Defined in header <locale> template< class Codecvt,
class Elem = wchar_t,
class Wide_alloc = std::allocator<Elem>,
class Byte_alloc = std::allocator<char> >
class wstring_convert; (since C++11)
Class template std::wstring_convert performs conversions between byte string std::string and wide string std::basic_string<Elem>, using an individual code conversion facet Codecvt. std::wstring_convert assumes ownership of the con