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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: syntaxic exploration
Date: Thu, 21 Dec 2017 01:21:51 -0600
Organization: JSA Research & Innovation
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Date: 2017-12-21T01:21:51-06:00
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"Mehdi Saada" <00120260a@gmail.com> wrote in message 
news:0fa75dd5-599b-4a38-a5d4-3151bbe5172f@googlegroups.com...
> Hum, how do I write a array component with one element ? Something like 
> (_discriminant_, (0)) (array starting from 0) doesn't work. It shows:
> p_poly_v1_g.adb:40:63: positional aggregate cannot have one component
> p_poly_v1_g.adb:40:63: write instead "T_Vect_Coef'First => ..."
>
> But Array_type'First..Array_type'Last doesn't seem fine when there's just 
> one element...
> Or better, none. How do I write that for an empty array ??

Ada has no good way to write an empty array. I usually use (1 .. 0 => <>) 
for that, but nothing is really satisfying.

For a single element, write a single choice (a choice doesn't have to be a 
range!) The compiler error message gives a suggestion.

                                               Randy.