// Illustrate use of "using" keyword in place of "typedef"

#include <iostream>
using namespace std;

// Define myfun to be a function with signature long int (&) (double, int&).
long int (myfun) (double d, int& k) {
   return (k += 2.5*d);
}

// Define "myFunType" with "using".  Use it to define myfun2.
using myFunType = long int (&) (double, int&);

// Use type name "myFunType" to define an alias "myfun2" for "myfun".
myFunType& myfun2 = myfun;

// Define alias myfun3 using an explicit type expression
long int (&myfun3) (double, int&) = myfun;

//--------------------------------------------------------------------
// Show that both aliases work
int main() {
    int k=5;
    cout << "myfun2() returns " << myfun2(1.0, k) << endl;
    cout << "k=" << k << endl;
    
    cout << "myfun3() returns " << myfun3(5.5, k) << endl; 
    cout << "k=" << k << endl;
}