Observable.h

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#pragma once
#include <vector>
#include <unordered_map>
#include "Observer.h"
#include "vl_fwd.h"
 
namespace vl
{
    class Observer;
 
    class Observable
    {
        friend class Observer;
 
    public:
        Observable();
        bool Attach(Observer* o, const std::string& title = "");
        bool Detach(Observer* o);
        virtual ~Observable();
        virtual void Notify(vl::VarPtr info = nullptr);
        inline bool HasSubscribers() {
            if (auto subs = GetObservers())
                return !subs->empty(); // TODO get rid of this check
            return false;
        }
        const std::vector<Observer*>* GetObservers() const;
 
    protected:
        std::vector<Observer*>* GetObservers();
        void Unsubscribe(Observer* o);
 
    private:
        class ObserversStorage
        {
        public:
            //~ObserversStorage();
 
            inline std::unordered_map<Observable*, std::vector<Observer*>>& GetObservers() {
                return mObservers;
            }
        private:
            std::unordered_map<Observable*, std::vector<Observer*>> mObservers;
        };
 
        static ObserversStorage* mObserversStorage;
    };
}