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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: null exclusion and generics
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Date: Thu, 19 Oct 2006 15:06:35 +0200
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Date: 2006-10-19T15:06:35+02:00
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On Thu, 19 Oct 2006 14:51:59 +0200, Georg Bauhaus wrote:

> If a generic formal type is private, I can supply a
> null excluding subtype for the type parameter.
> A generic formal private type means assignment is possible.
> Declarations of objects of the null excluding
> actual inside the generic need explicit initialization,
> though.
> 
> generic
>    type T is private;
> procedure Nop(source: in T);

Is it really so? I would expect them to require:

   generic
      type T (<>) is private;
   procedure Nop(source: in T);

for "not null" is a constraint.

What would a language layer say?

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