Joerg Wunsch wrote:
David Brown <david.br...@hesbynett.no> 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.
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