Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!dgp.toronto.edu!flaps
From: flaps@dgp.toronto.edu (Alan J Rosenthal)
Newsgroups: comp.lang.c
Subject: syntax for unary assignment operators (was Re: C history question)
Keywords: C design, XOR
Message-ID: <1989Sep17.150504.16643@jarvis.csri.toronto.edu>
Date: 17 Sep 89 19:05:04 GMT
References: <575@calmasd.Prime.COM> <1687@sunset.MATH.UCLA.EDU> <174@cpsolv.UUCP>
Lines: 20

rhg@cpsolv.UUCP (Richard H. Gumpertz) writes:
>As long as we are discussing missing "assignment" operators, you might ponder
>the lack of unary assignment operators.  Why should I have to say X = -X or
>X = ~X?  Why not have unary assignment operators (ala ++ and --) for negation
>and complement?  I suppose a new syntax would have to be invented, but it
>might be useful at times.

A somewhat consistent but fairly bizarre syntax would be
	x -=;

The analogy to x -= y is that
	x fn= y;
expands to
	x = fn(x, y);
so
	x fn=;
expands to
	x = fn(x);

ajr