InverseMultiMap.h

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/*
  Copyright (C) 2002-2023 CERN for the benefit of the ATLAS collaboration
*/
 
#ifndef INVERSEMULTIMAP_H
#define INVERSEMULTIMAP_H
 
#include <map>
#include "AthAllocators/ArenaPoolSTLAllocator.h"
 
namespace Trk {
template <class OrigMap, class CmpT = std::less<typename OrigMap::mapped_type>>
class InverseMultiMap
    : public std::multimap<
          typename OrigMap::mapped_type, typename OrigMap::key_type, CmpT,
          SG::ArenaPoolSTLAllocator<
              std::pair<const typename OrigMap::mapped_type, typename OrigMap::key_type>>> {};
 
//----------------------------------------------------------------
// And this is the code to fill an inverse map with data
template <class OrigMap, class CmpT>
void addToInverseMultiMap(InverseMultiMap<OrigMap, CmpT>* result,
                          const OrigMap& rec2truth) {
  for (const auto& p : rec2truth) {
    result->insert(std::make_pair(p.second, p.first));
  }
}
}  // namespace Trk
 
#endif /*INVERSEMULTIMAP_H*/