84 lines
6.4 KiB
HTML
84 lines
6.4 KiB
HTML
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<title>std::basic_iostream<CharT,Traits>::basic_iostream</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_io_basic_iostream_basic_iostream skin-cppreference2 action-view cpp-navbar">
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::basic_iostream<CharT,Traits>::</span>basic_iostream</h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-io.html">io</a>‎ | <a href="cpp-io-basic_iostream.html">basic iostream</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">explicit</span> basic_iostream<span class="br0">(</span> <a href="cpp-io-basic_streambuf.html"><span class="kw1666">std::<span class="me2">basic_streambuf</span></span></a><span class="sy1"><</span>CharT,Traits<span class="sy1">></span><span class="sy2">*</span> sb <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(1)</td>
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<td class="t-dcl-nopad"></td>
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<div><span class="mw-geshi cpp source-cpp">basic_iostream<span class="br0">(</span> <span class="kw4">const</span> basic_iostream<span class="sy3">&</span> other <span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span></span></div>
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<td>(2)</td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">protected</span><span class="sy4">:</span><br />
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basic_iostream<span class="br0">(</span> basic_iostream<span class="sy3">&&</span> other <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(3)</td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<td></td>
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<td></td>
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<td></td>
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<p>构造新的流对象。</p>
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<div class="t-li1"><span class="t-li">1)</span> 以 streambuf <code>sb</code> 初始化。基类初始化为 <span class="t-c"><span class="mw-geshi cpp source-cpp">basic_istream<span class="sy1"><</span>CharT,Traits<span class="sy1">></span><span class="br0">(</span>sb<span class="br0">)</span></span></span> 和 <span class="t-c"><span class="mw-geshi cpp source-cpp">basic_ostream<span class="sy1"><</span>CharT,Traits<span class="sy1">></span><span class="br0">(</span>sb<span class="br0">)</span></span></span> 。调用后 <span class="t-c"><span class="mw-geshi cpp source-cpp">rdbuf<span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> sb</span></span> 而 <span class="t-c"><span class="mw-geshi cpp source-cpp">gcount<span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> <span class="nu0">0</span></span></span> 。</div>
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<div class="t-li1"><span class="t-li">2)</span> 不允许复制构造。</div>
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<div class="t-li1"><span class="t-li">3)</span> 移动构造函数：移动构造第一基类 <code>basic_istream</code> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp">basic_istream<span class="sy1"><</span>CharT,Traits<span class="sy1">></span><span class="br0">(</span>std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>rhs<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span></span></span> ，这会继续移动构造并初始化虚基类 <span class="t-lc"><a href="cpp-io-basic_ios.html">std::basic_ios</a></span> 。另一基类 <code>basic_ostream</code> 的初始化是实现定义的（例如，可以添加不做任何事的受保护默认构造函数到 <span class="t-lc"><a href="cpp-io-basic_ostream.html">std::basic_ostream</a></span> ），因为移动构造不能使用 <code>rhs</code> 二次。此移动构造函数受保护：它为导出流类 <span class="t-lc"><a href="cpp-io-basic_fstream.html">std::basic_fstream</a></span> 和 <span class="t-lc"><a href="cpp-io-basic_stringstream.html">std::basic_stringstream</a></span> 的移动构造函数在它们移动并关联流缓冲前调用。</div>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
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<td>sb</td>
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<td>-</td>
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<td>用以初始化的 streambuf</td>
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<tr class="t-par">
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<td>other</td>
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<td>-</td>
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<td>用以初始化的另一流</td>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<div><a href="cpp-io-basic_iostream-operator=.html"><span class="t-lines"><span>operator=</span></span></a></div>
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<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>移动赋值另一 <code>basic_iostream</code><br />
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<span class="t-mark">(受保护成员函数)</span></td>
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