[avr-gcc-list] Re: Inline vs. ? : operator

[David Brown]

Joerg Wunsch wrote:
> David Brown <address@hidden> wrote:
>
> > Evaluating the result of "p |= BIT(b)" means carrying out the
> > or-assign, then reading the value of p and returning it.
>
> You're right, I stand corrected.

That's certainly how /I/ interpret the way volatile works in such cases. 
 I believe there is some uncertainty about how it should work in C++ - 
the same statement /may/ have a different interpretation in C and C++ 
when volatiles are sort-of read in this way.

All in all, the fact that even experts are not always accurate in such 
cases suggests that you should stay well away from such code - an 
explicit "if" is clear, works exactly as intended, and in some cases 
gives noticeably better code than a logically equivalent "?:" expression.