Property :: instanceArea - Provide instance area

The function provides the instance area for a selected property instance. When no instance is selected for a single reference, the function provides an initialized area. When no instance is selected in the upper property handle or when no instance is selected in a collection handle the function throws an exception.

When a selected instance could be provided in the property handle, the function checks, whether the type of the selected instance fits to the type name passed in sTypeName . When the instance does not inherit from the type passed, the function throws an exception, too.

The function can be called from C++ functions, only. It is mainly used by the operator -> in the SET template class.