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module Error = struct
open Concepts.Condition
let not_admitting () =
condition "not-admitting" "A handle was expected to carry the admission protocol and did not"
empty
end
type violations = (string * Concepts.Tuple.t) list
class type implementation = object
method check : (violations, Concepts.Condition.condition) result
end
type Handle.protocol += Admission of implementation
type t = implementation
let make impl = Admission (impl :> implementation)
let from handle = Handle.into handle (function Admission impl -> Some impl | _ -> None)
let require handle = from handle |> Option.to_result ~none:(Error.not_admitting ())
let check i = Handle.invoke i (fun o -> o#check)
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