275 lines
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275 lines
24 KiB
HTML
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<title>std::ranges::move_backward, std::ranges::move_backward_result</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_algorithm_ranges_move_backward 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::ranges::</span>move_backward, <span style="font-size:0.7em; line-height:130%">std::ranges::</span>move_backward_result</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-algorithm.html">algorithm</a>‎ | <a href="cpp-algorithm-ranges.html">ranges</a></span></div>
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<div>定义于头文件 <code><a href="cpp-header-algorithm.html"><algorithm></a></code></div>
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<td></td>
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<div>调用签名</div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> std<span class="sy4">::</span><span class="me2">bidirectional_iterator</span> I1, std<span class="sy4">::</span><span class="me2">sentinel_for</span><span class="sy1"><</span>I1<span class="sy1">></span> S1,<br /></span>
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<p> std<span class="sy4">::</span><span class="me2">bidirectional_iterator</span> I2 <span class="sy1">></span><br />
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requires std<span class="sy4">::</span><span class="me2">indirectly_movable</span><span class="sy1"><</span>I1, I2<span class="sy1">></span><br />
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<span class="kw4">constexpr</span> move_backward_result<span class="sy1"><</span>I1, I2<span class="sy1">></span><br /></p>
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move_backward<span class="br0">(</span> I1 first, S1 last, I2 result <span class="br0">)</span><span class="sy4">;</span></div>
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</td>
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<td>(1)</td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> ranges<span class="sy4">::</span><span class="me2">bidirectional_range</span> R, std<span class="sy4">::</span><span class="me2">bidirectional_iterator</span> I <span class="sy1">></span><br /></span>
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<p>requires std<span class="sy4">::</span><span class="me2">indirectly_movable</span><span class="sy1"><</span>ranges<span class="sy4">::</span><span class="me2">iterator_t</span><span class="sy1"><</span>R<span class="sy1">></span>, I<span class="sy1">></span><br />
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<span class="kw4">constexpr</span> move_backward_result<span class="sy1"><</span>ranges<span class="sy4">::</span><span class="me2">borrowed_iterator_t</span><span class="sy1"><</span>R<span class="sy1">></span>, I<span class="sy1">></span><br /></p>
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move_backward<span class="br0">(</span> R<span class="sy3">&&</span> r, I result <span class="br0">)</span><span class="sy4">;</span></div>
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<td>(2)</td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<div>辅助类型</div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span> I, <span class="kw1">class</span> O <span class="sy1">></span><br />
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<span class="kw1">using</span> move_backward_result <span class="sy1">=</span> ranges<span class="sy4">::</span><span class="me2">in_out_result</span><span class="sy1"><</span>I, O<span class="sy1">></span><span class="sy4">;</span></span></div>
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<td>(3)</td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<div class="t-li1"><span class="t-li">1)</span> 从 <code>[first, last)</code> 所定义的范围移动元素到另一范围 <code>[result - N, result)</code> ，其中 <span class="t-c"><span class="mw-geshi cpp source-cpp">N <span class="sy1">=</span> ranges<span class="sy4">::</span><span class="me2">distance</span><span class="br0">(</span>first, last<span class="br0">)</span></span></span> 。按逆序移动元素（首先移动末元素），但保持其相对顺序。若 <code>result</code> 在 <code><b>(</b>first, last<b>]</b></code> 内则行为未定义。此情况下可用 <span class="t-lc">ranges::move</span> 代替。</div>
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<div class="t-li1"><span class="t-li">2)</span> 同 <span class="t-v">(1)</span> ，但以 <code>r</code> 为源范围，如同以 <span class="t-c"><span class="mw-geshi cpp source-cpp">ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>r<span class="br0">)</span></span></span> 为 <code>first</code> 并以 <span class="t-c"><span class="mw-geshi cpp source-cpp">ranges<span class="sy4">::</span><span class="me2">end</span><span class="br0">(</span>r<span class="br0">)</span></span></span> 为 <code>last</code> 。</div>
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<p><i>被移动</i>的范围的元素将仍然含有适当类型的合法值，但不必为与移动前相同的值，如同对每个 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">0</span> ≤ n <span class="sy1"><</span> N</span></span> 中的整数 <code>n</code> 使用 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span><span class="br0">(</span>result <span class="sy2">-</span> n<span class="br0">)</span> <span class="sy1">=</span> ranges<span class="sy4">::</span><span class="me2">iter_move</span><span class="br0">(</span>last <span class="sy2">-</span> n<span class="br0">)</span></span></span> 。</p>
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<p>此页面上描述的仿函数实体是 <i>niebloid</i> ，即：</p>
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<ul>
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<li>调用它们中的任何一者时不可指定显式模板实参。</li>
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<li>它们无一对<a href="cpp-language-adl.html">实参依赖查找</a>可见。</li>
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<li>在<a href="cpp-language-unqualified_lookup.html">通常无限定查找</a>寻找函数调用运算符左侧的名称找到它们之一时，它禁止<a href="cpp-language-adl.html">实参依赖查找</a>。</li>
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</ul>
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<p>实际上，它们能以函数对象，或以某些特殊编译器扩展实现。</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>first</td>
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<td>-</td>
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<td>要移动的元素范围的起始</td>
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</tr>
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<tr class="t-par">
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<td>last</td>
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<td>-</td>
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<td>要移动元素范围的末尾</td>
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</tr>
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<tr class="t-par">
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<td>r</td>
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<td>-</td>
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<td>要移动的元素范围</td>
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</tr>
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<tr class="t-par">
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<td>result</td>
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<td>-</td>
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<td>目标范围的末尾</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><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="br0">{</span>last, result <span class="sy2">-</span> N<span class="br0">}</span></span></span> 。</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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<div class="t-li1"><span class="t-li">1)</span> 准确移动赋值 <span class="t-c"><span class="mw-geshi cpp source-cpp">N</span></span> 次。</div>
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<div class="t-li1"><span class="t-li">2)</span> 准确移动赋值 <span class="t-c"><span class="mw-geshi cpp source-cpp">ranges<span class="sy4">::</span><span class="me2">distance</span><span class="br0">(</span>r<span class="br0">)</span></span></span> 次。</div>
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<h3><span class="mw-headline" id=".E6.B3.A8.E8.A7.A3">注解</span></h3>
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<p>移动重叠的范围时， <span class="t-lc">ranges::move</span> 适合向左移动（目标范围的起始在源范围外），而 <code>ranges::move_backward</code> 适合向右移动（目标范围的末尾在源范围外）。</p>
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<h3><span class="mw-headline" id=".E5.8F.AF.E8.83.BD.E7.9A.84.E5.AE.9E.E7.8E.B0">可能的实现</span></h3>
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<table class="eq-fun-cpp-table">
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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="kw1">struct</span> move_backward_fn <span class="br0">{</span>
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<span class="kw1">template</span><span class="sy1"><</span>std<span class="sy4">::</span><span class="me2">bidirectional_iterator</span> I1, std<span class="sy4">::</span><span class="me2">sentinel_for</span><span class="sy1"><</span>I1<span class="sy1">></span> S1,
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std<span class="sy4">::</span><span class="me2">bidirectional_iterator</span> I2<span class="sy1">></span>
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requires std<span class="sy4">::</span><span class="me2">indirectly_movable</span><span class="sy1"><</span>I1, I2<span class="sy1">></span>
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<span class="kw4">constexpr</span> ranges<span class="sy4">::</span><span class="me2">move_backward_result</span><span class="sy1"><</span>I1, I2<span class="sy1">></span>
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operator<span class="br0">(</span><span class="br0">)</span><span class="br0">(</span> I1 first, S1 last, I2 result <span class="br0">)</span> <span class="kw4">const</span> <span class="br0">{</span>
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<span class="kw4">auto</span> i <span class="br0">{</span>last<span class="br0">}</span><span class="sy4">;</span>
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<span class="kw1">for</span> <span class="br0">(</span><span class="sy4">;</span> i <span class="sy3">!</span><span class="sy1">=</span> first<span class="sy4">;</span> <span class="sy2">*--</span>result <span class="sy1">=</span> ranges<span class="sy4">::</span><span class="me2">iter_move</span><span class="br0">(</span><span class="sy2">--</span>i<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">return</span> <span class="br0">{</span>std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>last<span class="br0">)</span>, std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>result<span class="br0">)</span><span class="br0">}</span><span class="sy4">;</span>
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<span class="br0">}</span>
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<span class="kw1">template</span><span class="sy1"><</span>ranges<span class="sy4">::</span><span class="me2">bidirectional_range</span> R, std<span class="sy4">::</span><span class="me2">bidirectional_iterator</span> I<span class="sy1">></span>
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requires std<span class="sy4">::</span><span class="me2">indirectly_movable</span><span class="sy1"><</span>ranges<span class="sy4">::</span><span class="me2">iterator_t</span><span class="sy1"><</span>R<span class="sy1">></span>, I<span class="sy1">></span>
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<span class="kw4">constexpr</span> ranges<span class="sy4">::</span><span class="me2">move_backward_result</span><span class="sy1"><</span>ranges<span class="sy4">::</span><span class="me2">borrowed_iterator_t</span><span class="sy1"><</span>R<span class="sy1">></span>, I<span class="sy1">></span>
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operator<span class="br0">(</span><span class="br0">)</span><span class="br0">(</span> R<span class="sy3">&&</span> r, I result <span class="br0">)</span> <span class="kw4">const</span> <span class="br0">{</span>
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<span class="kw1">return</span> <span class="br0">(</span><span class="sy2">*</span>this<span class="br0">)</span><span class="br0">(</span>ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>r<span class="br0">)</span>, ranges<span class="sy4">::</span><span class="me2">end</span><span class="br0">(</span>r<span class="br0">)</span>, std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>result<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span>
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<span class="br0">}</span><span class="sy4">;</span>
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<span class="kw1">inline</span> <span class="kw4">constexpr</span> move_backward_fn move_backward<span class="br0">{</span><span class="br0">}</span><span class="sy4">;</span></pre></div>
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</div>
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</table>
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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 <algorithm></span>
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<span class="co2">#include <iostream></span>
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<span class="co2">#include <string></span>
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<span class="co2">#include <string_view></span>
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<span class="co2">#include <vector></span>
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<span class="kw1">using</span> Vec <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>
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<span class="kw4">void</span> print<span class="br0">(</span><a href="cpp-string-basic_string_view.html"><span class="kw1248">std::<span class="me2">string_view</span></span></a> rem, Vec <span class="kw4">const</span><span class="sy3">&</span> vec<span class="br0">)</span> <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> rem <span class="sy1"><<</span> <span class="st0">"["</span> <span class="sy1"><<</span> vec.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1"><<</span> <span class="st0">"]: "</span><span class="sy4">;</span>
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<span class="kw1">for</span> <span class="br0">(</span><span class="kw4">const</span> <a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a><span class="sy3">&</span> s <span class="sy4">:</span> vec<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> <span class="br0">(</span>s.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span> <span class="sy4">?</span> s <span class="sy4">:</span> <a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a><span class="br0">{</span><span class="st0">"·"</span><span class="br0">}</span><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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Vec a<span class="br0">{</span><span class="st0">"▁"</span>, <span class="st0">"▂"</span>, <span class="st0">"▃"</span>, <span class="st0">"▄"</span>, <span class="st0">"▅"</span>, <span class="st0">"▆"</span>, <span class="st0">"▇"</span>, <span class="st0">"█"</span><span class="br0">}</span><span class="sy4">;</span>
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Vec b<span class="br0">(</span>a.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
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print<span class="br0">(</span><span class="st0">"Before move:<span class="es1">\n</span>"</span> <span class="st0">"a"</span>, a<span class="br0">)</span><span class="sy4">;</span>
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print<span class="br0">(</span><span class="st0">"b"</span>, b<span class="br0">)</span><span class="sy4">;</span>
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std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">move_backward</span><span class="br0">(</span>a, b.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
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print<span class="br0">(</span><span class="st0">"<span class="es1">\n</span>"</span> <span class="st0">"Move a >> b:<span class="es1">\n</span>"</span> <span class="st0">"a"</span>, a<span class="br0">)</span><span class="sy4">;</span>
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print<span class="br0">(</span><span class="st0">"b"</span>, b<span class="br0">)</span><span class="sy4">;</span>
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std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">move_backward</span><span class="br0">(</span>b.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, b.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span>, a.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
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print<span class="br0">(</span><span class="st0">"<span class="es1">\n</span>"</span> <span class="st0">"Move b >> a:<span class="es1">\n</span>"</span> <span class="st0">"a"</span>, a<span class="br0">)</span><span class="sy4">;</span>
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print<span class="br0">(</span><span class="st0">"b"</span>, b<span class="br0">)</span><span class="sy4">;</span>
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std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">move_backward</span><span class="br0">(</span>a.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, a.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span><span class="sy2">+</span><span class="nu0">3</span>, a.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
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print<span class="br0">(</span><span class="st0">"<span class="es1">\n</span>"</span> <span class="st0">"Overlapping move a[0, 3) >> a[5, 8):<span class="es1">\n</span>"</span> <span class="st0">"a"</span>, a<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">Before move:
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a[8]: ▁ ▂ ▃ ▄ ▅ ▆ ▇ █
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b[8]: · · · · · · · ·
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|
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Move a >> b:
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a[8]: · · · · · · · ·
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b[8]: ▁ ▂ ▃ ▄ ▅ ▆ ▇ █
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|
|
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Move b >> a:
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a[8]: ▁ ▂ ▃ ▄ ▅ ▆ ▇ █
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b[8]: · · · · · · · ·
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|
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Overlapping move a[0, 3) >> a[5, 8):
|
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a[8]: · · · ▄ ▅ ▁ ▂ ▃</pre></div>
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</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-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-copy.html"><span class="t-lines"><span>ranges::copy</span><span>ranges::copy_if</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><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>将某一范围的元素复制到一个新的位置<br />
|
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<span class="t-mark">(niebloid)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-algorithm-ranges-copy_backward.html"><span class="t-lines"><span>ranges::copy_backward</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>
|
|
</div>
|
|
</td>
|
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<td>按从后往前的顺序复制一个范围内的元素<br />
|
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<span class="t-mark">(niebloid)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-algorithm-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>
|
|
</div>
|
|
</td>
|
|
<td>将某一范围的元素移动到一个新的位置<br />
|
|
<span class="t-mark">(函数模板)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-utility-move.html"><span class="t-lines"><span>move</span></span></a></div>
|
|
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
|
|
</div>
|
|
</td>
|
|
<td>获得右值引用<br />
|
|
<span class="t-mark">(函数模板)</span></td>
|
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</tr>
|
|
</table>
|
|
</div>
|
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<div class="visualClear"></div>
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</div>
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</div>
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</div>
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</body>
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</html>
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