A where's-the-hole function.

[slidingtile] / sliding_tile_lib.h

diff --git a/sliding_tile_lib.h b/sliding_tile_lib.h
index 89c65c1ee51c7b3ecc2a0e6c561c2a2e6c78a9db..84d422e2faaf09d44c663a253c1cc02c94418cb1 100644 (file)
--- a/sliding_tile_lib.h
+++ b/sliding_tile_lib.h
@@ -9,6 +9,7 @@ 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);