Input validation

[slidingtile] / sliding_tile_lib.h

diff --git a/sliding_tile_lib.h b/sliding_tile_lib.h
index 1ffe6fa24c3deaf33f1a4f475ff9eff0e8e26ca3..89c65c1ee51c7b3ecc2a0e6c561c2a2e6c78a9db 100644 (file)
--- a/sliding_tile_lib.h
+++ b/sliding_tile_lib.h
@@ -8,6 +8,7 @@ const int BOARD_SIZE = BOARD_DIM * BOARD_DIM;
 
 struct Board {
   signed char board[BOARD_SIZE];
+  bool is_valid();
 };
 std::istream& operator>>(std::istream& is, Board& board);