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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: library level required or not?
Date: 01 Mar 2004 20:17:20 +0000
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Marius Amado Alves <maa@liacc.up.pt> writes:

> On Monday 01 March 2004 18:41, Preben Randhol wrote:
> > On 2004-03-01, Marius Amado Alves <maa@liacc.up.pt> wrote:
> > > Ok, I found Ada Issue 115, which clarifies that "a language-defined
> > > generic package may be instantiated at any nesting depth."
> > >
> > > I'm still in the dark regarding unbounded strings though, as
> > > Ada.Strings.Unbounded is not generic.
> >
> > What do you mean?
> 
> If you look at the GNAT sources for example, you'll find that
> Unbounded_String is controlled. And yet you can declare an unbounded
> string inside a 'main' program. Try pulling that out with your own
> controlled type.

?

There is a difference between instantiating the generic, which amounts
to defining a new type derived from Controlled, and declaring an
instance of a type .. is this 3.9.1(3)?

(I also see (4), "A type extension shall not be declared in a generic
body if the parent type is declared outside that body." I think ISNBAL
-- I shall never be a lawyer)

-- 
Simon Wright                               100% Ada, no bugs.