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type ('a, 's) io
type 's scheduler =
{ bind : 'a 'b. ('a, 's) io -> ('a -> ('b, 's) io) -> ('b, 's) io
; return : 'a. 'a -> ('a, 's) io }
type ('f, 's, 'e) seek =
{ lseek : 'f -> int -> [ `SET | `CUR | `END ] -> ((int, 'e) result, 's) io }
module type X = sig
type 'a s
type t
external inj : 'a s -> ('a, t) io = "%identity"
external prj : ('a, t) io -> 'a s = "%identity"
end
module Common = struct
type t
external inj : 'a -> 'b = "%identity"
external prj : 'a -> 'b = "%identity"
end
module type FUNCTOR = sig type 'a t end
module Make (T : FUNCTOR) = struct
type 'a s = 'a T.t
include Common
end
module type IFLOW = sig
type scheduler
type buffer
type error
type flow
val input : flow -> buffer -> off:int -> len:int -> ((int, error) result, scheduler) io
end
module type OFLOW = sig
type scheduler
type buffer
type error
type flow
val output : flow -> buffer -> off:int -> len:int -> ((int, error) result, scheduler) io
end
type ('f, 'b, 's, 'e) iflow =
(module IFLOW with type flow = 'f and type buffer = 'b and type scheduler = 's and type error = 'e)
type ('f, 'b, 's, 'e) oflow =
(module OFLOW with type flow = 'f and type buffer = 'b and type scheduler = 's and type error = 'e)