--
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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----boundary-LibPST-iamunique-1614340453_-_---
Received on Thu Jul 03 2003 - 09:02:24 UTC
This archive was generated by hypermail 2.3.0 : Thu Sep 26 2013 - 06:29:09 UTC