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Re: Arithmetic assignment side-effects


From: Chris Down
Subject: Re: Arithmetic assignment side-effects
Date: Sun, 4 Aug 2013 22:53:27 +0200
User-agent: Mutt/1.5.21 (2010-09-15)

On 2013-08-04 22:41, Andreas Schwab wrote:
> x+=a is the same as x=x+a.

In most cases I'd agree, in this case I think it changes the logic when
considering += as an atomic increment (which, of course, += isn't, but
aesthetically it presents itself as such) as opposed to two separate operations.

> Now replace a by (x=1) and it becomes obvious that 1 is a perfectly valid
> outcome.

Yes, I agree, it becomes ambiguous when described in this fashion. I think the
aesthetics of x+=y vs x=x+y are important here.

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