How Can I Perform Platform-Independent UTF-8 and Wide Character Conversions in C STL?

Platform-Independent UTF8 and Wide Character Conversion in STL

Converting between UTF8 strings in std::string and wide character strings in std::wstring is a common task when developing cross-platform applications. However, the limitations of the standard C library in this regard can pose challenges.

Fortunately, C 11 provides a solution with the introduction of the std::wstring_convert class. This class uses the std::codecvt template to perform the conversion using specific character encoding schemes.

For UTF8 to UTF16 conversion:

std::string source;
...
std::wstring_convert<std::codecvt_utf8_utf16<char16_t>, char16_t> convert;
std::u16string dest = convert.from_bytes(source);

For UTF16 to UTF8 conversion:

std::u16string source;
...
std::wstring_convert<std::codecvt_utf8_utf16<char16_t>, char16_t> convert;
std::string dest = convert.to_bytes(source);

This approach is platform-independent and provides a standard way to handle UTF8 and wide character conversions in STL.

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