block_key.hpp

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#pragma once
 
#include <array>
#include <compare>
#include <cstddef>
 
namespace uni20
{
 
template <std::size_t CoordinateCount> class BlockKey {
  public:
    constexpr BlockKey() = default;
 
    constexpr explicit BlockKey(std::array<std::size_t, CoordinateCount> coordinates) : coordinates_(coordinates) {}
 
    static constexpr auto size() noexcept -> std::size_t { return CoordinateCount; }
 
    constexpr auto coordinate(std::size_t axis) const -> std::size_t { return coordinates_[axis]; }
 
    auto operator<=>(BlockKey const&) const = default;
 
  private:
    std::array<std::size_t, CoordinateCount> coordinates_{};
};
 
} // namespace uni20