On Tue, 12 Apr 2011, Andreas Dorn wrote:
On Fri, 8 Apr 2011,michael.vancanneyt worte:
The whole idea of interfaces is to avoid multiple inheritance.
Hm. I don't believe that.
One of the major points of interfaces is indeed to avoid the problems
of multiple class inheritance (diamond problems - i.e. problems caused by
conflicting implementations of a method in different ancestor classes).
But Interfaces themselves don't have an implementation, so those
diamond problems simply don't exist for them.
Of course they do. If they inherit from 2 interfaces that have the same
method with a different signature, you have a problem.
InterfaceA = Interface
Function IsValid : Integer;
end;
InterfaceB = Interface
Function IsValid : String;
end;
How to define :
InterfaceC = Interface(InterfaceA,InterfaceB)
Michael.
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