Al,
cast of float bit painful in recursive descent parsers. I've managed
to find cases where Comeau's online compiler doesn't get it right,
and they're pretty good.
I would be interested to know what these cases were.
extern int n;
struct {
int x : 1 + n - n;
} y;
passes with -pedantic -std=c99. Replacing that with 1 + n - n + n - n
is still OK with gcc; 1 + n + n - n - n is not.
So that's hardly an example of, well, anything.
It is an example of order of evaluation mattering when overflow
occurs.
What with game programming growing and growing in importance
I think it won't be long before saturated interger arithmetic
overflow will be encountered just as often as the 'conventional'
wrapping behavior.
--
Derek M. Jones tel: +44 (0) 1252 520 667
Knowledge Software Ltd mailto:derek@xxxxxxxxxxxx
Applications Standards Conformance Testing http://www.knosof.co.uk
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