GNotifier.h

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#ifndef GRUTNOTIFIER_H
#define GRUTNOTIFIER_H
 
#ifndef __CINT__
#include <functional>
#endif
 
#include "TNamed.h"
 
class GNotifier : public TNamed {
public:
   static GNotifier* Get();
   ~GNotifier() = default;
 
   void Print(Option_t* = "") const override {}
   void Clear(Option_t* = "") override {}
   bool Notify() override;
 
#ifdef __CINT__
   static void AddCallback(void (*func)());
#else
   template <typename T>
   static void AddCallback(T callback)
   {
      Get()->fCallbacks.push_back(callback);
   }
 
   static void AddCallback(void (*func)()) { Get()->fCallbacks.emplace_back(func); }
#endif
 
private:
   GNotifier()                                = default;
   GNotifier(const GNotifier&)                = default;
   GNotifier(GNotifier&&) noexcept            = default;
   GNotifier& operator=(const GNotifier&)     = default;
   GNotifier& operator=(GNotifier&&) noexcept = default;
 
#ifndef __CINT__
   std::vector<std::function<void()>> fCallbacks;
#endif
 
   static GNotifier* fGNotifier;
 
   /// /cond CLASSIMP
   ClassDefOverride(GNotifier, 0)   // NOLINT(readability-else-after-return)
                                    /// /endcond
};
 
#endif