// demofp1.cpp - demonstrate function pointers

#include <iostream>

void fun1() { std::cout << "fun1()\n"; }
void fun2() { std::cout << "fun2()\n"; }
void fun3() { std::cout << "fun3()\n"; }

// define a function taking a function pointer argument

void fun(void(*fptr)()) {

  std::cout << "  fun calling ";
  fptr();                  // invoke function pointed to
                           // (*fptr)(); equiv syntax
}

void main() {

  std::cout << "\n  Demonstrate callbacks\n\n";

  void (*callback[3])();   // declare an array of function pointers
                           // with the same signatures as fun1,...
  callback[0] = fun1;
  callback[1] = fun2;
  callback[2] = fun3;

  for (int i=0; i<3; i++)
    fun(callback[i]);      // pass the function pointer argument

  std::cout << "\n";
}