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<title>std::basic_string_view&lt;CharT,Traits&gt;::contains</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::basic_string_view&lt;CharT,Traits&gt;::</span>contains</h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-string.html">string</a>&lrm; | <a href="cpp-string-basic_string_view.html">basic string view</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> <span class="kw4">bool</span> contains<span class="br0">(</span> basic_string_view sv <span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</span><span class="sy4">;</span></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="kw4">constexpr</span> <span class="kw4">bool</span> contains<span class="br0">(</span> CharT c <span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</span><span class="sy4">;</span></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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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> <span class="kw4">bool</span> contains<span class="br0">(</span> <span class="kw4">const</span> CharT<span class="sy2">*</span> s <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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<td>(3)</td>
<td><span class="t-mark-rev t-since-cxx23">(C++23 &#36215;)</span></td>
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<p>&#26816;&#26597;&#23383;&#31526;&#20018;&#35270;&#22270;&#26159;&#21542;&#21547;&#26377;&#32473;&#23450;&#30340;&#23376;&#20018;&#65292;&#20854;&#20013;</p>
<div class="t-li1"><span class="t-li">1)</span> &#23376;&#20018;&#20026;&#23383;&#31526;&#20018;&#35270;&#22270;&#12290;</div>
<div class="t-li1"><span class="t-li">2)</span> &#23376;&#20018;&#20026;&#21333;&#20010;&#23383;&#31526;&#12290;</div>
<div class="t-li1"><span class="t-li">3)</span> &#23383;&#20018;&#20026;&#31354;&#32456;&#27490;&#23383;&#31526;&#20018;&#12290;</div>
<p>&#25152;&#26377;&#19977;&#20010;&#37325;&#36733;&#37117;&#31561;&#20215;&#20110; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw1">return</span> find<span class="br0">(</span>x<span class="br0">)</span> <span class="sy3">!</span><span class="sy1">=</span> npos<span class="sy4">;</span></span></span> &#65292;&#20854;&#20013; <code>x</code> &#20026;&#21442;&#25968;&#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
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<td>sv</td>
<td>-</td>
<td>&#23383;&#31526;&#20018;&#35270;&#22270;</td>
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<td>c</td>
<td>-</td>
<td>&#21333;&#20010;&#23383;&#31526;</td>
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<td>s</td>
<td>-</td>
<td>&#31354;&#32456;&#27490;&#23383;&#31526;&#20018;</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;&#23383;&#31526;&#20018;&#35270;&#22270;&#21547;&#26377;&#32473;&#23450;&#30340;&#23376;&#20018;&#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=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
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<pre class="de1"><span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;string_view&gt;</span>
<span class="kw4">auto</span> main<span class="br0">(</span><span class="br0">)</span> <span class="sy2">-</span><span class="sy1">&gt;</span> <span class="kw4">int</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>
<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="co1">// bool contains(basic_string_view x) const noexcept;</span>
<span class="sy1">&lt;&lt;</span> <span class="st0">&quot;https://cppreference.com&quot;</span>sv.<span class="me1">contains</span><span class="br0">(</span><span class="st0">&quot;cpp&quot;</span>sv<span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39; &#39;</span> <span class="co1">// true</span>
<span class="sy1">&lt;&lt;</span> <span class="st0">&quot;https://cppreference.com&quot;</span>sv.<span class="me1">contains</span><span class="br0">(</span><span class="st0">&quot;java&quot;</span>sv<span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39; &#39;</span> <span class="co1">// false</span>
<span class="co1">// bool contains(CharT x) const noexcept;</span>
<span class="sy1">&lt;&lt;</span> <span class="st0">&quot;C++23&quot;</span>sv.<span class="me1">contains</span><span class="br0">(</span><span class="st0">&#39;+&#39;</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39; &#39;</span> <span class="co1">// true</span>
<span class="sy1">&lt;&lt;</span> <span class="st0">&quot;C++23&quot;</span>sv.<span class="me1">contains</span><span class="br0">(</span><span class="st0">&#39;-&#39;</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39; &#39;</span> <span class="co1">// false</span>
<span class="co1">// bool contains(const CharT* x) const;</span>
<span class="sy1">&lt;&lt;</span> <a href="cpp-string-basic_string_view.html"><span class="kw1248">std::<span class="me2">string_view</span></span></a><span class="br0">(</span><span class="st0">&quot;basic_string_view&quot;</span><span class="br0">)</span>.<span class="me1">contains</span><span class="br0">(</span><span class="st0">&quot;string&quot;</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39; &#39;</span> <span class="co1">// true</span>
<span class="sy1">&lt;&lt;</span> <a href="cpp-string-basic_string_view.html"><span class="kw1248">std::<span class="me2">string_view</span></span></a><span class="br0">(</span><span class="st0">&quot;basic_string_view&quot;</span><span class="br0">)</span>.<span class="me1">contains</span><span class="br0">(</span><span class="st0">&quot;String&quot;</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39; &#39;</span> <span class="co1">// false</span>
<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></pre></div>
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<p>&#36755;&#20986;&#65306;</p>
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<pre class="de1">true false 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>
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<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>
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<td>&#26816;&#26597; string_view &#26159;&#21542;&#22987;&#20110;&#32473;&#23450;&#21069;&#32512;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div><a href="cpp-string-basic_string_view-ends_with.html"><span class="t-lines"><span>ends_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>
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<td>&#26816;&#26597; string_view &#26159;&#21542;&#32456;&#20110;&#32473;&#23450;&#21518;&#32512;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div><a href="cpp-string-basic_string_view-find.html"><span class="t-lines"><span>find</span></span></a></div>
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<td>&#22312;&#35270;&#22270;&#20013;&#26597;&#25214;&#23383;&#31526;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div><a href="cpp-string-basic_string_view-substr.html"><span class="t-lines"><span>substr</span></span></a></div>
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<td>&#36820;&#22238;&#23376;&#20018;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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