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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;syncstream&gt;</h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-header.html">header</a></span></div>
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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>
<table class="t-dsc-begin">
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<h3><span class="mw-headline" id=".E5.8C.85.E5.90.AB">&#21253;&#21547;</span></h3>
</td>
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<td>
<div class="t-dsc-member-div">
<div><a href="cpp-header-ostream.html"><span class="t-lines"><span>&lt;ostream&gt;</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
</div>
</td>
<td><span class="t-lc"><a href="cpp-io-basic_ostream.html">std::basic_ostream</a></span> &#12289; <span class="t-lc"><a href="cpp-io-basic_iostream.html">std::basic_iostream</a></span> &#31867;&#27169;&#26495;&#19982;&#25968;&#20010; typedef</td>
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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-basic_syncbuf.html"><span class="t-lines"><span>basic_syncbuf</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
</div>
</td>
<td>&#21516;&#27493;&#36755;&#20986;&#35774;&#22791;&#30340;&#21253;&#35013;<br />
<span class="t-mark">(&#31867;&#27169;&#26495;)</span></td>
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<div><a href="cpp-io-basic_osyncstream.html"><span class="t-lines"><span>basic_osyncstream</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
</div>
</td>
<td>&#21516;&#27493;&#36755;&#20986;&#27969;&#30340;&#21253;&#35013;<br />
<span class="t-mark">(&#31867;&#27169;&#26495;)</span></td>
</tr>
<tr class="t-dsc">
<td><code>syncbuf</code><span class="t-mark-rev t-since-cxx20">(C++20)</span></td>
<td><span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">basic_syncbuf</span><span class="sy1">&lt;</span><span class="kw4">char</span><span class="sy1">&gt;</span></span></span><br />
<span class="t-mark">(typedef)</span></td>
</tr>
<tr class="t-dsc">
<td><code>wsyncbuf</code><span class="t-mark-rev t-since-cxx20">(C++20)</span></td>
<td><span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">basic_syncbuf</span><span class="sy1">&lt;</span><span class="kw4">wchar_t</span><span class="sy1">&gt;</span></span></span><br />
<span class="t-mark">(typedef)</span></td>
</tr>
<tr class="t-dsc">
<td><code>osyncstream</code><span class="t-mark-rev t-since-cxx20">(C++20)</span></td>
<td><span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">basic_osyncstream</span><span class="sy1">&lt;</span><span class="kw4">char</span><span class="sy1">&gt;</span></span></span><br />
<span class="t-mark">(typedef)</span></td>
</tr>
<tr class="t-dsc">
<td><code>wosyncstream</code><span class="t-mark-rev t-since-cxx20">(C++20)</span></td>
<td><span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">basic_osyncstream</span><span class="sy1">&lt;</span><span class="kw4">wchar_t</span><span class="sy1">&gt;</span></span></span><br />
<span class="t-mark">(typedef)</span></td>
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<h3><span class="mw-headline" id=".E5.87.BD.E6.95.B0">&#20989;&#25968;</span></h3>
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<div><a href="cpp-io-basic_syncbuf-swap2.html"><span class="t-lines"><span>std::swap<span class="t-dsc-small">(std::basic_syncbuf)</span></span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
</div>
</td>
<td>&#29305;&#21270; <span class="t-lc"><a href="cpp-algorithm-swap.html">std::swap</a></span> &#31639;&#27861;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
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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="co2">#include &lt;ostream&gt;</span>
<span class="kw1">namespace</span> std <span class="br0">{</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> CharT, <span class="kw1">class</span> Traits <span class="sy1">=</span> char_traits<span class="sy1">&lt;</span>CharT<span class="sy1">&gt;</span>,
<span class="kw1">class</span> Allocator <span class="sy1">=</span> allocator<span class="sy1">&lt;</span>CharT<span class="sy1">&gt;&gt;</span>
<span class="kw1">class</span> basic_syncbuf<span class="sy4">;</span>
<span class="kw1">using</span> syncbuf <span class="sy1">=</span> basic_syncbuf<span class="sy1">&lt;</span><span class="kw4">char</span><span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="kw1">using</span> wsyncbuf <span class="sy1">=</span> basic_syncbuf<span class="sy1">&lt;</span><span class="kw4">wchar_t</span><span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> CharT, <span class="kw1">class</span> Traits <span class="sy1">=</span> char_traits<span class="sy1">&lt;</span>CharT<span class="sy1">&gt;</span>,
<span class="kw1">class</span> Allocator <span class="sy1">=</span> allocator<span class="sy1">&lt;</span>CharT<span class="sy1">&gt;&gt;</span>
<span class="kw1">class</span> basic_osyncstream<span class="sy4">;</span>
<span class="kw1">using</span> osyncstream <span class="sy1">=</span> basic_osyncstream<span class="sy1">&lt;</span><span class="kw4">char</span><span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="kw1">using</span> wosyncstream <span class="sy1">=</span> basic_osyncstream<span class="sy1">&lt;</span><span class="kw4">wchar_t</span><span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
</div>
<h4><span class="mw-headline" id=".E7.B1.BB.E6.A8.A1.E6.9D.BF_std::basic_syncbuf">&#31867;&#27169;&#26495; <span class="t-lc">std::basic_syncbuf</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">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> CharT, <span class="kw1">class</span> Traits <span class="sy1">=</span> char_traits<span class="sy1">&lt;</span>CharT<span class="sy1">&gt;</span>,
<span class="kw1">class</span> Allocator <span class="sy1">=</span> allocator<span class="sy1">&lt;</span>CharT<span class="sy1">&gt;&gt;</span>
<span class="kw1">class</span> basic_syncbuf <span class="sy4">:</span> <span class="kw1">public</span> basic_streambuf<span class="sy1">&lt;</span>CharT, Traits<span class="sy1">&gt;</span> <span class="br0">{</span>
<span class="kw1">public</span><span class="sy4">:</span>
<span class="kw1">using</span> char_type <span class="sy1">=</span> CharT<span class="sy4">;</span>
<span class="kw1">using</span> int_type <span class="sy1">=</span> <span class="kw1">typename</span> Traits<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> <span class="kw1">typename</span> Traits<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> <span class="kw1">typename</span> Traits<span class="sy4">::</span><span class="me2">off_type</span><span class="sy4">;</span>
<span class="kw1">using</span> traits_type <span class="sy1">=</span> Traits<span class="sy4">;</span>
<span class="kw1">using</span> allocator_type <span class="sy1">=</span> Allocator<span class="sy4">;</span>
<span class="kw1">using</span> streambuf_type <span class="sy1">=</span> basic_streambuf<span class="sy1">&lt;</span>CharT, Traits<span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="co1">// &#26500;&#36896;&#19982;&#26512;&#26500;</span>
basic_syncbuf<span class="br0">(</span><span class="br0">)</span>
<span class="sy4">:</span> basic_syncbuf<span class="br0">(</span>nullptr<span class="br0">)</span> <span class="br0">{</span><span class="br0">}</span>
<span class="kw1">explicit</span> basic_syncbuf<span class="br0">(</span>streambuf_type<span class="sy2">*</span> obuf<span class="br0">)</span>
<span class="sy4">:</span> basic_syncbuf<span class="br0">(</span>obuf, Allocator<span class="br0">(</span><span class="br0">)</span><span class="br0">)</span> <span class="br0">{</span><span class="br0">}</span>
basic_syncbuf<span class="br0">(</span>streambuf_type<span class="sy2">*</span>, <span class="kw4">const</span> Allocator<span class="sy3">&amp;</span><span class="br0">)</span><span class="sy4">;</span>
basic_syncbuf<span class="br0">(</span>basic_syncbuf<span class="sy3">&amp;&amp;</span><span class="br0">)</span><span class="sy4">;</span>
~basic_syncbuf<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
<span class="co1">// &#36171;&#20540;&#19982;&#20132;&#25442;</span>
basic_syncbuf<span class="sy3">&amp;</span> operator<span class="sy1">=</span><span class="br0">(</span>basic_syncbuf<span class="sy3">&amp;&amp;</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw4">void</span> swap<span class="br0">(</span>basic_syncbuf<span class="sy3">&amp;</span><span class="br0">)</span><span class="sy4">;</span>
<span class="co1">// &#25104;&#21592;&#20989;&#25968;</span>
<span class="kw4">bool</span> emit<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
streambuf_type<span class="sy2">*</span> get_wrapped<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
allocator_type get_allocator<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="kw4">void</span> set_emit_on_sync<span class="br0">(</span><span class="kw4">bool</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="kw1">protected</span><span class="sy4">:</span>
<span class="co1">// &#35206;&#30422;&#30340;&#34394;&#20989;&#25968;</span>
<span class="kw4">int</span> sync<span class="br0">(</span><span class="br0">)</span> override<span class="sy4">;</span>
<span class="kw1">private</span><span class="sy4">:</span>
streambuf_type<span class="sy2">*</span> wrapped<span class="sy4">;</span> <span class="co1">// &#20165;&#29992;&#20110;&#38416;&#37322;</span>
<span class="kw4">bool</span> emit_on_sync<span class="br0">{</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="co1">// &#29305;&#21270;&#30340;&#31639;&#27861;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> CharT, <span class="kw1">class</span> Traits, <span class="kw1">class</span> Allocator<span class="sy1">&gt;</span>
<span class="kw4">void</span> swap<span class="br0">(</span>basic_syncbuf<span class="sy1">&lt;</span>CharT, Traits, Allocator<span class="sy1">&gt;</span><span class="sy3">&amp;</span>,
basic_syncbuf<span class="sy1">&lt;</span>CharT, Traits, Allocator<span class="sy1">&gt;</span><span class="sy3">&amp;</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.E6.A8.A1.E6.9D.BF_std::basic_osyncstream">&#31867;&#27169;&#26495; <span class="t-lc">std::basic_osyncstream</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">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> CharT, <span class="kw1">class</span> Traits <span class="sy1">=</span> char_traits<span class="sy1">&lt;</span>CharT<span class="sy1">&gt;</span>,
<span class="kw1">class</span> Allocator <span class="sy1">=</span> allocator<span class="sy1">&lt;</span>CharT<span class="sy1">&gt;&gt;</span>
<span class="kw1">class</span> basic_syncbuf <span class="sy4">:</span> <span class="kw1">public</span> basic_streambuf<span class="sy1">&lt;</span>CharT, Traits<span class="sy1">&gt;</span> <span class="br0">{</span>
<span class="kw1">public</span><span class="sy4">:</span>
<span class="kw1">using</span> char_type <span class="sy1">=</span> CharT<span class="sy4">;</span>
<span class="kw1">using</span> int_type <span class="sy1">=</span> <span class="kw1">typename</span> Traits<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> <span class="kw1">typename</span> Traits<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> <span class="kw1">typename</span> Traits<span class="sy4">::</span><span class="me2">off_type</span><span class="sy4">;</span>
<span class="kw1">using</span> traits_type <span class="sy1">=</span> Traits<span class="sy4">;</span>
<span class="kw1">using</span> allocator_type <span class="sy1">=</span> Allocator<span class="sy4">;</span>
<span class="kw1">using</span> streambuf_type <span class="sy1">=</span> basic_streambuf<span class="sy1">&lt;</span>CharT, Traits<span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="co1">// &#26500;&#36896;&#19982;&#26512;&#26500;</span>
basic_syncbuf<span class="br0">(</span><span class="br0">)</span>
<span class="sy4">:</span> basic_syncbuf<span class="br0">(</span>nullptr<span class="br0">)</span> <span class="br0">{</span><span class="br0">}</span>
<span class="kw1">explicit</span> basic_syncbuf<span class="br0">(</span>streambuf_type<span class="sy2">*</span> obuf<span class="br0">)</span>
<span class="sy4">:</span> basic_syncbuf<span class="br0">(</span>obuf, Allocator<span class="br0">(</span><span class="br0">)</span><span class="br0">)</span> <span class="br0">{</span><span class="br0">}</span>
basic_syncbuf<span class="br0">(</span>streambuf_type<span class="sy2">*</span>, <span class="kw4">const</span> Allocator<span class="sy3">&amp;</span><span class="br0">)</span><span class="sy4">;</span>
basic_syncbuf<span class="br0">(</span>basic_syncbuf<span class="sy3">&amp;&amp;</span><span class="br0">)</span><span class="sy4">;</span>
~basic_syncbuf<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
<span class="co1">// &#36171;&#20540;&#19982;&#20132;&#25442;</span>
basic_syncbuf<span class="sy3">&amp;</span> operator<span class="sy1">=</span><span class="br0">(</span>basic_syncbuf<span class="sy3">&amp;&amp;</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw4">void</span> swap<span class="br0">(</span>basic_syncbuf<span class="sy3">&amp;</span><span class="br0">)</span><span class="sy4">;</span>
<span class="co1">// &#25104;&#21592;&#20989;&#25968;</span>
<span class="kw4">bool</span> emit<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
streambuf_type<span class="sy2">*</span> get_wrapped<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
allocator_type get_allocator<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="kw4">void</span> set_emit_on_sync<span class="br0">(</span><span class="kw4">bool</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="kw1">protected</span><span class="sy4">:</span>
<span class="co1">// &#35206;&#30422;&#30340;&#34394;&#20989;&#25968;</span>
<span class="kw4">int</span> sync<span class="br0">(</span><span class="br0">)</span> override<span class="sy4">;</span>
<span class="kw1">private</span><span class="sy4">:</span>
streambuf_type<span class="sy2">*</span> wrapped<span class="sy4">;</span> <span class="co1">// &#20165;&#29992;&#20110;&#38416;&#37322;</span>
<span class="kw4">bool</span> emit_on_sync<span class="br0">{</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="co1">// &#29305;&#21270;&#30340;&#31639;&#27861;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> CharT, <span class="kw1">class</span> Traits, <span class="kw1">class</span> Allocator<span class="sy1">&gt;</span>
<span class="kw4">void</span> swap<span class="br0">(</span>basic_syncbuf<span class="sy1">&lt;</span>CharT, Traits, Allocator<span class="sy1">&gt;</span><span class="sy3">&amp;</span>,
basic_syncbuf<span class="sy1">&lt;</span>CharT, Traits, Allocator<span class="sy1">&gt;</span><span class="sy3">&amp;</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
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