LCC08CellHandlerUtility.h

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#pragma once
 
#include <array>
#include <tuple>
#include <type_traits>
#include <utility>
#include <vector>
 
#include "autopas/utils/ArrayMath.h"
#include "autopas/utils/ArrayUtils.h"
#include "autopas/utils/ExceptionHandler.h"
#include "autopas/utils/Math.h"
#include "autopas/utils/ThreeDimensionalMapping.h"
 
namespace autopas::LCC08CellHandlerUtility {
 
using OffsetPairSorting = std::tuple<unsigned long, unsigned long, std::array<double, 3>>;
 
using OffsetPair = std::pair<unsigned long, unsigned long>;
 
using OffsetPairVector = std::vector<OffsetPair>;
 
enum class C08OffsetMode {
  c08CellPairs = 0,
  c08CellPairsSorting = 1,
  c04CellPairs = 2,
};
 
template <C08OffsetMode Mode>
using OffsetPairType = std::vector<
    std::conditional_t<Mode == C08OffsetMode::c08CellPairsSorting, OffsetPairSorting,
                       std::conditional_t<Mode == C08OffsetMode::c04CellPairs, OffsetPairVector, OffsetPair>>>;
 
namespace internal {
 
enum class C08CellDirection : int {
  frontLeft,
  backLeft,
  frontRight,
  backRight,
};
 
constexpr inline std::array<C08CellDirection, 4> ALL_DIRECTIONS{
    {C08CellDirection::frontLeft, C08CellDirection::backLeft, C08CellDirection::frontRight,
     C08CellDirection::backRight}};
 
constexpr inline char ENUM_EXTENSION_EXCEPTION[]{
    "Enum C08CellDirection was extended, but its assciated switch-case statements was not!"};
 
constexpr std::pair<int, int> toMaskXY(const C08CellDirection &direction);
 
constexpr bool includeCellPair(const C08CellDirection &direction, const std::array<int, 3> &overlap, int x, int y,
                               int z);
 
std::array<double, 3> computeSortingDirection(const std::array<double, 3> &offset1Vector,
                                              const std::array<double, 3> &offset2Vector,
                                              const std::array<double, 3> &cellLength);
 
}  // namespace internal
 
template <C08OffsetMode Mode>
OffsetPairType<Mode> computePairwiseCellOffsetsC08(const std::array<unsigned long, 3> &cellsPerDimension,
                                                   const std::array<double, 3> &cellLength, double interactionLength);
 
}  // namespace autopas::LCC08CellHandlerUtility