iobservable.h

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#pragma once

#include "iobserver.h"
#include <vector>
#include <mutex>

namespace gg
{

class IObservable
{
protected:
    std::vector< IObserver * > _observers;

    std::mutex _observers_lock;

public:
    virtual ~IObservable();

public:
    virtual void attach(IObserver & observer);

    virtual void detach(IObserver & observer);

    virtual void notify(VideoFrame & frame) noexcept;

protected:
    bool attached(const IObserver & observer) const noexcept;
};

}