module type Container =
sig
type 'a t
exception Empty of string
exception Full of string
val create: unit -> 'a t
val put: 'a * 'a t -> unit
val take: 'a t -> 'a
end;;
module ContainerOption =
struct
type 'a t = { mutable a : 'a option }
exception Empty of string
exception Full of string
let create() = { a = None }
let put (e, c) =
match c.a with
| None -> (c.a <- Some e)
| _ -> raise(Full "f")
let take c =
match c.a with
| None -> raise(Empty "e")
| Some e -> begin
begin c.a <- None;
e
None; e end
end;;
let cO = ContainerOption.create();;
ContainerOption.put(1, cO);;
ContainerOption.take cO;;
module ContainerList =
struct
type 'a t = { mutable n : int; mutable a : 'a list }
exception Empty of string
exception Full of string
let create() = { n = 0; a = [] }
let put (e, c) =
match c.n with
| 0 -> begin c.a <- [e]; c.n <- c.n + 1 end
| _ -> raise (Full "f")
let take c =
match c.n with
| 0 -> raise (Empty "e")
| _ -> begin c.n <- c.n - 1; c.a end
end;;
let cL = ContainerList.create();;
ContainerList.put(1, cL);;
ContainerList.take cL;;
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