CxxUtils/CxxUtils/sgkey_t.h

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// This file's extension implies that it's C, but it's really -*- C++ -*-.
/*
  Copyright (C) 2002-2023 CERN for the benefit of the ATLAS collaboration
*/
#ifndef CXXUTILS_SGKEY_T_H
#define CXXUTILS_SGKEY_T_H
 
 
#include <cstdint>
#include <cstddef>
#include <unordered_map>
#include <unordered_set>
 
 
namespace SG {
 
 
typedef uint32_t sgkey_t;
 
 
inline
constexpr bool sgkeyEqual (const sgkey_t a, const sgkey_t b)
{
  return a == b;
}
 
 
inline
constexpr bool sgkeyLess (const sgkey_t a, const sgkey_t b)
{
  return a < b;
}
 
 
struct SGKeyHash
{
  inline
  constexpr size_t operator() (const sgkey_t k) const
  {
    return k;
  }
};
 
 
struct SGKeyEqual
{
  inline
  constexpr bool operator() (const sgkey_t a, const sgkey_t b) const
  {
    return sgkeyEqual (a, b);
  }
};
 
 
inline
constexpr uint32_t sgkeyShort (const sgkey_t k)
{
  return k;
}
 
 
template <class T>
using SGKeyMap = std::unordered_map<sgkey_t, T>;
 
 
using SGKeySet = std::unordered_set<sgkey_t>;
 
 
} // namespace SG
 
 
#endif // not CXXUTILS_SGKEY_T_H