getEventNumber.h

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// -*- c++ -*-
/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
*/
 
#ifndef INDETTRACKSYSTEMATICSTOOLS_GETEVENTNUMBER_H
#define INDETTRACKSYSTEMATICSTOOLS_GETEVENTNUMBER_H
 
#ifndef XAOD_STANDALONE
#include <GaudiKernel/EventContext.h>
#include <GaudiKernel/ThreadLocalContext.h>
#else
#include "xAODEventInfo/EventInfo.h"
#include <stdexcept>
#endif
 
#include <cstdint>
 
namespace InDet {

template<typename Store>
inline uint64_t getEventNumber([[maybe_unused]] Store&& store) {
#ifndef XAOD_STANDALONE
    return Gaudi::Hive::currentContext().eventID().event_number();
#else
    const xAOD::EventInfo* ei = nullptr;
    if (!store || !store->retrieve(ei, "EventInfo").isSuccess() || !ei)
        throw std::runtime_error(
            "getEventNumber: failed to retrieve EventInfo");
    return ei->eventNumber();
#endif
}
 
} // namespace InDet
 
#endif