87 lines
6.4 KiB
HTML
87 lines
6.4 KiB
HTML
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<title>std::unexpected_handler</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_error_unexpected_handler 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::</span>unexpected_handler</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-error.html">error</a></span></div>
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<div>定义于头文件 <code><a href="cpp-header-exception.html"><exception></a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">typedef</span> <span class="kw4">void</span> <span class="br0">(</span><span class="sy2">*</span>unexpected_handler<span class="br0">)</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark">(C++11 中弃用)</span><br />
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<span class="t-mark-rev t-until-cxx17">(C++17 中移除)</span></td>
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<p><code>std::unexpected_handler</code> 是函数指针类型（指向不接收参数并返回 void 的函数），它为函数 <span class="t-lc"><a href="cpp-error-set_unexpected.html">std::set_unexpected</a></span> 所安装，为 <span class="t-lc"><a href="cpp-error-get_unexpected.html">std::get_unexpected</a></span> 所查询，并为 <span class="t-lc"><a href="cpp-error-unexpected.html">std::unexpected</a></span> 所调用。</p>
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<p>C++ 实现提供默认的 <code>std::unexpected_handler</code> 函数，它调用 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-error-terminate.html"><span class="kw783">std::<span class="me2">terminate</span></span></a><span class="br0">(</span><span class="br0">)</span></span></span> 。若安装空指针值（用 <span class="t-lc"><a href="cpp-error-set_unexpected.html">std::set_unexpected</a></span> ），则实现可以替代地恢复默认处理函数。</p>
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<p>期待用户定义的 <code>std::unexpected_handler</code> 终止程序或抛出异常。若它抛出异常，则可能遇到下列三种情况之一：</p>
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<p>1) <code>std::unexpected_handler</code> 所抛的异常满足之前被违背的动态异常规定。则允许新异常逃出函数并继续栈回溯。</p>
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<p>2) <code>std::unexpected_handler</code> 所抛的异常仍然违背动态异常规定：</p>
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<p>2a) 然而，异常规定允许 <span class="t-lc"><a href="cpp-error-bad_exception.html">std::bad_exception</a></span> ： C++ 运行时销毁抛出的异常对象，并构造 <span class="t-lc"><a href="cpp-error-bad_exception.html">std::bad_exception</a></span> 替代地抛出。</p>
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<p>2b) 异常规定不允许 <span class="t-lc"><a href="cpp-error-bad_exception.html">std::bad_exception</a></span> ：调用 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-error-terminate.html"><span class="kw783">std::<span class="me2">terminate</span></span></a><span class="br0">(</span><span class="br0">)</span></span></span> 。</p>
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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">
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<div><a href="cpp-error-unexpected.html"><span class="t-lines"><span>unexpected</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-until-cxx17">(C++17 中移除)</span></span></span></div>
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</div>
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</td>
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<td>违背动态异常说明时调用的函数<br />
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<span class="t-mark">(函数)</span></td>
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<div><a href="cpp-error-set_unexpected.html"><span class="t-lines"><span>set_unexpected</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-until-cxx17">(C++17 中移除)</span></span></span></div>
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</div>
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</td>
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<td>更改要被 <span class="t-lc"><a href="cpp-error-unexpected.html">std::unexpected</a></span> 调用的函数<br />
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<span class="t-mark">(函数)</span></td>
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<div><a href="cpp-error-get_unexpected.html"><span class="t-lines"><span>get_unexpected</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 class="t-mark-rev t-until-cxx17">(C++17 中移除)</span></span></span></div>
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</div>
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</td>
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<td>获得当前的 unexpected_handler<br />
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<span class="t-mark">(函数)</span></td>
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