Re: Another Idea for Ada 20XX

[Stephen Leake <stephen.a.leake.1@gsfc.nasa.gov>]

"Nick Roberts" <nickroberts@adaos.worldonline.co.uk> writes:

> "Larry Kilgallen" <Kilgallen@SpamCop.net> wrote in message
> news:C1UHcLPG$dZX@eisner.encompasserve.org...
> 
> > > nor to allow 10 minutes * 5 KPH = 833 Meters
> >
> > Are you saying that multiplying two different types (not subtypes
> > of the same type) works in Ada95 ?  My experience is mostly Ada83.
> 
> If they are both fixed point types, I think the answer is 'yes', provided
> it's in the context of a specific fixed point type (not universal fixed).
> E.g.:
> 
>    D: Distance := Duration(10*60.0) * KPH(5.0);

Umm, surely there must somewhere be defined a "conversion multiplier",
and it must be visible:

function "*" (left : in duration; right : in KPH) return Distance;

otherwise the above statement is not legal, in Ada 83 or 95.

Defining _all_ of these required conversion multipliers is the killer
for this concept.

-- 
-- Stephe