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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>ptr_fun</h1>
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<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-functional.html">functional</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code><a href="cpp-header-functional.html">&lt;functional&gt;</a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> Arg, <span class="kw1">class</span> Result <span class="sy1">&gt;</span><br /></span>
<p>std<span class="sy4">::</span><span class="me2">pointer_to_unary_function</span><span class="sy1">&lt;</span>Arg,Result<span class="sy1">&gt;</span><br /></p>
&nbsp; &nbsp; ptr_fun<span class="br0">(</span> Result <span class="br0">(</span><span class="sy2">*</span>f<span class="br0">)</span><span class="br0">(</span>Arg<span class="br0">)</span> <span class="br0">)</span><span class="sy4">;</span></div>
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<td><span class="t-mark">(C++11 &#20013;&#24323;&#29992;)</span><br />
<span class="t-mark-rev t-until-cxx17">(C++17 &#20013;&#31227;&#38500;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> Arg1, <span class="kw1">class</span> Arg2, <span class="kw1">class</span> Result <span class="sy1">&gt;</span><br /></span>
<p>std<span class="sy4">::</span><span class="me2">pointer_to_binary_function</span><span class="sy1">&lt;</span>Arg1,Arg2,Result<span class="sy1">&gt;</span><br /></p>
&nbsp; &nbsp; ptr_fun<span class="br0">(</span> Result <span class="br0">(</span><span class="sy2">*</span>f<span class="br0">)</span><span class="br0">(</span>Arg1, Arg2<span class="br0">)</span> <span class="br0">)</span><span class="sy4">;</span></div>
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<td><span class="t-mark">(C++11 &#20013;&#24323;&#29992;)</span><br />
<span class="t-mark-rev t-until-cxx17">(C++17 &#20013;&#31227;&#38500;)</span></td>
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<p>&#21019;&#24314;&#20989;&#25968;&#21253;&#35013;&#22120;&#23545;&#35937;&#65288; <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">pointer_to_unary_function</span></span></span> &#25110; <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">pointer_to_binary_function</span></span></span> &#65289;&#65292;&#20174;&#27169;&#26495;&#23454;&#21442;&#25512;&#23548;&#30446;&#26631;&#31867;&#22411;&#12290;</p>
<div class="t-li1"><span class="t-li">1)</span> &#31561;&#25928;&#22320;&#35843;&#29992; <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">pointer_to_unary_function</span><span class="sy1">&lt;</span>Arg,Result<span class="sy1">&gt;</span><span class="br0">(</span>f<span class="br0">)</span></span></span> &#12290;</div>
<div class="t-li1"><span class="t-li">2)</span> &#31561;&#25928;&#22320;&#35843;&#29992; <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">pointer_to_binary_function</span><span class="sy1">&lt;</span>Arg1,Arg2,Result<span class="sy1">&gt;</span><span class="br0">(</span>f<span class="br0">)</span></span></span> &#12290;</div>
<p>&#27492;&#20989;&#25968;&#19982;&#20851;&#32852;&#31867;&#22411;&#20174; C++11 &#36215;&#34987;&#24323;&#29992;&#65292;&#22240;&#20026;&#20351;&#29992;&#26356;&#36890;&#29992;&#30340; <span class="t-lc"><a href="cpp-utility-functional-function.html">std::function</a></span> &#21644; <span class="t-lc"><a href="cpp-utility-functional-ref.html">std::ref</a></span> &#26356;&#22909;&#65292;&#23427;&#20204;&#37117;&#21487;&#20197;&#20174;&#31616;&#21333;&#20989;&#25968;&#21019;&#24314;&#19982;&#36866;&#37197;&#22120;&#20860;&#23481;&#30340;&#20989;&#25968;&#23545;&#35937;&#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
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<td>f</td>
<td>-</td>
<td>&#20026;&#20043;&#21019;&#24314;&#21253;&#35013;&#30340;&#25351;&#21521;&#20989;&#25968;&#25351;&#38024;</td>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<p>&#21253;&#35013; <code>f</code> &#30340;&#20989;&#25968;&#23545;&#35937;&#12290;</p>
<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">&#24322;&#24120;</span></h3>
<p>&#21487;&#33021;&#25243;&#20986;&#23454;&#29616;&#23450;&#20041;&#30340;&#24322;&#24120;&#12290;</p>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
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<pre class="de1"><span class="co2">#include &lt;string&gt;</span>
<span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;algorithm&gt;</span>
<span class="co2">#include &lt;functional&gt;</span>
<span class="kw4">bool</span> isvowel<span class="br0">(</span><span class="kw4">char</span> c<span class="br0">)</span>
<span class="br0">{</span>
<span class="kw1">return</span> <a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a><span class="br0">(</span><span class="st0">&quot;aeoiuAEIOU&quot;</span><span class="br0">)</span>.<span class="me1">find</span><span class="br0">(</span>c<span class="br0">)</span> <span class="sy3">!</span><span class="sy1">=</span> <a href="cpp-string-basic_string-npos.html"><span class="kw1231">std::<span class="me2">string</span><span class="sy4">::</span><span class="me2">npos</span></span></a><span class="sy4">;</span>
<span class="br0">}</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a> s <span class="sy1">=</span> <span class="st0">&quot;Hello, world!&quot;</span><span class="sy4">;</span>
<a href="cpp-algorithm-copy.html"><span class="kw1583">std::<span class="me2">copy_if</span></span></a><span class="br0">(</span>s.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, s.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span>, <a href="cpp-iterator-ostreambuf_iterator.html"><span class="kw671">std::<span class="me2">ostreambuf_iterator</span></span></a><span class="sy1">&lt;</span><span class="kw4">char</span><span class="sy1">&gt;</span><span class="br0">(</span><a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a><span class="br0">)</span>,
<a href="cpp-utility-functional-not1.html"><span class="kw1050">std::<span class="me2">not1</span></span></a><span class="br0">(</span>std<span class="sy4">::</span><span class="me2">ptr_fun</span><span class="br0">(</span>isvowel<span class="br0">)</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<span class="co1">// C++11 &#26367;&#29992;&#26041;&#26696;&#65306;</span>
<span class="co1">// std::not1(std::cref(isvowel)));</span>
<span class="co1">// std::not1(std::function&lt;bool(char)&gt;(isvowel)));</span>
<span class="co1">// C++17 &#26367;&#29992;&#26041;&#26696;&#65306;</span>
<span class="co1">// std::not_fn(isvowel));</span>
<span class="br0">}</span></pre></div>
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<p>&#36755;&#20986;&#65306;</p>
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<pre class="de1">Hll, wrld!</pre></div>
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