1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
|
(*
* Copyright (C) 2010-2011 Citrix Systems Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; version 2.1 only. with the special
* exception on linking described in file LICENSE.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*)
(** 1-parameter monads. *)
module M1 = struct
module type BASE =
sig
type 'a m
val bind : 'a m -> ('a -> 'b m) -> 'b m
val return : 'a -> 'a m
end
module type MONAD =
sig
type 'a m
val (>>=) : 'a m -> ('a -> 'b m) -> 'b m
val bind : 'a m -> ('a -> 'b m) -> 'b m
val return : 'a -> 'a m
end
module Make (B : BASE) : MONAD with type 'a m = 'a B.m =
struct
type 'a m = 'a B.m
let (>>=) = B.bind
let bind = B.bind
let return = B.return
end
end
(** 2-parameter monads. *)
module M2 = struct
module type BASE =
sig
type ('a, 'x) m
val bind : ('a, 'x) m -> ('a -> ('b, 'x) m) -> ('b, 'x) m
val return : 'a -> ('a, 'x) m
end
module type MONAD =
sig
type ('a, 'x) m
val (>>=) : ('a, 'x) m -> ('a -> ('b, 'x) m) -> ('b, 'x) m
val bind : ('a, 'x) m -> ('a -> ('b, 'x) m) -> ('b, 'x) m
val return : 'a -> ('a, 'x) m
end
module Make (B : BASE) : MONAD with type ('a, 'x) m = ('a, 'x) B.m =
struct
type ('a, 'x) m = ('a, 'x) B.m
let (>>=) = B.bind
let bind = B.bind
let return = B.return
end
end
|
