NSMapTableKeyCallBacks
The function pointers used to configure behavior of NSMapTable with respect to key elements within a map table.
Declaration
struct NSMapTableKeyCallBacksOverview
All functions must know the types of things in the map table to be able to operate on them. Sets of predefined call backs are described in NSMapTable.
Two predefined values to use for notAKeyMarker are NSNotAnIntMapKey and NSNotAPointerMapKey.