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hustoj/web/cppreference-zh/chmhelp/cpp-iterator-reverse_iterator-operator+.html
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<title>operator+(std::reverse_iterator)</title>
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<h1 id="firstHeading" class="firstHeading">operator+<small>(std::reverse_iterator)</small></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>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code><a href="cpp-header-iterator.html">&lt;iterator&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> Iter <span class="sy1">&gt;</span><br /></span>
<p>reverse_iterator<span class="sy1">&lt;</span>Iter<span class="sy1">&gt;</span><br />
&nbsp; &nbsp; operator<span class="sy2">+</span><span class="br0">(</span> <span class="kw1">typename</span> reverse_iterator<span class="sy1">&lt;</span>Iter<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">difference_type</span> n,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span class="kw4">const</span> reverse_iterator<span class="sy1">&lt;</span>Iter<span class="sy1">&gt;</span><span class="sy3">&amp;</span> it <span class="br0">)</span><span class="sy4">;</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="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> Iter <span class="sy1">&gt;</span><br /></span>
<p><span class="kw4">constexpr</span> reverse_iterator<span class="sy1">&lt;</span>Iter<span class="sy1">&gt;</span><br />
&nbsp; &nbsp; operator<span class="sy2">+</span><span class="br0">(</span> <span class="kw1">typename</span> reverse_iterator<span class="sy1">&lt;</span>Iter<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">difference_type</span> n,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span class="kw4">const</span> reverse_iterator<span class="sy1">&lt;</span>Iter<span class="sy1">&gt;</span><span class="sy3">&amp;</span> it <span class="br0">)</span><span class="sy4">;</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;&#22686;&#21152;&#20102; <code>n</code> &#30340; <code>it</code> &#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
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<td>n</td>
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<td>&#22686;&#21152;&#36845;&#20195;&#22120;&#25152;&#29992;&#30340;&#20301;&#32622;&#25968;</td>
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<td>it</td>
<td>-</td>
<td>&#35201;&#22686;&#21152;&#30340;&#36845;&#20195;&#22120;&#36866;&#37197;&#22120;</td>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<p>&#22686;&#21152;&#30340;&#36845;&#20195;&#22120;&#65292;&#21363; <span class="t-c"><span class="mw-geshi cpp source-cpp">reverse_iterator<span class="sy1">&lt;</span>Iter<span class="sy1">&gt;</span><span class="br0">(</span>it.<span class="me1">base</span><span class="br0">(</span><span class="br0">)</span> <span class="sy2">-</span> n<span class="br0">)</span></span></span></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;list&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>
<span class="br0">{</span>
<a href="cpp-container-vector.html"><span class="kw1269">std::<span class="me2">vector</span></span></a> 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="br0">}</span><span class="sy4">;</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>
ri1 <span class="br0">{</span> <a href="cpp-iterator-reverse_iterator.html"><span class="kw658">std::<span class="me2">reverse_iterator</span></span></a><span class="br0">{</span> v.<span class="me1">rbegin</span><span class="br0">(</span><span class="br0">)</span> <span class="br0">}</span> <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="sy2">*</span>ri1 <span class="sy1">&lt;&lt;</span> <span class="st0">&#39; &#39;</span><span class="sy4">;</span> <span class="co1">// 3</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> ri2 <span class="br0">{</span> <span class="nu0">2</span> <span class="sy2">+</span> ri1 <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="sy2">*</span>ri2 <span class="sy1">&lt;&lt;</span> <span class="st0">&#39; &#39;</span><span class="sy4">;</span> <span class="co1">// 1</span>
<span class="br0">}</span>
<span class="br0">{</span>
<a href="cpp-container-list.html"><span class="kw1275">std::<span class="me2">list</span></span></a> l <span class="br0">{</span><span class="nu0">5</span>, <span class="nu0">6</span>, <span class="nu0">7</span>, <span class="nu0">8</span><span class="br0">}</span><span class="sy4">;</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-list.html"><span class="kw1275">std::<span class="me2">list</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>
ri1<span class="br0">{</span> <a href="cpp-iterator-reverse_iterator.html"><span class="kw658">std::<span class="me2">reverse_iterator</span></span></a><span class="br0">{</span> l.<span class="me1">rbegin</span><span class="br0">(</span><span class="br0">)</span> <span class="br0">}</span> <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="sy2">*</span>ri1 <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span> <span class="co1">// 8</span>
<span class="co1">// auto ri2 { 2 + ri1 }; // &#38169;&#35823;&#65306;&#24213;&#23618;&#36845;&#20195;&#22120;&#19981;&#23454;&#29616;&#38543;&#26426;&#35775;&#38382;&#36845;&#20195;&#22120;</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">3 1 8</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_arith.html"><span class="t-lines"><span>operator++</span><span>operator++<span class="t-dsc-small">(int)</span></span><span>operator+=</span><span>operator+</span><span>operator--</span><span>operator--<span class="t-dsc-small">(int)</span></span><span>operator-=</span><span>operator-</span></span></a></div>
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<td>&#25512;&#36827;&#25110;&#22238;&#36864;&#36845;&#20195;&#22120;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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