77 lines
5.4 KiB
HTML
77 lines
5.4 KiB
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::stacktrace_entry::source_line</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_utility_stacktrace_entry_source_line 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::stacktrace_entry::</span>source_line</h1>
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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-stacktrace_entry.html">stacktrace entry</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><a href="cpp-types-integer.html"><span class="kw130">std::<span class="me2">uint_least32_t</span></span></a> source_line<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</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-cxx23">(C++23 起)</span></td>
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<td></td>
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<p>成功时返回 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span> 所表示的求值相关的基于 1 的行号，或在分配失败以外的失败时，例如当 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span> 为空返回 0 。</p>
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<p>要么 <a href="cpp-utility-stacktrace_entry-source_file.html"><code>source_file</code></a> 返回预设源文件名且 <code>source_line</code> 返回预设行号，要么 <a href="cpp-utility-stacktrace_entry-source_file.html"><code>source_file</code></a> 返回实际源文件名且 <code>source_line</code> 返回实际行号。</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=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
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<p>成功时为指定如上的行号，分配失败以外的失败时为 0 。</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>若不能分配内部数据结构的内存则抛出 <span class="t-lc"><a href="cpp-memory-new-bad_alloc.html">std::bad_alloc</a></span> 。</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>预设行号是预定义宏 <a href="cpp-preprocessor-replace.html"><tt>__LINE__</tt></a> 所展开的结果，并且能由 <a href="cpp-preprocessor-line.html"><tt>#line</tt></a> 指令更改。</p>
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<td class="mbox-empty-cell"></td>
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<td class="mbox-text" style="">本节未完成<br />
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原因：“实际行号”的定义缺失（ <a rel="nofollow" class="external text" href="https://cplusplus.github.io/LWG/issue3507">LWG 问题 3507</a> ）</td>
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<p>不要求此函数为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw1">noexcept</span></span></span> ，因为在某些平台上获取源行号要求分配。</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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<td class="mbox-text" style="">本节未完成<br />
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原因：暂无示例</td>
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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-utility-source_location-line.html"><span class="t-lines"><span>line</span></span></a></div>
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<td>返回此对象所表示的行号<br />
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<span class="t-mark">(<code>std::source_location</code> 的公开成员函数)</span></td>
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