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From: Martin <martin.dowie@btopenworld.com>
Newsgroups: comp.lang.ada
Subject: Re: Reading the while standard input into a String
Date: Fri, 10 Jun 2011 01:22:31 -0700 (PDT)
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Date: 2011-06-10T01:22:31-07:00
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On Jun 9, 1:46=A0am, "Randy Brukardt" <ra...@rrsoftware.com> wrote:
> "Niklas Holsti" <niklas.hol...@tidorum.invalid> wrote in message
>
> news:959s61F40sU1@mid.individual.net...
> ...
>
> > The compiler can ignore pragma Pack in the sense that the compiler can
> > allocate memory for the data type in the same was as if there were no
> > pragma Pack. That is, the pragma does not have to result in a smaller
> > memory lay-out. The pragma only asks the compiler to *try* to minimize =
the
> > size, but the compiler does not have to try very hard... or at all.
>
> > If you want to be sure that pragma Pack has some (desired) effect, you
> > should define the 'Size attribute of the type. If the compiler cannot p=
ack
> > the type into the given size, it must report a compile-time error.
>
> In this particular case, where a specific representation of an array is
> desired, you have to specify 'Component_Size on the array type. Pack does=
n't
> necessarily specify a particular representation, and even when it does, i=
t
> is much better to explicitly state that you want 16 bit components (rathe=
r
> than just "smaller" components).
>
> In the original example, the type should have been declared:
>
> =A0 =A0 type Buffer is array (1..32) of Interfaces.Unsigned_16
> =A0 =A0 =A0 =A0 with Component_Size =3D> 16;
>
> presuming you have an Ada 2012 compiler. If not, fall back on those ugly
> attribute definition clauses:
>
> =A0 =A0 type Buffer is array (1..32) of Interfaces.Unsigned_16;
> =A0 =A0 for Buffer'Component_Size use 16;
>
> (Ugly because you have to repeat the type name and because they can get
> separated from the type.)
>
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0Randy.

Randy / Bob,

Thanks for these answers...looking forward to Ada2012 even more
now! :-)

-- Martin