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<title>std::basic_string&lt;CharT,Traits,Allocator&gt;::c_str</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::basic_string&lt;CharT,Traits,Allocator&gt;::</span>c_str</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.html">basic string</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">const</span> CharT<span class="sy2">*</span> c_str<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">const</span> CharT<span class="sy2">*</span> c_str<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-cxx11">(C++11 &#36215;)</span><br />
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> <span class="kw4">const</span> CharT<span class="sy2">*</span> c_str<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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<p>&#36820;&#22238;&#25351;&#21521;&#25317;&#26377;&#25968;&#25454;&#31561;&#20215;&#20110;&#23384;&#20648;&#20110;&#23383;&#31526;&#20018;&#20013;&#30340;&#31354;&#32456;&#27490;&#23383;&#31526;&#25968;&#32452;&#30340;&#25351;&#38024;&#12290;</p>
<p>&#35813;&#25351;&#38024;&#26377;&#33539;&#22260; <code>[c_str(); c_str() + size()]</code> &#20026;&#21512;&#27861;&#65292;&#19988;&#20854;&#20013;&#30340;&#20540;&#23545;&#24212;&#23384;&#20648;&#20110;&#23383;&#31526;&#20018;&#30340;&#20540;&#65292;&#19988;&#22312;&#26368;&#21518;&#20301;&#32622;&#26377;&#20010;&#38468;&#21152;&#30340;&#31354;&#32456;&#27490;&#23383;&#31526;&#12290;</p>
<p>&#20174; <code>c_str()</code> &#33719;&#24471;&#30340;&#25351;&#38024;&#21487;&#33021;&#34987;&#19979;&#21015;&#34892;&#20026;&#38750;&#27861;&#21270;&#65306;</p>
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<li>&#20256;&#36882;&#32473;&#20219;&#20309;&#38750;&#26631;&#20934;&#24211;&#20989;&#25968;&#23383;&#31526;&#20018;&#30340;&#38750; const &#24341;&#29992;&#65292;&#25110;</li>
<li>&#22312;&#23383;&#31526;&#20018;&#19978;&#35843;&#29992;&#38750; const &#25104;&#21592;&#20989;&#25968;&#65292;&#21253;&#25324; <span class="t-lc"><a href="cpp-string-basic_string-operator_at.html">operator[]</a></span> &#12289; <span class="t-lc"><a href="cpp-string-basic_string-at.html">at()</a></span> &#12289; <span class="t-lc"><a href="cpp-string-basic_string-front.html">front()</a></span> &#12289; <span class="t-lc"><a href="cpp-string-basic_string-back.html">back()</a></span> &#12289; <span class="t-lc"><a href="cpp-string-basic_string-begin.html">begin()</a></span> &#12289; <span class="t-lc"><a href="cpp-string-basic_string-rbegin.html">rbegin()</a></span> &#12289; <span class="t-lc"><a href="cpp-string-basic_string-end.html">end()</a></span> &#21450; <span class="t-lc"><a href="cpp-string-basic_string-rend.html">rend()</a></span> &#12290;</li>
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<p>&#36890;&#36807; <code>c_str()</code> &#20889;&#20837;&#23383;&#31526;&#25968;&#32452;&#26159;&#26410;&#23450;&#20041;&#34892;&#20026;&#12290;</p>
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<p><code>c_str()</code> &#19982; <span class="t-lc"><a href="cpp-string-basic_string-data.html">data()</a></span> &#36827;&#34892;&#21516;&#19968;&#21151;&#33021;&#12290;</p>
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<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>&#25351;&#21521;&#24213;&#23618;&#23383;&#31526;&#23384;&#20648;&#30340;&#25351;&#38024;&#12290;</p>
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<p>&#23545;&#20110;&#27599;&#20010; <code>[0, size())</code> &#20013;&#30340; <code>i</code> &#26377; <span class="t-c"><span class="mw-geshi cpp source-cpp">c_str<span class="br0">(</span><span class="br0">)</span><span class="br0">[</span>i<span class="br0">]</span> <span class="sy1">==</span> operator<span class="br0">[</span><span class="br0">]</span><span class="br0">(</span>i<span class="br0">)</span></span></span> &#12290;</p>
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<p>&#23545;&#20110;&#27599;&#20010; <code>[0, size()]</code> &#20013;&#30340; <code>i</code> &#26377; <span class="t-c"><span class="mw-geshi cpp source-cpp">c_str<span class="br0">(</span><span class="br0">)</span> <span class="sy2">+</span> i <span class="sy1">==</span> <a href="cpp-memory-addressof.html"><span class="kw757">std::<span class="me2">addressof</span></span></a><span class="br0">(</span>operator<span class="br0">[</span><span class="br0">]</span><span class="br0">(</span>i<span class="br0">)</span><span class="br0">)</span></span></span> &#12290;</p>
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<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=".E6.B3.A8.E6.84.8F">&#27880;&#24847;</span></h3>
<p>&#20174; <code>c_str()</code> &#33719;&#24471;&#30340;&#25351;&#38024;&#21487;&#20197;&#21482;&#24403;&#20570;&#19968;&#20010;&#25351;&#21521;&#31354;&#32456;&#27490;&#23383;&#31526;&#20018;&#30340;&#25351;&#38024;&#65292;&#33509; string &#23545;&#35937;&#19981;&#21547;&#20854;&#20182;&#31354;&#23383;&#31526;&#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;algorithm&gt;</span>
<span class="co2">#include &lt;cassert&gt;</span>
<span class="co2">#include &lt;cstring&gt;</span>
<span class="co2">#include &lt;string&gt;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a> <span class="kw4">const</span> s<span class="br0">(</span><span class="st0">&quot;Emplary&quot;</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-error-assert.html"><span class="kw774">assert</span></a><span class="br0">(</span>s.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> <a href="cpp-string-byte-strlen.html"><span class="kw1145">std::<span class="me2">strlen</span></span></a><span class="br0">(</span>s.<span class="me1">c_str</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-error-assert.html"><span class="kw774">assert</span></a><span class="br0">(</span><a href="cpp-algorithm-equal.html"><span class="kw1573">std::<span class="me2">equal</span></span></a><span class="br0">(</span>s.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, s.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span>, s.<span class="me1">c_str</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-error-assert.html"><span class="kw774">assert</span></a><span class="br0">(</span><a href="cpp-algorithm-equal.html"><span class="kw1573">std::<span class="me2">equal</span></span></a><span class="br0">(</span>s.<span class="me1">c_str</span><span class="br0">(</span><span class="br0">)</span>, s.<span class="me1">c_str</span><span class="br0">(</span><span class="br0">)</span> <span class="sy2">+</span> s.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span>, s.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-error-assert.html"><span class="kw774">assert</span></a><span class="br0">(</span><span class="nu0">0</span> <span class="sy1">==</span> <span class="sy2">*</span><span class="br0">(</span>s.<span class="me1">c_str</span><span class="br0">(</span><span class="br0">)</span> <span class="sy2">+</span> s.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span></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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