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<title>std::basic_string_view&lt;CharT,Traits&gt;::size, std::basic_string_view&lt;CharT,Traits&gt;::length</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>size, <span style="font-size:0.7em; line-height:130%">std::basic_string_view&lt;CharT,Traits&gt;::</span>length</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> size_type size<span class="br0">(</span><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><span class="t-mark-rev t-since-cxx17">(C++17 &#36215;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> size_type length<span class="br0">(</span><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><span class="t-mark-rev t-since-cxx17">(C++17 &#36215;)</span></td>
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<p>&#36820;&#22238;&#35270;&#22270;&#20013;&#30340; <code>CharT</code> &#20803;&#32032;&#25968;&#65292;&#21363; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-iterator-distance.html"><span class="kw673">std::<span class="me2">distance</span></span></a><span class="br0">(</span>begin<span class="br0">(</span><span class="br0">)</span>, end<span class="br0">(</span><span class="br0">)</span><span class="br0">)</span></span></span> &#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
<p>&#65288;&#26080;&#65289;</p>
<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<p>&#35270;&#22270;&#20013;&#30340; <code>CharT</code> &#20803;&#32032;&#25968;&#12290;</p>
<h3><span class="mw-headline" id=".E5.A4.8D.E6.9D.82.E5.BA.A6">&#22797;&#26434;&#24230;</span></h3>
<p>&#24120;&#25968;&#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;string_view&gt;</span>
<span class="co2">#include &lt;iostream&gt;</span>
<span class="kw4">void</span> check_string<span class="br0">(</span><a href="cpp-string-basic_string_view.html"><span class="kw1248">std::<span class="me2">string_view</span></span></a> ref<span class="br0">)</span>
<span class="br0">{</span>
<span class="co1">// &#25171;&#21360;&#20197;&#21333;&#24341;&#21495;&#29615;&#32469;&#30340;&#23383;&#31526;&#20018;&#12289;&#23427;&#30340;&#38271;&#24230;&#21450;&#20854;&#26159;&#21542;&#20026;&#31354;&#12290;</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> <span class="st0">&quot;&#39;&quot;</span> <span class="sy1">&lt;&lt;</span> ref <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;&#39; has &quot;</span> <span class="sy1">&lt;&lt;</span> ref.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span>
<span class="sy1">&lt;&lt;</span> <span class="st0">&quot; character(s); emptiness: &quot;</span> <span class="sy1">&lt;&lt;</span> ref.<span class="me1">empty</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>
<span class="br0">}</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="kw4">int</span> argc, <span class="kw4">char</span> <span class="sy2">**</span>argv<span class="br0">)</span>
<span class="br0">{</span>
<span class="co1">// &#31354;&#23383;&#31526;&#20018;</span>
check_string<span class="br0">(</span><span class="st0">&quot;&quot;</span><span class="br0">)</span><span class="sy4">;</span>
<span class="co1">// &#20960;&#20046;&#22987;&#32456;&#38750;&#31354;&#65306; argv[0]</span>
<span class="kw1">if</span> <span class="br0">(</span>argc <span class="sy1">&gt;</span> <span class="nu0">0</span><span class="br0">)</span>
check_string<span class="br0">(</span>argv<span class="br0">[</span><span class="nu0">0</span><span class="br0">]</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
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<p>&#21487;&#33021;&#30340;&#36755;&#20986;&#65306;</p>
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<pre class="de1">&#39;&#39; has 0 character(s); emptiness: true
&#39;./a.out&#39; has 7 character(s); emptiness: 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-empty.html"><span class="t-lines"><span>empty</span></span></a></div>
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<td>&#26816;&#26597;&#35270;&#22270;&#26159;&#21542;&#20026;&#31354;<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-max_size.html"><span class="t-lines"><span>max_size</span></span></a></div>
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<td>&#36820;&#22238;&#26368;&#22823;&#23383;&#31526;&#25968;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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