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Postings from April 2003
> From: Damian Conway [mailto:damian@conway.org] > >> my Oak $tree = Dog.new(); > >> my Dog $spot = Oak.new(); > > > > > > Why is that a problem? > > Because the bark() method of a tree has *nothing* to do with the > bark() method of a dog. And is most unlikely to be interchangeable with it. > They just happen to be *named* with the same word. Right. To me, that's a strong feature of Luke's scheme: You don't have to "inherit" something to be able to do it. Under the "you must inherit" scheme, we're essentially saying "We know more than you about what you need." To me, that's questionable. Under the interface scheme, we're saying "You know more than we do about what you need." That's questionable, too :-) but it's more Perlish. > Appearance (i.e. interface) doesn't make a one thing substitutable for > another; genetics (i.e. inheritance) does. There's no way that my mom's 8-track player and my computer's CD drive are related to each other, and yet they have the same interface: insert, skip, eject. > Not that I'm saying Perl 6 shouldn't support interface polymorphism. It > should. But its only an alternative to, not a replacement for, > inheritance. So when's A12 coming out? :-) =AustinThread Previous | Thread Next