XXH.h

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// This file's extension implies that it's C, but it's really -*- C++ -*-.
/*
 * Copyright (C) 2023 CERN for the benefit of the ATLAS collaboration.
 */
#ifndef CXXUTILS_XXH_H
#define CXXUTILS_XXH_H
 
#include <cstdint>
#include <type_traits>

namespace xxh3 {

std::uint64_t hash64(const void* data, std::size_t size);

template <typename Cont>
std::uint64_t hash64(const Cont& cont) {
  return hash64(cont.data(), cont.size() * sizeof(typename Cont::value_type));
}

template <typename POD,
          typename = std::enable_if_t<std::is_standard_layout_v<POD> &&
                                      std::is_trivial_v<POD>>>
std::uint64_t hash64(const POD& pod) {
  return hash64(&pod, sizeof(POD));
}
}  // namespace xxh3
 
#endif  // CXXUTILS_XXH_H