From: Edward Diener (eldiener_at_[hidden])
Date: 2020-04-07 19:33:58
In the xpressive header file c_ctype.h there are names such as _ALPHA,
_UPPER, _LOWER, _DIGIT etc. Where are these names declared or defined ?
I searched through all the Boost libraries and did not find any of these
names declared or defined anywhere. Are they supposed to be part of some
C++ standard header file ?
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