(C question) (s - out.s) + func(&out) -> ?

[D. Hugh Redelmeier]

| From: William Park <opengeometry-FFYn/CNdgSA at public.gmane.org>

| Question for C expert...  Given the following

The order of operation is well-defined in C: operator precedence.

That says nothing about the order of evaluation of operands, only
about how they are combined.

Your code has a race condition and is undefined by the C standard.
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