114 lines
7.9 KiB
HTML
114 lines
7.9 KiB
HTML
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<title>std::operator<<(std::basic_stacktrace)</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_utility_basic_stacktrace_operator_ltlt 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>operator<<<small>(std::basic_stacktrace)</small></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-basic_stacktrace.html">basic stacktrace</a></span></div>
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<div>定义于头文件 <code><a href="cpp-header-stacktrace.html"><stacktrace></a></code></div>
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<td></td>
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<tr class="t-dcl t-since-cxx23">
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span> CharT, <span class="kw1">class</span> Traits, <span class="kw1">class</span> Allocator <span class="sy1">></span><br /></span>
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<p><a href="cpp-io-basic_ostream.html"><span class="kw1715">std::<span class="me2">basic_ostream</span></span></a><span class="sy1"><</span>CharT, Traits<span class="sy1">></span><span class="sy3">&</span> operator<span class="sy1"><<</span><span class="br0">(</span> <a href="cpp-io-basic_ostream.html"><span class="kw1715">std::<span class="me2">basic_ostream</span></span></a><span class="sy1"><</span>CharT, Traits<span class="sy1">></span><span class="sy3">&</span> os,<br /></p>
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<span class="kw4">const</span> std<span class="sy4">::</span><span class="me2">basic_stacktrace</span><span class="sy1"><</span>Allocator<span class="sy1">></span><span class="sy3">&</span> st <span class="br0">)</span><span class="sy4">;</span></div>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx23">(C++23 起)</span></td>
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<td></td>
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<td></td>
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<p>插入 <code>st</code> 的描述到输出流 <code>os</code> 中。等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw1">return</span> os <span class="sy1"><<</span> <a href="cpp-string-basic_string-to_string.html"><span class="kw1265">std::<span class="me2">to_string</span></span></a><span class="br0">(</span>st<span class="br0">)</span><span class="sy4">;</span></span></span> 。</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>os</td>
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<td>-</td>
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<td>输出流</td>
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<tr class="t-par">
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<td>st</td>
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<td>-</td>
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<td>要插入其描述的 <code>basic_stacktrace</code></td>
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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><code>os</code> 。</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>可能抛出实现定义的异常。</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>由于 <span class="t-lc"><a href="cpp-string-basic_string.html">std::string</a></span> 只能由 <span class="t-lc"><a href="cpp-io-basic_ostream.html">std::ostream</a></span> 输出（例如不能由 <span class="t-lc"><a href="cpp-io-basic_ostream.html">std::wostream</a></span> ），这等效地要求 <code>os</code> 的类型为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-io-basic_ostream.html"><span class="kw1729">std::<span class="me2">ostream</span></span></a><span class="sy3">&</span></span></span> 。</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 <stacktrace></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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<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"The stacktrace obtained in the main function:<span class="es1">\n</span>"</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> std<span class="sy4">::</span><span class="me2">stacktrace</span><span class="sy4">::</span><span class="me2">current</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="br0">[</span><span class="br0">]</span><span class="br0">{</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">"The stacktrace obtained in a nested lambda:<span class="es1">\n</span>"</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> std<span class="sy4">::</span><span class="me2">stacktrace</span><span class="sy4">::</span><span class="me2">current</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="br0">}</span><span class="br0">(</span><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>可能的输出：</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">The stacktrace obtained in the main function:
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0# 0x0000000000402E7B in ./prog.exe
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1# __libc_start_main in /lib/x86_64-linux-gnu/libc.so.6
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2# 0x0000000000402CD9 in ./prog.exe
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The stacktrace obtained in a nested lambda:
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0# 0x0000000000402DDA in ./prog.exe
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1# 0x0000000000402EB2 in ./prog.exe
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2# __libc_start_main in /lib/x86_64-linux-gnu/libc.so.6
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3# 0x0000000000402CD9 in ./prog.exe</pre></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-utility-stacktrace_entry-operator_ltlt.html"><span class="t-lines"><span>operator<<</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx23">(C++23)</span></span></span></div>
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</div>
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</td>
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<td>进行 <code>stacktrace_entry</code> 的流输出<br />
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<span class="t-mark">(函数模板)</span></td>
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