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new accessors

db4
Doug Coleman 2008-08-31 02:52:11 -05:00
parent fbc1076ac2
commit cde71318ab
1 changed files with 7 additions and 7 deletions
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14
extra/math/erato/erato.factor
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@ -1,7 +1,7 @@
! Copyright (c) 2007 Samuel Tardieu.
! See http://factorcode.org/license.txt for BSD license.
USING: bit-arrays kernel lists.lazy math math.functions math.primes.list
math.ranges sequences ;
math.ranges sequences accessors ;
IN: math.erato
<PRIVATE
@ -12,21 +12,21 @@ TUPLE: erato limit bits latest ;
2/ 1- ; inline
: is-prime ( n erato -- bool )
>r ind r> erato-bits nth ; inline
>r ind r> bits>> nth ; inline
: indices ( n erato -- range )
erato-limit ind over 3 * ind swap rot <range> ;
limit>> ind over 3 * ind swap rot <range> ;
: mark-multiples ( n erato -- )
over sq over erato-limit <=
[ [ indices ] keep erato-bits [ f -rot set-nth ] curry each ] [ 2drop ] if ;
over sq over limit>> <=
[ [ indices ] keep bits>> [ f -rot set-nth ] curry each ] [ 2drop ] if ;
: <erato> ( n -- erato )
dup ind 1+ <bit-array> 1 over set-bits erato boa ;
: next-prime ( erato -- prime/f )
[ erato-latest 2 + ] keep [ set-erato-latest ] 2keep
2dup erato-limit <=
[ 2 + ] change-latest [ latest>> ] keep
2dup limit>> <=
[
2dup is-prime [ dupd mark-multiples ] [ nip next-prime ] if
] [