From: blue storm <bluestorm.dylc@gmail.com>
To: caml-list List <caml-list@yquem.inria.fr>
Subject: Re: [Caml-list] Annotated trees
Date: Mon, 7 Jun 2010 14:01:38 +0200 [thread overview]
Message-ID: <AANLkTil5WK6RKiBpRSTKtKehI0H8To8k8cA81BAar-fE@mail.gmail.com> (raw)
In-Reply-To: <AANLkTik0iDx-OGUSKw3ZCU-hV8OvWKH_HEndA85nube3@mail.gmail.com>
On Mon, Jun 7, 2010 at 11:22 AM, Daniel Bünzli
<daniel.buenzli@erratique.ch> wrote:
> That's true and certainly a good argument for the second form if you
> already know the type of your annotations and have such needs. However
> if you want to keep that polymorphic (the annotation is a convenience
> for the client) it results in a type variable per case which becomes
> heavy.
You probably know that already but there is a nice use of object types
as "type-level records" that make that kind of "lots of type
variables" situations tractable :
type 'annot tree =
| Leaf of 'leaf_annot * string
| Node of 'node_annot * 'annot tree list
constraint 'annot =
< leaf : 'leaf_annot;
node : 'node_annot >
next prev parent reply other threads:[~2010-06-07 12:01 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-06 15:26 Daniel Bünzli
2010-06-07 5:09 ` [Caml-list] " Martin Jambon
2010-06-07 5:15 ` Martin Jambon
2010-06-07 9:22 ` Daniel Bünzli
2010-06-07 12:01 ` blue storm [this message]
2010-06-07 6:45 ` Jacques Garrigue
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