From: Hendrik Tews <tews@tcs.inf.tu-dresden.de>
To: caml-list@inria.fr
Subject: Re: circular types?
Date: Thu, 26 Oct 2000 11:12:36 +0200 (MET DST) [thread overview]
Message-ID: <200010260912.LAA21537@ithif20.inf.tu-dresden.de> (raw)
In-Reply-To: <39F6E831.621B85E3@ozemail.com.au>
Hi,
John Max Skaller writes:
From: John Max Skaller <skaller@ozemail.com.au>
Date: Thu, 26 Oct 2000 01:03:29 +1100
Subject: Re: circular types?
I think this can be done now. Here is the method: to have a type t
and a class c mutually dependent, for example:
class type c = object x : t end
and type t = C c | Null
write
class type c' ['t] = object x : 't end
type t = C t c' | Null
class type c = t c'
Yes, this is the theoretical answer. But this just doesn't work
out in anything bigger than a tutorial example. I am involved in
programming a logic compiler. We have about 40 variant types and
at least 10 classes. If my design were not constraint by the
abilities of the ocaml compiler some of the classes were in
mutual recursion with the bigger halve of the variant types. So
you are not telling me seriously I should write classes with 10
type variables!
Just for curiosity: Does somebody use the above workaround in a
project with more than 10.000 lines of ocaml code? (We do, but
every typing error is a nightmare.)
Bye,
Hendrik
next prev parent reply other threads:[~2000-10-26 14:48 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-10-23 7:43 Tom Hirschowitz
2000-10-23 15:35 ` Brian Rogoff
2000-10-25 14:03 ` John Max Skaller
2000-10-25 19:47 ` Brian Rogoff
2000-10-26 9:12 ` Hendrik Tews [this message]
2000-10-26 16:37 ` John Max Skaller
2000-10-24 8:37 ` Hendrik Tews
2000-10-25 14:31 ` John Max Skaller
2000-10-26 8:51 ` Hendrik Tews
-- strict thread matches above, loose matches on Subject: below --
2000-10-24 8:48 Tom Hirschowitz
2000-10-26 8:39 ` Hendrik Tews
2000-10-26 9:11 ` Tom Hirschowitz
2000-10-20 2:35 Chris Hecker
2000-10-20 12:24 ` Pierre Weis
2000-10-20 21:34 ` Chris Hecker
2000-10-21 8:02 ` Pierre Weis
2000-10-21 18:37 ` Chris Hecker
2000-10-21 12:22 ` Vitaly Lugovsky
2000-10-21 18:29 ` Chris Hecker
2000-10-21 22:36 ` Brian Rogoff
2000-10-23 18:43 ` Anton Moscal
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