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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::common_iterator&lt;I,S&gt;::</span>common_iterator</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-common_iterator.html">common iterator</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> common_iterator<span class="br0">(</span><span class="br0">)</span> requires std<span class="sy4">::</span><span class="me2">default_initializable</span><span class="sy1">&lt;</span>I<span class="sy1">&gt;</span> <span class="sy1">=</span> <span class="kw1">default</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="kw4">constexpr</span> common_iterator<span class="br0">(</span> I i <span class="br0">)</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="kw4">constexpr</span> common_iterator<span class="br0">(</span> S s <span class="br0">)</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">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> I2, <span class="kw1">class</span> S2 <span class="sy1">&gt;</span><br /></span>
<p>requires std<span class="sy4">::</span><span class="me2">convertible_to</span><span class="sy1">&lt;</span><span class="kw4">const</span> I2<span class="sy3">&amp;</span>, I<span class="sy1">&gt;</span> <span class="sy3">&amp;&amp;</span><br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;std<span class="sy4">::</span><span class="me2">convertible_to</span><span class="sy1">&lt;</span><span class="kw4">const</span> S2<span class="sy3">&amp;</span>, S<span class="sy1">&gt;</span><br /></p>
<span class="kw4">constexpr</span> common_iterator<span class="br0">(</span> <span class="kw4">const</span> common_iterator<span class="sy1">&lt;</span>I2, S2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> x <span class="br0">)</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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<p>&#26500;&#36896;&#26032;&#30340;&#36845;&#20195;&#22120;&#36866;&#37197;&#22120;&#65292;&#31561;&#25928;&#22320;&#21021;&#22987;&#21270;&#24213;&#23618; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-utility-variant.html"><span class="kw1085">std::<span class="me2">variant</span></span></a><span class="sy1">&lt;</span>I, S<span class="sy1">&gt;</span></span></span> &#25104;&#21592;&#23545;&#35937; <code><i>var</i></code> &#20197;&#20445;&#26377;&#19968;&#20010; <code>I</code> &#65288;&#36845;&#20195;&#22120;&#65289;&#25110; <code>S</code> &#65288;&#21736;&#20301;&#65289;&#23545;&#35937;&#12290;</p>
<div class="t-li1"><span class="t-li">1)</span> &#40664;&#35748;&#26500;&#36896;&#20989;&#25968;&#12290;&#40664;&#35748;&#21021;&#22987;&#21270; <code><i>var</i></code> &#12290;&#26500;&#36896;&#21518;&#65292; <code><i>var</i></code> &#20445;&#26377;&#19968;&#20010;&#20540;&#21021;&#22987;&#21270;&#30340; <code>I</code> &#23545;&#35937;&#12290;&#22312;&#20135;&#29983;&#30340;&#36845;&#20195;&#22120;&#36866;&#37197;&#22120;&#19978;&#30340;&#25805;&#20316;&#25317;&#26377;&#26377;&#23450;&#20041;&#34892;&#20026;&#65292;&#24403;&#19988;&#20165;&#24403;&#20540;&#21021;&#22987;&#21270;&#30340; <code>I</code> &#19978;&#30340;&#25805;&#20316;&#20134;&#25317;&#26377;&#26377;&#23450;&#20041;&#34892;&#20026;&#12290;</div>
<div class="t-li1"><span class="t-li">2)</span> &#26500;&#36896;&#21518; <code><i>var</i></code> &#20445;&#26377;&#19968;&#20010;&#20174; <code>i</code> &#31227;&#21160;&#26500;&#36896;&#30340; <code>I</code> &#23545;&#35937;&#12290;</div>
<div class="t-li1"><span class="t-li">3)</span> &#26500;&#36896;&#21518; <code><i>var</i></code> &#20445;&#26377;&#19968;&#20010;&#20174; <code>s</code> &#31227;&#21160;&#26500;&#36896;&#30340; <code>S</code> &#23545;&#35937;&#12290;</div>
<div class="t-li1"><span class="t-li">4)</span> &#33509; <span class="t-c"><span class="mw-geshi cpp source-cpp">x.<span class="me1">var</span></span></span> &#20445;&#26377;&#19968;&#20010; <code>I2</code> &#25110; <code>S2</code> &#65292;&#21017;&#26500;&#36896;&#21518; <code><i>var</i></code> &#20998;&#21035;&#20445;&#26377;&#19968;&#20010;&#20174; <span class="t-c"><span class="mw-geshi cpp source-cpp">x.<span class="me1">var</span></span></span> &#25152;&#20445;&#26377;&#30340;&#35813;&#21487;&#36873;&#39033;&#21021;&#22987;&#21270;&#30340; <code>I</code> &#25110; <code>S</code> &#23545;&#35937;&#12290;&#33509; <code>x</code> &#22312;&#38750;&#27861;&#29366;&#24577;&#65292;&#21363; <span class="t-c"><span class="mw-geshi cpp source-cpp">x.<span class="me1">var</span>.<span class="me1">valueless_by_exception</span><span class="br0">(</span><span class="br0">)</span></span></span> &#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> &#21017;&#34892;&#20026;&#26410;&#23450;&#20041;&#12290;</div>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
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<td>i</td>
<td>-</td>
<td>&#35201;&#36866;&#37197;&#30340;&#36845;&#20195;&#22120;</td>
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<td>s</td>
<td>-</td>
<td>&#35201;&#36866;&#37197;&#30340;&#21736;&#20301;</td>
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<td>x</td>
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<td>&#35201;&#36716;&#25442;&#30340;&#36845;&#20195;&#22120;&#36866;&#37197;&#22120;</td>
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<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;algorithm&gt;</span>
<span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;iterator&gt;</span>
<span class="co2">#include &lt;numeric&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">3</span>,<span class="nu0">1</span>,<span class="nu0">4</span>,<span class="nu0">1</span>,<span class="nu0">5</span>,<span class="nu0">9</span>,<span class="nu0">2</span><span class="br0">}</span><span class="sy4">;</span>
<span class="kw1">using</span> CI <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">common_iterator</span><span class="sy1">&lt;</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>,
std<span class="sy4">::</span><span class="me2">default_sentinel_t</span>
<span class="sy1">&gt;</span><span class="sy4">;</span>
CI unused<span class="sy4">;</span> <span class="co1">// (1)</span>
CI start <span class="br0">{</span> std<span class="sy4">::</span><span class="me2">counted_iterator</span><span class="br0">{</span><a href="cpp-iterator-next.html"><span class="kw674">std::<span class="me2">next</span></span></a><span class="br0">(</span>begin<span class="br0">(</span>v<span class="br0">)</span><span class="br0">)</span>, ssize<span class="br0">(</span>v<span class="br0">)</span><span class="sy2">-</span><span class="nu0">2</span><span class="br0">}</span> <span class="br0">}</span><span class="sy4">;</span> <span class="co1">// (2)</span>
CI finish <span class="br0">{</span> std<span class="sy4">::</span><span class="me2">default_sentinel</span> <span class="br0">}</span><span class="sy4">;</span> <span class="co1">// (3)</span>
CI first <span class="br0">{</span> start <span class="br0">}</span><span class="sy4">;</span> <span class="co1">// (4)</span>
CI last <span class="br0">{</span> finish <span class="br0">}</span><span class="sy4">;</span> <span class="co1">// (4)</span>
<a href="cpp-algorithm-copy.html"><span class="kw1582">std::<span class="me2">copy</span></span></a><span class="br0">(</span>first, last, <a href="cpp-iterator-ostream_iterator.html"><span class="kw670">std::<span class="me2">ostream_iterator</span></span></a><span class="sy1">&lt;</span><span class="kw4">int</span><span class="sy1">&gt;</span><span class="br0">{</span><a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a>, <span class="st0">&quot; &quot;</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="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span>
std<span class="sy4">::</span><span class="me2">common_iterator</span><span class="sy1">&lt;</span>
std<span class="sy4">::</span><span class="me2">counted_iterator</span><span class="sy1">&lt;</span>
<a href="cpp-iterator-ostream_iterator.html"><span class="kw670">std::<span class="me2">ostream_iterator</span></span></a><span class="sy1">&lt;</span><span class="kw4">double</span><span class="sy1">&gt;&gt;</span>,
std<span class="sy4">::</span><span class="me2">default_sentinel_t</span><span class="sy1">&gt;</span>
beg <span class="br0">{</span> std<span class="sy4">::</span><span class="me2">counted_iterator</span><span class="br0">{</span><a href="cpp-iterator-ostream_iterator.html"><span class="kw670">std::<span class="me2">ostream_iterator</span></span></a><span class="sy1">&lt;</span><span class="kw4">double</span><span class="sy1">&gt;</span><span class="br0">{</span><a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a>,<span class="st0">&quot;; &quot;</span><span class="br0">}</span>, <span class="nu0">5</span><span class="br0">}</span> <span class="br0">}</span>,
end <span class="br0">{</span> std<span class="sy4">::</span><span class="me2">default_sentinel</span> <span class="br0">}</span><span class="sy4">;</span>
<a href="cpp-algorithm-iota.html"><span class="kw1655">std::<span class="me2">iota</span></span></a><span class="br0">(</span>beg, end, <span class="nu16">3.1</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">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
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<p>&#36755;&#20986;&#65306;</p>
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<div class="text source-text">
<pre class="de1">1 4 1 5 9
3.1; 4.1; 5.1; 6.1; 7.1;</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-common_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>&#36171;&#20540;&#21478;&#19968;&#36845;&#20195;&#22120;&#36866;&#37197;&#22120;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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