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From: "Randy Brukardt" <randy@rrsoftware.com>
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Subject: Re: A simple ADA puzzle (I haven't the answer)
Date: Thu, 24 Jun 2004 16:00:05 -0500
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"Frank J. Lhota" <NOSPAM.lhota.adarose@verizon.net> wrote in message
news:riCCc.2700$A9.1045@nwrdny01.gnilink.net...
...
> So if I understand the concept correctly, the way a compiler could handle
> this type declaration would be to always allocate objects of this type off
> of a heap, so that sizes could be adjusted as needed. In othr words, when
> you declare
>
>     My_String : STRING_TYPE;
>
> then My_String could actually hold a pointer to an object on the heap,
with
> the current LEN discriminant. If My_String were assigned a value with a
> different value of LEN, the pointer in My_String would be changed if
> necessary to point to a heap object of the appropriate size. Is this the
> Janus Ada approach?

Essentially, although the allocation only done for components that depend on
discriminants and can change size (that is, arrays). Records are always
allocated fixed size (only the array components can change size, and they're
allocated separately). That works better when you have multiple array
components.

                       Randy.