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<title>operator+(std::counted_iterator)</title>
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<h1 id="firstHeading" class="firstHeading">operator+<small>(std::counted_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-counted_iterator.html">counted 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> counted_iterator operator<span class="sy2">+</span><span class="br0">(</span><br /></span>
<p>&nbsp; std<span class="sy4">::</span><span class="me2">iter_difference_t</span><span class="sy1">&lt;</span>I<span class="sy1">&gt;</span> n, <span class="kw4">const</span> counted_iterator<span class="sy3">&amp;</span> x <span class="br0">)</span><br /></p>
&nbsp; &nbsp; requires std<span class="sy4">::</span><span class="me2">random_access_iterator</span><span class="sy1">&lt;</span>I<span class="sy1">&gt;</span><span class="sy4">;</span></div>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></td>
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<p>&#36820;&#22238;&#21069;&#36827; <code>n</code> &#20010;&#20301;&#32622;&#30340;&#36845;&#20195;&#22120;&#36866;&#37197;&#22120;&#12290;&#33509; <code>n</code> &#22823;&#20110; <code>x</code> &#20869;&#35760;&#24405;&#30340;&#38271;&#24230;&#65288;&#21363;&#33509; <span class="t-c"><span class="mw-geshi cpp source-cpp">x <span class="sy2">+</span> n</span></span> &#23548;&#33268;&#26410;&#23450;&#20041;&#34892;&#20026;&#65289;&#21017;&#34892;&#20026;&#26410;&#23450;&#20041;&#12290;</p>
<p>&#27492;&#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>std::counted_iterator&lt;I&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>n</td>
<td>-</td>
<td>&#35201;&#22686;&#21152;&#36845;&#20195;&#22120;&#30340;&#20301;&#32622;&#25968;</td>
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<td>x</td>
<td>-</td>
<td>&#35201;&#22686;&#21152;&#30340;&#36845;&#20195;&#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>&#31561;&#20110; <span class="t-c"><span class="mw-geshi cpp source-cpp">x <span class="sy2">+</span> n</span></span> &#30340;&#36845;&#20195;&#22120;&#36866;&#37197;&#22120;&#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;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>
<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="nu0">4</span>, <span class="nu0">5</span> <span class="br0">}</span><span class="sy4">;</span>
std<span class="sy4">::</span><span class="me2">counted_iterator</span><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> p<span class="br0">{</span> v.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span> <span class="sy2">+</span> <span class="nu0">1</span>, <span class="nu0">4</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="st0">&quot;*p:&quot;</span> <span class="sy1">&lt;&lt;</span> <span class="sy2">*</span>p <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;, count:&quot;</span> <span class="sy1">&lt;&lt;</span> p.<span class="me1">count</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="sy4">;</span>
std<span class="sy4">::</span><span class="me2">counted_iterator</span><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> q<span class="br0">{</span> <span class="nu0">2</span> <span class="sy2">+</span> p <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;*q:&quot;</span> <span class="sy1">&lt;&lt;</span> <span class="sy2">*</span>q <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;, count:&quot;</span> <span class="sy1">&lt;&lt;</span> q.<span class="me1">count</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="sy4">;</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">6</span>, <span class="nu0">7</span>, <span class="nu0">8</span>, <span class="nu0">9</span> <span class="br0">}</span><span class="sy4">;</span>
std<span class="sy4">::</span><span class="me2">counted_iterator</span><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> r<span class="br0">{</span> l.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, <span class="nu0">3</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="st0">&quot;*r:&quot;</span> <span class="sy1">&lt;&lt;</span> <span class="sy2">*</span>r <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;, count:&quot;</span> <span class="sy1">&lt;&lt;</span> r.<span class="me1">count</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="sy4">;</span>
<span class="co1">// auto s { 2 + r }; // &#38169;&#35823;&#65306;&#24213;&#23618;&#36845;&#20195;&#22120;&#19981;&#23454;&#29616; std::random_access_iterator</span>
<span class="br0">}</span></pre></div>
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<p>&#36755;&#20986;&#65306;</p>
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<pre class="de1">*p:1, count:4
*q:3, count:2
*r:6, count:3</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-counted_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>
<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>&#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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<div><a href="cpp-iterator-counted_iterator-operator-.html"><span class="t-lines"><span>operator-</span></span></a></div>
<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>&#35745;&#31639;&#20004;&#20010;&#36845;&#20195;&#22120;&#36866;&#37197;&#22120;&#38388;&#30340;&#36317;&#31163;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
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<div><a href="cpp-iterator-counted_iterator-operator-2.html"><span class="t-lines"><span>operator-<span class="t-dsc-small">(std::default_sentinel_t)</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>
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<td>&#35745;&#31639;&#21040;&#26411;&#23614;&#30340;&#26377;&#31526;&#21495;&#36317;&#31163;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
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