Convert wstring to string encoded in UTF-8
You can use boost's utf_to_utf converter to get char format to store in std::string.
std::string myresult = boost::locale::conv::utf_to_utf<char>(my_wstring);
What's your platform? Note that Windows does not support UTF-8 locales so this may explain why you're failing.
To get this done in a platform dependent way you can use MultiByteToWideChar/WideCharToMultiByte on Windows and iconv on Linux. You may be able to use some boost magic to get this done in a platform independent way, but I haven't tried it myself so I can't add about this option.
The code below might help you :)
#include <codecvt>
#include <string>
// convert UTF-8 string to wstring
std::wstring utf8_to_wstring (const std::string& str)
{
std::wstring_convert<std::codecvt_utf8<wchar_t>> myconv;
return myconv.from_bytes(str);
}
// convert wstring to UTF-8 string
std::string wstring_to_utf8 (const std::wstring& str)
{
std::wstring_convert<std::codecvt_utf8<wchar_t>> myconv;
return myconv.to_bytes(str);
}