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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>make_pair</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-pair.html">pair</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code><a href="cpp-header-utility.html">&lt;utility&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> T1, <span class="kw1">class</span> T2 <span class="sy1">&gt;</span><br />
<a href="cpp-utility-pair.html"><span class="kw1096">std::<span class="me2">pair</span></span></a><span class="sy1">&lt;</span>T1,T2<span class="sy1">&gt;</span> make_pair<span class="br0">(</span> T1 t, T2 u <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-until-cxx11">(C++11 &#21069;)</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> T1, <span class="kw1">class</span> T2 <span class="sy1">&gt;</span><br />
<a href="cpp-utility-pair.html"><span class="kw1096">std::<span class="me2">pair</span></span></a><span class="sy1">&lt;</span>V1,V2<span class="sy1">&gt;</span> make_pair<span class="br0">(</span> T1<span class="sy3">&amp;&amp;</span> t, T2<span class="sy3">&amp;&amp;</span> u <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span><br />
<span class="t-mark-rev t-until-cxx14">(C++14 &#21069;)</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> T1, <span class="kw1">class</span> T2 <span class="sy1">&gt;</span><br />
<span class="kw4">constexpr</span> <a href="cpp-utility-pair.html"><span class="kw1096">std::<span class="me2">pair</span></span></a><span class="sy1">&lt;</span>V1,V2<span class="sy1">&gt;</span> make_pair<span class="br0">(</span> T1<span class="sy3">&amp;&amp;</span> t, T2<span class="sy3">&amp;&amp;</span> u <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx14">(C++14 &#36215;)</span></td>
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<p>&#26500;&#36896; <span class="t-lc"><a href="cpp-utility-pair.html">std::pair</a></span> &#23545;&#35937;&#65292;&#20174;&#21442;&#25968;&#31867;&#22411;&#25512;&#23548;&#30446;&#26631;&#31867;&#22411;&#12290;</p>
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<p>&#25512;&#23548;&#32467;&#26524;&#31867;&#22411; <code>V1</code> &#19982; <code>V2</code> &#26159; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-decay.html"><span class="kw628">std::<span class="me2">decay</span></span></a><span class="sy1">&lt;</span>T1<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">type</span></span></span> &#19982; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-decay.html"><span class="kw628">std::<span class="me2">decay</span></span></a><span class="sy1">&lt;</span>T2<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">type</span></span></span> &#65288;&#24212;&#29992;&#21040;&#25353;&#20540;&#20256;&#36882;&#30340;&#20989;&#25968;&#21442;&#25968;&#30340;&#36890;&#24120;&#31867;&#22411;&#21464;&#25442;&#65289;&#65292;&#38500;&#38750;&#24212;&#29992; <span class="t-lc"><a href="cpp-types-decay.html">std::decay</a></span> &#21040;&#26576;&#31867;&#22411; <code>X</code> &#20135;&#29983; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-utility-functional-reference_wrapper.html"><span class="kw1068">std::<span class="me2">reference_wrapper</span></span></a><span class="sy1">&lt;</span>X<span class="sy1">&gt;</span></span></span> &#65292;&#27492;&#24773;&#20917;&#19979;&#25512;&#23548;&#32467;&#26524;&#31867;&#22411;&#26159; <code>X&amp;</code> &#12290;</p>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
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<td>t, u</td>
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<td>&#26500;&#36896; pair &#25152;&#29992;&#30340;&#20540;</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>&#21547;&#26377;&#25351;&#23450;&#20540;&#30340; <span class="t-lc"><a href="cpp-utility-pair.html">std::pair</a></span> &#23545;&#35937;&#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;iostream&gt;</span>
<span class="co2">#include &lt;utility&gt;</span>
<span class="co2">#include &lt;functional&gt;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<span class="kw4">int</span> n <span class="sy1">=</span> <span class="nu0">1</span><span class="sy4">;</span>
<span class="kw4">int</span> a<span class="br0">[</span><span class="nu0">5</span><span class="br0">]</span> <span class="sy1">=</span> <span class="br0">{</span><span class="nu0">1</span>, <span class="nu0">2</span>, <span class="nu0">3</span>, <span class="nu0">4</span>, <span class="nu0">5</span><span class="br0">}</span><span class="sy4">;</span>
<span class="co1">// &#20174;&#20108;&#20010; int &#24314;&#36896; pair</span>
<span class="kw4">auto</span> p1 <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">make_pair</span><span class="br0">(</span>n, a<span class="br0">[</span><span class="nu0">1</span><span class="br0">]</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-io-cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;The value of p1 is &quot;</span>
<span class="sy1">&lt;&lt;</span> <span class="st0">&quot;(&quot;</span> <span class="sy1">&lt;&lt;</span> p1.<span class="me1">first</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;, &quot;</span> <span class="sy1">&lt;&lt;</span> p1.<span class="me1">second</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;)<span class="es1">\n</span>&quot;</span><span class="sy4">;</span>
<span class="co1">// &#20174;&#21040; int &#30340;&#24341;&#29992;&#21644;&#25968;&#32452;&#65288;&#36864;&#21270;&#25104;&#25351;&#38024;&#65289;&#24314;&#36896; pair</span>
<span class="kw4">auto</span> p2 <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">make_pair</span><span class="br0">(</span><a href="cpp-utility-functional-ref.html"><span class="kw1069">std::<span class="me2">ref</span></span></a><span class="br0">(</span>n<span class="br0">)</span>, a<span class="br0">)</span><span class="sy4">;</span>
n <span class="sy1">=</span> <span class="nu0">7</span><span class="sy4">;</span>
<a href="cpp-io-cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;The value of p2 is &quot;</span>
<span class="sy1">&lt;&lt;</span> <span class="st0">&quot;(&quot;</span> <span class="sy1">&lt;&lt;</span> p2.<span class="me1">first</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;, &quot;</span> <span class="sy1">&lt;&lt;</span> <span class="sy2">*</span><span class="br0">(</span>p2.<span class="me1">second</span> <span class="sy2">+</span> <span class="nu0">2</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;)<span class="es1">\n</span>&quot;</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
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<p>&#36755;&#20986;&#65306;</p>
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<pre class="de1">The value of p1 is (1, 2)
The value of p2 is (7, 3)</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-functional-unwrap_reference.html"><span class="t-lines"><span>unwrap_reference</span><span>unwrap_ref_decay</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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<td>&#33719;&#21462;&#21253;&#35013;&#20110; <span class="t-lc"><a href="cpp-utility-functional-reference_wrapper.html">std::reference_wrapper</a></span> &#30340;&#24341;&#29992;&#31867;&#22411;<br />
<span class="t-mark">(&#31867;&#27169;&#26495;)</span></td>
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