state_id data type

(this should have been the first commit of Paral-ITP)

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@16688 85f007b7-540e-0410-9357-904b9bb8a0f7

1 files changed, 31 insertions, 0 deletions

diff --git a/lib/stateid.mli b/lib/stateid.mli
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index 000000000..978f12691
--- /dev/null
+++ b/lib/stateid.mli
@@ -0,0 +1,31 @@
+(************************************************************************)
+(*  v      *   The Coq Proof Assistant  /  The Coq Development Team     *)
+(* <O___,, *   INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2010     *)
+(*   \VV/  **************************************************************)
+(*    //   *      This file is distributed under the terms of the       *)
+(*         *       GNU Lesser General Public License Version 2.1        *)
+(************************************************************************)
+
+open Xml_datatype
+
+type state_id
+val initial_state_id : state_id
+val dummy_state_id : state_id
+val fresh_state_id : unit -> state_id
+val string_of_state_id : state_id -> string
+val state_id_of_int : int -> state_id
+val int_of_state_id : state_id -> int
+val newer_than : state_id -> state_id -> bool
+
+(* XML marshalling *)
+val of_state_id : state_id -> xml
+val to_state_id : xml -> state_id
+
+(* Attaches to an exception the concerned state id, plus an optional
+ * state id that is a valid state id before the error.
+ * Backtracking to the valid id is safe.
+ * The initial_state_id is assumed to be safe. *)
+val add_state_id : exn -> ?valid:state_id -> state_id -> exn
+val get_state_id : exn -> (state_id * state_id) option
+
+module StateidOrderedType : Map.OrderedType with type t = state_id