110 lines
8.1 KiB
HTML
110 lines
8.1 KiB
HTML
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<title>std::basic_filebuf<CharT,Traits>::operator=</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_io_basic_filebuf_operator 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_filebuf<CharT,Traits>::</span>operator=</h1>
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<div id="bodyContent">
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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_filebuf.html">basic filebuf</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><a href="cpp-io-basic_filebuf.html"><span class="kw1667">std::<span class="me2">basic_filebuf</span></span></a><span class="sy3">&</span> operator<span class="sy1">=</span><span class="br0">(</span> <a href="cpp-io-basic_filebuf.html"><span class="kw1667">std::<span class="me2">basic_filebuf</span></span></a><span class="sy3">&&</span> rhs <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 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><a href="cpp-io-basic_filebuf.html"><span class="kw1667">std::<span class="me2">basic_filebuf</span></span></a><span class="sy3">&</span> operator<span class="sy1">=</span><span class="br0">(</span> <span class="kw4">const</span> <a href="cpp-io-basic_filebuf.html"><span class="kw1667">std::<span class="me2">basic_filebuf</span></span></a><span class="sy3">&</span> rhs <span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span></span></div>
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<p>赋值另一 <code>basic_filebuf</code> 对象。</p>
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<div class="t-li1"><span class="t-li">1)</span> 首先调用 <span class="t-lc"><a href="cpp-io-basic_filebuf-close.html">close()</a></span> 关闭关联文件，然后移动 <code>rhs</code> 的内容到 <code>*this</code> 中：获取与放置缓冲区、本地环境、打开模式、打开标志及任何其他状态。移动后， <code>rhs</code> 不与文件关联且 <span class="t-c"><span class="mw-geshi cpp source-cpp">rhs.<span class="me1">is_open</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> <span class="kw2">false</span></span></span> 。</div>
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<div class="t-li1"><span class="t-li">2)</span> 复制赋值运算符被删除； <code>basic_filebuf</code> 不<a href="cpp-named_req-CopyAssignable.html"><span style="font-style:italic">可复制赋值</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(CopyAssignable)</span></a> 。</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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<table class="t-par-begin">
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<td>rhs</td>
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<td>-</td>
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<td>将被移动的另一 <code>basic_filebuf</code></td>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
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<p><code>*this</code></p>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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<div class="cpp source-cpp">
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<pre class="de1"><span class="co2">#include <fstream></span>
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<span class="co2">#include <string></span>
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<span class="co2">#include <iostream></span>
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<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
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<span class="br0">{</span>
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<a href="cpp-io-basic_ifstream.html"><span class="kw1732">std::<span class="me2">ifstream</span></span></a> fin<span class="br0">(</span><span class="st0">"test.in"</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 只读</span>
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<a href="cpp-io-basic_ofstream.html"><span class="kw1733">std::<span class="me2">ofstream</span></span></a> fout<span class="br0">(</span><span class="st0">"test.out"</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 只写</span>
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<a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a> s<span class="sy4">;</span>
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getline<span class="br0">(</span>fin, s<span class="br0">)</span><span class="sy4">;</span>
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<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> s <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span> <span class="co1">// 输出</span>
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<span class="sy2">*</span>fin.<span class="me1">rdbuf</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span><span class="sy2">*</span>fout.<span class="me1">rdbuf</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
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getline<span class="br0">(</span>fin, s<span class="br0">)</span><span class="sy4">;</span>
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<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> s <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span> <span class="co1">// 空行</span>
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<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <a href="cpp-io-manip-boolalpha.html"><span class="kw1764">std::<span class="me2">boolalpha</span></span></a> <span class="sy1"><<</span> fout.<span class="me1">is_open</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span> <span class="co1">// 打印 "false"</span>
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<span class="br0">}</span></pre></div>
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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 class="t-dsc-member-div t-dsc-member-nobold-div">
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<div><a href="cpp-io-basic_filebuf-basic_filebuf.html"><span class="t-lines"><span>(构造函数)</span></span></a></div>
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</td>
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<td>构造 basic_filebuf 对象<br />
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<span class="t-mark">(公开成员函数)</span></td>
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<div><a href="cpp-io-basic_filebuf-swap.html"><span class="t-lines"><span>swap</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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</div>
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</td>
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<td>交换二个 basic_filebuf 对象<br />
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<span class="t-mark">(公开成员函数)</span></td>
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