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Newsgroups: comp.lang.ada
Date: Thu, 15 Apr 2021 02:47:45 -0700 (PDT)
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Subject: Re: ? How get/use a 'type' from a Ada shared library loaded at run
 time (plugin) ?
From: Daniel Norte Moraes <danielcheagle@gmail.com>
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Xref: reader02.eternal-september.org comp.lang.ada:61792
List-Id: <comp.lang.ada>

Em quinta-feira, 15 de abril de 2021 =C3=A0s 06:28:29 UTC-3, Dmitry A. Kaza=
kov escreveu:
> On 2021-04-15 10:48, Daniel Norte Moraes wrote:=20
>=20
> > How use Ada 'type(s)' from an library loaded at run time (dlopen &Cia)?=
 are they possible?
> Like any other type.=20
>=20
> You should not forget to initialize the library though. The library=20
> project should normally have=20
>=20
> for Library_Auto_Init use "false";=20
>=20
> because otherwise it would likely deadlock under Windows [if you wish to=
=20
> make your project portable]. Under Linux I am not sure if it deadlocks,=
=20
> never tested for that.
> > My main need is to declare variables from these types or and make=20
> > dispatching calls based in these types.
> You cannot declare variables of types declared in a dynamically loaded=20
> library for the obvious reason that you cannot dynamically refer to a=20
> package from the library.=20
>=20
> But you can dispatch on a class-wide object which specific type is=20
> declared in a dynamically loaded library.=20
>=20
> For example you can call a dynamically loaded constructing function that=
=20
> returns T'Class where T is declared outside the library and then=20
> dispatch to an overridden primitive operation of S derived from T inside=
=20
> the library.=20
>=20
> To my understanding library initialization expands dispatching tables=20
> with all tagged types declared in the library.=20
>=20
> P.S. What happens on finalization is an intriguing question. I would=20
> rather never attempt to unload an Ada library...=20
>=20
> --=20
> Regards,=20
> Dmitry A. Kazakov=20
> http://www.dmitry-kazakov.de

Thanks!

Best Whishes,
Dani.