#include <iostream>
#include <type_traits>
 
struct dummy {
 
      void one() { std::cout << "one\n"; }
 
      void two() & { std::cout << "two\n"; }
 
      void three() && { std::cout << "tree\n"; }
   }; 
 
namespace std {
 
template<typename _Res, typename... _ArgTypes>
    struct is_function<_Res(_ArgTypes...)&&>
    : public true_type { };
}
 
int main() {
   std::cout << std::boolalpha
             << std::is_member_function_pointer<decltype(&dummy::three)>::value 
             << std::endl;
}

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