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#include "iostream"
#include "string"
 
using namespace std;
 
int main()
{
    std::cout << "Object Oriented Pattern:\n\n";
 
    MallardDuck Duck1;
    Duck1.fly();
    Duck1.quack();
 
    RubberDuck Duck2;
    Duck2.fly();
    Duck2.quack();
 
    std::cin.get();
    return 0;
};
 
class IFlyBehavior
{
public:
    virtual void fly();
};
 
class IQuackBehavior
{
public:
    virtual void quack();
};
 
class Duck
{
protected:
    IFlyBehavior FlyBehavior;
    IQuackBehavior QuackBehavior;
 
public:
    void fly()
    {
        FlyBehavior.fly();
    }
    void quack()
    {
        QuackBehavior.quack();
    }
};
 
class RubberDuck : Duck
{
public:
    RubberDuck() : Duck()
    {
        NoFly FlyBehavior;
        Squeak QuackBehavior;
    }
};
 
class MallardDuck : Duck
{
public:
    MallardDuck() : Duck()
    {
        FlyWithWings FlyBehavior;
        Quack QuackBehavior;
    }
    ~MallardDuck() { };
};
 
class FlyWithWings : IFlyBehavior
{
    void fly()
    {
        cout << "Flapping wings.";
    }
};
 
class NoFly : IFlyBehavior
{
    void fly()
    {
        cout << "Can't fly.";
    }
};
 
class Quack : IQuackBehavior
{
    void quack()
    {
        cout << "Quack!";
    }
};
 
class Squeak : IQuackBehavior 
{
    void quack()
    {
        cout << "Squeak!";
    }
};

prog.cpp: In function ‘int main()’:
prog.cpp:11:5: error: ‘MallardDuck’ was not declared in this scope
     MallardDuck Duck1;
     ^~~~~~~~~~~
prog.cpp:12:5: error: ‘Duck1’ was not declared in this scope
     Duck1.fly();
     ^~~~~
prog.cpp:15:5: error: ‘RubberDuck’ was not declared in this scope
     RubberDuck Duck2;
     ^~~~~~~~~~
prog.cpp:16:5: error: ‘Duck2’ was not declared in this scope
     Duck2.fly();
     ^~~~~
prog.cpp: In constructor ‘RubberDuck::RubberDuck()’:
prog.cpp:57:9: error: ‘NoFly’ was not declared in this scope
         NoFly FlyBehavior;
         ^~~~~
prog.cpp:58:9: error: ‘Squeak’ was not declared in this scope
         Squeak QuackBehavior;
         ^~~~~~
prog.cpp: In constructor ‘MallardDuck::MallardDuck()’:
prog.cpp:67:9: error: ‘FlyWithWings’ was not declared in this scope
         FlyWithWings FlyBehavior;
         ^~~~~~~~~~~~
prog.cpp:68:9: error: ‘Quack’ was not declared in this scope
         Quack QuackBehavior;
         ^~~~~

Standard output is empty