Re: [BLACKBOX] Variant Records vs. Component Pascal

From: [at]} <Bob>
Date: Fri, 1 Jan 2010 11:49:23 -0000

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Hi,
 
welcome, and happy new year.
 
If I've understood your problem correctly then the code below might be of
some use. It defines a binary tree which can contain different types of
shape - rectangle and circle, which are extensions of a Figure base type. It
creates 2 circles and a rectangle, adds them to the tree then prints the
tree in sequence.
 
Regards,
Bob
 
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________________________________

        From: BlackBox [mailto:BLACKBOX{([at]})nowhere.xy
Stephen R. Troy
        Sent: 31 December 2009 21:12
        To: BLACKBOX{([at]})nowhere.xy
        Subject: [BLACKBOX] Variant Records vs. Component Pascal
        
        
                Hello List,
        This is my first post to this list. To help you reply, I started
programming digital computers, in machine language, in 1957. Since then I
have done scientific and engineering programming in FORTRAN, BASIC, Pascal,
and then Modula-2 for many years. I have only limited familiarity with C.
Now retired, recently I have moved to Oberon and now Component Pascal,
writing programs to support hobbies.

        I have a program I have been evolving for several years, which reads
in a database which is in a structured ASCII text file using a third-party
database schema. The program develops several index files, performs various
sorting and filtering operations on these indexes, and the uses the modified
indexes to write out reports using the same database schema. There are
three main types of records, and I was able to write very efficient sorting
and filtering procedures in Modula-2 by writing the records as variant
records of a basic type, then instantiating the records by pointers. My
indexes were linked lists of the pointers, both linear and binary trees, and
so I could find, sort, and filter each of the three types of records using
the same very efficient code, because I manipulated only the pointers'
"next-record" pointer in the linked lists, not moving any records in memory.


        But I apparently I can't use this method in Component Pascal because
variant records are not allowed. I tried defining a basic record as an
ABSTRACT type, then defining each of my three record types as extensions.
However, I can't instantiate a record as a NEW(pointer to basic type), and I
can't use a single sort routine with each of the three (pointer to extension
type) -- I need three separate routines, which is clumsy at best, and seems
contrary to the basic intent of Component Pascal. I tried defining the
basic record type as EXTENSIBLE, but that made no difference. I found an
obscure section in the Component Pascal documentation that said that using a
RECORD [union] system flag, which allowed a "C-type" union data structure,
it was possible to simulate Pascal- and Modula-style variant records, but
the example in the documentation will not compile -- it gives an "invalid
system flag" error message on the [union] flag.

        Any suggestions would be welcome at this point.
        Thanks,
        Steve Troy
        
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Received on Fri Jan 01 2010 - 12:49:23 UTC