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Newsgroups: comp.lang.ada
Date: Thu, 2 May 2013 16:05:35 -0700 (PDT)
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Subject: Re: Ada202X : alternate syntax for ranged scalars
From: Jerry <lanceboyle@qwest.net>
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Date: 2013-05-02T16:05:35-07:00
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On Friday, April 26, 2013 3:10:01 AM UTC-7, Martin wrote:
> The default scalar declarations are 'closed ranges', i.e. include both upper and lower in the valid range.
> Sometimes we would like to specify a 'half open range', e.g. values of degree from 0.0 up to BUT NOT INCLUDING 360.0.
> I'm floating (pun intended) an alternative syntax for specify such ranges (or 'intervals')...
> type Degree is digits 15 range [0.0, 360.0); -- includes 0 but not 360
> 
> The current 'closed ranges' would be:
> type Degree is digits 15 range [0.0, 360.0]; -- includes 0 and 360
> 
> Fully open range, i.e. not include 0.0 or 360.0:
> type Degree is digits 15 range (0.0, 360.0); -- includes neither 0 nor 360
> 
> A 'reverse' half open range, i.e. not include 0.0 but including 360.0:
> type Degree is digits 15 range (0.0, 360.0]; -- excludes 0 but includes 360
> 
> Usual rules would apply to the simple expression between the brackets.
> 
> Any thoughts?
> -- Martin

If Ada introduces [ and ] please let them be for array indices.
Jerry