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Date: Sat, 27 Jan 2018 03:38:41 -0800 (PST)
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Subject: Re: Iterable container as generic parameter
From: Lionel Draghi <lionel.draghi@gmail.com>
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Xref: reader02.eternal-september.org comp.lang.ada:50179
Date: 2018-01-27T03:38:41-08:00
List-Id: <comp.lang.ada>

Le samedi 27 janvier 2018 08:03:49 UTC+1, Randy Brukardt a =C3=A9crit=C2=A0=
:
> ...
> >By the way, I have another question. There is no way to provide a defaul=
t
> > instantiation to a formal package parameter?
>=20
> Not in Ada 2012 or before. There is an open issue (it is one of those tha=
t=20
> Emmanuel referenced in his message) to allow that. It hasn't progressed a=
ny=20
> significant amount at this time.

Very interesting indeed, to have lawyers and implementers view on a languag=
e change proposal.

>From my user point of view, the "or use" proposal looks very good.
It's simple (to write!), easy to read (much more in my opinion than "with D=
efault_Type =3D> ..." syntax).

I would just add that, when reading the comment on the ":=3D" proposal, tha=
t ":=3D" may seems to imply copying a type, I realized that I was already r=
eading :
> procedure New_Line (Spacing : Positive_Count :=3D 1);
as "give your own spacing, _or use_ 1 if none given", and not as=20
"_copy_ 1 in Spacing if none given".=20

So, IMHO, I wouldn't give a high weight to this argument.
=20
And, actually,=20
> procedure New_Line (Spacing : Positive_Count or use 1);
looks good too :-)
=20

=20

> (Aside: There are a LOT of ideas submitted for Ada 2020. Many good ideas =
are=20
> likely to be left out simply because of lack of time and/or too much=20
> change.)