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From: Dale Stanbrough <dstanbro@bigpond.net.au>
Newsgroups: comp.lang.ada
Subject: Re: Saturated Math
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Date: Fri, 30 May 2003 10:54:50 GMT
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AG wrote:

> "Dale Stanbrough" <dstanbro@bigpond.net.au> wrote in message
> news:dstanbro-D4C3C0.18423630052003@mec2.bigpond.net.au...
> > I've just tried writing such a package (generic) and it doesn't seem
> > that it would be altogether seemless for the end user.
> >

> > procedure main is
> >    type Number is new Integer range 1..5;
> >
> >    package Saturated_Int is new Saturate (Number);
> >    use Saturated_Int;
> >
> >    x : Number := 4;
> > begin
> >    x := Saturated_Int."+" (x, 2);
> >    x := Saturated_Int."-" (x, 6);
> > end;
> >
> >
> > The function "+" in the following
> >
> >    x := x + 2;
> >
> > is said to be ambiguous with Standard."+" (according
> > to gnat).
> 
> In this case, the problem seems to be that the compiler
> (quite rightly) can't tell which "+" you mean since there
> are, in fact, two implementations visible at that spot.

yes, i agree. But i think that's the problem of user defined
saturation maths packages. (unless someone can come up with a
different solution).

It seems that the client has to use the package.operator notation
if you want to implement saturated maths this way. Is there any
way around this?

Dale