#include <iostream>
  
class Tricycle
{
public:
    Tricycle();
    // copy constructor and destructor use default
    int getSpeed() const { return *speed; }
    void setSpeed(int newSpeed) { *speed = newSpeed; }
    Tricycle operator=(const Tricycle&);
  
private:
    int *speed;
};
  
Tricycle::Tricycle()
{
    speed = new int;
    *speed = 5;
}
  
Tricycle Tricycle::operator=(const Tricycle& rhs)
{
    if (this == &rhs)
        return *this;
    delete speed;
    speed = new int;
    *speed = rhs.getSpeed();
    return *this;
}
  
int main()
{
    Tricycle wichita;
    std::cout << "Wichita's speed: " << wichita.getSpeed() 
        << "\n";
    std::cout << "Setting Wichita's speed to 6 ...\n";
    wichita.setSpeed(6);
    Tricycle dallas;
    std::cout << "Dallas' speed: " << dallas.getSpeed() 
        << "\n";
    std::cout << "Copying Wichita to Dallas ...\n";
    wichita = dallas;
    std::cout << "Dallas' speed: " << dallas.getSpeed() 
        << "\n";
    return 0;
}