-- -- Copyright (C) 1996 Ada Resource Association (ARA), Columbus, Ohio. -- Author: David A. Wheeler -- with Things, Directions; use Things, Directions; package Occupants is -- An "Occupant" is a Thing that can be inside a Room or another Occupant. type Occupant is abstract new Thing with private; type Occupant_Access is access all Occupant'Class; -- Dispatching subprograms: procedure Look(T : access Occupant); -- Ask Occupant T to "look". procedure Get(Agent : access Occupant; Direct_Object : access Occupant'Class); -- Ask Agent to get Direct_Object. This assumes that Agent can -- somehow access Direct_Object (i.e. is in the same room). -- If the agent decides that it can get the object, it will -- call May_I_Get to ask the object if that's okay. procedure Drop(Agent : access Occupant; Direct_Object : access Occupant'Class); -- Ask Agent to drop Direct_Object. procedure Inventory(Agent : access Occupant); -- Ask Agent to print a list of what Agent is carrying. procedure Go(Agent : access Occupant; Dir : in Direction); -- Ask Agent to go the given Direction Dir (North, South, etc.) procedure Put_View(T : access Occupant; Agent : access Thing'Class); -- Override Thing's Put_View. function May_I_Get(Direct_Object : access Occupant; Agent : access Occupant'Class) return Boolean; -- Ask Direct_Object if "Agent" can get this object. -- Returns True if it's okay, else False. -- If the object does something while being gotten (or an attempt -- to do so) it does it in this call. function May_I_Drop(Direct_Object : access Occupant; Agent : access Occupant'Class) return Boolean; -- Ask Direct_Object if "Agent" can drop this object; -- returns True if it's okay. private type Occupant is abstract new Thing with record null; -- Nothing here for now. end record; end Occupants; -- -- 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 body.
You may also see the list of program units.
The following compilation units refer to ("with") Package spec Occupants:
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