[hcoop/debian/mlton.git] / mlton / ssa / three-point-lattice.fun

(* Copyright (C) 1999-2006 Henry Cejtin, Matthew Fluet, Suresh
 *    Jagannathan, and Stephen Weeks.
 * Copyright (C) 1997-2000 NEC Research Institute.
 *
 * MLton is released under a BSD-style license.
 * See the file MLton-LICENSE for details.
 *)

functor ThreePointLattice(S: THREE_POINT_LATTICE_STRUCTS): THREE_POINT_LATTICE = 
struct

open S

structure L = NPointLattice(val names = [bottom, mid, top])
open L

val isBottom = fn x => isN (x, 0)
val isMid = fn x => isN (x, 1)
val isTop = fn x => isN (x, 2)
val makeMid = fn x => makeN (x, 1)
val makeTop = fn x => makeN (x, 2)
val whenMid = fn (x, h) => whenN (x, 1, h)
val whenTop = fn (x, h) => whenN (x, 2, h)
end
Commit	Line	Data
7f918cf1 CE	1	(* Copyright (C) 1999-2006 Henry Cejtin, Matthew Fluet, Suresh
	2	* Jagannathan, and Stephen Weeks.
	3	* Copyright (C) 1997-2000 NEC Research Institute.
	4	*
	5	* MLton is released under a BSD-style license.
	6	* See the file MLton-LICENSE for details.
	7	*)
	8
	9	functor ThreePointLattice(S: THREE_POINT_LATTICE_STRUCTS): THREE_POINT_LATTICE =
	10	struct
	11
	12	open S
	13
	14	structure L = NPointLattice(val names = [bottom, mid, top])
	15	open L
	16
	17	val isBottom = fn x => isN (x, 0)
	18	val isMid = fn x => isN (x, 1)
	19	val isTop = fn x => isN (x, 2)
	20	val makeMid = fn x => makeN (x, 1)
	21	val makeTop = fn x => makeN (x, 2)
	22	val whenMid = fn (x, h) => whenN (x, 1, h)
	23	val whenTop = fn (x, h) => whenN (x, 2, h)
	24	end