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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Using a generic instance to implement a public subprogram?
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Date: Sun, 3 Feb 2008 21:37:21 +0100
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Date: 2008-02-03T21:37:23+01:00
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On Sun, 03 Feb 2008 14:46:23 -0500, Peter C. Chapin wrote:

> Gautier wrote:
> 
>> No idea whether GNAT is right or not, but the following works
[...]
> Cool. I'll give that a try.

Providing an implementation through renaming is 100% legal.
 
> So it seems like the instantiation is regarded as a different thing than 
> the subprogram mentioned in the specification.

Yes

"A generic_instantiation declares an instance; it is equivalent to the
instance declaration (a package_declaration or subprogram_declaration)
immediately followed by the instance body, both at the place of the
instantiation." (RM 12.3)

Because an instantiation is both a declaration and the implementation of,
it cannot serve as an implementation of anything else.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de