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<title>&#26631;&#20934;&#24211;&#22836;&#25991;&#20214; &lt;span&gt;</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">&#26631;&#20934;&#24211;&#22836;&#25991;&#20214;</span> &lt;span&gt;</h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-header.html">header</a></span></div>
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<p>&#27492;&#22836;&#25991;&#20214;&#26159;<a href="cpp-container.html">&#23481;&#22120;</a>&#24211;&#30340;&#19968;&#37096;&#20998;&#12290;</p>
<table class="t-dsc-begin">
<tr>
<td colspan="2">
<h3><span class="mw-headline" id=".E7.B1.BB">&#31867;</span></h3>
</td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-container-span.html"><span class="t-lines"><span>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>
</div>
</td>
<td>&#23545;&#35937;&#30340;&#36830;&#32493;&#24207;&#21015;&#19978;&#30340;&#26080;&#25152;&#26377;&#26435;&#35270;&#22270;<br />
<span class="t-mark">(&#31867;&#27169;&#26495;)</span></td>
</tr>
<tr>
<td colspan="2">
<h3><span class="mw-headline" id=".E5.B8.B8.E9.87.8F">&#24120;&#37327;</span></h3>
</td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-container-span-dynamic_extent.html"><span class="t-lines"><span>dynamic_extent</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><code>size_t</code> &#31867;&#22411;&#24120;&#37327;&#65292;&#25351;&#26126; <code>span</code> &#25317;&#26377;&#21160;&#24577;&#38271;&#24230;<br />
<span class="t-mark">(&#24120;&#37327;)</span></td>
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<tr>
<td colspan="2">
<h3><span class="mw-headline" id=".E5.87.BD.E6.95.B0">&#20989;&#25968;</span></h3>
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<div><a href="cpp-container-span-as_bytes.html"><span class="t-lines"><span>as_bytes</span><span>as_writable_bytes</span></span></a></div>
</div>
</td>
<td>&#36716;&#25442; <code>span</code> &#20026;&#23545;&#20854;&#24213;&#23618;&#23383;&#33410;&#30340;&#35270;&#22270;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
</tr>
<tr>
<td colspan="2">
<h5><span class="mw-headline" id=".E8.8C.83.E5.9B.B4.E8.AE.BF.E9.97.AE">&#33539;&#22260;&#35775;&#38382;</span></h5>
</td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-iterator-begin.html"><span class="t-lines"><span>begin</span><span>cbegin</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span><span class="t-mark-rev t-since-cxx14">(C++14)</span></span></span></div>
</div>
</td>
<td>&#36820;&#22238;&#25351;&#21521;&#23481;&#22120;&#25110;&#25968;&#32452;&#36215;&#22987;&#30340;&#36845;&#20195;&#22120;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-iterator-end.html"><span class="t-lines"><span>end</span><span>cend</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span><span class="t-mark-rev t-since-cxx14">(C++14)</span></span></span></div>
</div>
</td>
<td>&#36820;&#22238;&#25351;&#21521;&#23481;&#22120;&#25110;&#25968;&#32452;&#32467;&#23614;&#30340;&#36845;&#20195;&#22120;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-iterator-rbegin.html"><span class="t-lines"><span>rbegin</span><span>crbegin</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx14">(C++14)</span></span></span></div>
</div>
</td>
<td>&#36820;&#22238;&#25351;&#21521;&#19968;&#20010;&#23481;&#22120;&#25110;&#25968;&#32452;&#30340;&#36870;&#21521;&#36845;&#20195;&#22120;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-iterator-rend.html"><span class="t-lines"><span>rend</span><span>crend</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx14">(C++14)</span></span></span></div>
</div>
</td>
<td>&#36820;&#22238;&#23481;&#22120;&#25110;&#25968;&#32452;&#30340;&#36870;&#21521;&#23614;&#36845;&#20195;&#22120;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-iterator-size.html"><span class="t-lines"><span>size</span><span>ssize</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
</div>
</td>
<td>&#36820;&#22238;&#23481;&#22120;&#25110;&#25968;&#32452;&#30340;&#22823;&#23567;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-iterator-empty.html"><span class="t-lines"><span>empty</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div>
</div>
</td>
<td>&#26816;&#26597;&#23481;&#22120;&#26159;&#21542;&#20026;&#31354;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-iterator-data.html"><span class="t-lines"><span>data</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div>
</div>
</td>
<td>&#33719;&#24471;&#25351;&#21521;&#24213;&#23618;&#25968;&#32452;&#30340;&#25351;&#38024;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
</tr>
</table>
<h3><span class="mw-headline" id=".E6.A6.82.E8.A6.81">&#27010;&#35201;</span></h3>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="cpp source-cpp">
<pre class="de1"><span class="kw1">namespace</span> std <span class="br0">{</span>
<span class="co1">// &#24120;&#37327;</span>
<span class="kw1">inline</span> <span class="kw4">constexpr</span> size_t dynamic_extent <span class="sy1">=</span> numeric_limits<span class="sy1">&lt;</span>size_t<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">max</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
<span class="co1">// &#31867;&#27169;&#26495; span</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> ElementType, size_t Extent <span class="sy1">=</span> dynamic_extent<span class="sy1">&gt;</span>
<span class="kw1">class</span> span<span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> ElementType, size_t Extent<span class="sy1">&gt;</span>
<span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> ranges<span class="sy4">::</span><span class="me2">enable_borrowed_range</span><span class="sy1">&lt;</span>span<span class="sy1">&lt;</span>ElementType, Extent<span class="sy1">&gt;&gt;</span> <span class="sy1">=</span> <span class="kw2">true</span><span class="sy4">;</span>
<span class="co1">// &#23545;&#35937;&#34920;&#31034;&#30340;&#35270;&#22270;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> ElementType, size_t Extent<span class="sy1">&gt;</span>
span<span class="sy1">&lt;</span><span class="kw4">const</span> byte,
Extent <span class="sy1">==</span> dynamic_extent <span class="sy4">?</span> dynamic_extent <span class="sy4">:</span> sizeof<span class="br0">(</span>ElementType<span class="br0">)</span> <span class="sy2">*</span> Extent<span class="sy1">&gt;</span>
as_bytes<span class="br0">(</span>span<span class="sy1">&lt;</span>ElementType, Extent<span class="sy1">&gt;</span> s<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> ElementType, size_t Extent<span class="sy1">&gt;</span>
span<span class="sy1">&lt;</span>byte, Extent <span class="sy1">==</span> dynamic_extent <span class="sy4">?</span> dynamic_extent <span class="sy4">:</span> sizeof<span class="br0">(</span>ElementType<span class="br0">)</span> <span class="sy2">*</span> Extent<span class="sy1">&gt;</span>
as_writable_bytes<span class="br0">(</span>span<span class="sy1">&lt;</span>ElementType, Extent<span class="sy1">&gt;</span> s<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
</div>
<h4><span class="mw-headline" id=".E7.B1.BB.E6.A8.A1.E6.9D.BF_std::span">&#31867;&#27169;&#26495; <span class="t-lc">std::span</span></span></h4>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="cpp source-cpp">
<pre class="de1"><span class="kw1">namespace</span> std <span class="br0">{</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> ElementType, size_t Extent <span class="sy1">=</span> dynamic_extent<span class="sy1">&gt;</span>
<span class="kw1">class</span> span <span class="br0">{</span>
<span class="kw1">public</span><span class="sy4">:</span>
<span class="co1">// &#24120;&#37327;&#19982;&#31867;&#22411;</span>
<span class="kw1">using</span> element_type <span class="sy1">=</span> ElementType<span class="sy4">;</span>
<span class="kw1">using</span> value_type <span class="sy1">=</span> remove_cv_t<span class="sy1">&lt;</span>ElementType<span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="kw1">using</span> size_type <span class="sy1">=</span> size_t<span class="sy4">;</span>
<span class="kw1">using</span> difference_type <span class="sy1">=</span> ptrdiff_t<span class="sy4">;</span>
<span class="kw1">using</span> pointer <span class="sy1">=</span> element_type<span class="sy2">*</span><span class="sy4">;</span>
<span class="kw1">using</span> const_pointer <span class="sy1">=</span> <span class="kw4">const</span> element_type<span class="sy2">*</span><span class="sy4">;</span>
<span class="kw1">using</span> reference <span class="sy1">=</span> element_type<span class="sy3">&amp;</span><span class="sy4">;</span>
<span class="kw1">using</span> const_reference <span class="sy1">=</span> <span class="kw4">const</span> element_type<span class="sy3">&amp;</span><span class="sy4">;</span>
<span class="kw1">using</span> iterator <span class="sy1">=</span> <span class="coMULTI">/* &#30001;&#23454;&#29616;&#23450;&#20041; */</span><span class="sy4">;</span>
<span class="kw1">using</span> reverse_iterator <span class="sy1">=</span> <a href="cpp-iterator-reverse_iterator.html"><span class="kw658">std::<span class="me2">reverse_iterator</span></span></a><span class="sy1">&lt;</span>iterator<span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> size_type extent <span class="sy1">=</span> Extent<span class="sy4">;</span>
<span class="co1">// &#26500;&#36896;&#20989;&#25968;&#12289;&#22797;&#21046;&#19982;&#36171;&#20540;</span>
<span class="kw4">constexpr</span> span<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> It<span class="sy1">&gt;</span>
<span class="kw4">constexpr</span> <span class="kw1">explicit</span><span class="br0">(</span>extent <span class="sy3">!</span><span class="sy1">=</span> dynamic_extent<span class="br0">)</span> span<span class="br0">(</span>It first, size_type count<span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> It, <span class="kw1">class</span> End<span class="sy1">&gt;</span>
<span class="kw4">constexpr</span> <span class="kw1">explicit</span><span class="br0">(</span>extent <span class="sy3">!</span><span class="sy1">=</span> dynamic_extent<span class="br0">)</span> span<span class="br0">(</span>It first, End last<span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span>size_t N<span class="sy1">&gt;</span>
<span class="kw4">constexpr</span> span<span class="br0">(</span>type_identity_t<span class="sy1">&lt;</span>element_type<span class="sy1">&gt;</span> <span class="br0">(</span><span class="sy3">&amp;</span>arr<span class="br0">)</span><span class="br0">[</span>N<span class="br0">]</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T, size_t N<span class="sy1">&gt;</span>
<span class="kw4">constexpr</span> span<span class="br0">(</span>array<span class="sy1">&lt;</span>T, N<span class="sy1">&gt;</span><span class="sy3">&amp;</span> arr<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T, size_t N<span class="sy1">&gt;</span>
<span class="kw4">constexpr</span> span<span class="br0">(</span><span class="kw4">const</span> array<span class="sy1">&lt;</span>T, N<span class="sy1">&gt;</span><span class="sy3">&amp;</span> arr<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> R<span class="sy1">&gt;</span>
<span class="kw4">constexpr</span> <span class="kw1">explicit</span><span class="br0">(</span>extent <span class="sy3">!</span><span class="sy1">=</span> dynamic_extent<span class="br0">)</span> span<span class="br0">(</span>R<span class="sy3">&amp;&amp;</span> r<span class="br0">)</span><span class="sy4">;</span>
<span class="kw4">constexpr</span> span<span class="br0">(</span><span class="kw4">const</span> span<span class="sy3">&amp;</span> other<span class="br0">)</span> <span class="kw1">noexcept</span> <span class="sy1">=</span> <span class="kw1">default</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> OtherElementType, size_t OtherExtent<span class="sy1">&gt;</span>
<span class="kw4">constexpr</span> <span class="kw1">explicit</span><span class="br0">(</span><span class="coMULTI">/* &#35265;&#25551;&#36848; */</span><span class="br0">)</span>
span<span class="br0">(</span><span class="kw4">const</span> span<span class="sy1">&lt;</span>OtherElementType, OtherExtent<span class="sy1">&gt;</span><span class="sy3">&amp;</span> s<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
~span<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span> <span class="sy1">=</span> <span class="kw1">default</span><span class="sy4">;</span>
<span class="kw4">constexpr</span> span<span class="sy3">&amp;</span> operator<span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> span<span class="sy3">&amp;</span> other<span class="br0">)</span> <span class="kw1">noexcept</span> <span class="sy1">=</span> <span class="kw1">default</span><span class="sy4">;</span>
<span class="co1">// &#23376;&#35270;&#22270;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span>size_t Count<span class="sy1">&gt;</span>
<span class="kw4">constexpr</span> span<span class="sy1">&lt;</span>element_type, Count<span class="sy1">&gt;</span> first<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span>size_t Count<span class="sy1">&gt;</span>
<span class="kw4">constexpr</span> span<span class="sy1">&lt;</span>element_type, Count<span class="sy1">&gt;</span> last<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span>size_t Offset, size_t Count <span class="sy1">=</span> dynamic_extent<span class="sy1">&gt;</span>
<span class="kw4">constexpr</span> span<span class="sy1">&lt;</span>element_type, <span class="coMULTI">/* see description */</span><span class="sy1">&gt;</span> subspan<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
<span class="kw4">constexpr</span> span<span class="sy1">&lt;</span>element_type, dynamic_extent<span class="sy1">&gt;</span> first<span class="br0">(</span>size_type count<span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
<span class="kw4">constexpr</span> span<span class="sy1">&lt;</span>element_type, dynamic_extent<span class="sy1">&gt;</span> last<span class="br0">(</span>size_type count<span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
<span class="kw4">constexpr</span> span<span class="sy1">&lt;</span>element_type, dynamic_extent<span class="sy1">&gt;</span> subspan<span class="br0">(</span>
size_type offset, size_type count <span class="sy1">=</span> dynamic_extent<span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
<span class="co1">// &#35266;&#23519;&#22120;</span>
<span class="kw4">constexpr</span> size_type size<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="kw4">constexpr</span> size_type size_bytes<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="br0">[</span><span class="br0">[</span>nodiscard<span class="br0">]</span><span class="br0">]</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> empty<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="co1">// &#20803;&#32032;&#35775;&#38382;</span>
<span class="kw4">constexpr</span> reference operator<span class="br0">[</span><span class="br0">]</span><span class="br0">(</span>size_type idx<span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
<span class="kw4">constexpr</span> reference front<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
<span class="kw4">constexpr</span> reference back<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
<span class="kw4">constexpr</span> pointer data<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="co1">// &#36845;&#20195;&#22120;&#25903;&#25345;</span>
<span class="kw4">constexpr</span> iterator begin<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="kw4">constexpr</span> iterator end<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="kw4">constexpr</span> reverse_iterator rbegin<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="kw4">constexpr</span> reverse_iterator rend<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="kw1">private</span><span class="sy4">:</span>
pointer data_<span class="sy4">;</span> <span class="co1">// &#20165;&#29992;&#20110;&#38416;&#37322;</span>
size_type size_<span class="sy4">;</span> <span class="co1">// &#20165;&#29992;&#20110;&#38416;&#37322;</span>
<span class="br0">}</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> It, <span class="kw1">class</span> EndOrSize<span class="sy1">&gt;</span>
span<span class="br0">(</span>It, EndOrSize<span class="br0">)</span> <span class="sy2">-</span><span class="sy1">&gt;</span> span<span class="sy1">&lt;</span>remove_reference_t<span class="sy1">&lt;</span>iter_reference_t<span class="sy1">&lt;</span>It<span class="sy1">&gt;&gt;&gt;</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T, size_t N<span class="sy1">&gt;</span>
span<span class="br0">(</span>T <span class="br0">(</span><span class="sy3">&amp;</span><span class="br0">)</span><span class="br0">[</span>N<span class="br0">]</span><span class="br0">)</span> <span class="sy2">-</span><span class="sy1">&gt;</span> span<span class="sy1">&lt;</span>T, N<span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T, size_t N<span class="sy1">&gt;</span>
span<span class="br0">(</span>array<span class="sy1">&lt;</span>T, N<span class="sy1">&gt;</span><span class="sy3">&amp;</span><span class="br0">)</span> <span class="sy2">-</span><span class="sy1">&gt;</span> span<span class="sy1">&lt;</span>T, N<span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T, size_t N<span class="sy1">&gt;</span>
span<span class="br0">(</span><span class="kw4">const</span> array<span class="sy1">&lt;</span>T, N<span class="sy1">&gt;</span><span class="sy3">&amp;</span><span class="br0">)</span> <span class="sy2">-</span><span class="sy1">&gt;</span> span<span class="sy1">&lt;</span><span class="kw4">const</span> T, N<span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> R<span class="sy1">&gt;</span>
span<span class="br0">(</span>R<span class="sy3">&amp;&amp;</span><span class="br0">)</span> <span class="sy2">-</span><span class="sy1">&gt;</span> span<span class="sy1">&lt;</span>remove_reference_t<span class="sy1">&lt;</span>ranges<span class="sy4">::</span><span class="me2">range_reference_t</span><span class="sy1">&lt;</span>R<span class="sy1">&gt;&gt;&gt;</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
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