1 /* @(#)grem2.h 1.2 04/18/83 2 * This is an include file for database macros. 3 */ 4 #define DBNextElt(elt) elt->nextelt 5 #define DBNextofSet(elt) elt->setnext 6 #define DBNullelt(elt) ( elt == NULL ) 7 #define Nullpoint(pt) ( pt->x == nullpt ) 8 #define PTNextPoint(pt) pt->nextpt 9