Mercurial > urweb
annotate tests/functor.lac @ 167:2be573fec9a6
Unurlifying a datatype; longjmp-based error signaling mechanism
author | Adam Chlipala <adamc@hcoop.net> |
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date | Tue, 29 Jul 2008 15:25:42 -0400 |
parents | ac4c0b4111ba |
children |
rev | line source |
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adamc@40 | 1 signature S = sig |
adamc@40 | 2 type t |
adamc@40 | 3 val z : t |
adamc@40 | 4 val s : t -> t |
adamc@40 | 5 end |
adamc@40 | 6 |
adamc@40 | 7 signature T = sig |
adamc@40 | 8 type t |
adamc@40 | 9 val three : t |
adamc@40 | 10 end |
adamc@40 | 11 |
adamc@42 | 12 functor F (M : S) : T where type t = M.t = struct |
adamc@41 | 13 type t = M.t |
adamc@40 | 14 val three = M.s (M.s (M.s M.z)) |
adamc@40 | 15 end |
adamc@43 | 16 |
adamc@44 | 17 |
adamc@44 | 18 structure O = F (struct |
adamc@44 | 19 type t = int |
adamc@44 | 20 val z = 0 |
adamc@44 | 21 val s = fn x : t => x |
adamc@44 | 22 end) |
adamc@44 | 23 val three : int = O.three |
adamc@44 | 24 |
adamc@44 | 25 structure S = struct |
adamc@44 | 26 type t = int |
adamc@44 | 27 val z = 0 |
adamc@44 | 28 val s = fn x : t => x |
adamc@44 | 29 end |
adamc@44 | 30 structure SO = F (S) |
adamc@44 | 31 val three : int = SO.three |
adamc@44 | 32 |
adamc@44 | 33 structure SS : S = S |
adamc@44 | 34 structure SSO = F (SS) |
adamc@44 | 35 val three : SS.t = SSO.three |
adamc@47 | 36 |
adamc@47 | 37 val main = three |