Semi constant expressions

[Henry Spencer]

In article <10949 at smoke.BRL.MIL> gwyn at brl.arpa (Doug Gwyn) writes:
>>I believed then and now that anyone who depended on such things was
>>mad, and the recent examples have not convinced me otherwise.
>
>I think most of us would agree that it is "mad" to write such an
>expression.  However, C provides a preprocessor which is perfectly
>capable of rewriting an innocuous expression so that such a case
>results...

Dennis's objection may have been the same as the one I would have to such
an expression:  exploiting internal side effects at all is a lousy idea,
barring a few well-defined idioms (which don't run into this problem).
There are no "innocuous" expressions which can experience such rewriting,
although there are plenty of poorly-written ones which can.
-- 
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