73 lines
4.8 KiB
HTML
73 lines
4.8 KiB
HTML
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<html lang="zh" dir="ltr" class="client-nojs" xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh">
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<title>std::basic_istream<CharT,Traits>::~basic_istream</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_io_basic_istream_basic_istream 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_istream<CharT,Traits>::</span>~basic_istream</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_istream.html">basic istream</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">virtual</span> ~basic_istream<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span></span></div>
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<p>析构输入流。</p>
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<h3><span class="mw-headline" id=".E6.B3.A8.E6.84.8F">注意</span></h3>
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<p>此析构函数不在底层流缓冲（ <code>rdbuf()</code> ）上进行任何操作：导出输入流，如 <span class="t-lc"><a href="cpp-io-basic_ifstream.html">std::basic_ifstream</a></span> 和 <span class="t-lc"><a href="cpp-io-basic_istringstream.html">std::basic_istringstream</a></span> 的析构函数负责调用流缓冲的析构函数。</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 <sstream></span>
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<span class="co2">#include <iostream></span>
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<span class="kw4">void</span> print_stringbuf<span class="br0">(</span><a href="cpp-io-basic_streambuf.html"><span class="kw1724">std::<span class="me2">streambuf</span></span></a><span class="sy2">*</span> p<span class="br0">)</span>
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<span class="br0">{</span>
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<a href="cpp-io-basic_istream.html"><span class="kw1727">std::<span class="me2">istream</span></span></a> buf<span class="br0">(</span>p<span class="br0">)</span><span class="sy4">;</span> <span class="co1">// buf 与 s1 共享缓冲</span>
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<span class="kw4">int</span> n<span class="sy4">;</span>
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buf <span class="sy1">>></span> n<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> n<span class="sy4">;</span>
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<span class="br0">}</span> <span class="co1">// 调用 buf 的析构函数。 p 保持不受影响</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_istringstream.html"><span class="kw1735">std::<span class="me2">istringstream</span></span></a> s1<span class="br0">(</span><span class="st0">"10 20"</span><span class="br0">)</span><span class="sy4">;</span>
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print_stringbuf<span class="br0">(</span>s1.<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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<span class="kw4">int</span> n<span class="sy4">;</span>
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s1 <span class="sy1">>></span> n<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> <span class="st0">','</span> <span class="sy1"><<</span> n <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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<p>输出：</p>
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<div class="text source-text">
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<pre class="de1">10,20</pre></div>
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