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fccc685 Initial open-source release
MLstate authored
1 (*
2 Copyright © 2011 MLstate
3
4 This file is part of OPA.
5
6 OPA is free software: you can redistribute it and/or modify it under the
7 terms of the GNU Affero General Public License, version 3, as published by
8 the Free Software Foundation.
9
10 OPA is distributed in the hope that it will be useful, but WITHOUT ANY
11 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
12 FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for
13 more details.
14
15 You should have received a copy of the GNU Affero General Public License
16 along with OPA. If not, see <http://www.gnu.org/licenses/>.
17 *)
18 (*
19 author David Rajchenbach-Teller
20 *)
21
22 (**
23 A simple monad for handling operations that may fail.
24 *)
25
26 (**
27 The status of an operation.
28 *)
29 type ('a, 'b) t =
30 | Ok of 'a (**The operation succeeded*)
31 | Err of 'b (**The operation failed*)
32
33 val return : 'a -> ('a, 'b) t
34 val fail: 'b -> ('a, 'b) t
35 val bind: ('a, 'b) t -> ('a -> ('c, 'b) t) -> ('c, 'b) t
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