diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/stateid.ml | 3 | ||||
| -rw-r--r-- | lib/stateid.mli | 7 |
2 files changed, 10 insertions, 0 deletions
diff --git a/lib/stateid.ml b/lib/stateid.ml index a1328f156c..2a41cb7866 100644 --- a/lib/stateid.ml +++ b/lib/stateid.ml @@ -45,3 +45,6 @@ type ('a,'b) request = { name : string } +let is_valid_ref = ref (fun ~doc:_ (_ : t) -> true) +let is_valid ~doc id = !is_valid_ref ~doc id +let set_is_valid f = is_valid_ref := f diff --git a/lib/stateid.mli b/lib/stateid.mli index 9b2de9c894..4563710f84 100644 --- a/lib/stateid.mli +++ b/lib/stateid.mli @@ -42,3 +42,10 @@ type ('a,'b) request = { name : string } +(* Asks the document manager is the given state is valid (or belongs to an + old version of the document) *) +val is_valid : doc:int -> t -> bool + +(* By default [is_valid] always answers true, but a document manager supporting + undo operations like the STM can override this. *) +val set_is_valid : (doc:int -> t -> bool) -> unit |