On Dec 24, 2010, at 7:32 AM, beo wulf wrote:
> multi-methods vocab only shows parsing words
>
> GENERIC:
> M:
> METHOD:
>
> Those look like they only dispatch on one arg. What am I missing?
The version of GENERIC: from multi-methods defines methods with multiple
dispatch. The METHOD: syntax takes an array of dispatch types, as follows:
USING: multi-methods kernel ;
! override the default GENERIC: syntax with multi-methods GENERIC:
FROM: multi-methods => GENERIC: ;
SINGLETON: paper
SINGLETON: scissors
SINGLETON: rock
GENERIC: beats? ( obj1 obj2 -- ? )
METHOD: beats? { paper scissors } 2drop t ;
METHOD: beats? { scissors rock } 2drop t ;
METHOD: beats? { rock paper } 2drop t ;
METHOD: beats? { object object } 2drop f ;
Unfortunately, it looks like the vocabulary isn't fully documented; however,
you can see additional examples under extra/multi-methods/tests/ .
-Joe------------------------------------------------------------------------------
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