for each c 2b 2b

1// for_each example
2#include <iostream>     // std::cout
3#include <algorithm>    // std::for_each
4#include <vector>       // std::vector
5
6void myfunction (int i) {  // function:
7  std::cout << ' ' << i;
8}
9
10struct myclass {           // function object type:
11  void operator() (int i) {std::cout << ' ' << i;}
12} myobject;
13
14int main () {
15  std::vector<int> myvector;
16  myvector.push_back(10);
17  myvector.push_back(20);
18  myvector.push_back(30);
19
20  std::cout << "myvector contains:";
21  for_each (myvector.begin(), myvector.end(), myfunction);
22  std::cout << '\n';
23
24  // or:
25  std::cout << "myvector contains:";
26  for_each (myvector.begin(), myvector.end(), myobject);
27  std::cout << '\n';
28
29  return 0;
30}

1for_each( InputIt first, InputIt last, UnaryFunction f );
2//Example
3vector<int> v{ 1, 2, 3, 4, 5 };
4for_each(v.begin(), v.end(), [](int i) { cout<<i<<" "<<endl; });
5

1template<class InputIterator, class Function>
2  Function for_each(InputIterator first, InputIterator last, Function fn)
3{
4  while (first!=last) {
5    fn (*first);
6    ++first;
7  }
8  return fn;      // or, since C++11: return move(fn);
9}