133 lines
8.7 KiB
HTML
133 lines
8.7 KiB
HTML
<!DOCTYPE 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::_Exit</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_utility_program_Exit skin-cppreference2 action-view cpp-navbar">
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<div id="cpp-content-base">
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<div id="content"><a id="top"></a>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>_Exit</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-utility.html">utility</a>‎ | <a href="cpp-utility-program.html">program</a></span></div>
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<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
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<table class="t-dcl-begin">
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<tbody>
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<td>
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<div>定义于头文件 <code><a href="cpp-header-cstdlib.html"><cstdlib></a></code></div>
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</td>
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<td></td>
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<td></td>
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<tr class="t-dcl t-since-cxx11">
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<div><span class="mw-geshi cpp source-cpp"><span class="br0">[</span><span class="br0">[</span>noreturn<span class="br0">]</span><span class="br0">]</span> <span class="kw4">void</span> _Exit<span class="br0">(</span> <span class="kw4">int</span> exit_code <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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</td>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<tr class="t-dcl-sep">
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<td></td>
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<td></td>
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<td></td>
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<p>导致正常程序终止出现，而不清理资源。</p>
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<p>不调用拥有自动、线程局域和静态存储期对象的析构函数。不调用传递给 <span class="t-lc"><a href="cpp-utility-program-at_quick_exit.html">std::at_quick_exit()</a></span> 或 <span class="t-lc"><a href="cpp-utility-program-atexit.html">std::atexit()</a></span> 的函数。是否关闭打开的资源，例如文件，是实现定义的。</p>
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<p>若 <code>exit_code</code> 为 <span class="t-lc">0</span> 或 <span class="t-lc"><a href="cpp-utility-program-EXIT_status.html">EXIT_SUCCESS</a></span> ，则返回宿主环境指示成功终止的实现定义状态。若 <code>exit_code</code> 为 <span class="t-lc"><a href="cpp-utility-program-EXIT_status.html">EXIT_FAILURE</a></span> ，则返回指示<i>不成功</i>终止的实现定义状态。其他情况下返回实现定义状态值。</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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<table class="t-par-begin">
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<tr class="t-par">
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<td>exit_code</td>
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<td>-</td>
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<td>程序的退出状态</td>
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</tr>
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</table>
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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>（无）</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="t-example">
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<div class="t-example-live-link"></div>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="cpp source-cpp">
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<pre class="de1"><span class="co2">#include <iostream></span>
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<span class="kw1">class</span> Static <span class="br0">{</span>
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<span class="kw1">public</span><span class="sy4">:</span>
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~Static<span class="br0">(</span><span class="br0">)</span>
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<span class="br0">{</span>
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<a href="cpp-io-cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"Static dtor<span class="es1">\n</span>"</span><span class="sy4">;</span>
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<span class="br0">}</span>
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<span class="br0">}</span><span class="sy4">;</span>
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<span class="kw1">class</span> Local <span class="br0">{</span>
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<span class="kw1">public</span><span class="sy4">:</span>
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~Local<span class="br0">(</span><span class="br0">)</span>
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<span class="br0">{</span>
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<a href="cpp-io-cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"Local dtor<span class="es1">\n</span>"</span><span class="sy4">;</span>
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<span class="br0">}</span>
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<span class="br0">}</span><span class="sy4">;</span>
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Static static_variable<span class="sy4">;</span> <span class="co1">// 此对象的析构函数将*不*被调用</span>
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<span class="kw4">void</span> atexit_handler<span class="br0">(</span><span class="br0">)</span>
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<span class="br0">{</span>
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<a href="cpp-io-cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"atexit handler<span class="es1">\n</span>"</span><span class="sy4">;</span>
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<span class="br0">}</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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Local local_variable<span class="sy4">;</span> <span class="co1">// 将*不*调用析构函数</span>
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<span class="co1">// 将*不*调用处理函数</span>
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<span class="kw4">const</span> <span class="kw4">int</span> result <span class="sy1">=</span> <a href="cpp-utility-program-atexit.html"><span class="kw969">std::<span class="me2">atexit</span></span></a><span class="br0">(</span>atexit_handler<span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">if</span> <span class="br0">(</span>result <span class="sy3">!</span><span class="sy1">=</span> <span class="nu0">0</span><span class="br0">)</span> <span class="br0">{</span>
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<a href="cpp-io-cerr.html"><span class="kw1759">std::<span class="me2">cerr</span></span></a> <span class="sy1"><<</span> <span class="st0">"atexit registration failed<span class="es1">\n</span>"</span><span class="sy4">;</span>
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<span class="kw1">return</span> <a href="cpp-utility-program-EXIT_status.html"><span class="kw972">EXIT_FAILURE</span></a><span class="sy4">;</span>
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<span class="br0">}</span>
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<a href="cpp-io-cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"test"</span> <span class="sy1"><<</span> <a href="cpp-io-manip-endl.html"><span class="kw1790">std::<span class="me2">endl</span></span></a><span class="sy4">;</span> <span class="co1">// 从 std::endl 冲入</span>
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<span class="co1">// 需要再次，否则不会打印内容</span>
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std<span class="sy4">::</span>_Exit<span class="br0">(</span><a href="cpp-utility-program-EXIT_status.html"><span class="kw972">EXIT_FAILURE</span></a><span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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</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">test</pre></div>
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</div>
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</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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<table class="t-dsc-begin">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-utility-program-abort.html"><span class="t-lines"><span>abort</span></span></a></div>
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</div>
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</td>
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<td>导致非正常的程序终止（不进行清理）<br />
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<span class="t-mark">(函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-utility-program-exit.html"><span class="t-lines"><span>exit</span></span></a></div>
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</div>
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</td>
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<td>导致正常的程序终止并进行清理<br />
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<span class="t-mark">(函数)</span></td>
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</tr>
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</table>
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</div>
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<div class="visualClear"></div>
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</div>
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