[Caml-list] type equality help (camlidl related but not directly)

[Caml-list] type equality help (camlidl related but not directly)

[ronniec95]

Camlidl generates the following mli (sample here)

type union_9 =
  | NUMERIC
  | STRING
  | TBOOL
  | ENUM_DATA
  | CONTROL
  | ENCRYPT
and msg_type = union_9

let foo x : msg_type option = x



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


How can I either get camlidl to not do this, or what is the syntax in Ocaml
to ensure I use the right type?

Thanks,

Ronnie

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Re: [Caml-list] type equality help (camlidl related but not directly)

[David MENTRE]

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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Re: [Caml-list] type equality help - Thanks to all

[ronniec95]

That made sense. I guess not quite clear from docs.

I should be able to progress a lot further on my project. thanks very much
for the responses.

Ronnie
>-- Original Message --
>To: ronniec95@lineone.net
>Cc: caml-list@inria.fr
>Subject: Re: [Caml-list] type equality help (camlidl related but not
> directly)
>From: David MENTRE <dmentre@linux-france.org>
>Date: Tue, 23 Dec 2003 17:00:04 +0100
>
>
>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 t
>e 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 = Som
> 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 7
>5B  7FD3 FB3E AD7C 2A18 BE9E

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>/group/ocaml_beginners



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