A where's-the-hole function.

[slidingtile] / sliding_tile_lib.h

diff --git a/sliding_tile_lib.h b/sliding_tile_lib.h
index 1ffe6fa24c3deaf33f1a4f475ff9eff0e8e26ca3..84d422e2faaf09d44c663a253c1cc02c94418cb1 100644 (file)
--- a/sliding_tile_lib.h
+++ b/sliding_tile_lib.h
@@ -8,6 +8,8 @@ const int BOARD_SIZE = BOARD_DIM * BOARD_DIM;
 
 struct Board {
   signed char board[BOARD_SIZE];
+  bool is_valid();
+  signed char hole();
 };
 std::istream& operator>>(std::istream& is, Board& board);