127 lines
8.8 KiB
HTML
127 lines
8.8 KiB
HTML
<!DOCTYPE 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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<head><meta http-equiv="x-ua-compatible" content="ie=edge">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<title>std::experimental::source_location::function_name</title>
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<link rel="stylesheet" href="ext.css" />
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<link rel="stylesheet" href="site_modules.css" />
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</head>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_experimental_source_location_function_name skin-cppreference2 action-view cpp-navbar">
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<div id="cpp-content-base">
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<div id="content"><a id="top"></a>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::experimental::source_location::</span>function_name</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>‎ | <a href="cpp-experimental-source_location.html">source location</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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<tbody>
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<tr class="t-dcl t-since-libfund_ts_2">
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<td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> <span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> function_name<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</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-libfund-ts-2 t-mark-ts">(库基础 TS v2)</span></td>
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</tr>
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<tr class="t-dcl-sep">
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<td></td>
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<td></td>
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<td></td>
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</tr>
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</tbody>
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</table>
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<p>返回与此对象所表示的位置关联的函数名，若它存在。</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>若此对象表示函数体中的位置，则返回对应该函数名的实现定义的空终止字节字符串。</p>
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<p>否则，返回空字符串。</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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<p>以下示例展示可以如何用 <code>std::source_location::function_name()</code> 打印函数、构造函数、析构函数或重载的 <code>operator()</code> 的名字。</p>
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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 <experimental/source_location></span>
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<span class="co2">#include <iostream></span>
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<span class="co2">#include <string_view></span>
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<span class="kw1">inline</span> <span class="kw4">void</span> function_name<span class="br0">(</span>
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<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> signature <span class="sy1">=</span> <span class="st0">"()"</span>,
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<span class="kw4">const</span> <a href="cpp-experimental-source_location.html"><span class="kw2431">std::<span class="me2">experimental</span><span class="sy4">::</span><span class="me2">source_location</span></span></a><span class="sy3">&</span> location
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<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>
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<span class="sy1"><<</span> location.<span class="me1">function_name</span><span class="br0">(</span><span class="br0">)</span> <span class="co1">// <- 调用方的名字！</span>
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<span class="sy1"><<</span> signature
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<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">void</span> foo<span class="br0">(</span><span class="br0">)</span> <span class="br0">{</span> function_name<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="br0">}</span>
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<span class="kw1">struct</span> S <span class="br0">{</span>
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S<span class="br0">(</span><span class="br0">)</span> <span class="br0">{</span> function_name<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="br0">}</span>
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S<span class="br0">(</span><span class="kw4">int</span><span class="br0">)</span> <span class="br0">{</span> function_name<span class="br0">(</span><span class="st0">"(int)"</span><span class="br0">)</span><span class="sy4">;</span> <span class="br0">}</span>
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S<span class="sy3">&</span> operator<span class="sy1">=</span><span class="br0">(</span>S <span class="kw4">const</span><span class="sy3">&</span><span class="br0">)</span> <span class="br0">{</span> function_name<span class="br0">(</span><span class="st0">"(const S&)"</span><span class="br0">)</span><span class="sy4">;</span> <span class="kw1">return</span> <span class="sy2">*</span>this<span class="sy4">;</span> <span class="br0">}</span>
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S<span class="sy3">&</span> operator<span class="sy1">=</span><span class="br0">(</span>S<span class="sy3">&&</span><span class="br0">)</span> <span class="br0">{</span> function_name<span class="br0">(</span><span class="st0">"(S&&)"</span><span class="br0">)</span><span class="sy4">;</span> <span class="kw1">return</span> <span class="sy2">*</span>this<span class="sy4">;</span> <span class="br0">}</span>
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~S<span class="br0">(</span><span class="br0">)</span> <span class="br0">{</span> function_name<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="br0">}</span>
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<span class="br0">}</span><span class="sy4">;</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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foo<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
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S p<span class="sy4">;</span>
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S q<span class="br0">{</span><span class="nu0">42</span><span class="br0">}</span><span class="sy4">;</span>
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p <span class="sy1">=</span> q<span class="sy4">;</span>
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p <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>q<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">foo()
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S()
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S(int)
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operator=(const S&)
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operator=(S&&)
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~S()
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~S()</pre></div>
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</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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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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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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</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>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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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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</div>
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</td>
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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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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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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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</tr>
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</table>
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</div>
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<div class="visualClear"></div>
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</div>
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</div>
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</div>
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</body>
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</html>
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