171 lines
13 KiB
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171 lines
13 KiB
HTML
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<title>std::iter_move(std::counted_iterator)</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_iterator_counted_iterator_iter_move skin-cppreference2 action-view cpp-navbar">
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>iter_move<small>(std::counted_iterator)</small></h1>
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<div id="bodyContent">
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-iterator.html">iterator</a>‎ | <a href="cpp-iterator-counted_iterator.html">counted iterator</a></span></div>
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<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">friend</span> <span class="kw4">constexpr</span> std<span class="sy4">::</span><span class="me2">iter_rvalue_reference_t</span><span class="sy1"><</span>I<span class="sy1">></span><br /></span>
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<p> iter_move<span class="br0">(</span> <span class="kw4">const</span> std<span class="sy4">::</span><span class="me2">counted_iterator</span><span class="sy3">&</span> i <span class="br0">)</span><br />
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<span class="kw1">noexcept</span><span class="br0">(</span><span class="kw1">noexcept</span><span class="br0">(</span>ranges<span class="sy4">::</span><span class="me2">iter_move</span><span class="br0">(</span>i.<span class="me1">current</span><span class="br0">)</span><span class="br0">)</span><span class="br0">)</span><br /></p>
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requires std<span class="sy4">::</span><span class="me2">input_iterator</span><span class="sy1"><</span>I<span class="sy1">></span><span class="sy4">;</span></div>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<tr class="t-dcl-sep">
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<td></td>
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<td></td>
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<td></td>
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<p>转型解引用底层迭代器的结果到其关联右值引用类型。若 <span class="t-c"><span class="mw-geshi cpp source-cpp">i.<span class="me1">count</span><span class="br0">(</span><span class="br0">)</span></span></span> 等于 <span class="t-c"><span class="mw-geshi cpp source-cpp">​<span class="nu0">0</span>​</span></span> 则行为未定义。</p>
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<p>函数体等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw1">return</span> ranges​<span class="sy4">::</span>​iter_move<span class="br0">(</span>i.<span class="me1">current</span><span class="br0">)</span><span class="sy4">;</span></span></span> ，其中 <code><i>current</i></code> 为底层迭代器。</p>
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<p>此函数对通常<a href="cpp-language-unqualified_lookup.html">无限定</a>或<a href="cpp-language-qualified_lookup.html">有限定查找</a>不可见，而只能在 <code><span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">counted_iterator</span><span class="sy1"><</span>I<span class="sy1">></span></span></span></code> 为参数的关联类时由<a href="cpp-language-adl.html">实参依赖查找</a>找到。</p>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
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<table class="t-par-begin">
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<tr class="t-par">
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<td>i</td>
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<td>-</td>
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<td>源迭代器适配器</td>
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</tr>
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</table>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
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<p>右值引用或纯右值临时量。</p>
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<h3><span class="mw-headline" id=".E5.A4.8D.E6.9D.82.E5.BA.A6">复杂度</span></h3>
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<p>常数。</p>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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<div class="t-example">
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<div class="t-example-live-link"></div>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="cpp source-cpp">
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<pre class="de1"><span class="co2">#include <iomanip></span>
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<span class="co2">#include <iostream></span>
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<span class="co2">#include <iterator></span>
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<span class="co2">#include <string></span>
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<span class="co2">#include <vector></span>
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<span class="kw4">void</span> print<span class="br0">(</span><span class="kw4">auto</span> <span class="kw4">const</span><span class="sy3">&</span> rem, <span class="kw4">auto</span> <span class="kw4">const</span><span class="sy3">&</span> v<span class="br0">)</span> <span class="br0">{</span>
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<span class="kw1">for</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"><<</span> rem <span class="sy1"><<</span> <span class="st0">"["</span> <span class="sy1"><<</span> size<span class="br0">(</span>v<span class="br0">)</span> <span class="sy1"><<</span> <span class="st0">"] { "</span><span class="sy4">;</span> <span class="kw4">auto</span> <span class="kw4">const</span><span class="sy3">&</span> s <span class="sy4">:</span> v<span class="br0">)</span>
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<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> quoted<span class="br0">(</span>s<span class="br0">)</span> <span class="sy1"><<</span> <span class="st0">" "</span><span class="sy4">;</span>
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<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"}<span class="es1">\n</span>"</span><span class="sy4">;</span>
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<span class="br0">}</span>
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<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
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<span class="br0">{</span>
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<a href="cpp-container-vector.html"><span class="kw1269">std::<span class="me2">vector</span></span></a><span class="sy1"><</span><a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a><span class="sy1">></span> p <span class="br0">{</span> <span class="st0">"Alpha"</span>, <span class="st0">"Bravo"</span>, <span class="st0">"Charlie"</span> <span class="br0">}</span>, q<span class="sy4">;</span>
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print<span class="br0">(</span><span class="st0">"p"</span>, p<span class="br0">)</span>, print<span class="br0">(</span><span class="st0">"q"</span>, q<span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">using</span> RI <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">counted_iterator</span><span class="sy1"><</span><a href="cpp-container-vector.html"><span class="kw1269">std::<span class="me2">vector</span></span></a><span class="sy1"><</span><a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a><span class="sy1">></span><span class="sy4">::</span><span class="me2">iterator</span><span class="sy1">></span><span class="sy4">;</span>
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<span class="kw1">for</span> <span class="br0">(</span>RI iter<span class="br0">{</span> p.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, <span class="nu0">2</span> <span class="br0">}</span><span class="sy4">;</span> iter <span class="sy3">!</span><span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">default_sentinel</span><span class="sy4">;</span> <span class="sy2">++</span>iter<span class="br0">)</span> <span class="br0">{</span>
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q.<span class="me1">emplace_back</span><span class="br0">(</span> <span class="coMULTI">/* ADL */</span> iter_move<span class="br0">(</span>iter<span class="br0">)</span> <span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span>
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print<span class="br0">(</span><span class="st0">"p"</span>, p<span class="br0">)</span>, print<span class="br0">(</span><span class="st0">"q"</span>, q<span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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</div>
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<p>可能的输出：</p>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="text source-text">
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<pre class="de1">p[3] { "Alpha" "Bravo" "Charlie" }
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q[0] { }
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p[3] { "" "" "Charlie" }
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q[2] { "Alpha" "Bravo" }</pre></div>
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</div>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<table class="t-dsc-begin">
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-iterator-ranges-iter_move.html"><span class="t-lines"><span>iter_move</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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</div>
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</td>
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<td>将解引用迭代器的结果转型为其关联的右值引用类型<br />
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<span class="t-mark">(定制点对象)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-iterator-counted_iterator-iter_swap.html"><span class="t-lines"><span>iter_swap</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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</div>
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</td>
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<td>交换二个底层迭代器所指向的对象<br />
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<span class="t-mark">(函数模板)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-utility-move.html"><span class="t-lines"><span>move</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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</div>
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</td>
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<td>获得右值引用<br />
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<span class="t-mark">(函数模板)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-utility-move_if_noexcept.html"><span class="t-lines"><span>move_if_noexcept</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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</div>
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</td>
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<td>若移动构造函数不抛出则获得右值引用<br />
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<span class="t-mark">(函数模板)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-utility-forward.html"><span class="t-lines"><span>forward</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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</div>
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</td>
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<td>转发一个函数实参<br />
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<span class="t-mark">(函数模板)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-algorithm-ranges-move.html"><span class="t-lines"><span>ranges::move</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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</div>
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</td>
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<td>将某一范围的元素移动到一个新的位置<br />
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<span class="t-mark">(niebloid)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-algorithm-ranges-move_backward.html"><span class="t-lines"><span>ranges::move_backword</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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</div>
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</td>
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<td>按从后往前的顺序移动某一范围的元素到新的位置<br />
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<span class="t-mark">(niebloid)</span></td>
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</tr>
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</table>
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</div>
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<div class="visualClear"></div>
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</div>
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