X-Git-Url: http://git.nguyen.vg/gitweb/?a=blobdiff_plain;f=hcons.ml;h=7bc8823b2dfd5020296a0a4e520f5db96c3d406c;hb=df5fdb22632be887ecd9f5c46a014e7e970148a2;hp=eb603855f7a8f32f5694735c1d6a6440d00c1383;hpb=2676d5a3bbb1e6f6a5af66477edfe3b4c849f4e7;p=SXSI%2Fxpathcomp.git

diff --git a/hcons.ml b/hcons.ml
index eb60385..7bc8823 100644
--- a/hcons.ml
+++ b/hcons.ml
@@ -1,37 +1,65 @@
 INCLUDE "utils.ml"
-module type S = 
-sig
-  type data
-  type t 
-  val make : data -> t
-  val node : t -> data
-  val hash : t -> int
-  val uid : t -> int
-  val equal : t -> t -> bool
-end
+module type SA =
+  sig
+    type data
+    type t 
+    val make : data -> t
+    val node : t -> data
+    val hash : t -> int
+    val uid : t -> Uid.t
+    val equal : t -> t -> bool
+
+    val with_id : Uid.t -> t
+ end
+
+module type S =
+  sig
+
+    type data
+    type t = private { id : Uid.t;
+		       key : int;
+		       node : data }
+    val make : data -> t
+    val node : t -> data
+    val hash : t -> int
+    val uid : t -> Uid.t
+    val equal : t -> t -> bool
+
+
+    val with_id : Uid.t -> t
+  end
+
 module Make (H : Hashtbl.HashedType) : S with type data = H.t =
 struct
+  let uid_make = Uid.make_maker()
   type data = H.t
-  type t =  { id : int;
-	      key : int; 
-	      node : data;
-	    }
-  
+  type t = { id : Uid.t;
+	     key : int;
+	     node : data }
   let node t = t.node
-  let hash t = t.key
   let uid t = t.id
-  let gen_uid  =
-    let id = ref ~-1 in 
-      fun () -> incr id;!id
-  let equal = (==)
+  let hash t = t.key
+  let equal t1 t2 = t1 == t2
   module WH = Weak.Make( struct 
 			   type _t = t 
 			   type t = _t 
 			   let hash = hash
-			   let equal a b = a==b || H.equal a.node b.node 
+			   let equal a b = a == b || H.equal a.node b.node 
 			 end)
   let pool = WH.create MED_H_SIZE
   let make x = 
-    let cell = { id = gen_uid(); key = H.hash x; node = x } in
+    let cell = { id = uid_make(); key = H.hash x; node = x } in
       WH.merge pool cell
+
+  exception Found of t
+
+  let with_id id = 
+    try
+      WH.iter (fun r -> if r.id == id then raise (Found r))  pool;      
+      raise Not_found
+    with
+      | Found r -> r
+      | e -> raise e
+  ;;
+
 end