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Newsgroups: comp.lang.ada
Date: Thu, 12 Dec 2019 07:14:31 -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:57717
Date: 2019-12-12T07:14:31-08:00
List-Id: <comp.lang.ada>

On Thursday, 12 December 2019 14:32:21 UTC, Dmitry A. Kazakov  wrote:
> On 2019-12-12 11:17, Lucretia wrote:
> > 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
> 
> I cannot recognize problem there.

That's a predefined struct, it's referenced in the Descriptors below it. It cannot be changed. The API is too cyclic AFAIK to make generics out of it all.