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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::reverse_iterator&lt;Iter&gt;::</span>base</h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-iterator.html">iterator</a>&lrm; | <a href="cpp-iterator-reverse_iterator.html">reverse iterator</a></span></div>
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<div><span class="mw-geshi cpp source-cpp">iterator_type base<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-until-cxx17">(C++17 &#21069;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> iterator_type base<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx17">(C++17 &#36215;)</span></td>
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<p>&#36820;&#22238;&#24213;&#23618;&#36845;&#20195;&#22120;&#12290;&#21363; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-iterator-reverse_iterator.html"><span class="kw658">std::<span class="me2">reverse_iterator</span></span></a><span class="br0">(</span>it<span class="br0">)</span>.<span class="me1">base</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> it</span></span> &#12290;</p>
<p>&#24213;&#23618;&#36845;&#20195;&#22120;&#25351;&#20195;&#65288;&#30456;&#23545;&#20110; <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">reverse_iterator</span><span class="sy4">::</span><span class="me2">iterator_type</span></span></span> &#30340;&#65289; <code>reverse_iterator</code> &#24403;&#21069;&#25152;&#25351;&#20803;&#32032;&#30340;&#19979;&#19968;&#20010;&#20803;&#32032;&#12290;&#21363; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy3">&amp;</span><span class="sy2">*</span><span class="br0">(</span>rit.<span class="me1">base</span><span class="br0">(</span><span class="br0">)</span> <span class="sy2">-</span> <span class="nu0">1</span><span class="br0">)</span> <span class="sy1">==</span> <span class="sy3">&amp;</span><span class="sy2">*</span>rit</span></span> &#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>&#24213;&#23618;&#36845;&#20195;&#22120;&#12290;</p>
<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">&#24322;&#24120;</span></h3>
<p>&#21487;&#33021;&#25243;&#20986;&#23454;&#29616;&#23450;&#20041;&#30340;&#24322;&#24120;&#12290;</p>
<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;iostream&gt;</span>
<span class="co2">#include &lt;iterator&gt;</span>
<span class="co2">#include &lt;vector&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="sy1">=</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="nu0">5</span> <span class="br0">}</span><span class="sy4">;</span>
<span class="kw1">using</span> RevIt <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><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><span class="sy4">::</span><span class="me2">iterator</span><span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="br0">{</span>
<span class="kw4">const</span> <span class="kw4">auto</span> it <span class="sy1">=</span> v.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span> <span class="sy2">+</span> <span class="nu0">3</span><span class="sy4">;</span>
RevIt r_it<span class="br0">(</span>it<span class="br0">)</span><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;*it == &quot;</span> <span class="sy1">&lt;&lt;</span> <span class="sy2">*</span>it <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;, *r_it.base() == &quot;</span> <span class="sy1">&lt;&lt;</span> <span class="sy2">*</span>r_it.<span class="me1">base</span><span class="br0">(</span><span class="br0">)</span>
<span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;*r_it == &quot;</span> <span class="sy1">&lt;&lt;</span> <span class="sy2">*</span>r_it <span class="sy1">&lt;&lt;</span><span class="st0">&quot;, *(r_it.base()-1) == &quot;</span> <span class="sy1">&lt;&lt;</span> <span class="sy2">*</span><span class="br0">(</span>r_it.<span class="me1">base</span><span class="br0">(</span><span class="br0">)</span><span class="sy2">-</span><span class="nu0">1</span><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="br0">}</span>
<span class="br0">{</span>
RevIt r_end<span class="br0">(</span>v.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
RevIt r_begin<span class="br0">(</span>v.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">for</span> <span class="br0">(</span><span class="kw4">auto</span> it <span class="sy1">=</span> r_end.<span class="me1">base</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> it <span class="sy3">!</span><span class="sy1">=</span> r_begin.<span class="me1">base</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="sy2">++</span>it<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 class="sy2">*</span>it <span class="sy1">&lt;&lt;</span> <span class="st0">&quot; &quot;</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>
<span class="br0">}</span></pre></div>
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<p>&#36755;&#20986;&#65306;</p>
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<pre class="de1">*it == 3, *r_it.base() == 3
*r_it == 2, *(r_it.base()-1) == 2
0 1 2 3 4 5</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-iterator-reverse_iterator-operator*.html"><span class="t-lines"><span>operator*</span><span>operator-&gt;</span></span></a></div>
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<td>&#35775;&#38382;&#34987;&#25351;&#21521;&#30340;&#20803;&#32032;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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