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From: Sven Jauring
Subject: [Fwd: 16 bit sets?]
Date: 3 Aug 2001, 08:18:31

Hi again!

I need to be able to specify not only 16 bit sizes but also 8 bit and 4
bit sizes as well.
Is there anyone out there that could give me a hint of HOW to implement
the functionality in GPC and some kind of estimation of how long TIME it
would take?

Best Regards
Sven Jauring

-------- Original Message --------
Subject: 16 bit sets?
Date: Tue, 31 Jul 2001 16:34:50 +0200
From: Sven Jauring <sven.jauring@hiq.se>
To: gpc@gnu.de

Hi,


I'm working in a project, where I need to compile old pascal code using
GPC (beta 20010201).

The code is scattered with variable types, that depends on bit
correlations in unions.
E.g:
********************************
type
  INT0_255 = packed 0..255;

  BITS = (BIT0,BIT1,BIT2,BIT3,
          BIT4,BIT5,BIT6,BIT7,
          BIT8,BIT9,BIT10,BIT11,
          BIT12,BIT13,BIT14,BIT15);

var
  VARIABLE1 : record case int16 of
                0: (WORD: INTEGER);
                1: (MSB: INT0_255;
                    LSB: INT0_255);
                2: (BT : set of BITS);
              end;

*********************************
In order for this declaration to function properly, I seem to need the
possibility to specify 'BT' to be just 16 bits, and not 32 bits, which
seems to be default.

I tried to find out from the manual if this is possible. I found the
following passages:
"The Extended Pascal features still missing from GPC are ..., set types
with variable bounds, ..."
and "Planned features: Other types... *sparse sets; sets of arbitrary
types ?? ???"

For me, this is pretty deep water, so I won't take offence if you tell
me to RTFM, but never the less...
My question is this: Can it be done in the latest release (20010623) or
should I wait for someone to implement this feature?

Best Regards
Sven Jauring

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