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From: randy@utcsri.UUCP (Randall S. Becker)
Newsgroups: net.lang.c
Subject: Re: unary +
Message-ID: <2591@utcsri.UUCP>
Date: Sat, 19-Apr-86 19:16:44 EST
Article-I.D.: utcsri.2591
Posted: Sat Apr 19 19:16:44 1986
Date-Received: Sat, 19-Apr-86 19:20:02 EST
References: <2323@brl-smoke.ARPA> <687@bentley.UUCP> <1245@mmintl.UUCP>
Reply-To: randy@utcsri.UUCP (Randall S. Becker)
Organization: CSRI, University of Toronto
Lines: 35
Summary: 

In article <1245@mmintl.UUCP> franka@mmintl.UUCP (Frank Adams) writes:
>
>In article <687@bentley.UUCP> kwh@bentley.UUCP writes:
>>In article <2323@brl-smoke.ARPA> HARGED%ti-eg.csnet@CSNET-RELAY.ARPA writes:
>>>Folks, no two ways about it: "a + +(b + c)" looks very strange (it looks
>>>like a typographical error), particularly when it is *required* to
>>>accomplish what most people intuitively assume "a + (b + c)" will
>>>accomplish.  From a human factors standpoint, this proposal is a
>>>disaster.
>
>Let me repeat my suggestion that "a + [b + c]" be used for this purpose.
>It isn't *obvious* what it is intended to mean differently from "a + (b + c)",
>but it at least doesn't look like a typographical error.  Use of brackets
>of arbitrary shape or size has a long mathematical tradition.
>

Forgive me for asking, but what is meant by a + +(b + c)? 
	Common interpretations:
		a + abs(b + c)		(not likely)
		a + (b + c)		(likely, in my opinion)

Now, if unary plus is equivalent to the generic abs() operator then why not
use abs()? I know, C doesn't have generics. I would argue that the meaning
is exactly the second case. What does + ( -1 ) mean? -1. How about 
- + - 1? 1. Obviously, +1 had better be 1. The use of unary '+' as a no 
sign change operator is the accepted definition in some languages developed
at the University of Toronto.


Randy

-- 
		Randall S. Becker
		Usenet:	..!utcsri!randy
		CSNET:	randy@toronto