📄 copy_backward.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head> <meta name="generator" content= "HTML Tidy for Linux/x86 (vers 1 September 2005), see www.w3.org"> <title>copy_backward</title> <link href="../cppreference.css" rel="stylesheet" type="text/css"></head><body><table> <tr> <td> <div class="body-content"> <div class="header-box"> <a href="../index.html">cppreference.com</a> > <a href= "index.html">C++ Algorithms</a> > <a href= "copy_backward.html">copy_backward</a> </div> <div class="name-format"> copy_backward </div> <div class="syntax-name-format"> Syntax: </div> <pre class="syntax-box"> #include <algorithm> iterator copy_backward( iterator start, iterator end, iterator dest );</pre> <p>copy_backward() is similar to (C++ Strings) <a href= "../cppstring/copy.html">copy</a>(), in that both functions copy elements from <em>start</em> to <em>end</em> to <em>dest</em>. The copy_backward() function , however, starts depositing elements at <em>dest</em> and then works backwards, such that:</p> <pre class="example-code"> *(dest-1) == *(end-1) *(dest-2) == *(end-2) *(dest-3) == *(end-3) ... *(dest-N) == *(end-N) </pre> <p>The following code uses copy_backward() to copy 10 integers into the end of an empty vector:</p> <pre class="example-code"> vector<int> from_vector; for( int i = 0; i < 10; i++ ) { from_vector.push_back( i ); } vector<int> to_vector(15); copy_backward( from_vector.begin(), from_vector.end(), to_vector.end() ); cout << "to_vector contains: "; for( unsigned int i = 0; i < to_vector.size(); i++ ) { cout << to_vector[i] << " "; } cout << endl; </pre> <p>The above code produces the following output:</p> <pre class="example-code"> to_vector contains: 0 0 0 0 0 0 1 2 3 4 5 6 7 8 9 </pre> <div class="related-name-format"> Related topics: </div> <div class="related-content"> <a href="copy.html">copy</a><br> <a href="copy_n.html">copy_n</a><br> <a href="swap.html">swap</a> </div> </div> </td> </tr> </table></body></html>⌨️ 快捷键说明
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