! Copyright (C) 2005, 2010 Slava Pestov.
! See http://factorcode.org/license.txt for BSD license.
USING: kernel math math.order strings arrays vectors sequences
-sequences.private accessors fry combinators.short-circuit ;
+sequences.private accessors fry combinators.short-circuit
+combinators ;
IN: grouping
<PRIVATE
: all-eq? ( seq -- ? ) [ eq? ] monotonic? ;
-TUPLE: circular-slice < slice ;
+TUPLE: circular-slice
+ { from read-only }
+ { to read-only }
+ { seq read-only } ;
+INSTANCE: circular-slice virtual-sequence
+M: circular-slice equal? over slice? [ sequence= ] [ 2drop f ] if ;
+M: circular-slice hashcode* [ sequence-hashcode ] recursive-hashcode ;
+M: circular-slice length [ to>> ] [ from>> ] bi - ; inline
+M: circular-slice virtual-exemplar seq>> ; inline
M: circular-slice virtual@
[ from>> + ] [ seq>> ] bi [ length slice-mod ] keep ; inline