lesson_1

lesson_1/src/duck.hpp

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+/*
+ * duck.hpp
+ *
+ *  Created on: 18 окт. 2021 г.
+ *      Author: alexander
+ */
+
+#pragma once
+
+#include <iostream>
+
+class Duck
+{
+protected:
+    FlyBehavior *flyBehavior;
+    QuackBehavior *quackBehavior;
+public:
+    void performQuack()
+    {
+        quackBehavior->quack();
+    }
+
+    void performFly()
+    {
+        flyBehavior->fly();
+    }
+
+    void swim()
+    {
+        std::cout << "All ducks float, even decoys!" << std::endl;
+    }
+
+    virtual void display() { }
+
+    void setFlyBehavior(FlyBehavior *fb)
+    {
+        if (flyBehavior)
+        {
+            delete flyBehavior;
+        }
+
+        flyBehavior = fb;
+    }
+
+    void setQuackBehavior(QuackBehavior *qb)
+    {
+        if (quackBehavior)
+        {
+            delete quackBehavior;
+        }
+
+        quackBehavior = qb;
+    }
+
+    virtual ~Duck()
+    {
+        if (flyBehavior)
+        {
+            delete flyBehavior;
+        }
+
+        if (quackBehavior)
+        {
+            delete quackBehavior;
+        }
+    }
+};
+
+class MallardDuck : public Duck
+{
+public:
+    MallardDuck()
+    {
+        quackBehavior = new Quack;
+        flyBehavior = new FlyWithWings;
+    }
+};
+
+class ModelDuck : public Duck
+{
+public:
+    ModelDuck()
+    {
+        flyBehavior = new FlyNoWay;
+        quackBehavior = new Quack;
+    }
+
+    void display()
+    {
+        std::cout << "I'm a model duck" << std::endl;
+    }
+};

lesson_1/src/fly_behavior.hpp

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+/*
+ * fly_behavior.hpp
+ *
+ *  Created on: 18 окт. 2021 г.
+ *      Author: alexander
+ */
+
+#pragma once
+
+#include <iostream>
+
+class FlyBehavior
+{
+public:
+    virtual void fly() = 0;
+    virtual ~FlyBehavior() { }
+};
+
+class FlyWithWings : public FlyBehavior
+{
+public:
+    void fly()
+    {
+        std::cout << "I'm flying!" << std::endl;
+    }
+};
+
+class FlyNoWay : public FlyBehavior
+{
+public:
+    void fly()
+    {
+        std::cout << "I can't fly" << std::endl;
+    }
+};
+
+class FlyRocketPowered : public FlyBehavior
+{
+public:
+    void fly()
+    {
+        std::cout << "I'm flying with a rocket!" << std::endl;
+    }
+};

lesson_1/src/main.cpp

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+/*
+ * main.cpp
+ *
+ *  Created on: 18 окт. 2021 г.
+ *      Author: alexander
+ */
+
+#include "fly_behavior.hpp"
+#include "quack_behavior.hpp"
+#include "duck.hpp"
+
+int main()
+{
+    Duck *mallard = new MallardDuck;
+    mallard->performQuack();
+    mallard->performFly();
+
+    Duck *model = new ModelDuck;
+    model->performFly();
+    model->setFlyBehavior(new FlyRocketPowered);
+    model->performFly();
+
+    delete mallard;
+    delete model;
+
+    return 0;
+}

lesson_1/src/quack_behavior.hpp

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+/*
+ * quack_behavior.hpp
+ *
+ *  Created on: 18 окт. 2021 г.
+ *      Author: alexander
+ */
+
+#pragma once
+
+#include <iostream>
+
+class QuackBehavior
+{
+public:
+    virtual void quack() = 0;
+    virtual ~QuackBehavior() { }
+};
+
+class Quack : public QuackBehavior
+{
+public:
+    void quack()
+    {
+        std::cout << "Quack" << std::endl;
+    }
+};
+
+class Squeak : public QuackBehavior
+{
+public:
+    void quack()
+    {
+        std::cout << "Squeak" << std::endl;
+    }
+};
+
+class MuteQuack : public QuackBehavior
+{
+public:
+    void quack()
+    {
+        std::cout << "<< Silence >>" << std::endl;
+    }
+};