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Newsgroups: comp.lang.ada
Date: Tue, 5 Jan 2021 06:31:26 -0800 (PST)
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Subject: Re: Lower bounds of Strings
From: Stephen Davies <joviangm@gmail.com>
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On Tuesday, 5 January 2021 at 12:24:52 UTC, Luke A. Guest wrote:
> On 05/01/2021 11:04, Stephen Davies wrote: 
> > 
> > I'm referring to the fact that any subprogram with a String 
> > parameter, e.g. Expiration_Date, has to use something like 
> > Expiration_Date (Expiration_Date'First .. Expiration_Date'First + 1) 
> > to refer to the first two characters rather than simply saying 
> > Expiration_Date (1..2).
> What if the length changes? By using a constant, say it was 'Last being 
> used, if that last changes, the program won't crash. 
> 
That was simply an example, though it does highlight that you currently
cannnot have global constants "Month_First : constant Positive := 1" and
"Month_Last : constant Positive := 2".

On Tuesday, 5 January 2021 at 11:57:18 UTC, Dmitry A. Kazakov wrote:
>
> Position-based indices an slices. One could add [] brackets for that 
> stuff to make C crowd happy. 
> 
> S [1] - First array element 
> S (1) - Array element at index 1 
> 
> Same with slices. Differently to #1, this is would not require excessive 
> string copying. 
Yes, I like that idea as a possible alternative solution.