Delegation is distinct from interfaces & far more powerful. It is
part of the runtime as you mentioned, but Cocoa==Obj-C like
JavaVM==Java. Java actually took the concept of interfaces from
Objective-C where they are called protocols.
I never said that delegation and interfaces are the same thing. I
said that delegation can be implemented using interfaces.
IMHO, Interfaces are a poor way to implement delegation; once fixed
they cannot be easily extended without breaking client code.
Well interfaces are just really the poor man's multiple inheritance,
although the argument for interfaces and against MI is claimed to be
theoretical. Thing is that, like Karl says, if you want to add
something to the interface then every implementing class has to be
changed. In practice, it would be much easier, to add to a real class
a default method, so that implementing classes would not be affected.
Ian
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