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From: mark_lundquist@my-deja.com
Newsgroups: comp.lang.ada
Subject: Re: bitstreams
Date: Tue, 16 Jan 2001 17:36:32 GMT
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References: <93se2v$nen$1@eol.dd.chalmers.se> <93vik8$u08$1@nnrp1.deja.com>
 <9406cs$g4i$1@nnrp1.deja.com>
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Date: 2001-01-16T17:36:32+00:00
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In article <9406cs$g4i$1@nnrp1.deja.com>,
  Robert Dewar <robert_dewar@my-deja.com> wrote:
> In article <93vik8$u08$1@nnrp1.deja.com>,
>   mark_lundquist@my-deja.com wrote:
> > Note that shift and rotate functions are primitive operations
> > of the Signed_<n> and Unsigned_<n> families of types (RM B.2)
>          ^^^^^^^^^^
>
> A surprising mistake :-)

You got that right... it sure suprised me!

Sloppy, sloppy.  Yesterday was NOT a good news-posting day for me...

:-) :-)

> It is of course the case that these
> functions do NOT apply to signed numbers (where there meaning
> would be obscure or at least implementation defined, because
> of the sign bit issue).
>
> One interesting bit of non-portability comes from whether it
> is possible to define these operators for *USER* defined
> unsigned types. The RM does not require this capability, but
> in GNAT you can define your own intrinsic shift functions for
> your own modular types, and GNAT will permit this. I do not
> know if other Ada 95 compilers provide this capability.

That is interesting...

-- mark


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