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// Class template for accumulables handled by Geant4 analysis
//
// Author: Ivana Hrivnacova, 07/09/2015  (ivana@ipno.in2p3.fr)

#ifndef G4Accumulable_h
#define G4Accumulable_h 1

#include "G4VAccumulable.hh"
#include "G4MergeMode.hh"

#include "globals.hh"

template <typename T>
class G4Accumulable : public G4VAccumulable
{
  public:
    G4Accumulable(const G4String& name, T initValue, 
                G4MergeMode mergeMode = G4MergeMode::kAddition);
    G4Accumulable(T initValue, 
                G4MergeMode mergeMode = G4MergeMode::kAddition);
    G4Accumulable(const G4Accumulable& rhs);
    G4Accumulable() = delete;
    virtual ~G4Accumulable();

    // operators
    G4Accumulable<T>& operator= (const G4Accumulable<T>& rhs);
    G4Accumulable<T>& operator+=(const G4Accumulable<T>& rhs);
    G4Accumulable<T>& operator*=(const G4Accumulable<T>& rhs);
    G4Accumulable<T>  operator++(int); // postfix increment
    G4Accumulable<T>& operator++();    // prefix increment

    G4Accumulable<T>& operator= (const T& rhs);
    G4Accumulable<T>& operator+=(const T& rhs);
    G4Accumulable<T>& operator*=(const T& rhs);

    // methods
    virtual void Merge(const G4VAccumulable& other) final;
    virtual void Reset() final;

    // get methods
    T  GetValue() const;
    G4MergeMode GetMergeMode() const;

  private:
    // data members
    T  fValue;
    T  fInitValue;
    G4MergeMode  fMergeMode;
    G4MergeFunction<T> fMergeFunction;
 };

// inline functions

#include "G4Accumulable.icc"

#endif
