From: Thomas Fischbacher <Thomas.Fischbacher@Physik.Uni-Muenchen.DE>
To: skaller <skaller@users.sourceforge.net>
Cc: Markus Mottl <markus@oefai.at>,
Andrej Bauer <Andrej.Bauer@andrej.com>,
caml-list <caml-list@inria.fr>
Subject: Re: [Caml-list] environment idiom
Date: Mon, 13 Dec 2004 09:37:19 +0100 (CET) [thread overview]
Message-ID: <Pine.LNX.4.58.0412130931340.13773@eiger.cip.physik.uni-muenchen.de> (raw)
In-Reply-To: <1102901206.2768.127.camel@pelican.wigram>
On Mon, 13 Dec 2004, skaller wrote:
> > > So monadic programming with state transformers is NOT
> > > referentially transparent or purely functional at all.
> >
> > Actually, it is. :-)
>
> Actually it is pointless after I took the trouble
> to explain why this is not the case, to make such
> a bland statement.
Then let me re-formulate it in other words:
I think you do not yet fully appreciate the key point concerning the
monadic approach.
Or in still other words: could you please show me a piece of haskell
code that uses monads but is not referentially transparent (assuming you
do not use "unofficial" features such as, in particular, unsafePerformIO)?
What I want to see in particular is a few lines of haskell, where X=Y
holds, but the semantics of the program change if I substitute the
definition of X with that of Y.
--
regards, tf@cip.physik.uni-muenchen.de (o_
Thomas Fischbacher - http://www.cip.physik.uni-muenchen.de/~tf //\
(lambda (n) ((lambda (p q r) (p p q r)) (lambda (g x y) V_/_
(if (= x 0) y (g g (- x 1) (* x y)))) n 1)) (Debian GNU)
next prev parent reply other threads:[~2004-12-13 8:37 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-12-09 2:07 HENRIKSON, JEFFREY
2004-12-09 4:47 ` [Caml-list] " Jacques Garrigue
2004-12-09 6:02 ` Michael Walter
2004-12-09 11:28 ` Jacques Garrigue
2004-12-09 20:02 ` pad
2004-12-09 23:11 ` Jacques Garrigue
2004-12-10 2:30 ` skaller
2004-12-09 9:09 ` Richard Jones
2004-12-09 13:12 ` [Caml-list] " Ville-Pertti Keinonen
2004-12-10 11:59 ` Richard Jones
2004-12-10 10:52 ` [Caml-list] " Andrej Bauer
2004-12-10 12:13 ` Richard Jones
2004-12-10 23:35 ` Jacques Garrigue
2004-12-11 2:30 ` skaller
2004-12-11 14:31 ` Andrej Bauer
2004-12-11 18:13 ` Markus Mottl
2004-12-11 23:56 ` skaller
2004-12-12 2:36 ` William Lovas
2004-12-12 5:33 ` skaller
2004-12-12 19:09 ` Michael Walter
2004-12-13 0:48 ` skaller
2004-12-13 2:03 ` Michael Walter
2004-12-13 2:05 ` Michael Walter
[not found] ` <877e9a170412121844b633bb8@mail.gmail.com>
2004-12-13 2:45 ` Michael Walter
2004-12-13 6:18 ` skaller
2004-12-13 7:08 ` skaller
2004-12-13 9:56 ` Michael Walter
2004-12-13 12:59 ` skaller
2004-12-13 8:56 ` Thomas Fischbacher
2004-12-13 9:21 ` Jacques Garrigue
2004-12-13 10:05 ` Michael Walter
2004-12-13 10:29 ` Thomas Fischbacher
2004-12-13 21:16 ` Michael Walter
2004-12-13 10:20 ` Thomas Fischbacher
2004-12-13 12:09 ` Jacques Garrigue
2004-12-13 12:48 ` Thomas Fischbacher
2004-12-13 14:09 ` skaller
2004-12-13 21:39 ` Michael Walter
2004-12-13 13:22 ` skaller
2004-12-13 16:54 ` Marcin 'Qrczak' Kowalczyk
2004-12-13 18:44 ` Thomas Fischbacher
2004-12-13 10:11 ` Michael Walter
2004-12-13 11:46 ` skaller
2004-12-13 5:41 ` skaller
2004-12-13 9:29 ` Michael Walter
2004-12-13 12:30 ` skaller
2004-12-13 13:49 ` Martin Berger
2004-12-12 23:03 ` Thomas Fischbacher
2004-12-13 1:26 ` skaller
2004-12-13 8:37 ` Thomas Fischbacher [this message]
2004-12-13 10:53 ` skaller
2004-12-13 11:38 ` Martin Berger
2004-12-13 13:33 ` skaller
2004-12-13 12:01 ` Thomas Fischbacher
2004-12-13 13:41 ` skaller
2004-12-11 23:29 ` skaller
2004-12-12 0:21 ` Jacques Carette
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