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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::ranges::</span>starts_with</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> Pred <span class="sy1">=</span> ranges<span class="sy4">::</span><span class="me2">equal_to</span>,<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><span class="sy1">&gt;</span><br />
&nbsp; requires std<span class="sy4">::</span><span class="me2">indirectly_comparable</span><span class="sy1">&lt;</span>I1, I2, Pred, Proj1, Proj2<span class="sy1">&gt;</span><br />
<span class="kw4">constexpr</span> <span class="kw4">bool</span> starts_with<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; &nbsp;Pred pred <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="sy4">;</span></div>
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<td>(1)</td>
<td><span class="t-mark-rev t-since-cxx23">(C++23 &#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> Pred <span class="sy1">=</span> ranges<span class="sy4">::</span><span class="me2">equal_to</span>,<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><span class="sy1">&gt;</span><br />
&nbsp; requires std<span class="sy4">::</span><span class="me2">indirectly_comparable</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>,<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ranges<span class="sy4">::</span><span class="me2">iterator_t</span><span class="sy1">&lt;</span>R2<span class="sy1">&gt;</span>,<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Pred, Proj1, Proj2<span class="sy1">&gt;</span><br />
<span class="kw4">constexpr</span> <span class="kw4">bool</span> starts_with<span class="br0">(</span>R1<span class="sy3">&amp;&amp;</span> r1, R2<span class="sy3">&amp;&amp;</span> r2,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Pred pred <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="sy4">;</span></div>
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<td>(2)</td>
<td><span class="t-mark-rev t-since-cxx23">(C++23 &#36215;)</span></td>
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<p>&#26816;&#26597;&#31532;&#20108;&#33539;&#22260;&#26159;&#21542;&#21305;&#37197;&#31532;&#19968;&#33539;&#22260;&#30340;&#21069;&#32512;&#12290;</p>
<div class="t-li1"><span class="t-li">1)</span> &#20196; <code>N1</code> &#19982; <code>N2</code> &#20998;&#21035;&#20195;&#34920;&#33539;&#22260; <code>[first1, last1)</code> &#19982; <code>[first2, last2)</code> &#30340;&#22823;&#23567;&#12290;&#33509; <span class="t-c"><span class="mw-geshi cpp source-cpp">N1 <span class="sy1">&lt;</span> N2</span></span> &#21017;&#36820;&#22238; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span> &#12290;&#21542;&#21017;&#65292;&#24403;&#19988;&#20165;&#24403; <code>[first2, last2)</code> &#33539;&#22260;&#20013;&#30340;&#27599;&#20010;&#20803;&#32032;&#22343;&#31561;&#20110; <code>[first1, first1 + N2)</code> &#20013;&#30340;&#23545;&#24212;&#20803;&#32032;&#25165;&#36820;&#22238; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> &#12290;&#36890;&#36807;&#24212;&#29992;&#20108;&#20803;&#35859;&#35789; <code>pred</code> &#21040;&#20998;&#21035;&#30001; <code>proj1</code> &#19982; <code>proj2</code> &#25237;&#24433;&#30340;&#20004;&#20010;&#33539;&#22260;&#20013;&#30340;&#20803;&#32032;&#36827;&#34892;&#27604;&#36739;&#12290;</div>
<div class="t-li1"><span class="t-li">2)</span> &#21516;&#65292; <span class="t-v">(1)</span> &#65292;&#20294;&#20197; <code>r1</code> &#19982; <code>r2</code> &#20026;&#28304;&#33539;&#22260;&#65292;&#22914;&#21516;&#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> &#20026; <code>first1</code> &#65292;&#20197; <span class="t-c"><span class="mw-geshi cpp source-cpp">ranges<span class="sy4">:</span>begin<span class="br0">(</span>r2<span class="br0">)</span></span></span> &#20026; <code>first2</code> &#65292;&#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> &#20026; <code>last1</code> &#65292;&#24182;&#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>r2<span class="br0">)</span></span></span> &#20026; <code>last2</code> &#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>first1, last1</td>
<td>-</td>
<td>&#35201;&#26816;&#39564;&#30340;&#20803;&#32032;&#33539;&#22260;</td>
</tr>
<tr class="t-par">
<td>r1</td>
<td>-</td>
<td>&#35201;&#26816;&#39564;&#30340;&#20803;&#32032;&#33539;&#22260;</td>
</tr>
<tr class="t-par">
<td>first2, last2</td>
<td>-</td>
<td>&#35201;&#29992;&#20316;&#21069;&#32512;&#30340;&#20803;&#32032;&#33539;&#22260;</td>
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<tr class="t-par">
<td>r2</td>
<td>-</td>
<td>&#35201;&#29992;&#20316;&#21069;&#32512;&#30340;&#20803;&#32032;&#33539;&#22260;</td>
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<td>pred</td>
<td>-</td>
<td>&#27604;&#36739;&#25237;&#24433;&#21518;&#20803;&#32032;&#30340;&#20108;&#20803;&#35859;&#35789;</td>
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<td>proj1</td>
<td>-</td>
<td>&#24212;&#29992;&#21040;&#35201;&#26816;&#39564;&#30340;&#20803;&#32032;&#33539;&#22260;&#30340;&#25237;&#24433;</td>
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<td>proj2</td>
<td>-</td>
<td>&#24212;&#29992;&#21040;&#35201;&#29992;&#20316;&#21069;&#32512;&#30340;&#20803;&#32032;&#33539;&#22260;&#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;&#31532;&#20108;&#33539;&#22260;&#21305;&#37197;&#31532;&#19968;&#33539;&#22260;&#30340;&#21069;&#32512;&#21017;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> &#65292;&#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>&#32447;&#24615;&#65306;&#33267;&#22810;&#24212;&#29992; <code>min(N1, N2)</code> &#27425;&#35859;&#35789;&#21644;&#20004;&#20010;&#25237;&#24433;&#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> starts_with_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> Pred <span class="sy1">=</span> ranges<span class="sy4">::</span><span class="me2">equal_to</span>,
<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><span class="sy1">&gt;</span>
requires std<span class="sy4">::</span><span class="me2">indirectly_comparable</span><span class="sy1">&lt;</span>I1, I2, Pred, Proj1, Proj2<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,
Pred pred <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> ranges<span class="sy4">::</span><span class="me2">mismatch</span><span class="br0">(</span>std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>first1<span class="br0">)</span>, last1, std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>first2<span class="br0">)</span>, last2,
std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>pred<span class="br0">)</span>, std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>proj1<span class="br0">)</span>, std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>proj2<span class="br0">)</span>
<span class="br0">)</span>.<span class="me1">in2</span> <span class="sy1">==</span> last2<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> Pred <span class="sy1">=</span> ranges<span class="sy4">::</span><span class="me2">equal_to</span>,
<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><span class="sy1">&gt;</span>
requires std<span class="sy4">::</span><span class="me2">indirectly_comparable</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>,
ranges<span class="sy4">::</span><span class="me2">iterator_t</span><span class="sy1">&lt;</span>R2<span class="sy1">&gt;</span>,
Pred, Proj1, Proj2<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,
Pred pred <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>,
std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>pred<span class="br0">)</span>, std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>proj1<span class="br0">)</span>, std<span class="sy4">::</span><span class="me2">move</span><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> starts_with_fn starts_with<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;string_view&gt;</span>
<span class="co2">#include &lt;algorithm&gt;</span>
<span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;ranges&gt;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<span class="kw1">using</span> <span class="kw1">namespace</span> std<span class="sy4">::</span><span class="me2">literals</span><span class="sy4">;</span>
<span class="kw4">constexpr</span> <span class="kw4">auto</span> ascii_upper <span class="sy1">=</span> <span class="br0">[</span><span class="br0">]</span><span class="br0">(</span>char8_t c<span class="br0">)</span>
<span class="br0">{</span>
<span class="kw1">return</span> u8<span class="st0">&#39;a&#39;</span> <span class="sy1">&lt;=</span> c <span class="sy3">&amp;&amp;</span> c <span class="sy1">&lt;=</span> u8<span class="st0">&#39;z&#39;</span> <span class="sy4">?</span> <span class="kw1">static_cast</span><span class="sy1">&lt;</span>char8_t<span class="sy1">&gt;</span><span class="br0">(</span>c <span class="sy2">+</span> u8<span class="st0">&#39;A&#39;</span> <span class="sy2">-</span> u8<span class="st0">&#39;a&#39;</span><span class="br0">)</span> <span class="sy4">:</span> c<span class="sy4">;</span>
<span class="br0">}</span><span class="sy4">;</span>
<span class="kw4">constexpr</span> <span class="kw4">auto</span> cmp_ignore_case <span class="sy1">=</span> <span class="br0">[</span><span class="sy1">=</span><span class="br0">]</span><span class="br0">(</span>char8_t x, char8_t y<span class="br0">)</span>
<span class="br0">{</span>
<span class="kw1">return</span> ascii_upper<span class="br0">(</span>x<span class="br0">)</span> <span class="sy1">==</span> ascii_upper<span class="br0">(</span>y<span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span><span class="sy4">;</span>
static_assert<span class="br0">(</span>std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">starts_with</span><span class="br0">(</span><span class="st0">&quot;const_cast&quot;</span>, <span class="st0">&quot;const&quot;</span>sv<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
static_assert<span class="br0">(</span>std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">starts_with</span><span class="br0">(</span><span class="st0">&quot;constexpr&quot;</span>, <span class="st0">&quot;const&quot;</span>sv<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
static_assert<span class="br0">(</span><span class="sy3">!</span>std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">starts_with</span><span class="br0">(</span><span class="st0">&quot;volatile&quot;</span>, <span class="st0">&quot;const&quot;</span>sv<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="sy1">&lt;&lt;</span> std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">starts_with</span><span class="br0">(</span>u8<span class="st0">&quot;Constantinopolis&quot;</span>, u8<span class="st0">&quot;constant&quot;</span>sv,
<span class="br0">{</span><span class="br0">}</span>, ascii_upper, ascii_upper<span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39; &#39;</span>
<span class="sy1">&lt;&lt;</span> std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">starts_with</span><span class="br0">(</span>u8<span class="st0">&quot;Istanbul&quot;</span>, u8<span class="st0">&quot;constant&quot;</span>sv,
<span class="br0">{</span><span class="br0">}</span>, ascii_upper, ascii_upper<span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39; &#39;</span>
<span class="sy1">&lt;&lt;</span> std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">starts_with</span><span class="br0">(</span>u8<span class="st0">&quot;Metropolis&quot;</span>, u8<span class="st0">&quot;metro&quot;</span>sv,
cmp_ignore_case<span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39; &#39;</span>
<span class="sy1">&lt;&lt;</span> std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">starts_with</span><span class="br0">(</span>u8<span class="st0">&quot;Acropolis&quot;</span>, u8<span class="st0">&quot;metro&quot;</span>sv,
cmp_ignore_case<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="kw4">constexpr</span> <span class="kw4">static</span> <span class="kw4">auto</span> v <span class="sy1">=</span> <span class="br0">{</span> <span class="nu0">1</span>, <span class="nu0">3</span>, <span class="nu0">5</span>, <span class="nu0">7</span>, <span class="nu0">9</span> <span class="br0">}</span><span class="sy4">;</span>
<span class="kw4">constexpr</span> <span class="kw4">auto</span> odd <span class="sy1">=</span> <span class="br0">[</span><span class="br0">]</span><span class="br0">(</span><span class="kw4">int</span> x<span class="br0">)</span> <span class="br0">{</span> <span class="kw1">return</span> x <span class="sy2">%</span> <span class="nu0">2</span><span class="sy4">;</span> <span class="br0">}</span><span class="sy4">;</span>
static_assert<span class="br0">(</span> std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">starts_with</span><span class="br0">(</span> v, std<span class="sy4">::</span><span class="me2">views</span><span class="sy4">::</span><span class="me2">iota</span><span class="br0">(</span><span class="nu0">1</span><span class="br0">)</span>
<span class="sy3">|</span> std<span class="sy4">::</span><span class="me2">views</span><span class="sy4">::</span><span class="me2">filter</span><span class="br0">(</span>odd<span class="br0">)</span>
<span class="sy3">|</span> std<span class="sy4">::</span><span class="me2">views</span><span class="sy4">::</span><span class="me2">take</span><span class="br0">(</span><span class="nu0">3</span><span class="br0">)</span> <span class="br0">)</span> <span class="br0">)</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">true false true false</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-ends_with.html"><span class="t-lines"><span>ranges::ends_with</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx23">(C++23)</span></span></span></div>
</div>
</td>
<td>&#26816;&#26597;&#19968;&#20010;&#33539;&#22260;&#26159;&#21542;&#32456;&#20110;&#21478;&#19968;&#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-mismatch.html"><span class="t-lines"><span>ranges::mismatch</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>&#23547;&#25214;&#20004;&#20010;&#33539;&#22260;&#20986;&#29616;&#19981;&#21516;&#30340;&#39318;&#20010;&#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-string-basic_string-starts_with.html"><span class="t-lines"><span>starts_with</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>&#26816;&#26597; string &#26159;&#21542;&#22987;&#20110;&#32473;&#23450;&#21069;&#32512;<br />
<span class="t-mark">(<code>std::basic_string&lt;CharT,Traits,Allocator&gt;</code> &#30340;&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-string-basic_string_view-starts_with.html"><span class="t-lines"><span>starts_with</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>&#26816;&#26597; string_view &#26159;&#21542;&#22987;&#20110;&#32473;&#23450;&#21069;&#32512;<br />
<span class="t-mark">(<code>std::basic_string_view&lt;CharT,Traits&gt;</code> &#30340;&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
</tr>
</table>
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