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<title>std::tuple_size&lt;std:ranges::subrange&gt;</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>tuple_size<small>&lt;std:ranges::subrange&gt;</small></h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-ranges.html">ranges</a>&lrm; | <a href="cpp-ranges-subrange.html">subrange</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code><a href="cpp-header-ranges.html">&lt;ranges&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> I, <span class="kw1">class</span> S, ranges<span class="sy4">::</span><span class="me2">subrange_kind</span> K <span class="sy1">&gt;</span><br /></span>
<p><span class="kw1">struct</span> tuple_size<span class="sy1">&lt;</span>ranges<span class="sy4">::</span><span class="me2">subrange</span><span class="sy1">&lt;</span>I, S, K<span class="sy1">&gt;&gt;</span><br /></p>
&nbsp; &nbsp; <span class="sy4">:</span> <a href="cpp-types-integral_constant.html"><span class="kw647">std::<span class="me2">integral_constant</span></span></a><span class="sy1">&lt;</span><a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a>, <span class="nu0">2</span><span class="sy1">&gt;</span> <span class="br0">{</span><span class="br0">}</span><span class="sy4">;</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><a href="cpp-utility-tuple_size.html"><tt>std::tuple_size</tt></a> &#23545; <span class="t-lc">std::ranges::subrange</span> &#30340;&#37096;&#20998;&#29305;&#21270;&#25552;&#20379;&#32534;&#35793;&#26102;&#33719;&#24471; <code>subrange</code> &#30340;&#32452;&#20998;&#25968;&#37327;&#30340;&#26041;&#24335;&#65292;&#35813;&#25968;&#22987;&#32456;&#20026; 2 &#12290;&#23427;&#26159;&#20026;&#32467;&#26500;&#21270;&#32465;&#23450;&#25903;&#25345;&#25552;&#20379;&#30340;&#12290;</p>
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<h2><span class="mw-headline" id=".E7.BB.A7.E6.89.BF.E8.87.AA_std::integral_constant">&#32487;&#25215;&#33258; <a href="cpp-types-integral_constant.html"><span style="font-size:0.7em; line-height:130%">std::</span>integral_constant</a></span></h2>
<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.B8.B8.E9.87.8F">&#25104;&#21592;&#24120;&#37327;</span></h3>
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<div><span class="t-lines"><span>value</span></span></div>
<div><span class="t-lines"><span><span class="t-cmark">[&#38745;&#24577;]</span></span></span></div>
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<td>&#24120;&#37327;&#20540; 2<br />
<span class="t-mark">(&#20844;&#24320;&#38745;&#24577;&#25104;&#21592;&#24120;&#37327;)</span></td>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">&#25104;&#21592;&#20989;&#25968;</span></h3>
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<div><span class="t-lines"><span>operator std::size_t</span></span></div>
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<td>&#36716;&#25442;&#23545;&#35937;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a></span></span> &#65292;&#36820;&#22238; <code>value</code><br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div><span class="t-lines"><span>operator()</span></span></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx14">(C++14)</span></span></span></div>
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<td>&#36820;&#22238; <code>value</code><br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E7.B1.BB.E5.9E.8B">&#25104;&#21592;&#31867;&#22411;</span></h3>
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<td>&#31867;&#22411;</td>
<td>&#23450;&#20041;</td>
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<td><code>value_type</code></td>
<td><code>std::size_t</code></td>
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<td><code>type</code></td>
<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-integral_constant.html"><span class="kw647">std::<span class="me2">integral_constant</span></span></a><span class="sy1">&lt;</span><a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a>, value<span class="sy1">&gt;</span></span></span></td>
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<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;array&gt;</span>
<span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;iterator&gt;</span>
<span class="co2">#include &lt;ranges&gt;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
static_assert<span class="br0">(</span><span class="nu0">2</span> <span class="sy1">==</span> <a href="cpp-utility-tuple-tuple_size.html"><span class="kw1102">std::<span class="me2">tuple_size_v</span></span></a><span class="sy1">&lt;</span>std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">subrange</span><span class="sy1">&lt;</span><span class="kw4">int</span><span class="sy2">*</span>, <span class="kw4">int</span><span class="sy2">*</span><span class="sy1">&gt;&gt;</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">using</span> array5 <span class="sy1">=</span> <a href="cpp-container-array.html"><span class="kw1268">std::<span class="me2">array</span></span></a><span class="sy1">&lt;</span><span class="kw4">int</span>, <span class="nu0">5</span><span class="sy1">&gt;</span><span class="sy4">;</span>
static_assert<span class="br0">(</span><span class="nu0">2</span> <span class="sy1">==</span> <a href="cpp-utility-tuple-tuple_size.html"><span class="kw1101">std::<span class="me2">tuple_size</span></span></a><span class="sy1">&lt;</span>std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">subrange</span><span class="sy1">&lt;</span>
array5<span class="sy4">::</span><span class="me2">const_iterator</span>, array5<span class="sy4">::</span><span class="me2">const_iterator</span><span class="sy1">&gt;&gt;</span><span class="br0">{</span><span class="br0">}</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw4">constexpr</span> array5 a<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>
std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">subrange</span> sub_a1<span class="br0">{</span>a<span class="br0">}</span><span class="sy4">;</span>
<span class="kw1">for</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> <span class="st0">&quot;sub_a1: { &quot;</span><span class="sy4">;</span> <span class="kw4">int</span> e <span class="sy4">:</span> sub_a1<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> e <span class="sy1">&lt;&lt;</span> <span class="st0">&#39; &#39;</span><span class="sy4">;</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> <span class="st0">&quot;}<span class="es1">\n</span>&quot;</span><span class="sy4">;</span>
std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">subrange</span> sub_a2<span class="br0">{</span><a href="cpp-iterator-next.html"><span class="kw674">std::<span class="me2">next</span></span></a><span class="br0">(</span>cbegin<span class="br0">(</span>a<span class="br0">)</span><span class="br0">)</span>, <a href="cpp-iterator-prev.html"><span class="kw675">std::<span class="me2">prev</span></span></a><span class="br0">(</span>cend<span class="br0">(</span>a<span class="br0">)</span><span class="br0">)</span><span class="br0">}</span><span class="sy4">;</span>
<span class="kw4">const</span> <span class="kw4">auto</span> <span class="br0">[</span>first, last<span class="br0">]</span> <span class="sy1">=</span> sub_a2<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">&quot;sub_a2 size = &quot;</span> <span class="sy1">&lt;&lt;</span> <a href="cpp-iterator-distance.html"><span class="kw673">std::<span class="me2">distance</span></span></a><span class="br0">(</span>first, last<span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span>
<span class="kw1">for</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> <span class="st0">&quot;sub_a2: { &quot;</span><span class="sy4">;</span> <span class="kw4">int</span> e <span class="sy4">:</span> sub_a2<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> e <span class="sy1">&lt;&lt;</span> <span class="st0">&#39; &#39;</span><span class="sy4">;</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> <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">sub_a1: { 1 2 3 4 5 }
sub_a2 size = 3
sub_a2: { 2 3 4 }</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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<td><a href="cpp-language-structured_binding.html">&#32467;&#26500;&#21270;&#32465;&#23450;</a> <span class="t-mark-rev t-since-cxx17">(C++17)</span></td>
<td>&#32465;&#23450;&#25351;&#23450;&#30340;&#21517;&#23383;&#21040;&#21021;&#22987;&#21270;&#22120;&#30340;&#23376;&#23545;&#35937;&#25110;&#20803;&#32452;&#20803;&#32032;</td>
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<div><a href="cpp-utility-tuple_size.html"><span class="t-lines"><span>tuple_size</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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<td>&#33719;&#24471;&#20803;&#32452;&#24335;&#31867;&#22411;&#30340;&#20803;&#32032;&#25968;<br />
<span class="t-mark">(&#31867;&#27169;&#26495;)</span></td>
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<div><a href="cpp-ranges-subrange-tuple_element.html"><span class="t-lines"><span>std::tuple_element<span class="t-dsc-small">&lt;std::ranges::subrange&gt;</span></span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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<td>&#33719;&#24471; <span class="t-lc">std::ranges::subrange</span> &#30340;&#36845;&#20195;&#22120;&#25110;&#21736;&#20301;&#30340;&#31867;&#22411;<br />
<span class="t-mark">(&#31867;&#27169;&#26495;&#29305;&#21270;)</span></td>
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