visitor.cpp

#include <iostream>
#include <fstream>
#include <string>
#include <vector>
#include <algorithm>

using namespace std;

class House;
class Bank;
class Factory;

class IVisitor abstract
{
public:
	virtual void VisitHouse(House* h) = 0;
	virtual void VisitBank(Bank* b) = 0;
	virtual void VisitFactory(Factory* f) = 0;
};

class AbstractBuilding abstract
{
	string Owner;
public:
	virtual void Accept(IVisitor* visitor)abstract;
	string GetOwner()
	{ 
		return Owner;
	}
	void SetOwner(string o)
	{
		this->Owner = o;
	}
};


class House : public AbstractBuilding
{
public:
	void Accept(IVisitor* visitor) override
	{
		visitor->VisitHouse(this);
	}
};

class Factory : public AbstractBuilding
{
public:
	void Accept(IVisitor* visitor) override
	{
		visitor->VisitFactory(this);
	}
};


class Bank : public AbstractBuilding
{
public:
	void Accept(IVisitor* visitor) override
	{
		visitor->VisitBank(this);
	}
};




class InsuranceAgent : public IVisitor
{
public:
	void VisitHouse(House* h) override
	{
		cout << "Offering medical insurance House owner: " << h->GetOwner() << endl;
	}

	void VisitBank(Bank* b) override
	{
		cout << "Offering robbery insurance Bank owner: " << b->GetOwner() << endl;
	}

	void VisitFactory(Factory* f) override
	{
		cout << "Offering fire or flood insurance Factory owner: " << f->GetOwner() << endl;
	}
};



class City
{
	vector<AbstractBuilding*> buildings;
public:
	void Add(AbstractBuilding* b) {buildings.push_back(b);}
	void Accept(IVisitor* visitor)
	{
		for (auto b : buildings) b->Accept(visitor);
	}
};


int main()
{
	City city;
	House* h = new House;
	h->SetOwner("Yaroslav Posinko");
	Bank* b = new Bank;
	b->SetOwner("Privat Bank");
	Factory* f = new Factory;
	f->SetOwner("Steel wokres");
	
	city.Add(h); 
	city.Add(b);
	city.Add(f);

	InsuranceAgent agent;
	city.Accept(&agent);


	delete h;
	delete b;
	delete f;
	


	system("pause");
}