127 lines
8.8 KiB
HTML
127 lines
8.8 KiB
HTML
<!DOCTYPE html>
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<title>std::rethrow_exception</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_error_rethrow_exception 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>rethrow_exception</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 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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<td>
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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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<td></td>
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<td></td>
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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> rethrow_exception<span class="br0">(</span> <a href="cpp-error-exception_ptr.html"><span class="kw776">std::<span class="me2">exception_ptr</span></span></a> p <span class="br0">)</span><span class="sy4">;</span></span></div>
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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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<td></td>
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<td></td>
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<td></td>
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</tbody>
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<p>抛出异常指针 <code>p</code> 所引用的先前捕获的异常对象，或其副本。</p>
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<p>是否创建副本是未指定的。若创建副本，则以未指定的方式分配其存储。</p>
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<p>若 <code>p</code> 为空则行为未定义。</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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<td>p</td>
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<td>-</td>
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<td>非空 <span class="t-lc"><a href="cpp-error-exception_ptr.html">std::exception_ptr</a></span></td>
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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=".E5.BC.82.E5.B8.B8">异常</span></h3>
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<p>若不创建副本，则为 <code>p</code> 所引用的异常对象。</p>
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<p>否则，若实现成功复制异常对象，则为这种异常对象的副本。</p>
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<p>否则，若分配或复制失败，则分别为 <span class="t-lc"><a href="cpp-memory-new-bad_alloc.html">std::bad_alloc</a></span> 或复制异常对象时抛出的异常。</p>
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<h3><span class="mw-headline" id=".E6.B3.A8.E8.A7.A3">注解</span></h3>
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<p>在 <a rel="nofollow" class="external text" href="https://wg21.link/P1675R2">P1675R2</a> 前， <code>rethrow_exception</code> 未被允许复制异常对象，这在一些异常对象分配在栈上的平台上无法实现。</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-template-editlink" style=""></div>
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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="co2">#include <string></span>
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<span class="co2">#include <exception></span>
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<span class="co2">#include <stdexcept></span>
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<span class="kw4">void</span> handle_eptr<span class="br0">(</span><a href="cpp-error-exception_ptr.html"><span class="kw776">std::<span class="me2">exception_ptr</span></span></a> eptr<span class="br0">)</span> <span class="co1">// 按值传递 ok</span>
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<span class="br0">{</span>
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<span class="kw1">try</span> <span class="br0">{</span>
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<span class="kw1">if</span> <span class="br0">(</span>eptr<span class="br0">)</span> <span class="br0">{</span>
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std<span class="sy4">::</span><span class="me2">rethrow_exception</span><span class="br0">(</span>eptr<span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span>
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<span class="br0">}</span> <span class="kw1">catch</span><span class="br0">(</span><span class="kw4">const</span> <a href="cpp-error-exception.html"><span class="kw764">std::<span class="me2">exception</span></span></a><span class="sy3">&</span> e<span class="br0">)</span> <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">"Caught exception <span class="es1">\"</span>"</span> <span class="sy1"><<</span> e.<span class="me1">what</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1"><<</span> <span class="st0">"<span class="es1">\"</span><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>
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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-error-exception_ptr.html"><span class="kw776">std::<span class="me2">exception_ptr</span></span></a> eptr<span class="sy4">;</span>
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<span class="kw1">try</span> <span class="br0">{</span>
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<a href="cpp-string-basic_string.html"><span class="kw1229">std::<span class="me2">string</span></span></a><span class="br0">(</span><span class="br0">)</span>.<span class="me1">at</span><span class="br0">(</span><span class="nu0">1</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 这生成一个 std::out_of_range</span>
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<span class="br0">}</span> <span class="kw1">catch</span><span class="br0">(</span>...<span class="br0">)</span> <span class="br0">{</span>
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eptr <span class="sy1">=</span> <a href="cpp-error-current_exception.html"><span class="kw778">std::<span class="me2">current_exception</span></span></a><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 捕获</span>
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<span class="br0">}</span>
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handle_eptr<span class="br0">(</span>eptr<span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span> <span class="co1">// std::out_of_range 的析构函数调用于此，在 ept 析构时</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">Caught exception "basic_string::at"</pre></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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<div class="t-dsc-member-div">
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<div><a href="cpp-error-exception_ptr.html"><span class="t-lines"><span>exception_ptr</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>用于处理异常对象的共享指针类型<br />
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<span class="t-mark">(typedef)</span></td>
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<tr class="t-dsc">
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<div class="t-dsc-member-div">
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<div><a href="cpp-error-current_exception.html"><span class="t-lines"><span>current_exception</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>捕获当前异常到 <span class="t-lc"><a href="cpp-error-exception_ptr.html">std::exception_ptr</a></span> 之中<br />
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<span class="t-mark">(函数)</span></td>
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</table>
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</div>
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<div class="visualClear"></div>
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