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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>make_tuple</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-tuple.html">tuple</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code><a href="cpp-header-tuple.html">&lt;tuple&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>... <span class="me1">Types</span> <span class="sy1">&gt;</span><br />
<a href="cpp-utility-tuple.html"><span class="kw1098">std::<span class="me2">tuple</span></span></a><span class="sy1">&lt;</span>VTypes...<span class="sy1">&gt;</span> make_tuple<span class="br0">(</span> Types<span class="sy3">&amp;&amp;</span>... <span class="me1">args</span> <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">(C++14 &#36215;&#20026; constexpr)</span></td>
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<p>&#21019;&#24314; tuple &#23545;&#35937;&#65292;&#20174;&#21442;&#25968;&#31867;&#22411;&#25512;&#23548;&#30446;&#26631;&#31867;&#22411;&#12290;</p>
<p>&#23545;&#20110;&#27599;&#20010; <code>Types...</code> &#20013;&#30340; <code>Ti</code> &#65292; <code>Vtypes...</code> &#20013;&#30340;&#23545;&#24212;&#31867;&#22411; <code>Vi</code> &#20026; <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>Ti<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">type</span></span></span> &#65292;&#38500;&#38750;&#24212;&#29992; <span class="t-lc"><a href="cpp-types-decay.html">std::decay</a></span> &#23545;&#26576;&#20123;&#31867;&#22411; <code>X</code> &#23548;&#33268; <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;&#35813;&#24773;&#20917;&#19979;&#25512;&#23548;&#30340;&#31867;&#22411;&#20026; <code>X&amp;</code> &#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
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<td>args</td>
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<td>&#26500;&#36896; tuple &#25152;&#29992;&#30340;&#38646;&#25110;&#26356;&#22810;&#21442;&#25968;</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;&#32473;&#23450;&#20540;&#30340; <span class="t-lc"><a href="cpp-utility-tuple.html">std::tuple</a></span> &#23545;&#35937;&#65292;&#22914;&#21516;&#29992; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-utility-tuple.html"><span class="kw1098">std::<span class="me2">tuple</span></span></a><span class="sy1">&lt;</span>VTypes...<span class="sy1">&gt;</span><span class="br0">(</span><a href="cpp-utility-forward.html"><span class="kw1116">std::<span class="me2">forward</span></span></a><span class="sy1">&lt;</span>Types<span class="sy1">&gt;</span><span class="br0">(</span>t<span class="br0">)</span>...<span class="br0">)</span>.</span></span> &#21019;&#24314;</p>
<h3><span class="mw-headline" id=".E5.8F.AF.E8.83.BD.E7.9A.84.E5.AE.9E.E7.8E.B0">&#21487;&#33021;&#30340;&#23454;&#29616;</span></h3>
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<pre class="de1"><span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> T<span class="sy1">&gt;</span>
<span class="kw1">struct</span> unwrap_refwrapper
<span class="br0">{</span>
<span class="kw1">using</span> type <span class="sy1">=</span> T<span class="sy4">;</span>
<span class="br0">}</span><span class="sy4">;</span>
<span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> T<span class="sy1">&gt;</span>
<span class="kw1">struct</span> unwrap_refwrapper<span class="sy1">&lt;</span><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>T<span class="sy1">&gt;&gt;</span>
<span class="br0">{</span>
<span class="kw1">using</span> type <span class="sy1">=</span> T<span class="sy3">&amp;</span><span class="sy4">;</span>
<span class="br0">}</span><span class="sy4">;</span>
<span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> T<span class="sy1">&gt;</span>
<span class="kw1">using</span> unwrap_decay_t <span class="sy1">=</span> <span class="kw1">typename</span> unwrap_refwrapper<span class="sy1">&lt;</span><span class="kw1">typename</span> <a href="cpp-types-decay.html"><span class="kw628">std::<span class="me2">decay</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">type</span><span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">type</span><span class="sy4">;</span>
<span class="co1">// &#25110;&#20351;&#29992; std::unwrap_ref_decay_t &#65288; C++20 &#36215;&#65289;</span>
<span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span>... <span class="me1">Types</span><span class="sy1">&gt;</span>
<span class="kw4">constexpr</span> <span class="co1">// since C++14</span>
<a href="cpp-utility-tuple.html"><span class="kw1098">std::<span class="me2">tuple</span></span></a><span class="sy1">&lt;</span>unwrap_decay_t<span class="sy1">&lt;</span>Types<span class="sy1">&gt;</span>...<span class="sy1">&gt;</span> make_tuple<span class="br0">(</span>Types<span class="sy3">&amp;&amp;</span>... <span class="me1">args</span><span class="br0">)</span>
<span class="br0">{</span>
<span class="kw1">return</span> <a href="cpp-utility-tuple.html"><span class="kw1098">std::<span class="me2">tuple</span></span></a><span class="sy1">&lt;</span>unwrap_decay_t<span class="sy1">&lt;</span>Types<span class="sy1">&gt;</span>...<span class="sy1">&gt;</span><span class="br0">(</span><a href="cpp-utility-forward.html"><span class="kw1116">std::<span class="me2">forward</span></span></a><span class="sy1">&lt;</span>Types<span class="sy1">&gt;</span><span class="br0">(</span>args<span class="br0">)</span>...<span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
<div class="t-example">
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<pre class="de1"><span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;tuple&gt;</span>
<span class="co2">#include &lt;functional&gt;</span>
<a href="cpp-utility-tuple.html"><span class="kw1098">std::<span class="me2">tuple</span></span></a><span class="sy1">&lt;</span><span class="kw4">int</span>, <span class="kw4">int</span><span class="sy1">&gt;</span> f<span class="br0">(</span><span class="br0">)</span> <span class="co1">// &#27492;&#20989;&#25968;&#36820;&#22238;&#22810;&#20540;</span>
<span class="br0">{</span>
<span class="kw4">int</span> x <span class="sy1">=</span> <span class="nu0">5</span><span class="sy4">;</span>
<span class="kw1">return</span> std<span class="sy4">::</span><span class="me2">make_tuple</span><span class="br0">(</span>x, <span class="nu0">7</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// return {x,7}; &#20110; C++17</span>
<span class="br0">}</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<span class="co1">// &#24322;&#31867; tuple &#26500;&#36896;</span>
<span class="kw4">int</span> n <span class="sy1">=</span> <span class="nu0">1</span><span class="sy4">;</span>
<span class="kw4">auto</span> t <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">make_tuple</span><span class="br0">(</span><span class="nu0">10</span>, <span class="st0">&quot;Test&quot;</span>, <span class="nu16">3.14</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>, n<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 t is &quot;</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;(&quot;</span>
<span class="sy1">&lt;&lt;</span> std<span class="sy4">::</span><span class="me2">get</span><span class="sy1">&lt;</span><span class="nu0">0</span><span class="sy1">&gt;</span><span class="br0">(</span>t<span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;, &quot;</span> <span class="sy1">&lt;&lt;</span> std<span class="sy4">::</span><span class="me2">get</span><span class="sy1">&lt;</span><span class="nu0">1</span><span class="sy1">&gt;</span><span class="br0">(</span>t<span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;, &quot;</span>
<span class="sy1">&lt;&lt;</span> std<span class="sy4">::</span><span class="me2">get</span><span class="sy1">&lt;</span><span class="nu0">2</span><span class="sy1">&gt;</span><span class="br0">(</span>t<span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;, &quot;</span> <span class="sy1">&lt;&lt;</span> std<span class="sy4">::</span><span class="me2">get</span><span class="sy1">&lt;</span><span class="nu0">3</span><span class="sy1">&gt;</span><span class="br0">(</span>t<span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;, &quot;</span>
<span class="sy1">&lt;&lt;</span> std<span class="sy4">::</span><span class="me2">get</span><span class="sy1">&lt;</span><span class="nu0">4</span><span class="sy1">&gt;</span><span class="br0">(</span>t<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="co1">// &#36820;&#22238;&#22810;&#20540;&#30340;&#20989;&#25968;</span>
<span class="kw4">int</span> a, b<span class="sy4">;</span>
<a href="cpp-utility-tuple-tie.html"><span class="kw1112">std::<span class="me2">tie</span></span></a><span class="br0">(</span>a, b<span class="br0">)</span> <span class="sy1">=</span> f<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> a <span class="sy1">&lt;&lt;</span> <span class="st0">&quot; &quot;</span> <span class="sy1">&lt;&lt;</span> b <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 t is (10, Test, 3.14, 7, 1)
5 7</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-tuple-tie.html"><span class="t-lines"><span>tie</span></span></a></div>
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<td>&#21019;&#24314;&#24038;&#20540;&#24341;&#29992;&#30340; <code>tuple</code>&#65292;&#25110;&#23558; tuple &#35299;&#21253;&#20026;&#29420;&#31435;&#23545;&#35937;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
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<div><a href="cpp-utility-tuple-forward_as_tuple.html"><span class="t-lines"><span>forward_as_tuple</span></span></a></div>
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<td>&#21019;&#24314;<a href="cpp-language-reference.html#.E8.BD.AC.E5.8F.91.E5.BC.95.E7.94.A8">&#36716;&#21457;&#24341;&#29992;</a>&#30340; <code>tuple</code><br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-utility-tuple-tuple_cat.html"><span class="t-lines"><span>tuple_cat</span></span></a></div>
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<td>&#36890;&#36807;&#36830;&#25509;&#20219;&#24847;&#25968;&#37327;&#30340;&#20803;&#32452;&#26469;&#21019;&#24314;&#19968;&#20010;<code>tuple</code><br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-utility-apply.html"><span class="t-lines"><span>apply</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div>
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<td>&#20197;&#19968;&#20010;&#23454;&#21442;&#30340;&#20803;&#32452;&#26469;&#35843;&#29992;&#20989;&#25968;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
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<div class="t-dsc-member-div">
<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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