// demofp2.cpp - demonstrate function pointers using typdef

#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

typedef void(*funPtr)();     // defines funPtr to be a pointer
                             // to a function with no args
void fun(funPtr fptr) {

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

void main() {

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

  funPtr 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";
}