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random: support random on sets.

db4
John Benediktsson 2012-10-05 15:35:22 -07:00
parent cf3c197743
commit e8d50a2d08
1 changed files with 9 additions and 4 deletions
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13
basis/random/random.factor
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@ -2,11 +2,12 @@
! See http://factorcode.org/license.txt for BSD license.
USING: accessors alien.data arrays assocs byte-arrays
byte-vectors combinators combinators.short-circuit fry
hashtables hashtables.private hints io.backend io.binary
kernel locals math math.bitwise math.constants math.functions
math.order math.ranges namespaces sequences sequences.private
sets summary system typed vocabs ;
hashtables hashtables.private hash-sets hints io.backend
io.binary kernel locals math math.bitwise math.constants
math.functions math.order math.ranges namespaces sequences
sequences.private sets summary system typed vocabs ;
QUALIFIED-WITH: alien.c-types c
QUALIFIED-WITH: sets sets
IN: random
SYMBOL: system-random-generator
@ -83,6 +84,10 @@ M: hashtable random
[ array-nth ] [ [ 1 + ] dip array-nth ] 2bi 2array
] if-zero ;
M: sets:set random members random ;
M: hash-set random table>> random first ;
: randomize-n-last ( seq n -- seq )
[ dup length dup ] dip - 1 max '[ dup _ > ]
[ [ random ] [ 1 - ] bi [ pick exchange-unsafe ] keep ]