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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);}

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// for_each example#include <iostream>// std::cout#include <algorithm>// std::for_each#include <vector>// std::vectorvoid myfunction (int i) {// function:  std::cout <<' ' << i;}struct myclass {// function object type:voidoperator() (int i) {std::cout <<' ' << i;}} myobject;int main () {  std::vector<int> myvector;  myvector.push_back(10);  myvector.push_back(20);  myvector.push_back(30);  std::cout <<"myvector contains:";  for_each (myvector.begin(), myvector.end(), myfunction);  std::cout <<'\n';// or:  std::cout <<"myvector contains:";  for_each (myvector.begin(), myvector.end(), myobject);  std::cout <<'\n';return 0;}

myvector contains: 10 20 30myvector contains: 10 20 30