How to Convert Between UTF-8 and Wide Character Strings in C ?

UTF8 to/from Wide Char Conversion in STL

Converting Unicode text represented as UTF-8 strings in std::string to wide character strings in std::wstring and vice versa is essential for platform-independent programming. Here's how to achieve this using the C Standard Library:

UTF-8 to UTF-16

C 11 introduced std::wstring_convert, which facilitates conversions between narrow and wide character strings:

std::string utf8Source;
...
std::wstring_convert<std::codecvt_utf8_utf16<char16_t>, char16_t> converter;
std::u16string utf16Destination = converter.from_bytes(utf8Source);

UTF-16 to UTF-8

The conversion from UTF-16 to UTF-8 is similar:

std::u16string utf16Source;
...
std::wstring_convert<std::codecvt_utf8_utf16<char16_t>, char16_t> converter;
std::string utf8Destination = converter.to_bytes(utf16Source);

This approach utilizes the C Standard Library's powerful std::wstring_convert facility, offering a standardized and efficient solution for multi-platform UTF8-wide char conversions.

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