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\U0001F34C\U0002008A on cout :
\U0001F34C\U0002008A on wcout :
wcsnlen : 4
1 : 0xd83c
2 : 0xdf4c
3 : 0xd840
4 : 0xdc8a
wcsrtombs to char on cout :
Even though UCRT makes MSVC more compliant with the standard.
Each character above BMP on Windows is stored as a UTF-16 surrogate pairs. It looks like standard std::wcout on Windows is implemented in the way it can't display any of these characters.
Other than convert back from wchar_t to multibyte char (UTF-8), can we make Windows std::wcout display these kind of characters right away?