28 lines
836 B
Factor
28 lines
836 B
Factor
! Copyright (C) 2004, 2007 Slava Pestov.
|
|
! See http://factorcode.org/license.txt for BSD license.
|
|
USING: words sequences kernel assocs combinators classes
|
|
generic.standard namespaces arrays ;
|
|
IN: classes.union
|
|
|
|
PREDICATE: class union-class
|
|
"metaclass" word-prop union-class eq? ;
|
|
|
|
! Union classes for dispatch on multiple classes.
|
|
: union-predicate-quot ( members -- quot )
|
|
0 (dispatch#) [
|
|
[ [ drop t ] ] { } map>assoc
|
|
object bootstrap-word [ drop f ] 2array add*
|
|
single-combination
|
|
] with-variable ;
|
|
|
|
: define-union-predicate ( class -- )
|
|
dup predicate-word
|
|
over members union-predicate-quot
|
|
define-predicate ;
|
|
|
|
: define-union-class ( class members -- )
|
|
dupd f union-class define-class define-union-predicate ;
|
|
|
|
M: union-class reset-class
|
|
{ "metaclass" "members" } reset-props ;
|