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From: Shark8 <onewingedshark@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: _Type vs no _Type
Date: Sat, 6 Nov 2010 14:20:19 -0700 (PDT)
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Date: 2010-11-06T14:20:19-07:00
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On Nov 6, 7:24=A0am, Robert A Duff <bobd...@shell01.TheWorld.com> wrote:
> Shark8 <onewingedsh...@gmail.com> writes:
> > On Nov 5, 4:52 pm, Robert A Duff <bobd...@shell01.TheWorld.com> wrote:
> >> Named notation never, ever, ever makes sense for operators.
> >> And if the body of "+" is short, single-letter
> >> names are crystal clear.
>
> > Well, except in the case where you need to specify an operator that
> > might not be immediately visible.
>
> IMHO, you should never, ever, ever be in that situation.

True enough.
But sometimes you have constraints such as "must be Ada83 compilable"
or somesuch.

> Writing Foo."+"(Left =3D> ..., Right =3D> ...) or
> Foo."+"(..., ...) completely defeats the purpose.

Agreed.

> You should instead say "use" or "use type".

Being relatively new to Ada, I didn't know about "use type" when I ran
into the problem and used dot-qualification instead of the [otherwise-
needed] "use".

> Or if you really want the package name, then
> you shouldn't have made it an operator symbol
> in the first place.

I don't think it was in a package I'd wrote, I don't remember the
details; just that the solution pkg."+"( Left =3D> XXX, Right YYY )
looked odd, but did what it needed.

> If I were in charge, operators would always be directly
> visible. =A0It's really silly that ":=3D" is always visible,
> but "=3D" is not. =A0

There've been a few cases where I would have liked a 'Type attribute
for variables/parameters; with such you could duplicate the GNAT-
specific Var'Img via Var'Type'Image. But maybe that's getting a little
too picky.