Pointers to functions
C++ allows operations with pointers to functions. The typical use of this is for passing a
function as an argument to another function. Pointers to functions are declared with the
same syntax as a regular function declaration, except that the name of the function is
enclosed between parentheses () and an asterisk (*) is inserted before the name:
// pointer to functions
#include <iostream>
using namespace std;
int addition (int a, int b)
{ return (a+b); }
int subtraction (int a, int b)
{ return (a-b); }
int operation (int x, int y, int (*functocall)(int,int))
{
int g;
g = (*functocall)(x,y);
return (g);
}
int main ()
{
int m,n;
int (*minus)(int,int) = subtraction;
m = operation (7, 5, addition);
n = operation (20, m, minus);
cout <<n;
return 0;
}
1
2
3
4
5
6
7
void one() { cout << "One\n"; }
void two() { cout << "Two\n"; }
int main()
{
void (*fptr)(); //Declare a function pointer to voids with no params
