Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!uunet!mcsun!ukc!dcl-cs!aber-cs!pcg
From: pcg@aber-cs.UUCP (Piercarlo Grandi)
Newsgroups: comp.lang.misc
Subject: Re: Algol 68.
Message-ID: <1626@aber-cs.UUCP>
Date: 9 Feb 90 20:19:55 GMT
Reply-To: pcg@cs.aber.ac.uk (Piercarlo Grandi)
Organization: Dept of CS, UCW Aberystwyth
	(Disclaimer: my statements are purely personal)
Lines: 29

In article <3968@ganymede.inmos.co.uk> mph@inmos.co.uk (Mike Harrison) writes:
    
    I have just looked at my copy of the 'revised report' and can't find any 
    reference to 'ronly', [I didn't think I had come across it], so what is it?
    Some kind of pragmat (and in what implementation) ?

Well, my love of Algol 68 is such that I exxagerated a bit
here. What actually happens is that in Algol 68 you have to
explicitly declare entitities to be variables. In a sense (but
not completely) REF is a 'notronly' keyword.
    
    While talking of pragmats, in S3, ICL's Algol68 based
    systems langauge, there was a 'pr' RARELY, which informed
    the compiler that the relevant code would be obeyed only on
    'rare' occasions.    

	[ ... ]

    For example, in Ada there is an optimisation for passive tasks, which
    eliminates much of the full generality of tasks [Nassi & Haberman, I
    think].

Thank you for two good examples. Quite interesting ones. In
particular the one about RARELY. Optimizing programs for
locality seems to be a lost art. Bleeech.
-- 
Piercarlo "Peter" Grandi           | ARPA: pcg%cs.aber.ac.uk@nsfnet-relay.ac.uk
Dept of CS, UCW Aberystwyth        | UUCP: ...!mcvax!ukc!aber-cs!pcg
Penglais, Aberystwyth SY23 3BZ, UK | INET: pcg@cs.aber.ac.uk