----boundary-LibPST-iamunique-932530106_-_-
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Bernard:
I kow of Services. The AdrOf returns an INTEGER.
How do I cast into a pointer which Join and others
can use, without SYSTEM?
The entire point is that there is an asymmetry in the
language, not a shortage of low level SYSTEM services.
Wojtek Skulski skulski{([at]})nowhere.xy
On Thu, 3 Jul 2003, Treutwein Bernhard wrote:
> Hi Wojtek,
>
> lastly I have a quick answer:
>
> Check Module Services, there you find:
>
> PROCEDURE AdrOf (IN rec: ANYREC): INTEGER;
>
> and later:
>
> PROCEDURE AdrOf (IN rec: ANYREC): INTEGER
> Returns the address of a record variable.
>
> I think this serves your wishes ...
>
> --
> Bernhard Treutwein, IuK, Ref. III A 3
> Bernhard.Treutwein(at)verwaltung uni-muenchen de
>
> > -----Original Message-----
> > From: Wojtek Skulski [mailto:skulski{([at]})nowhere.xy> > Sent: Thursday, July 03, 2003 8:41 AM
> > To: BlackBox
> > Cc: gmeunier{([at]})nowhere.xy> > Subject: Something is missing in Component Pascal
> >
> >
> > Hello:
> >
> > I have been strugling with BlackBox during the last few days,
> > and I have come to the conclusion that something is missing in
> > Component Pascal. Really. Perhaps I am missing something in the
> > language manual, in which case I apologise.
> >
> > This something is well known in C as an address operator, which
> > we also need in a type-safe version. I searched the language report
> > for the word "address" and it is not there. I propose the following.
> >
> > Imagine there is a function which only takes pointers. Imagine
> > the name of the function is Join. (Now you can feel the blues,
> > do not you?) Imagine that for some reason I am working with
> > statically declared records. This has been possible for the last
> > 50 years, and it should still be possible with CP. So OK, let's
> > assume I have this fancy. So I declare the bunch of records,
> > and now I want to write these to a file. This also used to be
> > possible for the last 50 years. So I am writing to a file using
> > Stores.Writer and I am getting what? You bet. TRAP 21. Everybody
> > still with me?
> >
> > OK, so I start reading Stores documentation and I find the following
> > remedy which is supposed to help with TRAP 21.
> >
> > IF ~Stores.Joined(s1, s2) THEN
> > IF ~Stores.Unattached(s2) THEN
> > s2 := Stores.CopyOf(s2)
> > END;
> > Stores.Join(s1, s2)
> > END;
> >
> > Wonderful. So I start using it and I get what? You bet. Compilation
> > error. My stores are records, not pointers.
> >
> > So now I have a question. How do I call the function Join
> > which expects
> > a pointer, if I have a statically declared record, either
> > global variable
> > or a stack variable?
> >
> > In case this is trivial, I will really appreciate your telling me.
> > We have an experiment next week and I do need this software to work
> > without TRAP 21.
> >
> > In case there is no trivial solution, I will temporarily dump
> > BB and start
> > using C++ for the time being, where such stupid traps do not happen.
> > I would also propose the following syntax to be added to the language:
> >
> > (*declaration*)
> > VAR r1, r2: RECORD (Stores.Store) (*some data*) END;
> > s: Stores.Store;
> >
> > BEGIN
> > IF ~Stores.Joined(POINTER TO r1, POINTER TO r2) THEN
> > IF ~Stores.Unattached (POINTER TO r2) THEN
> > s := Stores.CopyOf (POINTER TO r2)
> > END;
> > Stores.Join(POINTER TO r1, s)
> > END;
> >
> > You feel the blues? The "POINTER TO r" is the opposite to
> > dereferencing,
> > that is the "address of" operator. It should be possible
> > anywhere where
> > the opposite could be used, that is
> >
> > VAR p: POINTER TO r;
> >
> > BEGIN NEW(p); (* now we can use p^ *)
> >
> > If I can use p^ to fill it with data, and p to pass to a function,
> > then it should be possible to use r to fill with data, and
> > "POINTER TO r"
> > to be passed to functions.
> >
> > In case you do not like my syntax, let it be ^r as the opposite to p^,
> > or &r if you like C style, or POINTER(r), or whatever. I do not care.
> > All that I want is to be able to use the framework, where functions
> > are defined with pointers, and they do not want to be called
> > with records.
> >
> > In case I am missing something obvious, I stand corrected and
> > I apologize.
> >
> > I wish everybody a good 4-th July.
> >
> > Wojtek Skulski skulski{([at]})nowhere.xy> >
> >
> > PS1: I hope the proposed solution will not be as follows, but
> > I will use
> > this if nothing else helps, because we have the
> > experiment next week.
> >
> > SYSTEM.VAL(ptrType, SYSTEM.ADR(record))
> >
> >
> > PS2: Gerard, I do not think you are there yet. The traps
> > happen when I am
> > dealing with histograms which are pointed to from the tree nodes.
> > Once I display such a histogram, it gets joined to some viev, and
> > thus its domain gets dirty. Now I cannot store these dirty histos
> > anymore. This problem is hidden deep in the dungeons of BlackBox.
> > You do not see it yet unless you have some pointers to stores
> > attached to your trees. The tree itself does not have
> > this problem.
> > The Dialog tree is not a store anyway. The collection of stores
> > develops the collective problem when some stores get
> > their domains
> > attached to something else than other stores. So it is all pretty
> > nonobvious.
> >
> >
> >
> > --------------------------------------------
> >
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>
>
>
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Received on Thu Jul 03 2003 - 16:55:27 UTC