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From: Julian Leyh <julian@vgai.de>
Newsgroups: comp.lang.ada
Subject: Re: Garbage Collection ???
Date: Wed, 18 Apr 2012 02:07:05 -0700 (PDT)
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Date: 2012-04-18T02:07:05-07:00
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Am Samstag, 14. April 2012 20:21:17 UTC+2 schrieb Robert A Duff:
> In Ada 2012, you can say:
> 
>     type T_Ptr_Opt is access all T;
>     subtype T_Ptr is T_Ptr_Opt with
>         Dynamic_Predicate => T_Ptr /= null;

In Ada 2005, you can already say:

    type T_Ptr_Opt is access all T;
    subtype T_Ptr is not null T_Ptr_Opt;