Andrew Dunstan <and...@dunslane.net> writes:
> Boszormenyi Zoltan wrote:
>> Is it *really* a bug? I recalled a comment from my C teacher
>> in '92 or '93 about this exact issue, that the prefix/postfix
>> increment/decrement operators are executed in the
>> statement in an implementation-defined order,
> Not if they come after a short-circuit operator such as && - after all,
> that's what short-circuit evaluation implies. If the left hand operand
> of && is false the right hand should not be evaluated at all.
Yes. && is a sequence point and the compiler is not allowed to move
side-effects across a sequence point. What your C teacher was warning
you against was things like
a[i] = i++;
'=' is not a sequence point so it's undefined which array index
will be stored into.
regards, tom lane
--
Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-hackers
