AcHeapOperators AcDbGraph AcDbObjectIdGraph
class AcDbObjectIdGraph : public AcDbGraph;
idgraph.h
AcDbObjectIdGraph is derived from AcDbGraph and is used to represent the relationship of object IDs to one another. This class is used by the one pass purge method (AcDbDatabase::purge(AcDbObjectIdGraph& idGraph)) to represent the references from one object ID to another.