CaToolsLinkKey.h

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/* Copyright (C) 2022 GSI Helmholtzzentrum fuer Schwerionenforschung, Darmstadt
   SPDX-License-Identifier: GPL-3.0-only
   Authors: Sergei Zharko [committer] */
 
 
#ifndef CaToolsLinkKey_h
#define CaToolsLinkKey_h 1
 
#include "CaToolsDef.h"
 
#include <boost/functional/hash.hpp>
 
namespace cbm::ca::tools
{
  struct LinkKey {
    LinkKey(int index, int event, int file) : fIndex(index), fEvent(event), fFile(file) {}
 
    friend bool operator==(const LinkKey& lhs, const LinkKey& rhs)
    {
      return lhs.fFile == rhs.fFile && lhs.fEvent == rhs.fEvent && lhs.fIndex == rhs.fIndex;
    }
 
    int fIndex = cbm::algo::ca::constants::Undef<int>;  
    int fEvent = cbm::algo::ca::constants::Undef<int>;  
    int fFile  = cbm::algo::ca::constants::Undef<int>;  
  };
}  // namespace cbm::ca::tools
 
namespace std
{
  template<>
  struct hash<cbm::ca::tools::LinkKey> {
    std::size_t operator()(const cbm::ca::tools::LinkKey& key) const
    {
      std::size_t res = 0;
      boost::hash_combine(res, key.fFile);
      boost::hash_combine(res, key.fEvent);
      boost::hash_combine(res, key.fIndex);
      return res;
    }
  };
}  // namespace std
 
#endif  // CaToolsLinkKey_h