Robert P. J. Day wrote:
just to stir the pot a bit regarding the discussion of the two
different ways to define macros, i've just noticed that the "({ })"
notation is not universally acceptable. i've seen examples where
using that notation causes gcc to produce:
error: braced-group within expression allowed only inside a function
i wasn't aware that there were limits on this notation. can someone
clarify this? under what circumstances *can't* you use that notation?
thanks.
Well, you can apparently not use it as a part of a constant expression
(which makes sense; do-while is illegal there too.) That would be the
only case in which an expression is permitted outside a function at all.
-hpa
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