in impl/EnumFlagsDetails.h [166:174]
MY_ENUM_MAYBE_UNUSED inline bool isSingleFlag(NAME##Impl value) { \
switch (value) { \
BOOST_PP_SEQ_FOR_EACH(MY_ENUMFLAG_DETAILS_OP_SINGLE_FLAG_CHECK, \
NAME##Impl, BOOST_PP_TUPLE_TO_SEQ(__VA_ARGS__)) \
case NAME##Impl::none: \
break; \
} \
return false; \
} \