How to check if a void* pointer can be safely cast to something else?

Question

Let\'s say I have this function, which is part of some gui toolkit:

typedef struct _My_Struct My_Struct;
/* struct ... */

void paint_handler( void* data )
{         


        

Answer 1

I know the question is 3 years old but here I go, How about using a simple global enum to distinguish where the function is called from. then you can switch between what type to cast the void pointer to.