----boundary-LibPST-iamunique-1885060255_-_-
Content-type: text/plain
Harro,
what do you think about the following solution?
Cheers
Marc
Oberon microsystems, Inc.
MODULE PrivA;
IMPORT StdLog;
TYPE A* = POINTER TO ABSTRACT RECORD END;
PROCEDURE (a: A) Init2-, NEW, ABSTRACT;
PROCEDURE (a: A) Init*, NEW;
BEGIN
StdLog.String("A.Init"); StdLog.Ln;
a.Init2
END Init;
END PrivA.
MODULE PrivB;
IMPORT StdLog, PrivA;
TYPE B* = POINTER TO RECORD (PrivA.A) END;
PROCEDURE (b: B) Init2-;
BEGIN
StdLog.String("B.Init2"); StdLog.Ln
END Init2;
END PrivB.
MODULE PrivC;
IMPORT PrivB;
PROCEDURE Do*;
VAR b: PrivB.B;
BEGIN
NEW(b); b.Init
END Do;
END PrivC.
> -----Original Message-----
> From: H. v. L. [mailto:hvl{([at]})nowhere.xy
> Sent: Sonntag, 3. Oktober 2004 12:57
> To: Fyodor Tkachov
> Cc: BlackBox mailing list
> Subject: Re: eliminate EXTENSIBLE types?
>
>
> On Sat, 02 Oct 2004 12:46:34 +0400, Fyodor Tkachov
> <fyodor.tkachov{([at]})nowhere.xy>
> > I would like to discuss the following simplification of our
> language:
> > would it not be good to banish EXTENSIBLE types altogether?
> Especially
> > that supercalls are to be eliminated.
>
> EXTENSIBLE types or supercalls?
>
> If I understand the proposal right it's concern is not about
> the type
> attribute EXTENSIBLE but about EXTENSIBLE methods and supercalls.
>
> With respect to EXTENSIBLE types (like TYPE E = POINTER TO
> EXTENSIBLE
> RECORD ... END) I think it's a matter of choice. If a
> programmer wants to
> use this kind of class declaration, why not, it's up to him.
>
> Another question is EXTENSIBLE methods which always are
> delicate matter
> because they enable supercalls. But to me this possibility is
> exactly the
> reason for their existence. Imagine the following scenario
>
> TYPE
> A* = POINTER TO ABSTRACT RECORD
> <attributes>
> PROCEDURE (a: A) Init, NEW, EXTENSIBLE;
> <other methods>
> END;
>
> B* = POINTER TO ABSTRACT RECORD (A)
> <more attributes>
> PROCEDURE (b: B) Init, EXTENSIBLE;
> <more methods>
> END;
>
> C = POINTER TO LIMITED RECORD (B)
> <more attributes>
> PROCEDURE (c: C) Init;
> <more methods>
> END;
>
> Let each of these types be contained in a separate module.
> Evidently only
> Type C may be instantiated. Nevertheless each of the base
> types has and
> needs it's own Init method
>
> PROCEDURE (a: A) Init, NEW, EXTENSIBLE;
> BEGIN
> ...
> END;
>
> PROCEDURE (b: B) Init, EXTENSIBLE;
> BEGIN
> Init^;
> ...
> END;
>
> and
>
> PROCEDURE (c: C) Init;
> BEGIN
> Init^;
> ...
> END;
>
> This scenario depends on supercalls, initialization can be
> and is done in
> a clear cut fashion, the Init methods of the base types can't
> be called
> directly.
>
> If you eliminate EXTENSIBLE methods from the language the
> same situation
> looks like this
>
> TYPE
> A* = POINTER TO ABSTRACT RECORD
> <attributes>
> PROCEDURE (a: A) InitA, NEW;
> <more methods>
> END;
>
> B* = POINTER TO ABSTRACT RECORD (A)
> <more attributes>
> PROCEDURE (b: B) InitB; NEW;
> <more methods>
> END;
>
> C = POINTER TO LIMITED RECORD (B)
> <more attributes>
> PROCEDURE (c: C) InitC; NEW;
> <more methods>
> END;
>
> So what does InitC has to do? In one possible scenario the abstract
> classes define their Init methods like above but InitB does
> not call InitA
>
> PROCEDURE (a: A) InitC, NEW;
> BEGIN
> ...
> END;
>
> PROCEDURE (b: B) InitC, NEW;
> BEGIN
> ...
> END;
>
> and InitC has to do all the initializations, probably in a
> specific order
>
> PROCEDURE (c: C) InitC, NEW;
> BEGIN
> InitA;
> InitB;
> ...
> END;
>
> The other scenario looks like this
>
> PROCEDURE (a: A) InitC, NEW;
> BEGIN
> ...
> END;
>
> PROCEDURE (b: B) InitC, NEW;
> BEGIN
> InitA;
> ...
> END;
>
> PROCEDURE (c: C) InitC, NEW;
> BEGIN
> InitB;
> ...
> END;
>
> In this case InitC has to call InitB only because InitA is
> called by InitB
> already.
>
> Now imagine the author of InitC does not know about the
> details, that is
> about initializations, and his version of InitC is
>
> PROCEDURE (c: C) InitC, NEW;
> BEGIN
> InitA;
> InitB;
> ...
> END;
>
> The least harmful situation might be that the second call of
> InitA does
> not change anything, it's only superfluous. But can you be
> shure of this?
> There may be situations where the second call destroys some
> initialization
> having been done by InitB and then ... up, up and away!
> Of course a behaviour like this ought to be documented, but
> you can't be
> certain everybody will always know the documentation or have
> it available
> and again the ambiguity is there.
> So my conclusion is, we need EXTENSIBLE methods and
> supercalls. Or is
> there another way of doing the job I do not see?
>
> Harro von Lavergne
>
> www.lahini.de
> --------------------------------------------
>
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Current posting policy:
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----boundary-LibPST-iamunique-1885060255_-_-
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Received on Mon Oct 04 2004 - 08:55:37 UTC