Article View: comp.lang.misc
Article #3823Mea culpa (was: Re: Re: Algol68 (and standards diatribe))
From: Dr A. N. Walker
Date: Mon, 13 May 1991 16:52
Date: Mon, 13 May 1991 16:52
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In article <1991May10.162820.2662@maths.nott.ac.uk> I wrote
[re a delivered procedure in Algol using a scoped variable "x"]
> You could always declare "HEAP REAL x" to give "x" global scope,
>and then your procedure would work anywhere,
I shouldn't post on Friday afternoons! I started to have nagging
doubts as I drove home, wondering how to do garbage collection efficiently.
My copy of the Report is on loan elsewhere, but assuming that Lindsey and
van der Meulen are right [and they usually are], the procedure is indeed
scoped by the range of "x", not the scope of "x". Thus, the above is not
true, and Steve Knight had a point. This is still not unorthogonal (*all*
procedures are scoped this way, there is nothing special about procedures
being returned as results), but it is certainly unobvious.
--
Andy Walker, Maths Dept., Nott'm Univ., UK.
anw@maths.nott.ac.uk
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!wuarchive!uunet!mcsun!ukc!strath-cs!nott-cs!piaggio!anw From: anw@maths.nott.ac.uk (Dr A. N. Walker) Newsgroups: comp.lang.misc Subject: Mea culpa (was: Re: Re: Algol68 (and standards diatribe)) Message-ID: <1991May13.165257.9727@maths.nott.ac.uk> Date: 13 May 91 16:52:57 GMT References: <1991May10.162820.2662@maths.nott.ac.uk> Reply-To: anw@maths.nott.ac.uk (Dr A. N. Walker) Organization: Maths Dept., Nott'm Univ., UK. Lines: 19