Observer.h

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#pragma once
#include "Export"
#include <vector>
#include <algorithm>

namespace vreckoUtils
{

class Observable;

class VRECKO_UTILS_EXPORT Observer
{
public:
    virtual void notify(Observable* object, void* userData) = 0;
protected:
    Observer() {};
};

class VRECKO_UTILS_EXPORT Observable
{
public:
    void addObserver(Observer* observer) {
        _observers.push_back(observer);
    }
    void removeObserver(Observer* observer) {
        auto it = std::find(_observers.begin(), _observers.end(), observer);
        if(it != _observers.end()) _observers.erase(it);
    }
    void notifyObservers(void* userData = NULL) {
        for(auto it = _observers.begin(); it != _observers.end(); ++it)
            (*it)->notify(this, userData);
    }

protected:
    Observable() {};
    std::vector<Observer*> _observers;
};

}