Implemented LPO

[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 169d19b80b68a52d0eb062162464e451a96a5757..9a225fd27b2807f3a3ea37d57276eb93332e384a 100644 (file)
--- a/helm/software/components/ng_paramodulation/terms.ml
+++ b/helm/software/components/ng_paramodulation/terms.ml
@@ -47,6 +47,14 @@ type 'a unit_clause =
 type 'a passive_clause = int * 'a unit_clause (* weight * equation *)
 
 
+let vars_of_term 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
+;;
+
 module OT =
  struct
    type t = int