explicit wstring_convert( Codecvt* pcvt = new Codecvt ); (1) wstring_convert( Codecvt* pcvt, state_type state); (2) explicit wstring_convert( const byte_string& byte_err,
const wide_string& wide_err = wide_string() ); (3) wstring_convert(const std::wstring_convert&) = delete; (4) (since C++14)
1) Constructs the wstring_convert object with a specified conversion facet, using default-constructed values for the shift state and the er