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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">&#26631;&#20934;&#24211;&#22836;&#25991;&#20214;</span> &lt;strstream&gt;</h1>
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<p>&#27492;&#22836;&#25991;&#20214;&#26159;<a href="cpp-io.html">&#36755;&#20837;/&#36755;&#20986;</a>&#24211;&#30340;&#19968;&#37096;&#20998;&#12290;</p>
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<h3><span class="mw-headline" id=".E7.B1.BB">&#31867;</span></h3>
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<div><a href="cpp-io-strstreambuf.html"><span class="t-lines"><span>strstreambuf</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-deprecated-cxx98">(C++98 &#20013;&#24323;&#29992;)</span></span></span></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-deprecated-cxx98">(C++98 &#20013;&#24323;&#29992;)</span></span></span></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-deprecated-cxx98">(C++98 &#20013;&#24323;&#29992;)</span></span></span></div>
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<td>&#23454;&#29616;&#23383;&#31526;&#25968;&#32452;&#36755;&#20837;/&#36755;&#20986;&#25805;&#20316;<br />
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<h3><span class="mw-headline" id=".E6.A6.82.E8.A6.81">&#27010;&#35201;</span></h3>
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<div class="cpp source-cpp">
<pre class="de1"><span class="kw1">namespace</span> std <span class="br0">{</span>
<span class="kw1">class</span> strstreambuf<span class="sy4">;</span>
<span class="kw1">class</span> istrstream<span class="sy4">;</span>
<span class="kw1">class</span> ostrstream<span class="sy4">;</span>
<span class="kw1">class</span> strstream<span class="sy4">;</span>
<span class="br0">}</span></pre></div>
</div>
<h4><span class="mw-headline" id=".E7.B1.BB_std::strstreambuf">&#31867; <span class="t-lc"><a href="cpp-io-strstreambuf.html">std::strstreambuf</a></span></span></h4>
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<div class="cpp source-cpp">
<pre class="de1"><span class="kw1">namespace</span> std <span class="br0">{</span>
<span class="kw1">class</span> strstreambuf <span class="sy4">:</span> <span class="kw1">public</span> basic_streambuf<span class="sy1">&lt;</span><span class="kw4">char</span><span class="sy1">&gt;</span> <span class="br0">{</span>
<span class="kw1">public</span><span class="sy4">:</span>
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>
<span class="kw1">explicit</span> strstreambuf<span class="br0">(</span>streamsize alsize_arg<span class="br0">)</span><span class="sy4">;</span>
strstreambuf<span class="br0">(</span><span class="kw4">void</span><span class="sy2">*</span> <span class="br0">(</span><span class="sy2">*</span>palloc_arg<span class="br0">)</span><span class="br0">(</span>size_t<span class="br0">)</span>, <span class="kw4">void</span> <span class="br0">(</span><span class="sy2">*</span>pfree_arg<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>
strstreambuf<span class="br0">(</span><span class="kw4">char</span><span class="sy2">*</span> gnext_arg, streamsize n, <span class="kw4">char</span><span class="sy2">*</span> pbeg_arg <span class="sy1">=</span> nullptr<span class="br0">)</span><span class="sy4">;</span>
strstreambuf<span class="br0">(</span><span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> gnext_arg, streamsize n<span class="br0">)</span><span class="sy4">;</span>
strstreambuf<span class="br0">(</span><span class="kw4">signed</span> <span class="kw4">char</span><span class="sy2">*</span> gnext_arg, streamsize n,
<span class="kw4">signed</span> <span class="kw4">char</span><span class="sy2">*</span> pbeg_arg <span class="sy1">=</span> nullptr<span class="br0">)</span><span class="sy4">;</span>
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_arg, streamsize n<span class="br0">)</span><span class="sy4">;</span>
strstreambuf<span class="br0">(</span><span class="kw4">unsigned</span> <span class="kw4">char</span><span class="sy2">*</span> gnext_arg, streamsize n,
<span class="kw4">unsigned</span> <span class="kw4">char</span><span class="sy2">*</span> pbeg_arg <span class="sy1">=</span> nullptr<span class="br0">)</span><span class="sy4">;</span>
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_arg, streamsize n<span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">virtual</span> ~strstreambuf<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw4">void</span> freeze<span class="br0">(</span><span class="kw4">bool</span> freezefl <span class="sy1">=</span> <span class="kw2">true</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw4">char</span><span class="sy2">*</span> str<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw4">int</span> pcount<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">protected</span><span class="sy4">:</span>
int_type overflow <span class="br0">(</span>int_type c <span class="sy1">=</span> <a href="cpp-io-c.html"><span class="kw1882">EOF</span></a><span class="br0">)</span> override<span class="sy4">;</span>
int_type pbackfail<span class="br0">(</span>int_type c <span class="sy1">=</span> <a href="cpp-io-c.html"><span class="kw1882">EOF</span></a><span class="br0">)</span> override<span class="sy4">;</span>
int_type underflow<span class="br0">(</span><span class="br0">)</span> override<span class="sy4">;</span>
pos_type seekoff<span class="br0">(</span>off_type off, ios_base<span class="sy4">::</span><span class="me2">seekdir</span> way,
ios_base<span class="sy4">::</span><span class="me2">openmode</span> which <span class="sy1">=</span> ios_base<span class="sy4">::</span><span class="me2">in</span> <span class="sy3">|</span> ios_base<span class="sy4">::</span><span class="me2">out</span><span class="br0">)</span> override<span class="sy4">;</span>
pos_type seekpos<span class="br0">(</span>pos_type sp,
ios_base<span class="sy4">::</span><span class="me2">openmode</span> which <span class="sy1">=</span> ios_base<span class="sy4">::</span><span class="me2">in</span> <span class="sy3">|</span> ios_base<span class="sy4">::</span><span class="me2">out</span><span class="br0">)</span> override<span class="sy4">;</span>
streambuf<span class="sy2">*</span> setbuf<span class="br0">(</span><span class="kw4">char</span><span class="sy2">*</span> s, streamsize n<span class="br0">)</span> override<span class="sy4">;</span>
<span class="kw1">private</span><span class="sy4">:</span>
<span class="kw1">using</span> strstate <span class="sy1">=</span> <span class="coMULTI">/*&#20301;&#25513;&#30721;&#31867;&#22411;*/</span><span class="sy4">;</span> <span class="co1">// &#20165;&#29992;&#20110;&#38416;&#37322;</span>
<span class="kw4">static</span> <span class="kw4">const</span> strstate allocated<span class="sy4">;</span> <span class="co1">// &#20165;&#29992;&#20110;&#38416;&#37322;</span>
<span class="kw4">static</span> <span class="kw4">const</span> strstate constant<span class="sy4">;</span> <span class="co1">// &#20165;&#29992;&#20110;&#38416;&#37322;</span>
<span class="kw4">static</span> <span class="kw4">const</span> strstate dynamic<span class="sy4">;</span> <span class="co1">// &#20165;&#29992;&#20110;&#38416;&#37322;</span>
<span class="kw4">static</span> <span class="kw4">const</span> strstate frozen<span class="sy4">;</span> <span class="co1">// &#20165;&#29992;&#20110;&#38416;&#37322;</span>
strstate strmode<span class="sy4">;</span> <span class="co1">// &#20165;&#29992;&#20110;&#38416;&#37322;</span>
streamsize alsize<span class="sy4">;</span> <span class="co1">// &#20165;&#29992;&#20110;&#38416;&#37322;</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>size_t<span class="br0">)</span><span class="sy4">;</span> <span class="co1">// &#20165;&#29992;&#20110;&#38416;&#37322;</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="sy4">;</span> <span class="co1">// &#20165;&#29992;&#20110;&#38416;&#37322;</span>
<span class="br0">}</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
</div>
<h4><span class="mw-headline" id=".E7.B1.BB_std::istrstream">&#31867; <span class="t-lc"><a href="cpp-io-istrstream.html">std::istrstream</a></span></span></h4>
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<div class="cpp source-cpp">
<pre class="de1"><span class="kw1">namespace</span> std <span class="br0">{</span>
<span class="kw1">class</span> istrstream <span class="sy4">:</span> <span class="kw1">public</span> basic_istream<span class="sy1">&lt;</span><span class="kw4">char</span><span class="sy1">&gt;</span> <span class="br0">{</span>
<span class="kw1">public</span><span class="sy4">:</span>
<span class="kw1">explicit</span> istrstream<span class="br0">(</span><span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> s<span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">explicit</span> istrstream<span class="br0">(</span><span class="kw4">char</span><span class="sy2">*</span> s<span class="br0">)</span><span class="sy4">;</span>
istrstream<span class="br0">(</span><span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> s, streamsize n<span class="br0">)</span><span class="sy4">;</span>
istrstream<span class="br0">(</span><span class="kw4">char</span><span class="sy2">*</span> s, streamsize n<span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">virtual</span> ~istrstream<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
strstreambuf<span class="sy2">*</span> rdbuf<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
<span class="kw4">char</span><span class="sy2">*</span> str<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">private</span><span class="sy4">:</span>
strstreambuf sb<span class="sy4">;</span> <span class="co1">// &#20165;&#29992;&#20110;&#38416;&#37322;</span>
<span class="br0">}</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
</div>
<h4><span class="mw-headline" id=".E7.B1.BB_std::ostrstream">&#31867; <span class="t-lc"><a href="cpp-io-ostrstream.html">std::ostrstream</a></span></span></h4>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="cpp source-cpp">
<pre class="de1"><span class="kw1">namespace</span> std <span class="br0">{</span>
<span class="kw1">class</span> ostrstream <span class="sy4">:</span> <span class="kw1">public</span> basic_ostream<span class="sy1">&lt;</span><span class="kw4">char</span><span class="sy1">&gt;</span> <span class="br0">{</span>
<span class="kw1">public</span><span class="sy4">:</span>
ostrstream<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
ostrstream<span class="br0">(</span><span class="kw4">char</span><span class="sy2">*</span> s, <span class="kw4">int</span> n, ios_base<span class="sy4">::</span><span class="me2">openmode</span> mode <span class="sy1">=</span> ios_base<span class="sy4">::</span><span class="me2">out</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">virtual</span> ~ostrstream<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
strstreambuf<span class="sy2">*</span> rdbuf<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
<span class="kw4">void</span> freeze<span class="br0">(</span><span class="kw4">bool</span> freezefl <span class="sy1">=</span> <span class="kw2">true</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw4">char</span><span class="sy2">*</span> str<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw4">int</span> pcount<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
<span class="kw1">private</span><span class="sy4">:</span>
strstreambuf sb<span class="sy4">;</span> <span class="co1">// &#20165;&#29992;&#20110;&#38416;&#37322;</span>
<span class="br0">}</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
</div>
<h4><span class="mw-headline" id=".E7.B1.BB_std::strstream">&#31867; <span class="t-lc"><a href="cpp-io-strstream.html">std::strstream</a></span></span></h4>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="cpp source-cpp">
<pre class="de1"><span class="kw1">namespace</span> std <span class="br0">{</span>
<span class="kw1">class</span> strstream
<span class="sy4">:</span> <span class="kw1">public</span> basic_iostream<span class="sy1">&lt;</span><span class="kw4">char</span><span class="sy1">&gt;</span> <span class="br0">{</span>
<span class="kw1">public</span><span class="sy4">:</span>
<span class="co1">// &#31867;&#22411;</span>
<span class="kw1">using</span> char_type <span class="sy1">=</span> <span class="kw4">char</span><span class="sy4">;</span>
<span class="kw1">using</span> int_type <span class="sy1">=</span> char_traits<span class="sy1">&lt;</span><span class="kw4">char</span><span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">int_type</span><span class="sy4">;</span>
<span class="kw1">using</span> pos_type <span class="sy1">=</span> char_traits<span class="sy1">&lt;</span><span class="kw4">char</span><span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">pos_type</span><span class="sy4">;</span>
<span class="kw1">using</span> off_type <span class="sy1">=</span> char_traits<span class="sy1">&lt;</span><span class="kw4">char</span><span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">off_type</span><span class="sy4">;</span>
<span class="co1">// &#26500;&#36896;&#20989;&#25968;/&#26512;&#26500;&#20989;&#25968;</span>
strstream<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
strstream<span class="br0">(</span><span class="kw4">char</span><span class="sy2">*</span> s, <span class="kw4">int</span> n,
ios_base<span class="sy4">::</span><span class="me2">openmode</span> mode <span class="sy1">=</span> ios_base<span class="sy4">::</span><span class="me2">in</span> <span class="sy3">|</span> ios_base<span class="sy4">::</span><span class="me2">out</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">virtual</span> ~strstream<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
<span class="co1">// &#25104;&#21592;</span>
strstreambuf<span class="sy2">*</span> rdbuf<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
<span class="kw4">void</span> freeze<span class="br0">(</span><span class="kw4">bool</span> freezefl <span class="sy1">=</span> <span class="kw2">true</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw4">int</span> pcount<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
<span class="kw4">char</span><span class="sy2">*</span> str<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">private</span><span class="sy4">:</span>
strstreambuf sb<span class="sy4">;</span> <span class="co1">// &#20165;&#29992;&#20110;&#38416;&#37322;</span>
<span class="br0">}</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
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