(* ========================================================================= *)
(* MATCHING AND UNIFICATION FOR SETS OF FIRST ORDER LOGIC ATOMS *)
(* Copyright (c) 2001 Joe Hurd, distributed under the BSD License *)
(* ========================================================================= *)
signature AtomNet =
sig
(* ------------------------------------------------------------------------- *)
(* A type of atom sets that can be efficiently matched and unified. *)
(* ------------------------------------------------------------------------- *)
type parameters = {fifo : bool}
type 'a atomNet
(* ------------------------------------------------------------------------- *)
(* Basic operations. *)
(* ------------------------------------------------------------------------- *)
val new : parameters -> 'a atomNet
val size : 'a atomNet -> int
val insert : 'a atomNet -> Atom.atom * 'a -> 'a atomNet
val fromList : parameters -> (Atom.atom * 'a) list -> 'a atomNet
val filter : ('a -> bool) -> 'a atomNet -> 'a atomNet
val toString : 'a atomNet -> string
val pp : 'a Print.pp -> 'a atomNet Print.pp
(* ------------------------------------------------------------------------- *)
(* Matching and unification queries. *)
(* *)
(* These function return OVER-APPROXIMATIONS! *)
(* Filter afterwards to get the precise set of satisfying values. *)
(* ------------------------------------------------------------------------- *)
val match : 'a atomNet -> Atom.atom -> 'a list
val matched : 'a atomNet -> Atom.atom -> 'a list
val unify : 'a atomNet -> Atom.atom -> 'a list
end