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memoize: change unpacker to embed array type.

db4
John Benediktsson 2013-03-14 14:50:41 -07:00
parent 668de36940
commit 001baa2cc4
1 changed files with 6 additions and 5 deletions
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11
basis/memoize/memoize.factor
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@ -1,8 +1,8 @@
! Copyright (C) 2007, 2010 Slava Pestov, Daniel Ehrenberg.
! See http://factorcode.org/license.txt for BSD license.
USING: kernel hashtables sequences sequences.private arrays
words namespaces make parser effects.parser math assocs effects
definitions quotations summary accessors fry hashtables.identity ;
USING: accessors arrays assocs definitions effects
effects.parser fry hashtables.identity kernel kernel.private
math sequences sequences.private words ;
IN: memoize
<PRIVATE
@ -28,9 +28,10 @@ IN: memoize
[ { } [nsequence] ] if ;
: unpacker ( seq -- quot )
length dup 4 <=
length dup dup 4 <=
[ { [ drop ] [ ] [ first2-unsafe ] [ first3-unsafe ] [ first4-unsafe ] } nth ]
[ [firstn] ] if ;
[ [firstn] ] if swap 1 >
[ [ { array } declare ] prepose ] when ;
: pack/unpack ( quot effect -- newquot )
[ in>> packer ] [ out>> unpacker ] bi surround ;