-
Each class derived from an interface has a small collection of static utility
methods (Code Sample 4)
-
The _nil() method returns a reference to the nil object for this type
-
The _duplicate() method is used for reference counting (garbage collection)
-
The _narrow() methods are safe casting operations
-
Because of potential loss of typing information (due to the IIOP specification)
a CORBA object may not be represented by a C++ instance of the most specific
type.
-
The _narrow() methods provide a way to test the type of the CORBA object and
recover a properly typed C++ object.
-
The last 3 methods are used to implement _narrow().
-
_narrow_helper() is essentially a static method (does not access instance
state), but must be declared as an instance method in order to be virtual
|