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<title>std::span&lt;T,Extent&gt;::back</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::span&lt;T,Extent&gt;::</span>back</h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-container.html">container</a>&lrm; | <a href="cpp-container-span.html">span</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><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></div>
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<p>&#36820;&#22238;&#21040; span &#20013;&#26411;&#20803;&#32032;&#30340;&#24341;&#29992;&#12290;</p>
<p>&#22312;&#31354; span &#19978;&#35843;&#29992; <code>back</code> &#23548;&#33268;&#26410;&#23450;&#20041;&#34892;&#20026;&#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
<p>&#65288;&#26080;&#65289;</p>
<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<p>&#21040;&#23614;&#20803;&#32032;&#30340;&#24341;&#29992;&#12290;</p>
<h3><span class="mw-headline" id=".E5.A4.8D.E6.9D.82.E5.BA.A6">&#22797;&#26434;&#24230;</span></h3>
<p>&#24120;&#25968;</p>
<h3><span class="mw-headline" id=".E6.B3.A8.E8.A7.A3">&#27880;&#35299;</span></h3>
<p>&#23545;&#20110; span <code>c</code> &#65292;&#34920;&#36798;&#24335; <span class="t-c"><span class="mw-geshi cpp source-cpp">c.<span class="me1">back</span><span class="br0">(</span><span class="br0">)</span></span></span> &#31561;&#20215;&#20110; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span><span class="br0">(</span>c.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span><span class="sy2">-</span><span class="nu0">1</span><span class="br0">)</span></span></span> &#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;span&gt;</span>
<span class="co2">#include &lt;iostream&gt;</span>
<span class="kw4">void</span> print_forward<span class="br0">(</span>std<span class="sy4">::</span><span class="me2">span</span><span class="sy1">&lt;</span><span class="kw4">const</span> <span class="kw4">int</span><span class="sy1">&gt;</span> <span class="kw4">const</span> span<span class="br0">)</span> <span class="br0">{</span>
<span class="kw1">for</span> <span class="br0">(</span><span class="kw4">auto</span> n <span class="br0">{</span> span.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span> <span class="br0">}</span><span class="sy4">;</span> n <span class="sy3">!</span><span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span> <span class="sy2">--</span>n <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> span.<span class="me1">last</span><span class="br0">(</span>n<span class="br0">)</span>.<span class="me1">front</span><span class="br0">(</span><span class="br0">)</span> <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">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span>
<span class="br0">}</span>
<span class="kw4">void</span> print_backward<span class="br0">(</span>std<span class="sy4">::</span><span class="me2">span</span><span class="sy1">&lt;</span><span class="kw4">const</span> <span class="kw4">int</span><span class="sy1">&gt;</span> <span class="kw4">const</span> span<span class="br0">)</span> <span class="br0">{</span>
<span class="kw1">for</span> <span class="br0">(</span><span class="kw4">auto</span> n <span class="br0">{</span> span.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span> <span class="br0">}</span><span class="sy4">;</span> n <span class="sy3">!</span><span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span> <span class="sy2">--</span>n<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> span.<span class="me1">first</span><span class="br0">(</span>n<span class="br0">)</span>.<span class="me1">back</span><span class="br0">(</span><span class="br0">)</span> <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">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</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="kw4">constexpr</span> <span class="kw4">int</span> numbers<span class="br0">[</span><span class="br0">]</span> <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="br0">}</span><span class="sy4">;</span>
print_forward<span class="br0">(</span>numbers<span class="br0">)</span><span class="sy4">;</span>
print_backward<span class="br0">(</span>numbers<span class="br0">)</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">0 1 2 3 4
4 3 2 1 0</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><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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<td>&#35775;&#38382;&#31532;&#19968;&#20010;&#20803;&#32032;<br />
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