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Newsgroups: comp.lang.ada
Date: Fri, 29 Mar 2019 09:46:46 -0700 (PDT)
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Subject: Re: type definition for an integer with discrete range
From: mario.blunk.gplus@gmail.com
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Xref: reader01.eternal-september.org comp.lang.ada:55997
Date: 2019-03-29T09:46:46-07:00
List-Id: <comp.lang.ada>

On Friday, March 29, 2019 at 5:34:24 PM UTC+1, tranng...@gmail.com wrote:
> On Friday, March 29, 2019 at 11:10:42 PM UTC+7, mario.b...@gmail.com wrote:
> > Hello,
> > I'm looking for a way to define a type that runs from let say -100 to +100 with gaps of 5 width. Important is to make sure that a value like 7 can not be assigned to the type.
> > 
> > something like:
> > 
> > type number is new integer range -100 .. 100;
> > -- or
> > subtype number is integer range -100 .. 100;
> > 
> > -- with this special thing or something like that:
> > for number'small use 5; -- can not applied here. works with fixed point types only
> > 
> > Thanks !
> 
> That's a fixed point type.

It is about angles to be correct. The problem is that fixed types are rounded. I tried 

type type_angle is delta 90.0 range -359.9 .. 359.9; -- unit is degrees
for type_angle'small use 90.0;

-- but it is possible to assign a value that is not a multiple of 90 degree and even outside the domain of type_angle:
angle : type_angle := 370.0;

I want a constraint error being raised.