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Newsgroups: comp.lang.ada
Date: Thu, 12 Dec 2019 02:17:24 -0800 (PST)
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Subject: Re: Is this actually possible?
From: Lucretia <laguest9000@googlemail.com>
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Xref: reader01.eternal-september.org comp.lang.ada:57715
Date: 2019-12-12T02:17:24-08:00
List-Id: <comp.lang.ada>

On Wednesday, 11 December 2019 21:34:15 UTC, Dmitry A. Kazakov  wrote:
> On 2019-12-11 22:12, Lucretia wrote:
> > On Wednesday, 11 December 2019 19:58:54 UTC, Dmitry A. Kazakov  wrote:
> 
> >> If you need objects that could be packed into C arrays use a variant
> >> record with the choice discriminant having a default.
> > 
> > But in my cases, a variant cannot be used.
> 
> Why? You must know all variants in order to compute the array element 
> size. In Ada you cannot have it either:

Because it's a binding to a C record: https://github.com/Lucretia/aplug/blob/master/ladspa/src/ladspa.ads#L113