Change Point2 to use STL arrays for predefined directions

include/aoc/Point2.hpp

@@ -15,6 +15,8 @@
 
 #pragma once
 
+#include <array>
+
 class Point2
 {
 public:
@@ -24,11 +26,11 @@ class Point2
     /// The eight cardinal and diagonal directions starting down, rotating in
     /// positive direction.
     /// </summary>
-    static const Point2 directions[8];
+    static const std::array<Point2, 8> directions;
     /// <summary>
     /// The four cardinal directions starting down, rotating in positive direction.
     /// </summary>
-    static const Point2 cardinalDirections[4];
+    static const std::array<Point2, 4> cardinalDirections;
     int x, y;
     Point2();
     Point2(const int x, const int y);