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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::ranges::views::</span>all, <span style="font-size:0.7em; line-height:130%">std::ranges::views::</span>all_t</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></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">inline</span> <span class="kw4">constexpr</span> <span class="coMULTI">/*unspecified*/</span> all <span class="sy1">=</span> <span class="coMULTI">/*unspecified*/</span><span class="sy4">;</span></span></div>
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<td>(1)</td>
<td><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span> <span class="sy1">&lt;</span>ranges<span class="sy4">::</span><span class="me2">viewable_range</span> R<span class="sy1">&gt;</span><br />
<span class="kw1">using</span> all_t <span class="sy1">=</span> decltype<span class="br0">(</span>views<span class="sy4">::</span><span class="me2">all</span><span class="br0">(</span><a href="cpp-utility-declval.html"><span class="kw1120">std::<span class="me2">declval</span></span></a><span class="sy1">&lt;</span>R<span class="sy1">&gt;</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(2)</td>
<td><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></td>
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<div class="t-li1"><span class="t-li">1)</span> &#36820;&#22238;&#21253;&#21547;&#20854; <a href="cpp-ranges-range.html"><code>range</code></a> &#21442;&#25968;&#30340;&#25152;&#26377;&#20803;&#32032;&#30340; <a href="cpp-ranges-view.html"><code>view</code></a> &#30340;<a href="cpp-ranges.html#.E8.8C.83.E5.9B.B4.E9.80.82.E9.85.8D.E5.99.A8.E5.AF.B9.E8.B1.A1">&#33539;&#22260;&#36866;&#37197;&#22120;&#23545;&#35937;</a>&#65288;&#20134;&#20026;<a href="cpp-ranges.html#.E8.8C.83.E5.9B.B4.E9.80.82.E9.85.8D.E5.99.A8.E9.97.AD.E5.8C.85.E5.AF.B9.E8.B1.A1">&#33539;&#22260;&#36866;&#37197;&#22120;&#38381;&#21253;&#23545;&#35937;</a>&#65289;&#12290;<br />
<p>&#34920;&#36798;&#24335; <span class="t-c"><span class="mw-geshi cpp source-cpp">views<span class="sy4">::</span><span class="me2">all</span><span class="br0">(</span>e<span class="br0">)</span></span></span> &#34920;&#36798;&#24335;&#31561;&#20215;&#20110;&#65306;</p>
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<li>&#38544;&#24335;&#36716;&#25442; <span class="t-c"><span class="mw-geshi cpp source-cpp">e</span></span> &#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-decay.html"><span class="kw629">std::<span class="me2">decay_t</span></span></a><span class="sy1">&lt;</span>decltype<span class="br0">(</span><span class="br0">(</span>e<span class="br0">)</span><span class="br0">)</span><span class="sy1">&gt;</span></span></span> &#32431;&#21491;&#20540;&#65292;&#33509;&#32467;&#26524;&#31867;&#22411;&#23454;&#29616; <a href="cpp-ranges-view.html"><code>view</code></a> &#12290;</li>
<li>&#21542;&#21017;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">ref_view</span><span class="br0">{</span>e<span class="br0">}</span></span></span> &#65292;&#33509;&#35813;&#34920;&#36798;&#24335;&#20026;&#33391;&#26500;&#12290;</li>
<li>&#21542;&#21017;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">owning_view</span><span class="br0">{</span>e<span class="br0">}</span></span></span> &#12290;</li>
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<div class="t-li1"><span class="t-li">2)</span> &#35745;&#31639; <a href="cpp-ranges-viewable_range.html"><code>viewable_range</code></a> &#31867;&#22411;&#30340;&#36866;&#21512; <a href="cpp-ranges-view.html"><code>view</code></a> &#31867;&#22411;&#12290;</div>
<h3><span class="mw-headline" id=".E8.A1.A8.E8.BE.BE.E5.BC.8F.E7.AD.89.E4.BB.B7">&#34920;&#36798;&#24335;&#31561;&#20215;</span></h3>
<p>&#34920;&#36798;&#24335; <span class="t-c"><span class="mw-geshi cpp source-cpp">e</span></span> <i>&#34920;&#36798;&#24335;&#31561;&#20215;</i>&#20110;&#34920;&#36798;&#24335; <span class="t-c"><span class="mw-geshi cpp source-cpp">f</span></span> &#65292;&#33509; <span class="t-c"><span class="mw-geshi cpp source-cpp">e</span></span> &#19982; <span class="t-c"><span class="mw-geshi cpp source-cpp">f</span></span> &#25317;&#26377;&#30456;&#21516;&#25928;&#26524;&#65292;&#22343;&#20026;<a href="cpp-language-noexcept_spec.html">&#28508;&#22312;&#25243;&#20986;</a>&#25110;&#22343;&#38750;&#28508;&#22312;&#25243;&#20986;&#65288;&#21363; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw1">noexcept</span><span class="br0">(</span>e<span class="br0">)</span> <span class="sy1">==</span> <span class="kw1">noexcept</span><span class="br0">(</span>f<span class="br0">)</span></span></span> &#65289;&#65292;&#19988;&#22343;&#20026;<a href="cpp-language-constant_expression.html">&#24120;&#37327;&#23376;&#34920;&#36798;&#24335;</a>&#25110;&#22343;&#38750;&#24120;&#37327;&#23376;&#34920;&#36798;&#24335;&#12290;</p>
<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;ranges&gt;</span>
<span class="co2">#include &lt;vector&gt;</span>
<span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;type_traits&gt;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<a href="cpp-container-vector.html"><span class="kw1269">std::<span class="me2">vector</span></span></a><span class="sy1">&lt;</span><span class="kw4">int</span><span class="sy1">&gt;</span> v<span class="br0">{</span><span class="nu0">0</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="kw1">for</span><span class="br0">(</span><span class="kw4">int</span> n <span class="sy4">:</span> std<span class="sy4">::</span><span class="me2">views</span><span class="sy4">::</span><span class="me2">all</span><span class="br0">(</span>v<span class="br0">)</span> <span class="sy3">|</span> std<span class="sy4">::</span><span class="me2">views</span><span class="sy4">::</span><span class="me2">take</span><span class="br0">(</span><span class="nu0">2</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> n <span class="sy1">&lt;&lt;</span> <span class="st0">&#39; &#39;</span><span class="sy4">;</span>
<span class="br0">}</span>
static_assert<span class="br0">(</span><a href="cpp-types-is_same.html"><span class="kw588">std::<span class="me2">is_same</span></span></a><span class="sy1">&lt;</span>
decltype<span class="br0">(</span>std<span class="sy4">::</span><span class="me2">views</span><span class="sy4">::</span><span class="me2">single</span><span class="br0">(</span><span class="nu0">42</span><span class="br0">)</span><span class="br0">)</span>,
std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">single_view</span><span class="sy1">&lt;</span><span class="kw4">int</span><span class="sy1">&gt;</span>
<span class="sy1">&gt;</span><span class="br0">{</span><span class="br0">}</span><span class="br0">)</span><span class="sy4">;</span>
static_assert<span class="br0">(</span><a href="cpp-types-is_same.html"><span class="kw588">std::<span class="me2">is_same</span></span></a><span class="sy1">&lt;</span>
decltype<span class="br0">(</span>std<span class="sy4">::</span><span class="me2">views</span><span class="sy4">::</span><span class="me2">all</span><span class="br0">(</span>v<span class="br0">)</span><span class="br0">)</span>,
std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">ref_view</span><span class="sy1">&lt;</span><a href="cpp-container-vector.html"><span class="kw1269">std::<span class="me2">vector</span></span></a><span class="sy1">&lt;</span><span class="kw4">int</span>, <a href="cpp-memory-allocator.html"><span class="kw700">std::<span class="me2">allocator</span></span></a><span class="sy1">&lt;</span><span class="kw4">int</span><span class="sy1">&gt;&gt;&gt;</span>
<span class="sy1">&gt;</span><span class="br0">{</span><span class="br0">}</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw4">int</span> a<span class="br0">[</span><span class="br0">]</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="br0">}</span><span class="sy4">;</span>
static_assert<span class="br0">(</span><a href="cpp-types-is_same.html"><span class="kw588">std::<span class="me2">is_same</span></span></a><span class="sy1">&lt;</span>
decltype<span class="br0">(</span>std<span class="sy4">::</span><span class="me2">views</span><span class="sy4">::</span><span class="me2">all</span><span class="br0">(</span>a<span class="br0">)</span><span class="br0">)</span>,
std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">ref_view</span><span class="sy1">&lt;</span><span class="kw4">int</span> <span class="br0">[</span><span class="nu0">4</span><span class="br0">]</span><span class="sy1">&gt;</span>
<span class="sy1">&gt;</span><span class="br0">{</span><span class="br0">}</span><span class="br0">)</span><span class="sy4">;</span>
static_assert<span class="br0">(</span><a href="cpp-types-is_same.html"><span class="kw588">std::<span class="me2">is_same</span></span></a><span class="sy1">&lt;</span>
decltype<span class="br0">(</span>std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">subrange</span><span class="br0">{</span><a href="cpp-iterator-begin.html"><span class="kw676">std::<span class="me2">begin</span></span></a><span class="br0">(</span>a<span class="br0">)</span><span class="sy2">+</span><span class="nu0">1</span>, <a href="cpp-iterator-end.html"><span class="kw680">std::<span class="me2">end</span></span></a><span class="br0">(</span>a<span class="br0">)</span><span class="sy2">-</span><span class="nu0">1</span><span class="br0">}</span><span class="br0">)</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>, std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">subrange_kind</span><span class="br0">(</span><span class="nu0">1</span><span class="br0">)</span><span class="sy1">&gt;</span>
<span class="sy1">&gt;</span><span class="br0">{</span><span class="br0">}</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
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<p>&#36755;&#20986;&#65306;</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="text source-text">
<pre class="de1">0 1</pre></div>
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<h3><span class="mw-headline" id=".E7.BC.BA.E9.99.B7.E6.8A.A5.E5.91.8A">&#32570;&#38519;&#25253;&#21578;</span></h3>
<p>&#19979;&#21015;&#26356;&#25913;&#34892;&#20026;&#30340;&#32570;&#38519;&#25253;&#21578;&#36861;&#28335;&#22320;&#24212;&#29992;&#20110;&#20197;&#21069;&#20986;&#29256;&#30340; C++ &#26631;&#20934;&#12290;</p>
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<th>DR</th>
<th>&#24212;&#29992;&#20110;</th>
<th>&#20986;&#29256;&#26102;&#30340;&#34892;&#20026;</th>
<th>&#27491;&#30830;&#34892;&#20026;</th>
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<tr>
<td><a rel="nofollow" class="external text" href="https://wg21.link/P2415R2">P2415R2</a></td>
<td>C++20</td>
<td><code>views::all</code> &#23545;&#38750; <a href="cpp-ranges-view.html"><code>view</code></a> &#21491;&#20540; <a href="cpp-ranges-range.html"><code>range</code></a> &#36820;&#22238; <code>subrange</code></td>
<td>&#23545;&#20854;&#36820;&#22238; <code>owning_view</code></td>
</tr>
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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 class="t-dsc-member-div">
<div><a href="cpp-ranges-empty_view.html"><span class="t-lines"><span>ranges::empty_view</span><span>views::empty</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
</div>
</td>
<td>&#26080;&#20803;&#32032;&#30340;&#31354; <a href="cpp-ranges-view.html"><code>view</code></a><br />
<span class="t-mark">(&#31867;&#27169;&#26495;)</span> <span class="t-mark">(&#21464;&#37327;&#27169;&#26495;)</span></td>
</tr>
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<td>
<div class="t-dsc-member-div">
<div><a href="cpp-ranges-single_view.html"><span class="t-lines"><span>ranges::single_view</span><span>views::single</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
</div>
</td>
<td>&#21547;&#26377;&#20855;&#26377;&#25351;&#23450;&#20540;&#30340;&#21333;&#20010;&#20803;&#32032;&#30340; <a href="cpp-ranges-view.html"><code>view</code></a><br />
<span class="t-mark">(&#31867;&#27169;&#26495;)</span> <span class="t-mark">(&#23450;&#21046;&#28857;&#23545;&#35937;)</span></td>
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