distances.h

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#ifndef DISTANCES_H
#define DISTANCES_H
 
#include <unordered_map>
#include <vector>
#include <algorithm>
#include <memory>
 
namespace mazes {
 
class cell;
 
class distances : public std::enable_shared_from_this<distances> {
public:
    explicit distances(std::shared_ptr<cell> root);
 
    int& operator[](const std::shared_ptr<cell>& cell) noexcept {
        return m_cells[cell];
    }
 
    const int& operator[](const std::shared_ptr<cell>& cell) const noexcept {
        return m_cells.at(cell);
    }
 
    void set(std::shared_ptr<cell> cell, int distance) noexcept;
 
    bool contains(const std::shared_ptr<cell>& cell) const noexcept;
 
    std::shared_ptr<distances> path_to(std::shared_ptr<cell> goal) const noexcept;
 
    std::pair<std::shared_ptr<cell>, int> max() const noexcept;
 
    void collect_keys(std::vector<std::shared_ptr<cell>>& cells) const noexcept;
 
    std::shared_ptr<distances> dist() const noexcept;
private:
    std::shared_ptr<cell> m_root;
    std::unordered_map<std::shared_ptr<cell>, int> m_cells;
};
 
} // namespace mazes
#endif // DISTANCES_H