with Ada.Strings.Unbounded;
use  Ada.Strings.Unbounded;

package Directions is

 type Direction is (North, South, East, West, Up, Down);

 Reverse_Direction : constant array(Direction) of Direction :=
                    (North => South, South => North,
                     East =>West, West => East,
                     Up => Down, Down => Up);

 function To_Direction(Text : Unbounded_String) return Direction;
 -- Converts Text to Direction; raises Constraint_Error if it's not
 -- a legal direction.

 function Is_Direction(Text : Unbounded_String) return Boolean;
 -- Returns TRUE if Text is a direction, else false.

end Directions;

You may also see the corresponding body. The following compilation units refer to ("with") Package spec Directions:

• Package spec Occupants
• Package spec Things
• Package spec Rooms
• Package body Parser
• Package body World

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