pointer-to-member-function type requires an rvalue

Question

What is the matter of the error, which produces the following code?

struct foo
{
    void call(void (foo::*ptr)()) &&
    {
        (*this.*ptr)();
    }
};

How to fix this error?

Answer 1

Since the member pointer has the rvalue qualifier, the compiler must be told that *this is to be treated as an rvalue by using std::move on it:

(std::move(*this).*ptr)();