Convert Between UTF-8 and UTF 16

utf_conversion.h

#include <codecvt>
#include <string>
using namespace std;

// UTF-16 to UTF-8 (variable-width encoding) string conversion.
// NOTE: This will throw a range_error exception if the input is invalid.
inline string narrow(const wstring& utf16Source)
{
    wstring_convert<codecvt_utf8_utf16<wchar_t>> converter;
    return converter.to_bytes(utf16Source);
}

// UTF-8 to UTF-16 string (variable-width encoding) conversion.
// NOTE: This will throw a range_error exception if the input is invalid.
inline wstring widen(const string& utf8Source)
{
    wstring_convert<codecvt_utf8_utf16<wchar_t>> converter;
    return converter.from_bytes(utf8Source);
}