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From: Stephen Leake <stephen.a.leake.1@gsfc.nasa.gov>
Newsgroups: comp.lang.ada
Subject: Re: Specialization
Date: 01 Jun 2002 11:25:04 -0400
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Simon Wright <simon@pushface.org> writes:

> dennison@telepath.com (Ted Dennison) writes:
> 
> > Why wouldn't that happen automaticly? If you want to *manually*
> > control finalization, you probably shouldn't be using controlled
> > types.
> 
> I _knew_ there was a problem in the Booch Containers around here
> ... if you use a bounded container it places the elements in an array,
> so if they need finalization it may well happen long after you were
> expecting it to. I guess I'd need to add something to the generic ..
> 
>    generic
>       type Item is private;
>       with function "=" (L, R : Item) return Boolean is <>;
>       Null_Value : Item;                                    --  new
>    package BC.Containers is
> 
> which means yet another non-defaultable generic parameter, 

Things should be as simple as possible, but no simpler. Put it in. 

You could actually give it a default, but the users would have to make
that object visible, and use your name for it; not much better than
simply supplying the parameter at instantiation.

> people are fed up enough with instantiating all these nested
> generics as it is. 

BCs are for experts. Tell them to suck it up :).

> I suppose this could be deferred to the forms that need it, clearly
> Unbounded doesn't:

Yes, localize the dependencies as much as possible.

-- 
-- Stephe