X-Git-Url: http://git.scottworley.com/slidingtile/blobdiff_plain/19bd29f9b2a3e4721943496debfc55e2a7d71da5..b18667f24728cb960b0c60fa55824062582278bf:/sliding_tile_lib.h

diff --git a/sliding_tile_lib.h b/sliding_tile_lib.h
index 1ffe6fa..89c65c1 100644
--- 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);