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Date: Thu, 25 May 2017 15:57:41 -0700 (PDT)
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Subject: Re: Preventing private procedure visibility being made public through
 extension
From: Jere <jhb.chat@gmail.com>
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Xref: news.eternal-september.org comp.lang.ada:46867
Date: 2017-05-25T15:57:41-07:00
List-Id: <comp.lang.ada>

On Thursday, May 25, 2017 at 6:53:10 PM UTC-4, Jere wrote:
> On Thursday, May 25, 2017 at 3:40:01 PM UTC-4, Randy Brukardt wrote:
> > Your probably having trouble with the appropriaate view of My_Type. The full 
> > type of My_Type has both versions of Create (of course), as it inherits from 
> > View_Type. If you try to extend somewhere where that full view is visible, 
> > then that extension too will get both Creates. (That includes in the body 
> > and in any child packages.)
> > 
> > OTOH, an extension somewhere that only has visibility on the private type, 
> > you should only get one (visible) Create. (But the other one is still 
> > inherited, it just can't be called directly.)
> > 
> > I could go into more detail if you need that; it would help to have a full 
> > compilable example in that case so I can see where everything is declared.
> > 
> >                            Randy.
> > 
> > 
> 
> This might be a better example.  I have 3 tiers:  Base/Derived/More_Derived
> 
> More_Derived publicly inherits off of Base but privately inherits off of
> Derived. 
> 
> Derived provides a Something procedure and More_Derived provides a Something
> procedure but uses a different signature and is not overriding (I double
> checked by putting "overriding" with it and noted the compiler error).
> 
> More_Derived does not have private view of Derived, but GNAT still says
> there is a ambiguity.  I don't see how More_Derived has a private
> view of Derived, so I think this is a bug, but I might be missing
> something.
> 
>  [snipped]
> 
> If I don't use the subtype in main.adb, it compiles fine.

Forgot to mention it is GNAT GPL 2016.  I don't have FSF working on my 
Win10 machine yet to check.