#include <iostream>

#include "ObserverPattern.cpp"

///////////////////EXAMPLE USAGE IN SIMPLISTIC PSEUDO-MVC ARCHITECTURE:

class AnInt: public Observable

{

private:

int num;

public:

AnInt(){ num = 0; }

void setInfo(int num)

{

this->num = num;

notifyObservers();

}

int getNum(){ return num; }

};

class NumWatcherView

{

public:

void showNum(int num) //interface override

{

std::cout<<"There is a new number: "<<num<<std::endl;

}

};

class AlertView

{

private:

bool isNegative(int num)

{

return num < 0;

}

public:

void checkAlerts(int num)

{

if(isNegative(num))

{

std::cout<<"ALERT! "<<num<<" is negative!"<<std::endl;

}

}

};

class NumberController: public IObserver

{

private:

AnInt current;

AlertView alerts;

NumWatcherView output;

public:

NumberController()

{

current.addObserver(this);

}

void set(int x)

{

current.setInfo(x);

}

void update()

{

output.showNum(current.getNum());

alerts.checkAlerts(current.getNum());

}

};

//the user's actions

int main()

{

NumberController example;

example.set(100);

example.set(10);

example.set(-1);

example.set(0);

return 0;

}