Quick note on Implementation-Defined behaviour (was: C/Lua UB...)
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- Subject: Quick note on Implementation-Defined behaviour (was: C/Lua UB...)
- From: sur-behoffski <sur_behoffski@...>
- Date: Wed, 8 Sep 2021 11:34:21 +0930
G'day,
Thanks to all for the responses. I'll let the existing topic
lie, except to note one item in standards that I missed...
In addition to undefined behaviours, many Standards have
"Implementation Defined" behaviours, where (e.g. C) the language
does not try to shield the users from lower-level differences.
A simple case of this is ASCII versus EBCDIC, and the resulting
difference in e.g. regex range specifications ("[A-Z]" versus
"[[:upper:]]" in Grep; equivalently, "[A-Z]" versus "%u" in Lua).
'nuff said.
s-b etc