On Tue, 2004-03-16 at 11:46, Dan Sugalski wrote:
A class >does< X if X is on the does list of the class or any of the parents of the class. This class then does the role X.
A class >isa< X if X in on the isa list of the class or any of the parents of the class.
Alternately, your class can just declare that it does X and thus *only* put X on its does list. Then that class or any child class is noted as doing X, without actually being an X.
As long as there are separate does and isa lists, it can work right.
Just to be sure, if Class Y inherits from Class X, is X on Y's does list?
If class X does X, then yes. (I *really* should've picked better names) Classes don't by default do themselves, so if you had a top-level class Foo that didn't mark itself as doing anything, an object of class Foo would return true for an isa('Foo') check but false for a does('Foo') check.
Classes and roles don't automatically share the same namespace.
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Dan Sugalski even samurai
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