1 files changed, 12 insertions, 0 deletions

@@ -3,6 +3,9 @@
 
 #include <string_view>
 #include <stdexcept>
+#include <tuple>
+
+using coord = std::tuple<int, int>;
 
 enum class Direction {
   up,
@@ -19,4 +22,13 @@ inline Direction directionFromString(std::string_view str) {
   throw std::invalid_argument("Invalid direction: " + std::string(str));
 }
 
+inline coord coordInDirection(int x, int y, Direction dir) {
+  switch (dir) {
+    case Direction::up: return {x, y-1};
+    case Direction::down: return {x, y+1};
+    case Direction::left: return {x-1, y};
+    case Direction::right: return {x+1, y};
+  }
+}
+
 #endif /* end of include guard: DIRECTION_H_42BDAFB9 */