#ifndef FUNCTOR_H
#define FUNCTOR_H

#include <string>
#include <iostream>
template<typename T>
struct base{
  bool operator()(int i)const {
    return static_cast< const T&>(*this)(i);
  }
};
struct F1:public base<F1>{
  bool operator()(int i) const{
    return true;
  }
};
struct F2:public base<F2>{
  bool operator()(int i) const{
    return true;
  }
};
struct F3 :public base<F3>{
  std::string junk_;
  F3(std::string junk):junk_(junk){}
  bool operator()(int i) const{
    std::cout << junk_ << std::endl;
    return false;
  }
};
#endif