anim3D/src/RealPropProxy.i3

 Copyright (C) 1994, Digital Equipment Corporation                         
 Digital Internal Use Only                                                 
 All rights reserved.                                                      
                                                                           
 Last modified on Thu Jul 21 09:10:06 PDT 1994 by najork                   
       Created on Sun May 22 00:08:25 PDT 1994 by najork                   




INTERFACE RealPropProxy;

IMPORT Prop, ProxiedObj;

FROM RealProp IMPORT Name, Val, ConstBeh, SyncBeh, AsyncBeh, DepBeh, Request;

 Proxy Maker (PM) procedures for the various proxied object types are
   registered by assigning them to these variables. These variables could be
   put in their own interface. 


VAR
  NamePM     : PROCEDURE (x : Name)     := NIL;
  ValPM      : PROCEDURE (x : Val)      := NIL;
  ConstBehPM : PROCEDURE (x : ConstBeh) := NIL;
  SyncBehPM  : PROCEDURE (x : SyncBeh)  := NIL;
  AsyncBehPM : PROCEDURE (x : AsyncBeh) := NIL;
  DepBehPM   : PROCEDURE (x : DepBeh)   := NIL;
  RequestPM  : PROCEDURE (x : Request)  := NIL;

 The AsyncBeh and DepBeh types are abstract supertypes; concrete
   asynchronous and dependent behaviors are created by overriding the value
   method. We want to be able to do this not only from Modula-3, but also from
   the embedded language (e.g. Obliq). This is achieved by providing special
   proxy types.


   The proxy field of AsyncBeh and DepBeh must contain either NIL or
   an object of type AsyncBehProxy or DepBehProxy.



TYPE
  AsyncBehProxy = ProxiedObj.Proxy OBJECT
  METHODS
    compute (time : LONGREAL) : REAL RAISES {Prop.BadMethod};
  END;

  DepBehProxy = ProxiedObj.Proxy OBJECT
  METHODS
    compute (time : LONGREAL) : REAL RAISES {Prop.BadMethod};
  END;

  RequestProxy = ProxiedObj.Proxy OBJECT
  METHODS
    value (startval : REAL; reltime : REAL) : REAL
        RAISES {Prop.BadMethod};
  END;

END RealPropProxy.