LArRodIdHash.h

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/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
*/
 
/********************************************************************
 
 NAME:     LArRodIdHash.h
 PACKAGE:  Trigger/TrigAlgorithms/TrigT2CaloCommon
 
 AUTHOR:   Denis Oliveira Damazio
 
 PURPOSE:  LArReadoutModuleID to integer (hash ID) mapping.
 *******************************************************************/
 
#ifndef TRIGT2CALOCOMMON_LARRODIDHASH_H
#define TRIGT2CALOCOMMON_LARRODIDHASH_H
 
#include <vector> 
#include <unordered_map>
 
class HWIdentifier;

class LArRodIdHash  {
 
 public:

  using ID = unsigned int;

  void initialize(int offset, const std::vector<HWIdentifier>& roms ); 

  size_t operator() (ID id) const ;

  size_t max() const { return m_int2id.size(); }

  ID identifier(size_t i) const { return m_int2id[i]; }

  int offset() const { return m_offset; }
 
 private:

  std::unordered_map<ID, size_t> m_lookup ;

  std::vector<ID> m_int2id;
 
  int m_offset{0};
 
};
 
#endif