Branched paramodulation for CNF (Horn clauses)

[helm.git] / helm / software / components / ng_paramodulation / terms.ml

diff --git a/helm/software/components/ng_paramodulation/terms.ml b/helm/software/components/ng_paramodulation/terms.ml
index 9a225fd27b2807f3a3ea37d57276eb93332e384a..db4c8cad6bce2680f9b98f538373cb8a9c274d5d 100644 (file)
--- a/helm/software/components/ng_paramodulation/terms.ml
+++ b/helm/software/components/ng_paramodulation/terms.ml
@@ -44,15 +44,22 @@ type 'a unit_clause =
  * varlist       (* variable list *)
  * 'a proof      (* proof *)
 
-type 'a passive_clause = int * 'a unit_clause (* weight * equation *)
+type 'a clause =
+    int
+    * 'a literal list (* left hand side of the arrow *)
+    * 'a literal list (* right hand side of the arrow *)
+    * varlist
+    * 'a proof
 
+type 'a passive_clause = int * 'a clause (* weight * equation *)
 
-let vars_of_term t =
+
+let vars_of_term ?(start_acc=[]) t =
   let rec aux acc = function
     | Leaf _ -> acc
     | Var i -> if (List.mem i acc) then acc else i::acc
     | Node l -> List.fold_left aux acc l
-  in aux [] t
+  in aux start_acc t
 ;;
 
 module OT =