CD_ParticleMap.H

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/*
 * SPDX-FileCopyrightText: 2021-2026 SINTEF Energy Research
 *
 * SPDX-License-Identifier: GPL-3.0-or-later
 */
 
#ifndef CD_PARTICLEMAP_H
#define CD_PARTICLEMAP_H
 
// Std includes
#include <cstdint>
#include <utility>
#include <unordered_map>
#include <map>
 
// Our includes
#include <CD_NamespaceHeader.H>
 
// Compile-time sanity checks (optional but nice)
static_assert(sizeof(uint32_t) == 4, "uint32_t must be 32 bits");
static_assert(sizeof(uint64_t) == 8, "uint64_t must be 64 bits");
static_assert(sizeof(size_t) == 8, "size_t must be 64 bits");
 
static inline uint64_t
encodePair(uint32_t a_level, uint32_t a_gridIndex) noexcept
{
  return (std::uint64_t(a_level) << 32) | std::uint64_t(a_gridIndex);
}
 
static inline std::pair<uint32_t, uint32_t>
decodePair(uint64_t key) noexcept
{
  return {uint32_t(key >> 32), uint32_t(key)};
}
 
struct PairHash
{
  std::size_t
  operator()(const std::pair<uint32_t, uint32_t>& p) const noexcept
  {
    return encodePair(p.first, p.second);
  }
};
 
template <typename T>
using ParticleMap = std::unordered_map<std::pair<uint32_t, uint32_t>, T, PairHash>;
 
#include <CD_NamespaceFooter.H>
 
#endif