1 /* $Id$ */

     2 

     3 #ifndef ROAD_H

     4 #define ROAD_H

     5 

     6 typedef enum RoadBits {

     7 	ROAD_NW  = 1U,

     8 	ROAD_SW  = 2U,

     9 	ROAD_SE  = 4U,

    10 	ROAD_NE  = 8U,

    11 	ROAD_X   = ROAD_SW | ROAD_NE,

    12 	ROAD_Y   = ROAD_NW | ROAD_SE,

    13 	ROAD_ALL = ROAD_X  | ROAD_Y

    14 } RoadBits;

    15 

    16 static inline RoadBits ComplementRoadBits(RoadBits r)

    17 {

    18 	return (RoadBits)(ROAD_ALL ^ r);

    19 }

    20 

    21 static inline RoadBits DiagDirToRoadBits(DiagDirection d)

    22 {

    23 	return (RoadBits)(1U << (3 ^ d));

    24 }

    25 

    26 #endif /* ROAD_H */