Lecture
You can define a pointer to component-functions.
value_type (class_name :: * pointer_name_function) (function_paragraph spec);
Example 1.5.2
// Determine pointer to member function of class
double (complex:: * ptcom) ();
// Setting the pointer
ptcom = & complex:: real;
// Now for object A
complex A (5.2,2.7);
// you can call its function
cout << (A. * ptcom) ();
// If the real method determines the type of reference
double & real (void) {return re;}
// then using this method you can change the re field
(A. * ptcom) () = 7.9;
// In this case, the pointer is defined as
double & (complex:: * ptcom) ();
You can also determine the type of function pointer
typedef double & (complex :: * PF) ();
and then determine the pointer itself
PF ptcom = & complex :: real;
Comments