- Hiding abstract methods

From: Treutwein Bernhard <"Treutwein>
Date: Fri, 15 Jun 2007 09:10:18 +0200

----boundary-LibPST-iamunique-131795604_-_-
Content-type: text/plain

Hi Bob & Doug,

what about a hierarchy of modules like the abstraction
layers given in BlackBox:

Abstractions in almost purely abstract modules (like e.g.
the Files module of BlackBox), which reveal only the
very necessary details and provide mechanisms for
factories (directories in BB terminology). Concrete
implementations (like HostFiles) import these, initialize
the factories and have (more or less) private interfaces.

Although now the details are still visible (in principle
via the low level interfaces) you have a least a separation
of the published stuff.

regards
--
	Bernhard Treutwein, IuK, Ref. III A 3
	Bernhard.Treutwein(at)verwaltung uni-muenchen de
> -----Original Message-----
> From: blackbox{([at]})nowhere.xy> Behalf Of Bob Walkden
> Sent: Friday, June 15, 2007 8:28 AM
> To: BlackBox Mailing List
> Subject: [BlackBox] - Hiding abstract methods
> 
> 
> You can't simultaneously hide the methods of A and have A as 
> an abstract type extensible from other modules - it's a 
> contradiction. An abstract type can't be instantiated, it 
> must be inherited and its inheritors must instantiate its 
> parts. If the parts are hidden then it's impossible for its 
> inheritors (in other modules) to instantiate them.
>  
> --
> Regards,
>  Bob 
>  
> 
> 
>   _____  
> 
> 	From: blackbox{([at]})nowhere.xy> Behalf Of Douglas G. Danforth
> 	Sent: 15 June 2007 03:35
> 	To: BlackBox Mailing List
> 	Subject: [BlackBox] - Hiding abstract methods
> 	
> 	
> 	Bob,
> 	I am trying to keep the amount of stuff shown to a minimum.
> 	
> 	There is also a procedure Run that is exported from M 
> that when called starts up and eventually calls the installed 
> reader and writer (repeatedly).
> 	The reader and writer do not invoke the hidden 
> procedures they are passive and are called by M when needed.
> 	
> 	How do I hide the methods of A, Bits, and Ints?
> 	
> 	-Doug Danforth
> 	
> 	
> 	
> 	
> 	Bob Walkden wrote: 
> 
> 		How and when are M's internal procedures 
> invoked? If the client's reader is to invoke them directly 
> then they must be made public. If you want M's hidden 
> procedures to be invoked indirectly by the reader or writer 
> you may need to provide a couple of Notifier procedures in M 
> and have the reader or writer call them explicitly.
> 		 
> 		--
> 		Regards,
> 		 Bob 
> 		 
> 
> 
>   _____  
> 
> 			From: blackbox{([at]})nowhere.xy> [mailto:blackbox{([at]})nowhere.xy> 			Sent: 14 June 2007 22:25
> 			To: BlackBox Mailing List
> 			Subject: [BlackBox] - Hiding abstract methods
> 			
> 			
> 			Chris,
> 			
> 			Here is what I would like the interface 
> to module M to appear
> 			
> 			DEFINITION M;
> 			
> 			    TYPE
> 			        A = POINTER TO ABSTRACT RECORD  END;
> 			
> 			        Bits = POINTER TO RECORD (A)
> 			            x: POINTER TO ARRAY OF SET
> 			        END;
> 			
> 			        Ints = POINTER TO RECORD (A)
> 			            x: POINTER TO ARRAY OF INTEGER
> 			        END;
> 			
> 			        Reader = PROCEDURE (VAR a: A): BOOLEAN;
> 			
> 			        Writer = PROCEDURE (a: A);
> 			
> 			    PROCEDURE InstallReader (rd: Reader);
> 			    PROCEDURE InstallWriter (wr: Writer);
> 			
> 			END M.
> 			
> 			One just installs a specific reader 
> that generates a Bits or an Ints.
> 			Internally to M there are many 
> procedures that take the abstract
> 			quantity 'a' when a read operation is 
> done and operate on it with procedures
> 			that are methods of type either Bits or 
> Ints whose definitions are given internally
> 			and are abstractions of the of type A.  
> But the user of M need not know anything
> 			about this and BlackBox should not 
> force the user to see these methods.
> 			
> 			How can this be accomplished?
> 			
> 			-Doug Danforth
> 			
> 			
> 			CFB Software wrote: 
> 
> 				Hi Doug,
> 				
> 				I don't know if I can help but 
> as nobody else has responded yet I'm
> 				willing to give it a try. I'm 
> interested in learning more about the
> 				finer details of issues like 
> this. However, I'm not sure from your
> 				desription that I understand 
> exactly what you are trying to do. Would it
> 				be possible for you to show 
> complete minimal examples of: 
> 				
> 				a) What you would like the code 
> to look like 
> 				
> 				b) How you think it needs to be 
> written to make it acceptable to
> 				Blackbox
> 				
> 				Regards,
> 				Chris Burrows
> 				CFB Software
> 				http://www.cfbsoftware.com/gpcp
> 				
> 				  
> 
> 					-----Original Message-----
> 					From: 
> blackbox{([at]})nowhere.xy> 					Behalf Of Douglas G. Danforth
> 					Sent: Wednesday, 13 
> June 2007 10:22 AM
> 					To: BlackBox Mailing List
> 					Subject: [BlackBox] - 
> Hiding abstract methods
> 					
> 					
> 					Folks,
> 					
> 					I have a conceptual 
> problem on which I would like your advice.
> 					
> 					I have an ABSTRACT type 
> A and two concrete types C1 and
> 					C2 which are extensions of A.
> 					
> 					    TYPE
> 					       A* = POINTER TO 
> ABSTRACT RECORD END;
> 					       C1* = POINTER TO 
> RECORD(A) END;
> 					       C2* = POINTER TO 
> RECORD(A) END;
> 					
> 					I would like to export 
> A (as shown with the '*'') but within the
> 					module M where A is 
> defined I *do not want* to export its
> 					methods.  I want them 
> to be completely hidden so that the user
> 					of M only needs to 
> create the instance Ci (and fill its 
> 					fields (not shown))
> 					and pass Ci to the 
> module M in which the specific methods 
> 					appropriate to Ci
> 					are specified (but also 
> not exported).  Within M, procedures take 'a'
> 					(an instance of A which 
> is either C1 or C2) and operates on it without
> 					knowledge of its 
> concrete form.  The methods of A are simply called
> 					and the concrete forms 
> of those methods as C1 or C2 are actually
> 					run.
> 					
> 					Unfortunately, it seems 
> that this scheme of things is not possible in 
> 					BlackBox.
> 					I am forced to export 
> the methods of A and also the methods of C1 and
> 					the methods of C2, 
> greatly cluttering the interface to M when 
> 					none of that
> 					information will be 
> used by the person operating with M.  
> 					Only the existence
> 					of A and the extensions 
> C1 and C2 are needed.
> 					
> 					Is there a clean way to 
> hide all of these methods?
> 					
> 					-Doug Danforth
> 					
> 					--- BlackBox
> 					--- send subject HELP 
> or UNSUBSCRIBE to blackbox{([at]})nowhere.xy> 					    
> 
> 				
> 				--- BlackBox
> 				--- send subject HELP or 
> UNSUBSCRIBE to blackbox{([at]})nowhere.xy> 				
> 				
> 				  
> 
> 
--- BlackBox
--- send subject HELP or UNSUBSCRIBE to blackbox{([at]})nowhere.xy----boundary-LibPST-iamunique-131795604_-_-
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----boundary-LibPST-iamunique-131795604_-_---
Received on Fri Jun 15 2007 - 09:10:18 UTC

This archive was generated by hypermail 2.3.0 : Thu Sep 26 2013 - 06:31:32 UTC