AcRxObject AcGiDrawable AcHeapOperators AcDbObject AcDbFilter AcDbLayerFilter AcDbSpatialFilter
class AcDbFilter : public AcDbObject;
dbfilter.h
This class defines a "query." It provides the "key" to the AcDbCompositeFilteredBlockIterator, for which the corresponding index is obtained through the indexClass() method.
The AcDbSpatialFilter::indexClass() method will return AcDbSpatialIndex::desc().
Applications that need to provide their own indexing scheme need to provide versions of these three classes:
AcDbIndexFilterManager, AcDbIndex