Object Oriented Programming with C++, Second Edition

12.7 POINTER TO FUNCTION

C++ allows us to define pointers to functions. Consider the following declaration:

int (*p)( int *a, int n ) ;

This declaration defines a pointer p to a function. It can point to any function satisfying the following conditions:

1. Return type of the function is int.
2. Function should have two parameters. First parameter should be pointer to int, second should be int.

In general terms, when you declare a pointer to a function, it is capable of pointing to any function with two conditions:

1. Return type should be as specified
2. The signature of the function should be identical to the declaration.

A program may have several such functions. The pointer p can point to any one of them at a given time. We can associate the pointer ...