28 lines
732 B
Factor
28 lines
732 B
Factor
! Copyright (C) 2013 Doug Coleman.
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! See http://factorcode.org/license.txt for BSD license.
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USING: kernel locals sequences sequences.extras sets ;
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IN: sets.extras
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: setwise-xor ( seq1 seq2 -- set )
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[ append members ] [ intersect ] 2bi diff ;
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: symmetric-diff ( set1 set2 -- set )
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[ union ] [ intersect ] 2bi diff ;
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: proper-subset? ( set1 set2 -- ? )
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2dup subset? [ swap subset? not ] [ 2drop f ] if ;
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: superset? ( set1 set2 -- ? )
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swap subset? ;
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: disjoint? ( set1 set2 -- ? )
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intersects? not ;
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:: non-repeating ( seq -- seq' )
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HS{ } clone :> visited
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0 seq new-resizable :> accum
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seq [
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accum over visited ?adjoin
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[ push ] [ remove-first! drop ] if
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] each accum seq like ;
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