Polymorphic Behavior in VB6
- by Tom Tresansky
I recently noticed the CallByName keyword in VB6.
Since this takes a object, procedure name, "call type" and arguments array, can this be used to "fake" some types of polymorphic behavior?
I can make 2 classes, class A and B, each with the same method Foo, and do:
Dim list As New Collection
Dim instanceA As New ClassA
Dim instanceB As New ClassB
Dim current As Object
Call list.Add(instanceA)
Call list.Add(instanceB)
For Each current in list
Call CallByName(current, "methodName", vbMethod)
Next
Anyone done this before? Problems? Horrible idea or genius idea? Implications? Unintended consequences?
