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(* ========================================================================= *)
(* THE WAITING SET OF CLAUSES *)
(* Copyright (c) 2002 Joe Leslie-Hurd, distributed under the BSD License *)
(* ========================================================================= *)
signature Waiting =
sig
(* ------------------------------------------------------------------------- *)
(* The parameters control the order that clauses are removed from the *)
(* waiting set: clauses are assigned a weight and removed in strict weight *)
(* order, with smaller weights being removed before larger weights. *)
(* *)
(* The weight of a clause is defined to be *)
(* *)
(* d * s^symbolsWeight * v^variablesWeight * l^literalsWeight * m *)
(* *)
(* where *)
(* *)
(* d = the derivation distance of the clause from the axioms *)
(* s = the number of symbols in the clause *)
(* v = the number of distinct variables in the clause *)
(* l = the number of literals in the clause *)
(* m = the truth of the clause wrt the models *)
(* ------------------------------------------------------------------------- *)
type weight = real
type modelParameters =
{model : Model.parameters,
initialPerturbations : int,
maxChecks : int option,
perturbations : int,
weight : weight}
type parameters =
{symbolsWeight : weight,
variablesWeight : weight,
literalsWeight : weight,
models : modelParameters list}
(* ------------------------------------------------------------------------- *)
(* A type of waiting sets of clauses. *)
(* ------------------------------------------------------------------------- *)
type waiting
type distance
(* ------------------------------------------------------------------------- *)
(* Basic operations. *)
(* ------------------------------------------------------------------------- *)
val default : parameters
val new :
parameters ->
{axioms : Clause.clause list,
conjecture : Clause.clause list} -> waiting
val size : waiting -> int
val pp : waiting Print.pp
(* ------------------------------------------------------------------------- *)
(* Adding new clauses. *)
(* ------------------------------------------------------------------------- *)
val add : waiting -> distance * Clause.clause list -> waiting
(* ------------------------------------------------------------------------- *)
(* Removing the lightest clause. *)
(* ------------------------------------------------------------------------- *)
val remove : waiting -> ((distance * Clause.clause) * waiting) option
end
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