Hallo Ivanko,
Du schriebst am Mon, 11 Nov 2013 14:34:40 +0500:
> For non-2^N ranging.
For this yone could consider to allow subrange types as basde types for bit
fields also - so you get "the better" of both things:
- you can specify the needed / wanted number of bits _and_
- you can specify the numeric range the bitfield should denote
(as long as you allowed for sufficiently many bits)
My previous egregious example
Register = RECORD
Field_1: 0..77;
Field_2: 1..3;
Field_3: 5..25;
Field_4: 111..112;
Field_5: -2..-1;
END;
might thus be specified like this:
TYPE
Basevalue = 0..77;
Selector = 1..3;
FiveStep = 5, 10, 15, 20, 25; { or just 5..25; }
{ maybe allow for incompletely populated subranges as well? }
HighEnd = 111..112;
LowEnd = -2..-1;
Register = RECORD
Field_1: Basevalue: 7;
Field_2: Selector: 2;
Field_3: FiveStep: 5;
Field_4: HighEnd: 1;
Field_5: LowEnd: 1;
END;
Surely not the simplest of things to implement for a compiler, but very
clearly stating the intentions of the programmer. Now, if the values are
checked for range also (at least at compile time, a sfar as possible), the
language might become one of the safest to use that exist, without
sacrificing versatility.
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