Printing UTF-8 strings since C++23

C++23 provides significant better support to print UTF-8 strings.

For example:

std::string s = "K\u00F6ln: 100\u20AC"; // string ö and €
 
std::println("{}", s);        // prints "Köln 100€"

// print hexadecimal code units (bytes of the UTF-8 string):
std::vector<char> v{std::from_range, s};
std::println("{:n:X}", v);    // prints 4B, C3, B6, 6C, 6E, 3A, 20, 31, 30, 30, E2, 82, AC

// new format specifier to interpret array of char as string:
std::println("{:?s}", v);     // prints "Köln 100€"

This even works fine on Windows platforms (using I/O streams or std::format() might print garbage with a native Windows compiler on a native Windows platform).

See sections 3.2.3 and 4.3.3 of [www.cppstd23.com](http://www.cppstd23.com) .

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