//
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//
// G4DCofThisEvent
//
// Class description:
//
// This is a class which stores digi collections generated at one event.
// This class is exclusively constructed by G4DigiManager when the first
// digi collection of an event is passed to the manager, and this class
// object is deleted by G4RunManager when a G4Event class object is deleted.
// Almost all public methods must be used by Geant4 kernel classes and
// the user should not invoke them. The user can use two const methods,
// GetDC() and GetNumberOfCollections() for accessing to the stored digi
// collection(s).
//
// Author: Makoto Asai
// --------------------------------------------------------------------
#ifndef G4DCofThisEvent_h
#define G4DCofThisEvent_h 1

#include "G4Allocator.hh"
#include "G4VDigiCollection.hh"
#include "globals.hh"

#include <vector>

class G4DCofThisEvent
{
  public:

    G4DCofThisEvent();
    explicit G4DCofThisEvent(G4int cap);
    ~G4DCofThisEvent();
    G4DCofThisEvent(const G4DCofThisEvent&);
    G4DCofThisEvent& operator=(const G4DCofThisEvent&);

    inline void* operator new(std::size_t);
    inline void operator delete(void* anDCoTE);

    void AddDigiCollection(G4int DCID, G4VDigiCollection* aDC);

    // Returns a pointer to a digi collection.
    // Returns `nullptr` if the particular collection is not stored in the current event.
    // The integer argument is ID number which is assigned by G4DigiManager
    // and the number can be obtained by G4DigiManager::GetDigiCollectionID()
    // method.
    inline G4VDigiCollection* GetDC(G4int i) const { return (*DC)[i]; }

    // Return number of digi collections stored
    inline G4int GetNumberOfCollections() const
    {
      G4int n = 0;
      for (const G4VDigiCollection* dc : *DC) {
        if (dc != nullptr) ++n;
      }
      return n;
    }

    inline std::size_t GetCapacity() const { return DC->size(); }

  private:

    std::vector<G4VDigiCollection*>* DC;
};

#if defined G4DIGI_ALLOC_EXPORT
extern G4DLLEXPORT G4Allocator<G4DCofThisEvent>*& anDCoTHAllocator_G4MT_TLS_();
#else
extern G4DLLIMPORT G4Allocator<G4DCofThisEvent>*& anDCoTHAllocator_G4MT_TLS_();
#endif

inline void* G4DCofThisEvent::operator new(std::size_t)
{
  if (anDCoTHAllocator_G4MT_TLS_() == nullptr) {
    anDCoTHAllocator_G4MT_TLS_() = new G4Allocator<G4DCofThisEvent>;
  }
  return (void*)anDCoTHAllocator_G4MT_TLS_()->MallocSingle();
}

inline void G4DCofThisEvent::operator delete(void* anDCoTH)
{
  anDCoTHAllocator_G4MT_TLS_()->FreeSingle((G4DCofThisEvent*)anDCoTH);
}

#endif