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<title>operator+,-(ranges::elements_view::iterator)</title>
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<h1 id="firstHeading" class="firstHeading">operator+,-<small>(ranges::elements_view::<i>iterator</i>)</small></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>&lrm; | <a href="cpp-ranges-elements_view.html">elements view</a>&lrm; | <a href="cpp-ranges-elements_view-iterator.html">iterator</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="coMULTI">/*iterator*/</span> operator<span class="sy2">+</span><span class="br0">(</span> <span class="kw4">const</span> <span class="coMULTI">/*iterator*/</span><span class="sy3">&amp;</span> i, difference_type n <span class="br0">)</span><br />
&nbsp; &nbsp; requires ranges<span class="sy4">::</span><span class="me2">random_access_range</span><span class="sy1">&lt;</span>Base<span class="sy1">&gt;</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">friend</span> <span class="kw4">constexpr</span> <span class="coMULTI">/*iterator*/</span> operator<span class="sy2">+</span><span class="br0">(</span> difference_type n, <span class="kw4">const</span> <span class="coMULTI">/*iterator*/</span><span class="sy3">&amp;</span> i <span class="br0">)</span><br />
&nbsp; &nbsp; requires ranges<span class="sy4">::</span><span class="me2">random_access_range</span><span class="sy1">&lt;</span>Base<span class="sy1">&gt;</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><span class="mw-geshi cpp source-cpp"><span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="coMULTI">/*iterator*/</span> operator<span class="sy2">-</span><span class="br0">(</span> <span class="kw4">const</span> <span class="coMULTI">/*iterator*/</span><span class="sy3">&amp;</span> i, difference_type n <span class="br0">)</span><br />
&nbsp; &nbsp; requires ranges<span class="sy4">::</span><span class="me2">random_access_range</span><span class="sy1">&lt;</span>Base<span class="sy1">&gt;</span><span class="sy4">;</span></span></div>
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<td>(3)</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">friend</span> <span class="kw4">constexpr</span> difference_type operator<span class="sy2">-</span><span class="br0">(</span> <span class="kw4">const</span> <span class="coMULTI">/*iterator*/</span><span class="sy3">&amp;</span> x,<br /></span>
<p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw4">const</span> <span class="coMULTI">/*iterator*/</span><span class="sy3">&amp;</span> y <span class="br0">)</span><br /></p>
&nbsp; &nbsp; requires std<span class="sy4">::</span><span class="me2">sized_sentinel_for</span><span class="sy1">&lt;</span>ranges<span class="sy4">::</span><span class="me2">iterator_t</span><span class="sy1">&lt;</span>Base<span class="sy1">&gt;</span>, ranges<span class="sy4">::</span><span class="me2">iterator_t</span><span class="sy1">&lt;</span>Base<span class="sy1">&gt;&gt;</span><span class="sy4">;</span></div>
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<td>(4)</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">1,2)</span> &#36820;&#22238;&#22686;&#21152; <code>n</code> &#30340;&#36845;&#20195;&#22120; <code>i</code> &#12290;</div>
<div class="t-li1"><span class="t-li">3)</span> &#36820;&#22238;&#20943;&#23569; <code>n</code> &#30340;&#36845;&#20195;&#22120; <code>i</code></div>
<div class="t-li1"><span class="t-li">4)</span> &#36820;&#22238; <code>x</code> &#19982; <code>y</code> &#20043;&#38388;&#30340;&#36317;&#31163;&#12290;</div>
<p>&#36825;&#20123;&#20989;&#25968;&#23545;&#36890;&#24120;<a href="cpp-language-unqualified_lookup.html">&#26080;&#38480;&#23450;</a>&#25110;<a href="cpp-language-qualified_lookup.html">&#26377;&#38480;&#23450;&#26597;&#25214;</a>&#19981;&#21487;&#35265;&#65292;&#32780;&#21482;&#33021;&#22312; <code>elements_view::<i>iterator</i>&lt;Const&gt;</code> &#20026;&#21442;&#25968;&#30340;&#20851;&#32852;&#31867;&#26102;&#30001;<a href="cpp-language-adl.html">&#23454;&#21442;&#20381;&#36182;&#26597;&#25214;</a>&#25214;&#21040;&#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
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<td>i, x, y</td>
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<td>&#36845;&#20195;&#22120;</td>
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<td>n</td>
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<td>&#30456;&#23545;&#20110;&#24403;&#21069;&#20301;&#32622;&#30340;&#20301;&#32622;</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>
<div class="t-li1"><span class="t-li">1-2)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="br0">[</span><span class="sy3">&amp;</span><span class="br0">]</span><span class="br0">{</span> <span class="kw4">auto</span> j <span class="sy1">=</span> i<span class="sy4">;</span> j <span class="sy2">+</span><span class="sy1">=</span> n<span class="sy4">;</span> <span class="kw1">return</span> j<span class="sy4">;</span> <span class="br0">}</span><span class="br0">(</span><span class="br0">)</span></span></span></div>
<div class="t-li1"><span class="t-li">3)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="br0">[</span><span class="sy3">&amp;</span><span class="br0">]</span><span class="br0">{</span> <span class="kw4">auto</span> j <span class="sy1">=</span> i<span class="sy4">;</span> j <span class="sy2">-</span><span class="sy1">=</span> n<span class="sy4">;</span> <span class="kw1">return</span> j<span class="sy4">;</span> <span class="br0">}</span><span class="br0">(</span><span class="br0">)</span></span></span></div>
<div class="t-li1"><span class="t-li">4)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp">x.<span class="me1">base</span><span class="br0">(</span><span class="br0">)</span> <span class="sy2">-</span> y.<span class="me1">base</span><span class="br0">(</span><span class="br0">)</span></span></span></div>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
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