Package body Rooms

-- Copyright (C) 1996 Ada Resource Association (ARA), Columbus, Ohio.
-- Author: David A. Wheeler

with Text_IO, Ustrings;
use  Text_IO, Ustrings;

package body Rooms is

 procedure Connect(Source : access Room; Dir : in Direction; 
                   Destination : access Thing'Class;
                   Bidirectional : in Boolean := True) is
   Source.Destinations(Dir) := Thing_Access(Destination);
   if Bidirectional then  -- Connect in reverse direction.
     Room_Access(Destination).Destinations(Reverse_Direction(Dir)) := 
   end if;
 end Connect;

 procedure Disconnect(Source : access Room; Dir : in Direction; 
                      Bidirectional : in Boolean := True) is
   if Bidirectional then
     -- If it's bidirectional, remove the other direction. The following "if"
     -- statement, if uncommented, checks to make sure that
     -- disconnecting a bidirectional link only happens to a Room.
     -- if (Source.Destinations(Dir).all'Tag in Room'Class) then
                   Destinations(Reverse_Direction(Dir)) := null;
     -- end if;
   end if;
   Source.Destinations(Dir) := null;
 end Disconnect;

 function What_Is(From : access Room; Dir : in Direction) return Thing_Access is
  return From.Destinations(Dir);
 end What_Is;

 procedure Put_View(T : access Room; Agent : access Thing'Class) is
  Put("You are ");
  Put_Contents(T, Agent, "You see:");
 end Put_View;

end Rooms;

-- Permission to use, copy, modify, and distribute this software and its
-- documentation for any purpose and without fee is hereby granted,
-- provided that the above copyright and authorship notice appear in all
-- copies and that both that copyright notice and this permission notice
-- appear in supporting documentation.
-- The ARA makes no representations about the suitability of this software
-- for any purpose.  It is provided "as is" without express
-- or implied warranty.

You may also see the corresponding specification.

You may also see the list of program units.

The following compilation units are referred to ("with"'ed) by Package body Rooms:

You may return to the Program Small Home Page.

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