40 lines
1.1 KiB
Factor
40 lines
1.1 KiB
Factor
! Copyright (C) 2010 Daniel Ehrenberg
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! See http://factorcode.org/license.txt for BSD license.
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USING: accessors assocs hashtables kernel sets
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sequences parser ;
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IN: hash-sets
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! In a better implementation, less memory would be used
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TUPLE: hash-set { table hashtable read-only } ;
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: <hash-set> ( members -- hash-set )
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unique hash-set boa ; inline
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INSTANCE: hash-set set
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M: hash-set in? table>> key? ; inline
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M: hash-set adjoin table>> dupd set-at ; inline
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M: hash-set delete table>> delete-at ; inline
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M: hash-set members table>> keys ; inline
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M: hash-set set-like drop dup hash-set? [ members <hash-set> ] unless ;
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M: hash-set clone table>> clone hash-set boa ;
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M: hash-set null? table>> assoc-empty? ;
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M: hash-set cardinality table>> assoc-size ;
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M: sequence fast-set <hash-set> ;
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M: f fast-set drop H{ } clone hash-set boa ;
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M: sequence duplicates
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f fast-set [ [ in? ] [ adjoin ] 2bi ] curry filter ;
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<PRIVATE
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: (all-unique?) ( elt hash -- ? )
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2dup in? [ 2drop f ] [ adjoin t ] if ; inline
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PRIVATE>
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M: sequence all-unique?
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dup length <hashtable> hash-set boa
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[ (all-unique?) ] curry all? ;
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