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From: sjw <simon.j.wright@mac.com>
Newsgroups: comp.lang.ada
Subject: Re: Unconstrained Arrays
Date: Sun, 29 Mar 2009 09:24:34 -0700 (PDT)
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Date: 2009-03-29T09:24:34-07:00
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On Mar 27, 9:39=A0am, Jean-Pierre Rosen <ro...@adalog.fr> wrote:
> sjw a =E9crit :
>
> > My current problem is with this ..
>
> > =A0 =A0type Stream_Type
> > =A0 =A0 =A0(Buffer : access Ada.Streams.Stream_Element_Array)
> > =A0 =A0is new Ada.Streams.Root_Stream_Type with private;
> > =A0 =A0-- =A0Provides an in-memory Stream over the elements of Buffer.
> > =A0 =A0--
>
> But why do you need to pass a Stream_Element_Array? Why not pass the
> size as a discriminant, and have the buffer internal to Stream_Type.
>
> If you really need to access the buffer from the outside, you could have
> a Get_Buffer function on Stream_Type that returns (your choice) the
> buffer content, or a pointer to the internal buffer.

To be useful, the pointer to the internal buffer would have to be an
'access Ada.Streams.Stream_Element_Array'. How could I create one of
these from a constrained object?

I think this idea of mine is a non-starter; I'll stick with the
current BC.Support.Memory_Streams. No point providing a library
component that no one can actually use!