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#ifndef NODE_HPP
#define NODE_HPP
#include <ostream>
class AStar;
class Node {
friend AStar;
public:
Node();
// overloading operators for ease of use.
friend bool operator<(const Node& n1, const Node& n2);
friend bool operator==(const Node& n1, const Node& n2);
friend bool operator>(const Node & n1, const Node & n2);
friend bool operator<=(const Node& n1, const Node& n2);
friend bool operator>=(const Node& n1, const Node& n2);
friend bool operator!=(const Node& n1, const Node& n2);
friend std::ostream& operator<<(std::ostream& out, const Node& n);
private:
// pointer to previous node so that I can backtrack without using recursion.
int x_prev, y_prev;
// pointers to the next nodes of which there are 4 in a grid.
// We do not need this as we are implementing a priority queue;
//Node *next_nodes[NEIGHBOUR_NUM];
// score that is used to compare to other nodes to see if the other path is
// more efficient.
int f_score;
// path length to get to that node.
int g_score;
// heuristic length to destination.
int h_score;
// the x and y coordinates of the node in the grid
int x, y;
// see if node has been visited.
// We don't need this as we will have an open and a closed set
//bool visited;
};
#endif // NODE_HPP
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