tiny update

[mc1516pa.git] / modelchecker / coord.h

diff --git a/modelchecker/coord.h b/modelchecker/coord.h
index 2ec2918..599b91b 100644 (file)
--- a/modelchecker/coord.h
+++ b/modelchecker/coord.h
@@ -3,6 +3,8 @@
 
 #include "sokoban.h"
 
+typedef enum { LEFT, UP, RIGHT, DOWN } direction;
+
 BDD encode_screen(sokoban_screen *screen);
 
 BDD encode_rel(sokoban_screen *screen);