Regarding C++, there can be no macro definitions in the members of a class.

Regarding the second c++-specific problem:
preprocessing: header file inclusion, macro replacement, conditional compilation, delete comments, no syntax check
because of preprocessing, macro replacement is required, but C++ cannot access classes in the pre-compilation stage Member, so macro substitution is not possible in C++.
Therefore, in C++, there can be no macro definitions in the members of the class.