[ 2019-01-20 Reflector prioritization ]

Set Priority to 2

Previous resolution [SUPERSEDED]:

This resolution is relative to N4750.

Change [istream.rvalue] as follows:

template <class charT, class traits Istream, class T>
  basic_istream<charT, traits>& Istream&&
  operator>>(basic_istream<charT, traits> Istream&& is, T&& x);

-1- Effects: Equivalent to:

is >> std::forward<T>(x)
return std::move(is);

-2- Remarks: This function shall not participate in overload resolution unless the expression is >> std::forward<T>(x) is well-formed, Istream is not an lvalue reference type, and Istream is derived from ios_base.

Change [ostream.rvalue]:

template <class charT, class traits Ostream, class T>
  basic_ostream<charT, traits>& Ostream&&
  operator<<(basic_ostream<charT, traits> Ostream&& os, const T& x);

-1- Effects: As if by: os << x;

-2- Returns: std::move(os)

-3- Remarks: This signature shall not participate in overload resolution unless the expression os << x is well-formed, Ostream is not an lvalue reference type, and Ostream is derived from ios_base.