C++
AcDbXrefObjectId();
Description
Default constructor. Without being given the XREF or handle information, it assumes they are null values. Therefore, an object created with this constructor will return false from its isValid() method.
AcDbXrefObjectId();
Default constructor. Without being given the XREF or handle information, it assumes they are null values. Therefore, an object created with this constructor will return false from its isValid() method.