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Newsgroups: comp.lang.ada
Date: Wed, 23 Jul 2014 09:48:01 -0700 (PDT)
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Subject: Re: Parent/child dependencies and internal library units
From: Adam Beneschan <adambeneschan@gmail.com>
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Xref: news.eternal-september.org comp.lang.ada:21160
Date: 2014-07-23T09:48:01-07:00
List-Id: <comp.lang.ada>

On Wednesday, July 23, 2014 9:20:27 AM UTC-7, Victor Porton wrote:
> I noticed that child units depend on their parents.=20
>=20
> As such making parent dependent on a child makes a dependency loop.
>=20
> Before noting this feature of Ada language, I thought parent units could =
be=20
> implemented based on their child units, but that does not work, because=
=20
> making parents dependent on children is a circular dependency.

When you talk about parent units being "implemented" based on their child u=
nits, are you talking about the *body* of a parent unit (which is where "im=
plementation" normally lives)?  There's no problem with making the body of =
a parent unit depend on a child unit.  A child unit depends on its parent's=
 *specification* but not on its body, so having the body of the parent depe=
nd on the child does not create a loop.

It might help to give a short example of what you want to write (even if it=
's not legal Ada because of a circular dependency).  As it is, I'm not clea=
r on what you're trying to do.

                                -- Adam