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Diffstat (limited to '')
| -rw-r--r-- | lib/protocols/Enumerable.ml | 2 | ||||
| -rw-r--r-- | lib/protocols/Enumerable.mli | 7 |
2 files changed, 9 insertions, 0 deletions
diff --git a/lib/protocols/Enumerable.ml b/lib/protocols/Enumerable.ml index 53db834..76b4e86 100644 --- a/lib/protocols/Enumerable.ml +++ b/lib/protocols/Enumerable.ml @@ -19,3 +19,5 @@ let make impl = Enumerable (impl :> implementation) let from handle = Handle.into handle (function Enumerable impl -> Some impl | _ -> None) let require handle = from handle |> Option.to_result ~none:(Error.not_enumerable ()) let enumerate i = Handle.invoke i (fun o -> o#enumerate) +let cursor handle = Result.bind (require handle) enumerate +let scan handle f = Result.bind (cursor handle) (fun cursor -> Cursor.consuming cursor f) diff --git a/lib/protocols/Enumerable.mli b/lib/protocols/Enumerable.mli index 2c0ee69..a0c1f1c 100644 --- a/lib/protocols/Enumerable.mli +++ b/lib/protocols/Enumerable.mli @@ -8,3 +8,10 @@ val make : #implementation -> Handle.protocol val from : Handle.t -> t Handle.interface option val require : Handle.t -> (t Handle.interface, Concepts.Condition.condition) result val enumerate : t Handle.interface -> (Handle.t, Concepts.Condition.condition) result +val cursor : Handle.t -> (Handle.t, Concepts.Condition.condition) result + +(** [f] over a cursor on [handle], released once [f] returns. *) +val scan : + Handle.t -> + (Cursor.t Handle.interface -> ('a, Concepts.Condition.condition) result) -> + ('a, Concepts.Condition.condition) result |