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From: Bill Findlay <yaldnif.w@blueyonder.co.uk>
Newsgroups: comp.lang.c++,comp.lang.ada
Subject: Re: Why use C++?
Date: Fri, 12 Aug 2011 18:02:33 +0100
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Date: 2011-08-12T18:02:33+01:00
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On 12/08/2011 16:50, in article
e9987381-4f7b-4d25-9c9b-429fd4da74f6@k15g2000yqd.googlegroups.com, "Stuart
Redmann" <DerTopper@web.de> wrote:

> Stuart Redmann wrote:
> [snip]
>>> Be honest, how often do you really _want_ a wrapping int?
> 
> On 12 Aug. Vinzent Hoefler wrote:
>> Thinking indices instead of pointers, quite often, actually.
> 
> Could you please provide some example? Seriously, I'm really
> interested in the usage of wrapping types since in the last ten years
> I have not felt the need for wrapping ints at all (well, maybe two or
> three times).

In my current project, the following are all defined in one unit:

   type nest_depth is mod 19;
   type sjns_depth is mod 17;

   type word is mod 2**48;
   type field_of_16_bits is mod 2**16;
   type syllable is mod 2**8;
   type halfword is mod 2**24;
   type symbol is mod 2**6;
   type symbol_number is mod 8;

   type microseconds is mod 2**64;
   type priority is mod 2**2;
   type one_bit is mod 2;
   type context is mod 2**2;
   type INS_kind is mod 2**2;
   type order_counter is mod 2**64;

For most of these, the wrapping behaviour is exactly what is needed
to model computer hardware (they are from a KDF9 emulator).

nest_depth and sjns_depth, in particular, are the index types of cyclic
buffers.

-- 
Bill Findlay
with blueyonder.co.uk;
use  surname & forename;