Date: Fri, 09 May 1997 07:57:00 +0200
From: Michel Quercia <quercia@cal.enst.fr>
To: Christian Lindig <lindig@ips.cs.tu-bs.de>
Subject: Re: arity of type constructors
Christian Lindig wrote:
>
> Objective Caml version 1.05
> # type t = T of int * int;;
> type t = | T of int * int
> # let x = (3,4);;
> val x : int * int = 3, 4
> # T x;;
> The constructor T expects 2 argument(s), but is here applied
> to 1 argument(s)
> # T (3,4);;
> - : t = T (3, 4)
>
> Applying T to x does not work, but applying it to (3,4) does. Why is
> the pair (3,4) counted as 2 arguments?
>
here is the trick :
Objective Caml version 1.05
# type t = T of int * int;;
type t = | T of int * int
# T(3,4);;
- : t = T (3, 4)
# let x = (3,4) in T(x);;
The constructor T expects 2 argument(s), but is here applied to 1
argument(s)
# type u = U of (int * int);;
type u = | U of (int * int)
# let x = (3,4) in U(x);;
- : u = U (3, 4)
#
-- Michel Quercia Lycee Carnot 16 bd Thiers 21000 Dijon mailto:quercia@cal.enst.fr
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