algorithm中for_each用于遍歷和執行一些事情，如下代碼將打印1-7：
#include<iostream>#include<vector>#include<algorithm>using namespace std;template <typename T>class PRint{public: void Operator()(const T&elem) { cout<<elem<<endl; }};int main(){ int a[]={1,2,3,4,5,6,7}; vector<int> v(a,a+7); for_each(v.begin(),v.end(),print<int>())//print傳入的是函數指針，for_each內部會將迭代器傳入函數指針，作為參數運算 ; return 0;}algorithm中for_each實現，代碼來自：http://www.cplusplus.com/reference/algorithm/for_each/
template<class InputIterator, class Function> Function for_each(InputIterator first, InputIterator last, Function fn){ while (first!=last) { fn (*first); ++first; } return fn; // or, since C++11: return move(fn);}新聞熱點
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