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Strictly speaking they were introduced with C++11 (for std::*string) and C++17 (for std::*string_view) but std::u8string became available with C++20. We could use std::string, assuming that it is ...
I can now compile GlobalConstants.hh both with and without -std=c++11 or -std=gnu++11 which, arguably, is cleaner than asking gcc to clutter up its complex class with two more overloaded access ...