cell.h

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#ifndef CELL_H
#define CELL_H
 
#include <cstdint>
#include <memory>
#include <shared_mutex>
#include <unordered_map>
#include <vector>
 
#include <MazeBuilder/hash_funcs.h>
 
namespace mazes
{
    class cell final
    {
    public:
        explicit cell(std::int32_t index = 0);
 
        ~cell();
 
        cell(const cell& other);
 
        cell& operator=(const cell& other);
 
        cell(cell&& other) noexcept;
 
        cell& operator=(cell&& other) noexcept;
 
        void add_link(const std::shared_ptr<cell>& other);
 
        void remove_link(const std::shared_ptr<cell>& other);
 
        std::vector<std::pair<std::shared_ptr<cell>, bool>> get_links() const;
 
        bool is_linked(const std::shared_ptr<cell>& c);
 
        int32_t get_index() const noexcept;
 
        void set_index(std::int32_t next_index) noexcept;
 
        void cleanup_links();
 
    private:
        struct weak_ptr_equal
        {
            template <typename T>
            bool operator()(const std::weak_ptr<T>& lhs, const std::weak_ptr<T>& rhs) const
            {
                return !lhs.owner_before(rhs) && !rhs.owner_before(lhs);
            }
        };
 
        bool has_key(const std::shared_ptr<cell>& c);
 
        std::unordered_map<std::weak_ptr<cell>, bool, weak_ptr_hash, weak_ptr_equal> m_links;
 
        mutable std::shared_mutex m_links_mutex;
 
        std::int32_t m_index;
    };
} // namespace mazes
 
#endif // CELL_H