Version française
Home     About     Download     Resources     Contact us    
Browse thread
Re: [Caml-list] Type variables won't generalize
[ Home ] [ Index: by date | by threads ]
[ Search: ]

[ Message by date: previous | next ] [ Message in thread: previous | next ] [ Thread: previous | next ]
Date: -- (:)
From: Ryan Tarpine <rtarpine@h...>
Subject: Re: [Caml-list] Type variables won't generalize
>From: Remi VANICAT <vanicat@labri.u-bordeaux.fr>
>To: caml-list@inria.fr
>Subject: Re: [Caml-list] Type variables won't generalize
>Date: 04 Apr 2002 14:04:16 +0200
>
>...
>
>If you already know the types you can put in this field, you can use a
>new variant type :
>
>type multi =
>| Float of float
>| Int of int
>| Int2float of int -> float
>
>...
>

The problem is that I can't be sure of which types could be stored there.  
This record is meant to implement an object for an object-oriented language 
I'm trying to write.  The problem field stores primitives like ints and 
floats for Integer and Float classes, but in the case that later on I would 
like to add new primitives like Num.num through extension modules (e.g., not 
by modifying and recompiling the entire language) a normal variant won't 
work.  I unfortunately am having problems with typechecking when using 
polymorphic variants, so for now I am just going to use normal variants.

Thanks,

Ryan Tarpine, rtarpine@hotmail.com
"To err is human, to compute divine.  Trust your computer but not its 
programmer."
  - Morris Kingston

Ryan Tarpine, rtarpine@hotmail.com
"To err is human, to compute divine.  Trust your computer but not its 
programmer."
  - Morris Kingston

_________________________________________________________________
MSN Photos is the easiest way to share and print your photos: 
http://photos.msn.com/support/worldwide.aspx

-------------------
To unsubscribe, mail caml-list-request@inria.fr Archives: http://caml.inria.fr
Bug reports: http://caml.inria.fr/bin/caml-bugs FAQ: http://caml.inria.fr/FAQ/
Beginner's list: http://groups.yahoo.com/group/ocaml_beginners