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Newsgroups: comp.lang.ada
Date: Mon, 16 Mar 2020 23:29:56 -0700 (PDT)
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Subject: Re: Good/best way to enforce library-level instantiation a generic
 package
From: briot.emmanuel@gmail.com
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Xref: reader01.eternal-september.org comp.lang.ada:58203
Date: 2020-03-16T23:29:56-07:00
List-Id: <comp.lang.ada>

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;