#include <iostream>
  
class SimpleCat
{
public:
    SimpleCat();
    SimpleCat(SimpleCat&);
    ~SimpleCat();
  
    int GetAge() const { return itsAge; }
    void SetAge(int age) { itsAge = age; }
  
private:
    int itsAge;
};
  
SimpleCat::SimpleCat()
{
    std::cout << "Simple Cat Constructor...\n";
    itsAge = 1;
}
  
SimpleCat::SimpleCat(SimpleCat&)
{
    std::cout << "Simple Cat Copy Constructor...\n";
}
  
SimpleCat::~SimpleCat()
{
    std::cout << "Simple Cat Destructor...\n";
}
  
const SimpleCat & FunctionTwo (const SimpleCat & theCat);
  
int main()
{
    std::cout << "Making a cat...\n";
    SimpleCat Frisky;
    std::cout << "Frisky is " << Frisky.GetAge() 
              << " years old\n";
  
    int age = 5;
    Frisky.SetAge(age);
    std::cout << "Frisky is " << Frisky.GetAge() 
              << " years old\n";
  
    std::cout << "Calling FunctionTwo...\n";
    std::cout << "Address of Frisky before: " << &Frisky << "\n";
    FunctionTwo(Frisky);
    std::cout << "Address of Frisky after: " << &Frisky << "\n";
    std::cout << "Frisky is " << Frisky.GetAge() 
              << " years old\n";
    return 0;
}
   
// functionTwo passes a ref to a const object
const SimpleCat & FunctionTwo (const SimpleCat & theCat)
{
    std::cout << "Function Two. Returning...\n";
    std::cout << "Frisky is now " << theCat.GetAge()
              << " years old \n";
    // theCat.SetAge(8);   const!
    return theCat;
}