From: mheaney@ni.net (Matthew Heaney)
Subject: Re: Packed array size question....
Date: 1997/03/16
Date: 1997-03-16T00:00:00+00:00 [thread overview]
Message-ID: <mheaney-ya023680001603971621360001@news.ni.net> (raw)
In-Reply-To: 01bc300c$247f6200$0e096dce@my-pc.neosoft.com
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In article <01bc300c$247f6200$0e096dce@my-pc.neosoft.com>, "Pat Rogers"
<progers@acm.org> wrote:
>> You have to admit that the attribute
>>
>> X'Size_In_Storage_Elements
>>
>> would make a lot of sense. In practice, knowing the number of storage
>> elements occupied by an object is much more useful than knowing the
>number
>> of bits.
>>
>> Surprisingly, this attribute was not included in Ada 95!
>
>From the RM:
>
>145 S�Max_Size_In_Storage_Elements
> For every subtype S:
>
>146 Denotes the maximum value for Size_In_Storage_Elements that will be
>requested via Allocate for an
> access type whose designated subtype is S. The value of this
attribute is
>of type universal_integer.
> See 13.11.1.
>
>Close enough?
No, because that attribute only applies to memory allocated via an allocator.
I wanted an attribute I could apply to stack objects:
declare
O : T;
begin
write (addr => O'Address, nbytes => O'Size_In_Storage_Elements);
end;
instead of
declare
O : T;
begin
write (addr => O'Address, nbytes => O'Size / 8);
end;
(Of course, T is a first-named subtype whose size is an integral multiple
of System.Storage_Unit. And in this case, System.Storage_Unit = 8.)
Matt
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Matthew Heaney
Software Development Consultant
<mailto:matthew_heaney@acm.org>
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next prev parent reply other threads:[~1997-03-16 0:00 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
1997-03-07 0:00 Packed array size question Marc Bejerano
1997-03-07 0:00 ` Robert Dewar
1997-03-13 0:00 ` Matthew Heaney
[not found] ` <01bc300c$247f6200$0e096dce@my-pc.neosoft.com>
1997-03-15 0:00 ` Robert Dewar
1997-03-16 0:00 ` Matthew Heaney [this message]
1997-03-16 0:00 ` Robert Dewar
1997-03-19 0:00 ` Dale Stanbrough
1997-03-21 0:00 ` Robert Dewar
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