AcDbFilter

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:

• AcDbIndex
• AcDbFilter
• AcDbFilteredBlockIterator

AcDbIndexFilterManager, AcDbIndex