using functions with pointers cpp code example
Example 1: Function pointer C++
void one() { cout << "One\n"; }
void two() { cout << "Two\n"; }
int main()
{
void (*fptr)(); //Declare a function pointer to voids with no params
fptr = &one; //fptr -> one
*fptr(); //=> one()
fptr = &two; //fptr -> two
*fptr(); //=> two()
return 0;
}
Example 2: c function pointer
//Declaration of a pointer to a function that takes an integer
//and returns an integer.
int (*f_ptr)(int);
//Assignment of a function foo to the function pointer f_ptr declared above.
f_ptr = foo;
//Calling foo indirectly via f_ptr, passing the return value of foo to r.
int r = f_ptr(v);
//Assigning an address of a function to the function pointer f_ptr,
//then calling foo by dereferencing the function pointer.
f_ptr = &foo;
int r = (*f_ptr)(v);