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From: "François Pottier" <francois.pottier@inria.fr>
To: Aaron Gray <aaronngray.lists@gmail.com>,
	OCaML Mailing List <caml-list@inria.fr>
Subject: Re: [Caml-list] coinductive data types
Date: Tue, 30 Aug 2022 09:24:10 +0200	[thread overview]
Message-ID: <25e68e2c-04d2-7764-e189-00812c08a34a@inria.fr> (raw)
In-Reply-To: <CANkmNDf-VLO+1jW1uVCYcP0bh9HaWD-7_5PRD4dVt-SAr356kg@mail.gmail.com>


Hello,

Le 29/08/2022 à 17:43, Aaron Gray a écrit :
> Does either ML or OCaML have coinductive data types ? And if so could
> you please point me at the/some appropriate documentation on them.

ML and OCaml have algebraic data types, which are recursive (that is,
more general than inductive and co-inductive types). Algebraic data
type definitions are not subject to a positivity restriction, and
algebraic data types can be constructed and deconstructed by recursive
functions, which are not subject to a termination check.

If you want to see a typical example of a "co-inductive" data structure
encoded in OCaml, I suggest to have a look at "sequences", which can be
described as potentially infinite lists:

   https://v2.ocaml.org/api/Seq.html

-- 
François Pottier
francois.pottier@inria.fr
http://cambium.inria.fr/~fpottier/

  reply	other threads:[~2022-08-30  7:24 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-08-29 15:43 Aaron Gray
2022-08-30  7:24 ` François Pottier [this message]
2022-08-30 11:11   ` Xavier Leroy
2022-08-30 12:33     ` Aaron Gray
2022-08-31  1:21       ` Jacques Garrigue
     [not found]       ` <11E3A59A-BD33-4EC0-9FAD-711A1EACA35E@gmail.com>
2022-08-31  3:22         ` Aaron Gray
2022-09-01 12:13           ` Jacques Garrigue
2022-08-30 12:37   ` Aaron Gray
2022-08-30 13:57     ` Nate Foster
2022-08-30 15:27       ` Aaron Gray
2022-08-30 15:47     ` François Pottier
2022-08-30 16:32       ` Aaron Gray
2022-08-31  8:19         ` François Pottier
2022-08-30 16:45       ` Andreas Rossberg
2022-08-30 17:01         ` Aaron Gray
2022-08-30 18:20           ` Nate Foster
2022-08-31  8:25         ` François Pottier
2022-08-31  8:46           ` Peter Thiemann
2022-08-31  9:41             ` Andreas Rossberg
2022-08-31 13:49               ` François Pottier
2022-08-31 15:40               ` Peter Thiemann
2022-08-31 16:44                 ` Andreas Rossberg
2022-08-31 15:55               ` Basile Clement
2022-08-31 18:42                 ` Andreas Rossberg

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