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[Caml-list] type equality help (camlidl related but not directly)
-
ronniec95@l...
- David MENTRE
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| Date: | 2003-12-23 (16:00) |
| From: | David MENTRE <dmentre@l...> |
| Subject: | Re: [Caml-list] type equality help (camlidl related but not directly) |
Hello,
ronniec95@lineone.net writes:
> type union_9 =
> | NUMERIC
> | STRING
> | TBOOL
> | ENUM_DATA
> | CONTROL
> | ENCRYPT
> and msg_type = union_9
>
> let foo x : msg_type option = x
^^^^^^Here is the trick
> If I try to do
>
> # foo STRING;;
> Characters 4-10:
> foo STRING;;
> ^^^^^^
> This expression has type union_9 but is here used with type msg_type option
You should do :
# foo (Some STRING);;
- : msg_type option = Some STRING
foo is defined as an option (| None | Some of 'a) over msg_type.
Yours,
d.
--
David Mentré <dmentre@linux-france.org>
http://www.linux-france.org/~dmentre/david-mentre-public-key.asc
GnuPG key fingerprint: A7CD 7357 3EC4 1163 745B 7FD3 FB3E AD7C 2A18 BE9E
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