Because it's const void *pa, you don't need the cast. A void * pointer will convert to any other kind of pointer. Now you only need to mention the type once. (I

Because it's const void *pa, you don't need the cast. A void * pointer will convert to any other kind of pointer. Now you only need to mention the type once. (I forget the const-related rules, but since the consts match in this case I don't think it'll be relevant.)