39 lines
844 B
Factor
39 lines
844 B
Factor
! Copyright (C) 2011 Doug Coleman.
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! See http://factorcode.org/license.txt for BSD license.
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USING: accessors arrays classes classes.algebra
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classes.algebra.private classes.private classes.union.private
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kernel words ;
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IN: classes.maybe
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TUPLE: maybe { class classoid initial: object read-only } ;
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C: <maybe> maybe
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INSTANCE: maybe classoid
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M: maybe instance?
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over [ class>> instance? ] [ 2drop t ] if ;
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: maybe-class-or ( maybe -- classoid )
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class>> \ f class-or ;
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M: maybe normalize-class
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maybe-class-or ;
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M: maybe rank-class drop 6 ;
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M: maybe (flatten-class)
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maybe-class-or (flatten-class) ;
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M: maybe union-of-builtins?
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class>> union-of-builtins? ;
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M: maybe class-name
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class>> class-name ;
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M: maybe predicate-def
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class>> predicate-def [ [ t ] if* ] curry ;
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M: maybe contained-classes
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class>> 1array ;
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