H2D.h

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* (c) Copyright 1998-2026 CERN for the benefit of the LHCb and ATLAS collaborations *
*                                                                                   *
* This software is distributed under the terms of the Apache version 2 licence,     *
* copied verbatim in the file "LICENSE".                                            *
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#pragma once
 
#include "Generic2D.h"
#include <AIDA/IHistogram2D.h>
#include <Gaudi/Histograming/Sink/Utils.h>
#include <GaudiKernel/DataObject.h>
#include <TH2D.h>
 
#include <mutex>
#include <nlohmann/json.hpp>
 
namespace Gaudi {
  class Histogram1D;

  class GAUDI_API Histogram2D : public DataObject, public Generic2D<AIDA::IHistogram2D, TH2D> {
  public:
    Histogram2D();
    Histogram2D( TH2D* rep );

    bool fill( double x, double y, double weight = 1. ) override;
    virtual bool setBinContents( int binIndexX, int binIndexY, int entries, double height, double error, double centreX,
                                 double centreY );
    bool setRms( double rmsX, double rmsY );
    // overwrite reset
    bool reset() override;
    // free function reset
    friend void reset( Histogram2D& h ) { h.reset(); }
    friend void to_json( nlohmann::json& j, Histogram2D const& h ) { j = *h.m_rep.get(); }
    void copyFromAida( const AIDA::IHistogram2D& h );
    const CLID&        clID() const override { return classID(); }
    static const CLID& classID() { return CLID_H2D; }
 
  protected:
    // cache sumwx and sumwy  when setting contents since I don't have bin mean
    double m_sumwx = 0;
    double m_sumwy = 0;
 
  private:
    std::mutex m_fillSerialization;
  };
} // namespace Gaudi