From: Diego Olivier Fernandez Pons <Diego.FERNANDEZ_PONS@etu.upmc.fr>
To: Jean-Baptiste Rouquier <jrouquie@ens-lyon.fr>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] getting the type of a polymorphic data ?
Date: Fri, 13 Aug 2004 10:59:46 +0200 (DST) [thread overview]
Message-ID: <Pine.A41.4.44.0408131052480.524432-100000@ibm1> (raw)
In-Reply-To: <1092334731.411bb48b56f4e@mouette.ens-lyon.fr>
Bonjour,
> # type 'a result = 'a * string;;
> # let new_result (a:'a) description = ((a,description) : 'a result);;
> val new_result : 'a -> string -> 'a result = <fun>
> # let print_int ((a,d): int result) = Printf.printf "%s is %d\n%!" d a;;
> val print_int : int result -> unit = <fun>
> # let print_float = ...
> # let x = new_result 10 "the number of elements in the knapsack";;
> val x : int result = ...
> # print_int x;;
> the number of elements in the knapsack is 10
> - : unit = ()
Here is the problem of this approach
# let complex_computation = fun x y -> x + y
val complex_computation : int -> int -> int = <fun>
let x = simple_computation () and
y = simple_computation ()
let z = complex_computation x y
Now I what to add a comment to x to print intermediate results and
check the first computation is correct. In your approach, this lifts x
: int on x : int result. But what will then be the type of
complex_computation ?
int result -> int -> int ?
int -> int result -> int ?
int result -> int result -> int ?
int result -> int result -> int result ?
Diego Olivier
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next prev parent reply other threads:[~2004-08-13 9:02 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-12 18:18 Jean-Baptiste Rouquier
2004-08-13 8:15 ` Diego Olivier Fernandez Pons
2004-08-13 8:59 ` Diego Olivier Fernandez Pons [this message]
[not found] <20040812143443.2aba80c1@babasse>
2004-08-12 12:47 ` Diego Olivier Fernandez Pons
[not found] <Pine.A41.4.44.0408121350120.557174-100000@ibm1>
2004-08-12 12:09 ` Diego Olivier Fernandez Pons
2004-08-12 13:38 ` Damien Doligez
2004-08-12 13:57 ` Diego Olivier Fernandez Pons
2004-08-12 14:13 ` Marcin 'Qrczak' Kowalczyk
2004-08-12 14:26 ` Diego Olivier Fernandez Pons
-- strict thread matches above, loose matches on Subject: below --
2004-08-06 15:05 Diego Olivier Fernandez Pons
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