Functors(Function objects) demo

functors.cc

// A functor is any object that can be used with () in the manner of a function.
// includes pointers to functions, and class objects for which the () operator (function call operator) is overloaded


#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

class Print {
 public:
  void operator() (int elem) const {
    cout << elem << " ";
  }
};

int main() {
  vector<int> vect;
  for (int i = 1; i < 10; i++) {
    vect.push_back(i);
  }

  Print print_it;
  for_each(vect.begin(), vect.end(), print_it);
  cout << endl;
  return 0;
}