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Newsgroups: comp.lang.ada
Date: Mon, 18 Dec 2017 17:08:37 -0800 (PST)
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Subject: Re: Full view of a private partial view cannot be a subtype
From: Jere <jhb.chat@gmail.com>
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Xref: reader02.eternal-september.org comp.lang.ada:49530
Date: 2017-12-18T17:08:37-08:00
List-Id: <comp.lang.ada>

On Monday, December 18, 2017 at 3:45:31 PM UTC-5, Stephen Leake wrote:
> On Saturday, December 2, 2017 at 8:14:50 PM UTC-6, Jere wrote:
> > There are times where in another package I want to
> > subtype Base.Instance and do renames of the operations in order
> > to bring them all into scope (or whatever the correct term is):
> > 
> >    package New_Type1 is
> >       subtype Instance is Base.Instance;
> >       procedure Operation(Object : in out Instance);
> >       
> >    private
> >       
> >       procedure Operation(Object : in out Instance) renames Base.Operation;
> >    end New_Type1;
> 
> Why subtype? why not a derived type? why do you need a new name with the same operations?

It's not a new name...it's actually the same name in a different package.  I
am basically trying to mimic a much more complex package with a simpler one.
They would have the same typenames and operations.  I didn't really want to
create a new type, just provide a simpler interface to an existing one while
hiding one particularly dangerous detail if I could.