// demofp1.cpp - demonstrate function pointers

#include <iostream>
using namespace std;

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

// define a function taking a function pointer argument

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

  cout << " fun calling ";
  (*fptr)();               // invoke the function pointed to
}

int main() {

  cout << "\n\ndemonstration of 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

  cout << "\n\n";
  return 0;
}