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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::source_location::</span>function_name</h1>
<div id="bodyContent">
<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-utility.html">utility</a>&lrm; | <a href="cpp-utility-source_location.html">source location</a></span></div>
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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><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></td>
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<p>&#36820;&#22238;&#19982;&#27492;&#23545;&#35937;&#25152;&#34920;&#31034;&#30340;&#20301;&#32622;&#20851;&#32852;&#30340;&#20989;&#25968;&#21517;&#65292;&#33509;&#23384;&#22312;&#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
<p>&#65288;&#26080;&#65289;</p>
<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<p>&#33509;&#27492;&#23545;&#35937;&#34920;&#31034;&#20989;&#25968;&#20307;&#20869;&#30340;&#20301;&#32622;&#65292;&#21017;&#36820;&#22238;&#23545;&#24212;&#20989;&#25968;&#21517;&#30340;&#23454;&#29616;&#23450;&#20041;&#30340;&#31354;&#32456;&#27490;&#23383;&#33410;&#23383;&#31526;&#20018;&#12290;</p>
<p>&#21542;&#21017;&#65292;&#36820;&#22238;&#31354;&#23383;&#31526;&#20018;&#12290;</p>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
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<p>&#20197;&#19979;&#31034;&#20363;&#23637;&#31034;&#33021;&#22914;&#20309;&#29992; <code>std::source_location::function_name()</code> &#25171;&#21360;&#20989;&#25968;&#12289;&#26500;&#36896;&#20989;&#25968;&#12289;&#26512;&#26500;&#20989;&#25968;&#25110;&#37325;&#36733;&#30340; <code>operator()</code> &#30340;&#21517;&#23383;&#12290;</p>
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<pre class="de1"><span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;string_view&gt;</span>
<span class="co2">#include &lt;source_location&gt;</span>
<span class="kw1">inline</span> <span class="kw4">void</span> function_name<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> signature <span class="sy1">=</span> <span class="st0">&quot;()&quot;</span>,
<span class="kw4">const</span> std<span class="sy4">::</span><span class="me2">source_location</span><span class="sy3">&amp;</span> location <span class="sy1">=</span> std<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>
<span class="br0">{</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> location.<span class="me1">function_name</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// &lt;- &#35843;&#29992;&#26041;&#20043;&#21517;&#65281;</span>
<span class="kw1">if</span> <span class="br0">(</span><span class="sy3">!</span>signature.<span class="me1">empty</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> signature<span class="sy4">;</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span>
<span class="br0">}</span>
<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>
<span class="kw1">struct</span> S <span class="br0">{</span>
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>
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">&quot;(int)&quot;</span><span class="br0">)</span><span class="sy4">;</span> <span class="br0">}</span>
S<span class="sy3">&amp;</span> operator<span class="sy1">=</span><span class="br0">(</span>S <span class="kw4">const</span><span class="sy3">&amp;</span><span class="br0">)</span> <span class="br0">{</span> function_name<span class="br0">(</span><span class="st0">&quot;(const S&amp;)&quot;</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>
S<span class="sy3">&amp;</span> operator<span class="sy1">=</span><span class="br0">(</span>S<span class="sy3">&amp;&amp;</span><span class="br0">)</span> <span class="br0">{</span> function_name<span class="br0">(</span><span class="st0">&quot;(S&amp;&amp;)&quot;</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>
~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>
<span class="br0">}</span><span class="sy4">;</span>
<span class="kw4">auto</span> main<span class="br0">(</span><span class="br0">)</span> <span class="sy2">-</span><span class="sy1">&gt;</span> <span class="kw4">int</span>
<span class="br0">{</span>
foo<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
S p<span class="sy4">;</span>
S q<span class="br0">{</span><span class="nu0">42</span><span class="br0">}</span><span class="sy4">;</span>
p <span class="sy1">=</span> q<span class="sy4">;</span>
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>
<span class="br0">}</span></pre></div>
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<p>&#36755;&#20986;&#65306;</p>
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<div class="text source-text">
<pre class="de1">foo()
S()
S(int)
operator=(const S&amp;)
operator=(S&amp;&amp;)
~S()
~S()</pre></div>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">&#21442;&#38405;</span></h3>
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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>&#36820;&#22238;&#27492;&#23545;&#35937;&#25152;&#34920;&#31034;&#30340;&#34892;&#21495;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-utility-source_location-column.html"><span class="t-lines"><span>column</span></span></a></div>
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<td>&#36820;&#22238;&#27492;&#23545;&#35937;&#25152;&#34920;&#31034;&#30340;&#21015;&#21495;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-utility-source_location-file_name.html"><span class="t-lines"><span>file_name</span></span></a></div>
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<td>&#36820;&#22238;&#27492;&#23545;&#35937;&#25152;&#34920;&#31034;&#30340;&#25991;&#20214;&#21517;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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