AcRxOverrule AcDbOsnapOverrule
class AcDbOsnapOverrule : public AcRxOverrule;
dbentityoverrule.h
AcDbOsnapOverrule overrules a subset of osnap related operations that the AcDbEntity class specifies. It is intended as a base class for clients who want to alter some or all behavior of a given AcDbEntity-derived class. At the base level, each default implementation simply calls the corresponding method in the target class.