19 lines
465 B
Factor
19 lines
465 B
Factor
! Copyright (C) 2008 Slava Pestov.
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! See http://factorcode.org/license.txt for BSD license.
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USING: kernel assocs ;
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IN: persistent.assocs
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GENERIC: new-at ( value key assoc -- assoc' )
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M: assoc new-at clone [ set-at ] keep ;
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GENERIC: pluck-at ( key assoc -- assoc' )
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M: assoc pluck-at clone [ delete-at ] keep ;
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: changed-at ( key assoc quot -- assoc' )
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[ [ at ] dip call ] [ drop new-at ] 3bi ; inline
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: conjoined ( key assoc -- assoc' )
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dupd new-at ;
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