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Date: Tue, 17 Mar 2020 03:15:14 -0700 (PDT)
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Subject: Re: Good/best way to enforce library-level instantiation a generic
 package
From: Vincent Marciante <vincent.marciante@l3harris.com>
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Xref: reader01.eternal-september.org comp.lang.ada:58205
Date: 2020-03-17T03:15:14-07:00
List-Id: <comp.lang.ada>

On Tuesday, March 17, 2020 at 2:29:58 AM UTC-4, briot....@gmail.com wrote:
> On Monday, March 16, 2020 at 7:51:29 PM UTC+1, Vincent Marciante wrote:
> > I made a generic package that I want only to be instantiated at library level.
> > I'm working on compile-time a way to enforce that desire which involves access 
> > type accessibility level checking but have not yet set it up correctly.
> > Is there a better/standard way?
> 
> The way I do this is using gnat-specific pragmas and attributes:
> 
> generic
> package Generics is
>    pragma Compile_Time_Error
>      (not Generics'Library_Level, "must be at library level");
>    ...
> end Generics;

'Library_Level is nice and clean!  It should be part of the Standard!
I am using GNAT but still have to be compatible with other compiler so
will have to go with something along the lines of Randy's suggestion.
Thanks.