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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>data</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> data<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-until-cxx11">(C++11 &#21069;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">const</span> CharT<span class="sy2">*</span> data<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> data<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-cxx20">(C++20 &#36215;)</span></td>
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<div><span class="mw-geshi cpp source-cpp">CharT<span class="sy2">*</span> data<span class="br0">(</span><span class="br0">)</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><br />
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> CharT<span class="sy2">*</span> data<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></td>
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<p>&#36820;&#22238;&#25351;&#21521;&#20316;&#20026;&#23383;&#31526;&#23384;&#20648;&#24037;&#20316;&#30340;&#24213;&#23618;&#25968;&#32452;&#30340;&#25351;&#38024;&#12290;&#27492;&#25351;&#38024;&#28385;&#36275;&#33539;&#22260; <span class="t-rev-inl t-until-cxx11"><span><code>[data(); data() + size())</code></span> <span><span class="t-mark-rev t-until-cxx11">(C++11 &#21069;)</span></span></span> <span class="t-rev-inl t-since-cxx11"><span><code>[data(); data() + size()]</code></span> <span><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></span></span> &#20026;&#21512;&#27861;&#65292;&#19988;&#20854;&#20013;&#30340;&#20540;&#23545;&#24212;&#23384;&#20648;&#20110;&#23383;&#31526;&#20018;&#30340;&#20540;&#12290;</p>
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<p>&#19981;&#35201;&#27714;&#36820;&#22238;&#30340;&#25968;&#32452;&#26159;&#31354;&#32456;&#27490;&#30340;&#12290;</p>
<p>&#33509; <span class="t-lc"><a href="cpp-string-basic_string-empty.html">empty()</a></span> &#36820;&#22238; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> &#65292;&#21017;&#25351;&#38024;&#25351;&#21521;&#19981;&#24212;&#35299;&#24341;&#29992;&#30340;&#38750;&#31354;&#25351;&#38024;&#12290;</p>
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<td><span class="t-mark-rev t-until-cxx11">(C++11 &#21069;)</span></td>
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<p>&#36820;&#22238;&#30340;&#25968;&#32452;&#26159;&#31354;&#32456;&#27490;&#30340;&#65292;&#21363; <code>data()</code> &#19982; <span class="t-lc"><a href="cpp-string-basic_string-c_str.html">c_str()</a></span> &#36827;&#34892;&#21516;&#19968;&#21151;&#33021;&#12290;</p>
<p>&#33509; <span class="t-lc"><a href="cpp-string-basic_string-empty.html">empty()</a></span> &#36820;&#22238; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> &#65292;&#21017;&#25351;&#38024;&#25351;&#21521;&#21333;&#20010;&#31354;&#23383;&#31526;&#12290;</p>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
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<p>&#25351;&#21521; <code>data()</code> &#30340;&#25351;&#38024;&#21487;&#33021;&#22240;&#20197;&#19979;&#24773;&#20917;&#38750;&#27861;&#65306;</p>
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<li>&#20256;&#36882;&#38750; const &#24341;&#29992;&#32473;&#20219;&#20309;&#26631;&#20934;&#24211;&#20989;&#25968;&#65292;&#25110;</li>
<li>&#22312; string &#19978;&#35843;&#29992;&#38750; const &#25104;&#21592;&#20989;&#25968;&#65292;&#38500;&#20102; <a href="cpp-string-basic_string-operator_at.html"><code>operator[]()</code></a> &#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-end.html">end()</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-rend.html">rend()</a></span> &#12290;</li>
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<div class="t-li1"><span class="t-li">1)</span> &#36890;&#36807; <code>data</code> &#30340; const &#37325;&#36733;&#20462;&#25913;&#25968;&#32452;&#26377;&#26410;&#23450;&#20041;&#34892;&#20026;&#12290;</div>
<div class="t-li1"><span class="t-li">2)</span> &#20462;&#25913;&#23384;&#20648;&#20110; <code>data() + size()</code> &#30340;&#23614;&#21518;&#31354;&#32456;&#27490;&#31526;&#20026;&#20219;&#20309;&#24322;&#20110; <code>CharT()</code> &#30340;&#20540;&#26377;&#26410;&#23450;&#20041;&#34892;&#20026;&#12290;</div>
<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; <code>[0, size())</code> &#20013;&#27599;&#20010; <code>i</code> &#26377; <span class="t-c"><span class="mw-geshi cpp source-cpp">data<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; <code>[0, size()]</code> &#20013;&#27599;&#20010; <code>i</code> &#26377; <span class="t-c"><span class="mw-geshi cpp source-cpp">data<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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<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
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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=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
<div class="t-example">
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<div class="cpp source-cpp">
<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">data</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">data</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">data</span><span class="br0">(</span><span class="br0">)</span>, s.<span class="me1">data</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">data</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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<div><a href="cpp-string-basic_string-front.html"><span class="t-lines"><span>front</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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<td>&#35775;&#38382;&#39318;&#23383;&#31526;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-string-basic_string-back.html"><span class="t-lines"><span>back</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
</div>
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<td>&#35775;&#38382;&#26368;&#21518;&#30340;&#23383;&#31526;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-string-basic_string-c_str.html"><span class="t-lines"><span>c_str</span></span></a></div>
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<td>&#36820;&#22238;&#23383;&#31526;&#20018;&#30340;&#19981;&#21487;&#20462;&#25913;&#30340; C &#23383;&#31526;&#25968;&#32452;&#29256;&#26412;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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