C++
AcDbObject();
Description
The AcDbObject class is designed to be a base class only. For design reasons it was not possible to make it an abstract base class. So, instead, the constructor is protected so that it is not possible to instantiate AcDbObject objects.
Note
A newly created instance of any class derived from AcDbObject will not reside in any database. It is considered opened AcDb::kForWrite(), so isWriteEnabled() and isReadEnabled() returns Adesk::kTrue, but isNotifyEnabled() return Adesk::kFalse.