168 lines
9.2 KiB
HTML
168 lines
9.2 KiB
HTML
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<title>std::experimental::source_location</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_experimental_source_location 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::experimental::</span>source_location</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-experimental.html">experimental</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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<div>定义于头文件 <code><a href="https://zh.cppreference.com/mwiki/index.php?title=cpp/header/experimental/source_location&action=edit&redlink=1" class="new" title="cpp/header/experimental/source location（页面不存在）"><experimental/source_location></a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">struct</span> source_location<span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-libfund-ts-2 t-mark-ts">(库基础 TS v2)</span></td>
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<p><code>source_location</code> 类表示关于源码的某些信息，例如文件名、行号和函数名。之前，欲获得关于调用点的此信息（为了记录、测试或调试的目的）的函数必须用宏将如 <span class="t-lc">__LINE__</span> 和 <span class="t-lc">__FILE__</span> 的预定义宏展开于调用方的环境。 <code>source_location</code> 类提供一个更好的替用品。</p>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">成员函数</span></h3>
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<h5><span class="mw-headline" id=".E5.88.9B.E5.BB.BA">创建</span></h5>
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<div><a href="cpp-experimental-source_location-source_location.html"><span class="t-lines"><span>(构造函数)</span></span></a></div>
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</td>
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<td>创建拥有实现定义值的新 <code>source_location</code><br />
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<span class="t-mark">(公开成员函数)</span></td>
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<div><a href="cpp-experimental-source_location-current.html"><span class="t-lines"><span>current</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-cmark">[静态]</span></span></span></div>
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</div>
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</td>
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<td>创建新的 <code>source_location</code><br />
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<span class="t-mark">(公开静态成员函数)</span></td>
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<h5><span class="mw-headline" id=".E5.85.B6.E4.BB.96.E7.89.B9.E6.AE.8A.E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">其他特殊成员函数</span></h5>
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<div><span class="t-lines"><span>(析构函数)</span></span></div>
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<div><span class="t-lines"><span><span class="t-mark">(隐式声明)</span></span></span></div>
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</td>
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<td>析构 <code>source_location</code><br />
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<span class="t-mark">(公开成员函数)</span></td>
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<div><span class="t-lines"><span>operator=</span></span></div>
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<div><span class="t-lines"><span><span class="t-mark">(隐式声明)</span></span></span></div>
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</td>
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<td>隐式声明的复制/移动赋值运算符<br />
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<span class="t-mark">(公开成员函数)</span></td>
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<h5><span class="mw-headline" id=".E5.9F.9F.E8.AE.BF.E9.97.AE">域访问</span></h5>
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<div><a href="cpp-experimental-source_location-line.html"><span class="t-lines"><span>line</span></span></a></div>
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</td>
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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">(公开成员函数)</span></td>
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<tr class="t-dsc">
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<div><a href="cpp-experimental-source_location-column.html"><span class="t-lines"><span>column</span></span></a></div>
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<td>返回此对象所表示的列号<br />
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<span class="t-mark">(公开成员函数)</span></td>
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<div><a href="cpp-experimental-source_location-file_name.html"><span class="t-lines"><span>file_name</span></span></a></div>
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</div>
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</td>
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<td>返回此对象所表示的文件名<br />
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<span class="t-mark">(公开成员函数)</span></td>
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<div><a href="cpp-experimental-source_location-function_name.html"><span class="t-lines"><span>function_name</span></span></a></div>
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</div>
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</td>
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<td>返回此对象所表示的函数名，若它存在<br />
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<span class="t-mark">(公开成员函数)</span></td>
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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="co2">#include <string_view></span>
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<span class="co2">#include <experimental/source_location></span>
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<span class="kw4">void</span> log<span class="br0">(</span><span class="kw4">const</span> <a href="cpp-string-basic_string_view.html"><span class="kw1248">std::<span class="me2">string_view</span></span></a><span class="sy3">&</span> message, <span class="kw4">const</span> std<span class="sy4">::</span><span class="me2">experimental</span><span class="sy4">::</span><span class="me2">source_location</span><span class="sy3">&</span> location <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">experimental</span><span class="sy4">::</span><span class="me2">source_location</span><span class="sy4">::</span><span class="me2">current</span><span class="br0">(</span><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">"info:"</span>
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<span class="sy1"><<</span> location.<span class="me1">file_name</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1"><<</span> <span class="st0">":"</span>
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<span class="sy1"><<</span> location.<span class="me1">line</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1"><<</span> <span class="st0">" "</span>
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<span class="sy1"><<</span> message <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>
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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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log<span class="br0">(</span><span class="st0">"Hello world!"</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">info:main.cpp:15 Hello world!</pre></div>
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