--
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