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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::strstreambuf::</span>strstreambuf</h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-io.html">io</a>&lrm; | <a href="cpp-io-strstreambuf.html">strstreambuf</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">explicit</span> strstreambuf<span class="br0">(</span> <a href="cpp-io-streamsize.html"><span class="kw1804">std::<span class="me2">streamsize</span></span></a> alsize <span class="sy1">=</span> <span class="nu0">0</span> <span class="br0">)</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">strstreambuf<span class="br0">(</span><span class="br0">)</span> <span class="sy4">:</span> strstreambuf<span class="br0">(</span><span class="nu0">0</span><span class="br0">)</span> <span class="br0">{</span><span class="br0">}</span><br />
<span class="kw1">explicit</span> strstreambuf<span class="br0">(</span> <a href="cpp-io-streamsize.html"><span class="kw1804">std::<span class="me2">streamsize</span></span></a> alsize <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
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<div><span class="mw-geshi cpp source-cpp">strstreambuf<span class="br0">(</span> <span class="kw4">void</span><span class="sy2">*</span> <span class="br0">(</span><span class="sy2">*</span>palloc<span class="br0">)</span><span class="br0">(</span><a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a><span class="br0">)</span>, <span class="kw4">void</span> <span class="br0">(</span><span class="sy2">*</span>pfree<span class="br0">)</span><span class="br0">(</span><span class="kw4">void</span><span class="sy2">*</span><span class="br0">)</span> <span class="br0">)</span><span class="sy4">;</span></span></div>
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<div><span class="mw-geshi cpp source-cpp">strstreambuf<span class="br0">(</span> <span class="kw4">char</span><span class="sy2">*</span> gnext, <a href="cpp-io-streamsize.html"><span class="kw1804">std::<span class="me2">streamsize</span></span></a> n, <span class="kw4">char</span><span class="sy2">*</span> pbeg <span class="sy1">=</span> <span class="nu0">0</span> <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(3)</td>
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<div><span class="mw-geshi cpp source-cpp">strstreambuf<span class="br0">(</span> <span class="kw4">signed</span> <span class="kw4">char</span><span class="sy2">*</span> gnext, <a href="cpp-io-streamsize.html"><span class="kw1804">std::<span class="me2">streamsize</span></span></a> n, <span class="kw4">signed</span> <span class="kw4">char</span><span class="sy2">*</span> pbeg <span class="sy1">=</span> <span class="nu0">0</span> <span class="br0">)</span><span class="sy4">;</span></span></div>
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<div><span class="mw-geshi cpp source-cpp">strstreambuf<span class="br0">(</span> <span class="kw4">unsigned</span> <span class="kw4">char</span><span class="sy2">*</span> gnext, <a href="cpp-io-streamsize.html"><span class="kw1804">std::<span class="me2">streamsize</span></span></a> n, <span class="kw4">unsigned</span> <span class="kw4">char</span><span class="sy2">*</span> pbeg <span class="sy1">=</span> <span class="nu0">0</span> <span class="br0">)</span><span class="sy4">;</span></span></div>
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<div><span class="mw-geshi cpp source-cpp">strstreambuf<span class="br0">(</span> <span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> gnext, <a href="cpp-io-streamsize.html"><span class="kw1804">std::<span class="me2">streamsize</span></span></a> n <span class="br0">)</span><span class="sy4">;</span></span></div>
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<div><span class="mw-geshi cpp source-cpp">strstreambuf<span class="br0">(</span> <span class="kw4">const</span> <span class="kw4">signed</span> <span class="kw4">char</span><span class="sy2">*</span> gnext, <a href="cpp-io-streamsize.html"><span class="kw1804">std::<span class="me2">streamsize</span></span></a> n<span class="br0">)</span><span class="sy4">;</span></span></div>
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<div><span class="mw-geshi cpp source-cpp">strstreambuf<span class="br0">(</span> <span class="kw4">const</span> <span class="kw4">unsigned</span> <span class="kw4">char</span><span class="sy2">*</span> gnext, <a href="cpp-io-streamsize.html"><span class="kw1804">std::<span class="me2">streamsize</span></span></a> n <span class="br0">)</span><span class="sy4">;</span></span></div>
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<div class="t-li1"><span class="t-li">1)</span> &#26500;&#36896; <code>std::strstreambuf</code> &#23545;&#35937;&#65306;&#36890;&#36807;&#35843;&#29992; <span class="t-lc"><a href="cpp-io-basic_streambuf.html">std::streambuf</a></span> &#30340;&#40664;&#35748;&#26500;&#36896;&#20989;&#25968;&#21021;&#22987;&#21270;&#22522;&#31867;&#65292;&#21021;&#22987;&#21270;&#32531;&#20914;&#29366;&#24577;&#20026;&ldquo;&#21160;&#24577;&rdquo;&#65288;&#23558;&#25353;&#38656;&#20998;&#37197;&#32531;&#20914;&#21306;&#65289;&#65292;&#21021;&#22987;&#21270;&#24050;&#20998;&#37197;&#22823;&#23567;&#20026;&#25552;&#20379;&#30340; <code>alsize</code> &#65292;&#21021;&#22987;&#21270;&#20998;&#37197;&#21644;&#35299;&#20998;&#37197;&#20989;&#25968;&#20026;&#31354;&#20540;&#65288;&#23558;&#20351;&#29992; <span class="t-c"><span class="mw-geshi cpp source-cpp">new<span class="br0">[</span><span class="br0">]</span></span></span> &#19982; <span class="t-c"><span class="mw-geshi cpp source-cpp">delete<span class="br0">[</span><span class="br0">]</span></span></span> &#65289;&#12290;</div>
<div class="t-li1"><span class="t-li">2)</span> &#26500;&#36896; <code>std::strstreambuf</code> &#23545;&#35937;&#65306;&#36890;&#36807;&#35843;&#29992; <span class="t-lc"><a href="cpp-io-basic_streambuf.html">std::streambuf</a></span> &#30340;&#40664;&#35748;&#26500;&#36896;&#20989;&#25968;&#21021;&#22987;&#21270;&#22522;&#31867;&#65292;&#21021;&#22987;&#21270;&#32531;&#20914;&#29366;&#24577;&#20026;&ldquo;&#21160;&#24577;&rdquo;&#65288;&#23558;&#25353;&#38656;&#20998;&#37197;&#32531;&#20914;&#21306;&#65289;&#65292;&#21021;&#22987;&#21270;&#24050;&#20998;&#37197;&#22823;&#23567;&#20026;&#26410;&#25351;&#23450;&#20540;&#65292;&#21021;&#22987;&#21270;&#20998;&#37197;&#20989;&#25968;&#20026; <code>palloc</code> &#65292;&#35299;&#20998;&#37197;&#20989;&#25968;&#20026; <code>pfree</code> &#12290;</div>
<div class="t-li1"><span class="t-li">3-5)</span> &#20381;&#19979;&#21015;&#27493;&#39588;&#26500;&#36896; <code>std::strstreambuf</code> &#23545;&#35937;&#65306;</div>
<div class="t-li2"><span class="t-li">a)</span> &#36890;&#36807;&#35843;&#29992; <span class="t-lc"><a href="cpp-io-basic_streambuf.html">std::streambuf</a></span> &#30340;&#40664;&#35748;&#26500;&#36896;&#20989;&#25968;&#21021;&#22987;&#21270;&#22522;&#31867;</div>
<div class="t-li2"><span class="t-li">b)</span> &#21021;&#22987;&#21270;&#32531;&#20914;&#29366;&#24577;&#20026;&ldquo;&#20923;&#32467;&rdquo;&#65288;&#32531;&#20914;&#21306;&#20026;&#29992;&#25143;&#25552;&#20379;&#30340;&#22266;&#23450;&#22823;&#23567;&#32531;&#20914;&#21306;&#65289;</div>
<div class="t-li2"><span class="t-li">c)</span> &#20197;&#19979;&#21015;&#26041;&#24335;&#30830;&#23450;&#29992;&#25143;&#25552;&#20379;&#30340;&#25968;&#32452;&#20013;&#30340;&#20803;&#32032;&#25968;&#65306;&#33509; <code>n</code> &#22823;&#20110;&#38646;&#65292;&#21017;&#20351;&#29992; <code>n</code> &#12290;&#33509; <code>n</code> &#20026;&#65292;&#21017;&#25191;&#34892; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-string-byte-strlen.html"><span class="kw1145">std::<span class="me2">strlen</span></span></a><span class="br0">(</span>gnext<span class="br0">)</span></span></span> &#30830;&#23450;&#32531;&#20914;&#21306;&#22823;&#23567;&#12290;&#33509; <code>n</code> &#20026;&#36127;&#65292;&#21017;&#20351;&#29992; <span class="t-lc"><a href="cpp-types-climits.html">INT_MAX</a></span> &#12290;</div>
<div class="t-li2"><span class="t-li">d)</span> &#20197;&#19979;&#21015;&#26041;&#24335;&#37197;&#32622; <span class="t-lc"><a href="cpp-io-basic_streambuf.html">std::basic_streambuf</a></span> &#30340;&#25351;&#38024;&#65306;&#33509; <code>pbeg</code> &#20026;&#31354;&#25351;&#38024;&#65292;&#21017;&#35843;&#29992; <span class="t-c"><span class="mw-geshi cpp source-cpp">setg<span class="br0">(</span>gnext, gnext, gnext <span class="sy2">+</span> N<span class="br0">)</span></span></span> &#12290;&#33509; <code>pbeg</code> &#19981;&#26159;&#31354;&#25351;&#38024;&#65292;&#21017;&#25191;&#34892; <span class="t-c"><span class="mw-geshi cpp source-cpp">setg<span class="br0">(</span>gnext, gnext, pbeg<span class="br0">)</span></span></span> &#21644; <span class="t-c"><span class="mw-geshi cpp source-cpp">setp<span class="br0">(</span>pbeg, pbeg<span class="sy2">+</span>N<span class="br0">)</span></span></span> &#65292;&#20854;&#20013; N &#26159;&#20043;&#21069;&#30830;&#23450;&#30340;&#25968;&#32452;&#20013;&#30340;&#20803;&#32032;&#25968;&#12290;</div>
<div class="t-li1"><span class="t-li">6-8)</span> &#21516; <span class="t-c"><span class="mw-geshi cpp source-cpp">strstreambuf<span class="br0">(</span><span class="br0">(</span><span class="kw4">char</span><span class="sy2">*</span><span class="br0">)</span>gnext, n<span class="br0">)</span></span></span> &#65292;&#38500;&#20102;&#22312;&#32531;&#20914;&#29366;&#24577;&#20301;&#25513;&#30721;&#20013;&#35774;&#32622;&ldquo;&#24120;&#37327;&rdquo;&#65288;&#19981;&#20801;&#35768;&#36755;&#20986;&#21040;&#27492;&#32531;&#20914;&#21306;&#65289;&#12290;</div>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
<table class="t-par-begin">
<tr class="t-par">
<td>alsize</td>
<td>-</td>
<td>&#21160;&#24577;&#20998;&#37197;&#30340;&#32531;&#20914;&#21306;&#30340;&#21021;&#22987;&#22823;&#23567;</td>
</tr>
<tr class="t-par">
<td>palloc</td>
<td>-</td>
<td>&#25351;&#21521;&#29992;&#25143;&#25552;&#20379;&#30340;&#20998;&#37197;&#20989;&#25968;&#30340;&#25351;&#38024;</td>
</tr>
<tr class="t-par">
<td>pfree</td>
<td>-</td>
<td>&#25351;&#21521;&#29992;&#25143;&#25552;&#20379;&#30340;&#35299;&#20998;&#37197;&#20989;&#25968;&#30340;&#25351;&#38024;</td>
</tr>
<tr class="t-par">
<td>gnext</td>
<td>-</td>
<td>&#25351;&#21521;&#29992;&#25143;&#25552;&#20379;&#30340;&#25968;&#32452;&#20013;&#33719;&#21462;&#21306;&#36215;&#22987;&#30340;&#25351;&#38024;</td>
</tr>
<tr class="t-par">
<td>pbeg</td>
<td>-</td>
<td>&#25351;&#21521;&#29992;&#25143;&#25552;&#20379;&#30340;&#25968;&#32452;&#20013;&#25918;&#32622;&#21306;&#36215;&#22987;&#30340;&#25351;&#38024;</td>
</tr>
<tr class="t-par">
<td>n</td>
<td>-</td>
<td>&#29992;&#25143;&#25552;&#20379;&#25968;&#32452;&#30340;&#33719;&#21462;&#21306;&#65288;&#33509; pbeg &#20026;&#31354;&#65289;&#25110;&#25918;&#32622;&#21306;&#65288;&#33509; pbeg &#38750;&#31354;&#65289;&#20013;&#30340;&#23383;&#33410;&#25968;</td>
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<h3><span class="mw-headline" id=".E6.B3.A8.E6.84.8F">&#27880;&#24847;</span></h3>
<p>&#36825;&#20123;&#26500;&#36896;&#20989;&#25968;&#24120;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-io-strstream.html"><span class="kw1755">std::<span class="me2">strstream</span></span></a></span></span> &#30340;&#26500;&#36896;&#20989;&#25968;&#25152;&#35843;&#29992;</p>
<h3><span class="mw-headline" id=".E7.BC.BA.E9.99.B7.E6.8A.A5.E5.91.8A">&#32570;&#38519;&#25253;&#21578;</span></h3>
<p>&#19979;&#21015;&#26356;&#25913;&#34892;&#20026;&#30340;&#32570;&#38519;&#25253;&#21578;&#36861;&#28335;&#22320;&#24212;&#29992;&#20110;&#20197;&#21069;&#20986;&#29256;&#30340; C++ &#26631;&#20934;&#12290;</p>
<table class="dsctable" style="font-size:0.8em">
<tr>
<th>DR</th>
<th>&#24212;&#29992;&#20110;</th>
<th>&#20986;&#29256;&#26102;&#30340;&#34892;&#20026;</th>
<th>&#27491;&#30830;&#34892;&#20026;</th>
</tr>
<tr>
<td><a rel="nofollow" class="external text" href="https://wg21.link/P0935R0">P0935R0</a></td>
<td>C++11</td>
<td>&#40664;&#35748;&#26500;&#36896;&#20989;&#25968;&#26366;&#20026; explicit</td>
<td>&#20351;&#20043;&#20026;&#38544;&#24335;</td>
</tr>
</table>
<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;strstream&gt;</span>
<span class="co2">#include &lt;iostream&gt;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<a href="cpp-io-strstreambuf.html"><span class="kw1752">std::<span class="me2">strstreambuf</span></span></a> dyn<span class="sy4">;</span> <span class="co1">// &#21160;&#24577;</span>
<a href="cpp-io-strstream.html"><span class="kw1755">std::<span class="me2">strstream</span></span></a> dyn_s<span class="sy4">;</span> <span class="co1">// &#31561;&#20215;&#30340;&#27969;</span>
dyn_s <span class="sy1">&lt;&lt;</span> <span class="nu16">1.23</span> <span class="sy1">&lt;&lt;</span> <a href="cpp-io-manip-ends.html"><span class="kw1789">std::<span class="me2">ends</span></span></a><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> dyn_s.<span class="me1">str</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>
dyn_s.<span class="me1">freeze</span><span class="br0">(</span><span class="kw2">false</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw4">char</span> buf<span class="br0">[</span><span class="nu0">10</span><span class="br0">]</span><span class="sy4">;</span>
<a href="cpp-io-strstreambuf.html"><span class="kw1752">std::<span class="me2">strstreambuf</span></span></a> user<span class="br0">(</span>buf, <span class="nu0">10</span>, buf<span class="br0">)</span><span class="sy4">;</span> <span class="co1">// &#29992;&#25143;&#25552;&#20379;&#30340;&#36755;&#20986;&#32531;&#20914;&#21306;</span>
<a href="cpp-io-ostrstream.html"><span class="kw1754">std::<span class="me2">ostrstream</span></span></a> user_s<span class="br0">(</span>buf, <span class="nu0">10</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// &#31561;&#20215;&#30340;&#27969;</span>
user_s <span class="sy1">&lt;&lt;</span> <span class="nu16">1.23</span> <span class="sy1">&lt;&lt;</span> <a href="cpp-io-manip-ends.html"><span class="kw1789">std::<span class="me2">ends</span></span></a><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> buf <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span>
<a href="cpp-io-strstreambuf.html"><span class="kw1752">std::<span class="me2">strstreambuf</span></span></a> lit<span class="br0">(</span><span class="st0">&quot;1 2 3&quot;</span>, <span class="nu0">5</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// &#24120;&#37327;</span>
<a href="cpp-io-istrstream.html"><span class="kw1753">std::<span class="me2">istrstream</span></span></a> lit_s<span class="br0">(</span><span class="st0">&quot;1 2 3&quot;</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// &#31561;&#20215;&#30340;&#27969;</span>
<span class="kw4">int</span> i, j, k<span class="sy4">;</span>
lit_s <span class="sy1">&gt;&gt;</span> i <span class="sy1">&gt;&gt;</span> j <span class="sy1">&gt;&gt;</span> k<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> i <span class="sy1">&lt;&lt;</span> <span class="st0">&#39; &#39;</span> <span class="sy1">&lt;&lt;</span> j <span class="sy1">&lt;&lt;</span> <span class="st0">&#39; &#39;</span> <span class="sy1">&lt;&lt;</span> k <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>
</div>
<p>&#36755;&#20986;&#65306;</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="text source-text">
<pre class="de1">1.23
1.23
1 2 3</pre></div>
</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">
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<div class="t-dsc-member-div t-dsc-member-nobold-div">
<div><a href="cpp-io-strstream-strstream.html"><span class="t-lines"><span>(&#26500;&#36896;&#20989;&#25968;)</span></span></a></div>
</div>
</td>
<td>&#26500;&#36896; strstream &#65292;&#21487;&#36873;&#22320;&#20998;&#37197;&#32531;&#20914;&#21306;<br />
<span class="t-mark">(<code>std::strstream</code> &#30340;&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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</div>
<div class="visualClear"></div>
</div>
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