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From: "Jeffrey R. Carter" <spam.jrcarter.not@spam.not.acm.org>
Newsgroups: comp.lang.ada
Subject: Re: limited agregate and limited components default initialization
Date: Tue, 3 Apr 2018 21:18:54 +0200
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Date: 2018-04-03T21:18:54+02:00
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On 04/03/2018 08:18 PM, Jean-Claude Rostaing wrote:
> 
> p.adb:5:10: prefix of protected procedure or entry call must be variable

Obj should be mode "in out".

> p.adb:9:14: invalid prefix in call

I can't say I've ever tried to have a function return a protected type. I think 
you'll need to do

begin
    return R : Essai (D1 => V);
end Essai;

But I think it would be better in this case to expose the discriminant:

type Essai (D1 : Natural) is limited private;

Then clients have to provide the value they would pass to Constructor as the 
discriminant:

E : Essai (D1 => V);

which does what you want and is simpler.

-- 
Jeff Carter
"[A] brilliant military career that after thirty
years catapulted him to the rank of corporal."
Take the Money and Run
138