* [Caml-list] module type and record
[not found] <65D56CA3-9FDA-11D7-813D-000A95764898@ens-lyon.fr>
@ 2003-06-16 9:59 ` efiliot
2003-06-16 15:08 ` Xavier Leroy
0 siblings, 1 reply; 2+ messages in thread
From: efiliot @ 2003-06-16 9:59 UTC (permalink / raw)
To: caml-list
hello,
I need to declare a record type in a field like :
module A : ( MY_TYPE with type t = { label1 : int ; label2 : string } ) =
struct
....
end
but the compiler seems to refuse this declaration.
Could you give me a solution for this problem ?
Thank You,
Emmanuel Filiot
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* Re: [Caml-list] module type and record
2003-06-16 9:59 ` [Caml-list] module type and record efiliot
@ 2003-06-16 15:08 ` Xavier Leroy
0 siblings, 0 replies; 2+ messages in thread
From: Xavier Leroy @ 2003-06-16 15:08 UTC (permalink / raw)
To: efiliot; +Cc: caml-list
> hello,
> I need to declare a record type in a field like :
>
> module A : ( MY_TYPE with type t = { label1 : int ; label2 : string } ) =
> struct
> ....
> end
>
> but the compiler seems to refuse this declaration.
Currently, only type abbreviations can be added with the "with type"
construct: MODTYPE with type t = some_type_expression.
This restriction is somewhat artificial and I'm considering lifting it.
> Could you give me a solution for this problem ?
Currently, you need to expand "MY_TYPE with..." by hand into
sig
type t = { label1 : int ; label2 : string }
(* other elements of signature MY_TYPE
end
An alternative is to declare the record type separately:
type my_rec = { label1 : int ; label2 : string }
module A : (MY_TYPE with type t = my_rec) = ...
- Xavier Leroy
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2003-06-16 9:59 ` [Caml-list] module type and record efiliot
2003-06-16 15:08 ` Xavier Leroy
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