From: Jacques Garrigue <garrigue@math.nagoya-u.ac.jp>
To: swaroop@cs.jhu.edu
Cc: caml-list@yquem.inria.fr
Subject: Re: [Caml-list] Recursive types
Date: Wed, 16 Nov 2005 08:40:30 +0900 (JST) [thread overview]
Message-ID: <20051116.084030.02302710.garrigue@math.nagoya-u.ac.jp> (raw)
In-Reply-To: <437A64C1.3000807@cs.jhu.edu>
From: Swaroop Sridhar <swaroop@cs.jhu.edu>
> How are arbitrary recursive types implemented in caml? Is it done using
> an explicit fix point combinator "type" so that the unifier itself does
> not go into an infinite loop?
No, types are just implemented as (cyclic) graphs.
All functions in the type checker have to be careful about not going
into infinite loops. There are various techniques for that, either
keeping a list/set of visited nodes, or using some mutable fields.
A few years ago, infinite loops were a commonly reported bug :-)
Jacques Garrigue
next prev parent reply other threads:[~2005-11-15 23:38 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20050506044107.1698.70519.Mailman@yquem.inria.fr>
2005-11-15 22:44 ` Swaroop Sridhar
2005-11-15 23:40 ` Jacques Garrigue [this message]
2005-11-16 2:20 ` [Caml-list] " Keiko Nakata
2005-11-16 6:47 ` Alain Frisch
2005-11-16 7:40 ` Keiko Nakata
2005-11-16 8:55 ` Jacques Garrigue
2005-11-17 1:45 ` Keiko Nakata
2005-11-16 3:28 ` Swaroop Sridhar
2005-11-16 8:38 ` Jacques Garrigue
2005-11-16 23:00 ` Swaroop Sridhar
2005-11-16 23:56 ` Swaroop Sridhar
2008-03-24 3:16 recursive types Jacques Le Normand
2008-03-24 3:51 ` [Caml-list] " Erik de Castro Lopo
2008-03-24 3:51 ` Erik de Castro Lopo
2008-03-24 8:37 ` Jeremy Yallop
-- strict thread matches above, loose matches on Subject: below --
2004-12-13 9:44 nakata keiko
2004-12-13 9:58 ` [Caml-list] " Damien Pous
2004-12-13 12:31 ` skaller
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