#include <iostream>
using namespace std ;

//--------------------------------------------------------
//Universal Reference

template<typename T>
void f1(T&& param)
{
  cout << "param:" << param << " " <<
  typeid(T).name() << " " << typeid(param).name() << endl ;
  //*param = 100 ;
}



//--------------------------------------------------------

int main()
{
  int x1 = 27;             // x is an int
  const int cx = x1;       // cx is a const int
  const int& rx = x1;


    f1( x1 ) ;  //T is an int&. param is an  int&
                //Lvalue reference
    cout << x1 << endl ;


    f1( cx )  ; //T is a const int&. param is a const int&
                //Lvalue reference

    f1( rx )  ; //T is a const int& param is a const int&
                //Lvalue reference

    f1( 23 ) ;  //T is int param is a int&&
                // Rvalue reference

 return 0 ;
}


//--------------------------------------------------------