📄 for_each.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>for_each</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= "for_each.html">for_each</a> </div> <div class="name-format"> for_each </div> <div class="syntax-name-format"> Syntax: </div> <pre class="syntax-box"> #include <algorithm> UnaryFunction for_each( iterator start, iterator end, UnaryFunction f );</pre> <p>The for_each() algorithm applies the function <em>f</em> to each of the elements between <em>start</em> and <em>end</em>. The return value of for_each() is <em>f</em>.</p> <p>For example, the following code snippets define a unary function then use it to increment all of the elements of an array:</p> <pre class="example-code"> template<class <a href="../containers.html">TYPE</a>> struct increment : public unary_function<<a href="../containers.html">TYPE</a>, void> { void operator() (<a href="../containers.html">TYPE</a>& x) { x++; } }; ... int nums[] = {3, 4, 2, 9, 15, 267}; const int N = 6; cout << "Before, nums[] is: "; for( int i = 0; i < N; i++ ) { cout << nums[i] << " "; } cout << endl; for_each( nums, nums + N, increment<int>() ); cout << "After, nums[] is: "; for( int i = 0; i < N; i++ ) { cout << nums[i] << " "; } cout << endl; </pre> <p>The above code displays the following output:</p> <pre class="example-code"> Before, nums[] is: 3 4 2 9 15 267 After, nums[] is: 4 5 3 10 16 268 </pre> </div> </td> </tr> </table></body></html>⌨️ 快捷键说明
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