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Author: sunmeat

BodyPart.cpp

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+#include "BodyPart.h"
+
+BodyPart::BodyPart(Brain* brain)
+{
+	this->brain = brain;
+}
+
+void BodyPart::changed()
+{
+	brain->somethingHappenedToBodyPart(this);
+}

BodyPart.h

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+#pragma once
+#include "Brain.h"
+
+// sbstract base collegue
+class BodyPart abstract
+{
+protected:
+	Brain* brain; // body part knows about brain (mediator)
+
+public:
+	BodyPart(Brain* brain);
+	virtual void changed();
+};

Brain.cpp

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+#include "Brain.h"
+
+#include "Ear.h"
+#include "Eye.h"
+#include "Face.h"
+#include "Hand.h"
+#include "Leg.h"
+
+Brain::Brain()
+{
+	createBodyParts();
+}
+
+class Ear;
+
+void Brain::createBodyParts()
+{
+	ear = new Ear(this);
+	eye = new Eye(this);
+	face = new Face(this);
+	hand = new Hand(this);
+	leg = new Leg(this);
+}
+
+
+void Brain::somethingHappenedToBodyPart(BodyPart* bodyPart)
+{
+	// I'm so sorry, Barbara Liskov ;)
+	if (dynamic_cast<Ear*>(bodyPart) != nullptr)
+	{
+		string heardSounds = ((Ear*)bodyPart)->getSounds();
+
+		if (heardSounds.find("stupid") != std::string::npos)
+		{
+			// attacking offender
+			leg->stepForward();
+			hand->hitPersonNearYou();
+			leg->kick();
+		}
+		else if (heardSounds.find("cool") != std::string::npos)
+		{
+			face->smile();
+		}
+		else
+		{
+			cout << "OK, I give you another try\n";
+		}
+	}
+	else if (dynamic_cast<Eye*>(bodyPart) != nullptr)
+	{
+		cout << "brain can analyze what you see and can react appropriately using different body parts\n";
+	}
+	else if (dynamic_cast<Hand*>(bodyPart) != nullptr)
+	{
+		Hand* h = (Hand*)bodyPart;
+
+		if (hand->doesItHurt())
+		{
+			leg->stepBack();
+		}
+		else if (hand->isItNice()) {
+			leg->stepForward();
+			hand->embrace();
+		}
+		else
+		{
+			cout << "OK, you can touch this :)\n";
+		}
+	}
+	else if (dynamic_cast<Leg*>(bodyPart) != nullptr)
+	{
+		cout << "leg can also feel something if you would like it to\n";
+	}
+}

Brain.h

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+#pragma once
+
+class Ear;
+class Eye;
+class Face;
+class Hand;
+class Leg;
+class BodyPart;
+
+// Mediator
+class Brain
+{
+public:
+	Ear* ear;
+	Eye* eye;
+	Face* face;
+	Hand* hand;
+	Leg* leg;
+public:
+	Brain();
+private:
+	void createBodyParts();
+public:
+	void somethingHappenedToBodyPart(BodyPart* bodyPart);
+};

Ear.cpp

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+#include "Ear.h"
+
+Ear::Ear(Brain* brain) : BodyPart(brain) {}
+
+void Ear::hearSomething()
+{
+	cout << "Enter what you hear (try to type \"cool\" or \"stupid\"): ";
+	getline(cin, sounds);
+
+	changed();
+}
+
+string Ear::getSounds()
+{
+	return sounds;
+}

Ear.h

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+#pragma once
+#include <iostream>
+#include <string>
+using namespace std;
+
+#include "Brain.h"
+#include "BodyPart.h"
+
+class Ear : public BodyPart
+{
+	string sounds;
+public:
+	Ear(Brain* brain);
+	void hearSomething();
+	string getSounds();
+};

Eye.cpp

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+#include "Eye.h"
+
+Eye::Eye(Brain* brain) : BodyPart(brain) {}
+
+void Eye::seeSomething()
+{
+	cout << "Enter what you see: ";
+	getline(cin, thingsAround);
+
+	changed();
+}

Eye.h

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+#pragma once
+#include <iostream>
+#include <string>
+using namespace std;
+
+#include "Brain.h"
+#include "BodyPart.h"
+
+class Eye : public BodyPart
+{
+	string thingsAround;
+public:
+	Eye(Brain* brain);
+	void seeSomething();
+};

Face.cpp

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+#include "Face.h"
+
+Face::Face(Brain* brain) : BodyPart(brain) {}
+
+void Face::smile()
+{
+	cout << "FACE: Smiling :)\n";
+}

Face.h

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+#pragma once
+#include <iostream>
+using namespace std;
+
+#include "Brain.h"
+#include "BodyPart.h"
+
+class Face : public BodyPart
+{
+public:
+	Face(Brain* brain);
+	void smile();
+};

Hand.cpp

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+#include "Hand.h"
+
+Hand::Hand(Brain* brain) : BodyPart(brain) {}
+
+void Hand::feelSomething()
+{
+	cout << "What you feel is soft? (Yes/No) ";
+	string answer;
+	cin >> answer;
+
+	if (answer != "" && answer[0] == 'Y')
+	{
+		isSoft = true;
+	}
+
+	cout << "What you feel is hurting? (Yes/No) ";
+	cin >> answer;
+	if (answer != "" && answer[0] == 'Y')
+	{
+		isHurting = true;
+	}
+
+	changed();
+}
+
+void Hand::hitPersonNearYou()
+{
+	cout << "HAND: Just hit offender...\n"; // ñòóêíóòü îáèä÷èêà
+}
+
+void Hand::embrace()
+{
+	cout << "HAND: Embracing what is in front of you...\n"; // îáíèìàøêè
+}
+
+bool Hand::doesItHurt()
+{
+	return isHurting;
+}
+
+bool Hand::isItNice()
+{
+	return !isHurting && isSoft;
+}

Hand.h

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+#pragma once
+#include <iostream>
+using namespace std;
+
+#include "Brain.h"
+#include "BodyPart.h"
+
+class Hand : public BodyPart
+{
+	bool isSoft;
+	bool isHurting;
+
+public:
+	Hand(Brain* brain);
+	void feelSomething();
+	void hitPersonNearYou();
+	void embrace();
+	bool doesItHurt();
+	bool isItNice();
+};

Leg.cpp

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+#include "Leg.h"
+
+Leg::Leg(Brain* brain) : BodyPart(brain) {}
+
+
+void Leg::kick()
+{
+	cout << "LEG: Just kicked offender in front of you...\n";
+}
+
+void Leg::stepBack()
+{
+	cout << "LEG: Stepping back...\n";
+}
+
+void Leg::stepForward()
+{
+	cout << "LEG: Stepping forward...\n";
+}

Leg.h

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+#pragma once
+#include <iostream>
+using namespace std;
+
+#include "Brain.h"
+#include "BodyPart.h"
+
+class Leg : public BodyPart
+{
+public:
+	Leg(Brain* brain);
+	void kick();
+	void stepBack();
+	void stepForward();
+};

Main.cpp

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+#include <iostream>
+using namespace std;
+
+#include "Brain.h"
+#include "BodyPart.h"
+#include "Ear.h"
+#include "Eye.h"
+#include "Face.h"
+#include "Hand.h"
+#include "Leg.h"
+
+// http://cpp-reference.ru/patterns/behavioral-patterns/mediator/
+
+int main()
+{
+	system("title Mediator Pattern Example");
+
+	Brain* human = new Brain();
+
+	string line = "start";
+
+	while (line != "")
+	{
+		cout << "Enter body part ('ear','eye','hand' or empty to exit): ";
+		getline(cin, line);
+
+		if (line == "ear" || line == "Ear")
+		{
+			human->ear->hearSomething();
+		}
+		else if (line == "Eye" || line == "eye")
+		{
+			human->eye->seeSomething();
+		}
+		else if (line == "Hand" || line == "hand")
+		{
+			human->hand->feelSomething();
+		}
+		// ...
+	}
+}