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[slidingtile] / sliding_tile_lib.h

diff --git a/sliding_tile_lib.h b/sliding_tile_lib.h
index 0bd3da32cade27ab812d2e3224e08f1476bd3b0b..c92676175647c664baf9d9b804ecdda54b72beb5 100644 (file)
--- a/sliding_tile_lib.h
+++ b/sliding_tile_lib.h
@@ -30,6 +30,7 @@ struct Step {
   std::vector<Step*> successors(std::shared_ptr<Step> shared_this);
   static signed char adjacent[BOARD_SIZE][5];
 };
+std::ostream& operator<<(std::ostream& os, const Step& step);
 
 
 #endif /* _SLIDING_TILE_LIB_H */