Interface extensions and default interface implementations

Elements Oxygene
1

In the Blog post about the new V9.0 of Elements is something mentioned about " interface extensions and default interface implementations"
Where can I find more info about this? I use Interface delegation all the time to create mix-ins so I am very interested.

2

You can do something like this:

type
  IMyInterface = public interface
    method Test;
  end;
  MyInterfaceExtension = public extension class(IMyInterface)
  public
   method Test;
    begin
      raise new NotSupportedException('Not supported yet!');
    end;
  end;

Then if a class does NOT implement Test, it will call the default one, from the extension.

2 Likes