From: skaller <skaller@users.sourceforge.net>
To: "Beck01, Wolfgang" <BeckW@t-systems.com>
Cc: caml-list <caml-list@inria.fr>
Subject: Re: AW: [Caml-list] paralell assignment problem
Date: 09 Feb 2005 02:30:05 +1100 [thread overview]
Message-ID: <1107876604.5022.44.camel@pelican.wigram> (raw)
In-Reply-To: <76C27E1CE3FFC847B4D51C645D6F42AA15FE3B@E9JDF.mgb01.telekom.de>
On Wed, 2005-02-09 at 01:24, Beck01, Wolfgang wrote:
> > I seek a solution which minimises the number of assignments.
[]
> you probably know the 'xor trick' to swap value without a temporary:
I've heard of it :)
> Certainly not what you were looking for, but always nice :-)
You are right, it isn't useful here for three reasons:
(1) the values being assigned aren't necessarily bitwise
copyable, in fact they're (more or less) arbitrary C++ values
(2) The intent is to reduce time not storage
(3) The RHS can be arbitrary expressions. To apply XOR,
we'd first assign each RHS expression to a temporary ..
and having done that we no longer need XOR, we can just
assign variables to those temporaries.
--
John Skaller, mailto:skaller@users.sf.net
voice: 061-2-9660-0850,
snail: PO BOX 401 Glebe NSW 2037 Australia
Checkout the Felix programming language http://felix.sf.net
prev parent reply other threads:[~2005-02-08 15:30 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-02-08 14:24 Beck01, Wolfgang
2005-02-08 15:30 ` skaller [this message]
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