="sy4">::</span><span class="me2">sentinel_for</span><span class="sy1">&lt;</span>I1<span class="sy1">&gt;</span> S1,
std<span class="sy4">::</span><span class="me2">input_iterator</span> I2, std<span class="sy4">::</span><span class="me2">sentinel_for</span><span class="sy1">&lt;</span>I2<span class="sy1">&gt;</span> S2,
<span class="kw1">class</span> Proj1 <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">identity</span>, <span class="kw1">class</span> Proj2 <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">identity</span>,
std<span class="sy4">::</span><span class="me2">indirect_strict_weak_order</span><span class="sy1">&lt;</span>
std<span class="sy4">::</span><span class="me2">projected</span><span class="sy1">&lt;</span>I1, Proj1<span class="sy1">&gt;</span>,
std<span class="sy4">::</span><span class="me2">projected</span><span class="sy1">&lt;</span>I2, Proj2<span class="sy1">&gt;&gt;</span> Comp <span class="sy1">=</span> ranges<span class="sy4">::</span><span class="me2">less</span><span class="sy1">&gt;</span>
<span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>I1 first1, S1 last1, I2 first2, S2 last2,
Comp comp <span class="sy1">=</span> <span class="br0">{</span><span class="br0">}</span>, Proj1 proj1 <span class="sy1">=</span> <span class="br0">{</span><span class="br0">}</span>, Proj2 proj2 <span class="sy1">=</span> <span class="br0">{</span><span class="br0">}</span><span class="br0">)</span> <span class="kw4">const</span>
<span class="br0">{</span>
<span class="kw1">for</span> <span class="br0">(</span><span class="sy4">;</span> first2 <span class="sy3">!</span><span class="sy1">=</span> last2<span class="sy4">;</span> <span class="sy2">++</span>first1<span class="br0">)</span>
<span class="br0">{</span>
<span class="kw1">if</span> <span class="br0">(</span>first1 <span class="sy1">==</span> last1 <span class="sy3">&amp;&amp;</span> comp<span class="br0">(</span><span class="sy2">*</span>first2, <span class="sy2">*</span>first1<span class="br0">)</span><span class="br0">)</span>
<span class="kw1">return</span> <span class="kw2">false</span><span class="sy4">;</span>
<span class="kw1">if</span> <span class="br0">(</span><span class="sy3">!</span>comp<span class="br0">(</span><span class="sy2">*</span>first1, <span class="sy2">*</span>first2<span class="br0">)</span><span class="br0">)</span>
<span class="sy2">++</span>first2<span class="sy4">;</span>
<span class="br0">}</span>
<span class="kw1">return</span> <span class="kw2">true</span><span class="sy4">;</span>
<span class="br0">}</span>
<span class="kw1">template</span><span class="sy1">&lt;</span>ranges<span class="sy4">::</span><span class="me2">input_range</span> R1, ranges<span class="sy4">::</span><span class="me2">input_range</span> R2,
<span class="kw1">class</span> Proj1 <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">identity</span>, <span class="kw1">class</span> Proj2 <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">identity</span>,
std<span class="sy4">::</span><span class="me2">indirect_strict_weak_order</span><span class="sy1">&lt;</span>
std<span class="sy4">::</span><span class="me2">projected</span><span class="sy1">&lt;</span>ranges<span class="sy4">::</span><span class="me2">iterator_t</span><span class="sy1">&lt;</span>R1<span class="sy1">&gt;</span>, Proj1<span class="sy1">&gt;</span>,
std<span class="sy4">::</span><span class="me2">projected</span><span class="sy1">&lt;</span>ranges<span class="sy4">::</span><span class="me2">iterator_t</span><span class="sy1">&lt;</span>R2<span class="sy1">&gt;</span>, Proj2<span class="sy1">&gt;&gt;</span> Comp <span class="sy1">=</span> ranges<span class="sy4">::</span><span class="me2">less</span><span class="sy1">&gt;</span>
<span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>R1<span class="sy3">&amp;&amp;</span> r1, R2<span class="sy3">&amp;&amp;</span> r2, Comp comp <span class="sy1">=</span> <span class="br0">{</span><span class="br0">}</span>,
Proj1 proj1 <span class="sy1">=</span> <span class="br0">{</span><span class="br0">}</span>, Proj2 proj2 <span class="sy1">=</span> <span class="br0">{</span><span class="br0">}</span><span class="br0">)</span> <span class="kw4">const</span>
<span class="br0">{</span>
<span class="kw1">return</span> <span class="br0">(</span><span class="sy2">*</span>this<span class="br0">)</span><span class="br0">(</span>ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>r1<span class="br0">)</span>, ranges<span class="sy4">::</span><span class="me2">end</span><span class="br0">(</span>r1<span class="br0">)</span>,
ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>r2<span class="br0">)</span>, ranges<span class="sy4">::</span><span class="me2">end</span><span class="br0">(</span>r2<span class="br0">)</span>,
<a href="cpp-utility-functional-ref.html"><span class="kw1069">std::<span class="me2">ref</span></span></a><span class="br0">(</span>comp<span class="br0">)</span>, <a href="cpp-utility-functional-ref.html"><span class="kw1069">std::<span class="me2">ref</span></span></a><span class="br0">(</span>proj1<span class="br0">)</span>, <a href="cpp-utility-functional-ref.html"><span class="kw1069">std::<span class="me2">ref</span></span></a><span class="br0">(</span>proj2<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> <span class="kw4">auto</span> includes <span class="sy1">=</span> includes_fn<span class="br0">{</span><span class="br0">}</span><span class="sy4">;</span></pre></div>
</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;iostream&gt;</span>
<span class="co2">#include &lt;algorithm&gt;</span>
<span class="co2">#include &lt;cctype&gt;</span>
<span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> Os, <span class="kw1">class</span> R<span class="sy1">&gt;</span> Os<span class="sy3">&amp;</span> operator<span class="sy1">&lt;&lt;</span><span class="br0">(</span>Os<span class="sy3">&amp;</span> os, <span class="kw4">const</span> R<span class="sy3">&amp;</span> r<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> e <span class="sy4">:</span> r<span class="br0">)</span> os <span class="sy1">&lt;&lt;</span> e <span class="sy1">&lt;&lt;</span> <span class="st0">&#39; &#39;</span><span class="sy4">;</span>
<span class="kw1">return</span> os <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\t</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">const</span> <span class="kw4">auto</span>
v1 <span class="sy1">=</span> <span class="br0">{</span><span class="st0">&#39;a&#39;</span>, <span class="st0">&#39;b&#39;</span>, <span class="st0">&#39;c&#39;</span>, <span class="st0">&#39;f&#39;</span>, <span class="st0">&#39;h&#39;</span>, <span class="st0">&#39;x&#39;</span><span class="br0">}</span>,
v2 <span class="sy1">=</span> <span class="br0">{</span><span class="st0">&#39;a&#39;</span>, <span class="st0">&#39;b&#39;</span>, <span class="st0">&#39;c&#39;</span><span class="br0">}</span>,
v3 <span class="sy1">=</span> <span class="br0">{</span><span class="st0">&#39;a&#39;</span>, <span class="st0">&#39;c&#39;</span><span class="br0">}</span>,
v4 <span class="sy1">=</span> <span class="br0">{</span><span class="st0">&#39;a&#39;</span>, <span class="st0">&#39;a&#39;</span>, <span class="st0">&#39;b&#39;</span><span class="br0">}</span>,
v5 <span class="sy1">=</span> <span class="br0">{</span><span class="st0">&#39;g&#39;</span><span class="br0">}</span>,
v6 <span class="sy1">=</span> <span class="br0">{</span><span class="st0">&#39;a&#39;</span>, <span class="st0">&#39;c&#39;</span>, <span class="st0">&#39;g&#39;</span><span class="br0">}</span>,
v7 <span class="sy1">=</span> <span class="br0">{</span><span class="st0">&#39;A&#39;</span>, <span class="st0">&#39;B&#39;</span>, <span class="st0">&#39;C&#39;</span><span class="br0">}</span><span class="sy4">;</span>
<span class="kw4">auto</span> no_case <span class="sy1">=</span> <span class="br0">[</span><span class="br0">]</span><span class="br0">(</span><span class="kw4">char</span> a, <span class="kw4">char</span> b<span class="br0">)</span> <span class="br0">{</span> <span class="kw1">return</span> std<span class="sy4">::</span><span class="me2">tolower</span><span class="br0">(</span>a<span class="br0">)</span> <span class="sy1">&lt;</span> std<span class="sy4">::</span><span class="me2">tolower</span><span class="br0">(</span>b<span class="br0">)</span><span class="sy4">;</span> <span class="br0">}</span><span class="sy4">;</span>
<span class="kw1">namespace</span> ranges <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">ranges</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> v1 <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;<span class="es1">\n</span>includes:<span class="es1">\n</span>&quot;</span> <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="sy1">&lt;&lt;</span> v2 <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;: &quot;</span> <span class="sy1">&lt;&lt;</span> ranges<span class="sy4">::</span><span class="me2">includes</span><span class="br0">(</span>v1.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, v1.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span>, v2.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, v2.<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="sy1">&lt;&lt;</span> v3 <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;: &quot;</span> <span class="sy1">&lt;&lt;</span> ranges<span class="sy4">::</span><span class="me2">includes</span><span class="br0">(</span>v1, v3<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> v4 <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;: &quot;</span> <span class="sy1">&lt;&lt;</span> ranges<span class="sy4">::</span><span class="me2">includes</span><span class="br0">(</span>v1, v4<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> v5 <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;: &quot;</span> <span class="sy1">&lt;&lt;</span> ranges<span class="sy4">::</span><span class="me2">includes</span><span class="br0">(</span>v1, v5<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> v6 <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;: &quot;</span> <span class="sy1">&lt;&lt;</span> ranges<span class="sy4">::</span><span class="me2">includes</span><span class="br0">(</span>v1, v6<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> v7 <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;: &quot;</span> <span class="sy1">&lt;&lt;</span> ranges<span class="sy4">::</span><span class="me2">includes</span><span class="br0">(</span>v1, v7, no_case<span class="br0">)</span>
<span class="sy1">&lt;&lt;</span> <span class="st0">&quot; (case-insensitive)<span class="es1">\n</span>&quot;</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">a b c f h x
includes:
a b c : true
a c : true
a a b : false
g : false
a c g : false
A B C : true (case-insensitive)</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-set_difference.html"><span class="t-lines"><span>ranges::set_difference</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>&#35745;&#31639;&#20004;&#20010;&#38598;&#21512;&#30340;&#24046;&#38598;<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-search.html"><span class="t-lines"><span>ranges::search</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>&#25628;&#32034;&#19968;&#20010;&#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-includes.html"><span class="t-lines"><span>includes</span></span></a></div>
</div>
</td>
<td>&#33509;&#19968;&#20010;&#24207;&#21015;&#26159;&#21478;&#19968;&#20010;&#30340;&#23376;&#21015;&#21017;&#36820;&#22238; true<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
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