#define RTS_OK							0
#define RTS_ERROR						99


#define RTS_EMPTY						1	//an element can't be deleted if it contains no data
#define RTS_INVALID_ID					2	//an object with this identifier does not exist
#define RTS_INVALID_CONSTANT			3	//an invalid constant passed as a parameter

//objects
#define RTS_END_OBJECT					4	//reached the end of an object's elements

//utility constants
#define RTS_NULL								0

#define RTS_NO_INTERSECTION				1	//there is no intersection in intersection calculations