What are reference qualifiers for functions? [duplicate]

Question

According to this webpage, a non-static member function can have a trailing & or && in its declaration. They have the following example

struct S {
    virtual int f(char) const, g(int) &&; // declares two non-static member functions
    };

1) Does the signature of the second function include the virtual?

virtual int g(int) &&

2) What is the meaning of the trailing &&?

Answer 1

struct S {
  virtual int f(char) const, g(int) &&;
};

struct D : S {
  virtual int f(char) const override;
  virtual int g(int) && override;
};

the above code compiles in both g++ and clang. This indicates, at least in practice, that g is virtual in S.

See What is "rvalue reference for *this"? for your other question.