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DYNAMIC_DOWNCAST

Provides a handy way to cast a pointer to a pointer to a class object while checking to see if the cast is legal.

DYNAMIC_DOWNCAST(class, pointer )

class

The name of a class.

pointer

A pointer to be cast to a pointer to an object of type class.

The macro will cast the pointer parameter to a pointer to an object of the class parameter's type.

If the object referenced by the pointer is a "kind of" the identified class, the macro returns the appropriate pointer. If it is not a legal cast, the macro returns NULL.

Header: afx.h

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