76 lines
4.9 KiB
HTML
76 lines
4.9 KiB
HTML
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<title>std::ostrstream::~ostrstream</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_io_ostrstream_ostrstream 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::ostrstream::</span>~ostrstream</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-ostrstream.html">ostrstream</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">virtual</span> ~ostrstream<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span></span></div>
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<p>销毁 <code>std::ostrstream</code> 对象，这亦销毁成员 <span class="t-lc"><a href="cpp-io-strstreambuf.html">std::strstreambuf</a></span> ，而可能调用解分配函数，若底层缓冲区为动态分配且不被冻结。</p>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
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<p>（无）</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>若在动态流上调用 <span class="t-lc"><a href="cpp-io-ostrstream-str.html">str()</a></span> 而未在之后调用 <a href="cpp-io-ostrstream-freeze.html">freeze(false)</a> ，则此析构函数泄露内存。</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 <strstream></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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<span class="br0">{</span>
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<a href="cpp-io-ostrstream.html"><span class="kw1754">std::<span class="me2">ostrstream</span></span></a> s<span class="sy4">;</span> <span class="co1">// 动态缓冲区</span>
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s <span class="sy1"><<</span> <span class="nu16">1.23</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="me1">str</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>
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s.<span class="me1">freeze</span><span class="br0">(</span><span class="kw2">false</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span> <span class="co1">// 调用析构函数，解分配缓冲区</span>
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<span class="br0">{</span>
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<a href="cpp-io-ostrstream.html"><span class="kw1754">std::<span class="me2">ostrstream</span></span></a> s<span class="sy4">;</span>
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s <span class="sy1"><<</span> <span class="nu16">1.23</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="me1">str</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>
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<span class="co1">// buf.freeze(false);</span>
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<span class="br0">}</span> <span class="co1">// 调用析构函数，内存泄露</span>
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<span class="br0">}</span></pre></div>
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<p>输出：</p>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="text source-text">
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<pre class="de1">1.23
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1.23</pre></div>
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