HistDelta.h

/**************************************************************************
 * basf2 (Belle II Analysis Software Framework)                           *
 * Author: The Belle II Collaboration                                     *
 *                                                                        *
 * See git log for contributors and copyright holders.                    *
 * This file is licensed under LGPL-3.0, see LICENSE.md.                  *
 **************************************************************************/
#pragma once
 
#include <TH1.h>
#include <queue>
#include <vector>
 
namespace Belle2 {

  class HistDelta {
  public:
    enum EDeltaType { c_Disabled = 0, c_Entries = 1, c_Underflow = 2, c_Events = 3};
    EDeltaType m_type{c_Disabled}; 
    int m_parameter{0}; 
    unsigned int m_amountDeltas{}; 
    std::unique_ptr<TH1> m_lastHist{nullptr};
    int m_lastValue{0}; 
    std::vector<std::unique_ptr<TH1>> m_deltaHists;
    bool m_updated{false};
  public:

    explicit HistDelta(EDeltaType t = c_Disabled, int p = 0, unsigned int a = 0);

    ~HistDelta();

    void set(EDeltaType t, int p, unsigned int a);

    void setNotUpdated(void) {m_updated = false;};

    void update(const TH1* hist);

    void reset(void);

    TH1* getDelta(unsigned int n = 0, bool onlyIfUpdated = true) const;
  };

}