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+#ifndef DIRECTION_H_AB66A90E
+#define DIRECTION_H_AB66A90E
+
+#include <string>
+#include <stdexcept>
+
+enum class Direction {
+  up,
+  up_right,
+  right,
+  down_right,
+  down,
+  down_left,
+  left,
+  up_left
+};
+
+inline Direction directionFromString(std::string_view str) {
+  if (str == "up") return Direction::up;
+  if (str == "up_right") return Direction::up_right;
+  if (str == "right") return Direction::right;
+  if (str == "down_right") return Direction::down_right;
+  if (str == "down") return Direction::down;
+  if (str == "down_left") return Direction::down_left;
+  if (str == "left") return Direction::left;
+  if (str == "up_left") return Direction::up_left;
+  throw std::invalid_argument("Invalid direction: " + std::string(str));
+}
+
+#endif /* end of include guard: DIRECTION_H_AB66A90E */