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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 type ('a, 'b) t =
24 | Ok of 'a (**The operation succeeded*)
25 | Err of 'b (**The operation failed*)
26
27 let return x = Ok x
28 let fail y = Err y
29 let bind m k = match m with
30 | Ok x -> k x
31 | (Err y) as m' -> m'
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