On Dec 16, 2010, at 10:28 PM, Jim mack wrote:
> I haven't figured out how to debug/step into inheritance chains/method order
> choosing.
bro2 is both a member of power1 (through "dad") and power2. There's no
hierarchical relationship implied between "power1" and "power2" (both classes
are open union classes and neither class is necessarily a subset of the other),
so when you invoke "content" on a bro2, it's ambiguous as to whether the
"power1" or "power2" method should be called. In ambiguous cases, the
union/mixin dispatch currently dispatches on the first asciibetical class for
which it finds a method, in this case "power1". To get the behavior you want,
you need to make power2 a member of power1, thereby mirroring the tuple
inheritance hierarchy in the mixin hierarchy:
MIXIN: power1
MIXIN: power2
TUPLE: dad ;
TUPLE: bro1 < dad ;
TUPLE: bro2 < dad ;
INSTANCE: power2 power1
INSTANCE: dad power1
INSTANCE: bro2 power2
Since "power2" is now explicitly a subset of "power1" it will be treated as
more specific, and "power2" methods will override "power1" methods.
-Joe
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