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Date: Tue, 3 Apr 2018 11:18:10 -0700 (PDT)
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Subject: Re: limited agregate and limited components default initialization
From: Jean-Claude Rostaing <00120260a@gmail.com>
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Xref: reader02.eternal-september.org comp.lang.ada:51320
Date: 2018-04-03T11:18:10-07:00
List-Id: <comp.lang.ada>

Talking about limited aggregates, how to make the exemple below with protec=
ted types work ? It should be pretty much the same as what I already did, y=
et...
package P is
   type Essai (<>) is limited  private;
   function Constructor (v: Natural) return  ESSAI;
   procedure CHANGE (Obj: Essai; V: Natural);
private
   protected type ESSAI (D1: Natural) is=20
      procedure CHANGE (V: Natural);
   private
      Private_var: Natural :=3D D1;=20
   end Essai;
end P;

package BODY P is
   -- procedure change(Obj: Essai; V: natural) renames ESSAI.CHANGE;
   procedure CHANGE (Obj: ESSAI; V: NATURAL) is
   begin
      OBJ.CHANGE(V); -- 5
   end CHANGE;
   function CONSTRUCTOR ( V : NATURAL) return ESSAI is
     (Essai(D1 =3D> V)); -- 9

   protected body Essai is
      procedure CHANGE (V: natural) is
      begin
         PRIVATE_VAR :=3D V;
      end change;
   end Essai;
end P;

I get
p.adb:5:10: prefix of protected procedure or entry call must be variable
p.adb:9:14: invalid prefix in call

Actually, I wanted CHANGE to be a renaming of Change, but since Essai here =
behave more like a package, the protected operation doesn't its protected o=
bject as an argument, so the profile wouldn't be the same, so a renaming ca=
n only point to a specific task/protect object's entry.

I want to force people to use a constructor on any object of ESSAI type thr=
ough setting its discriminants. Discriminants who would serve to set the de=
fault value with the constructor, so they must be hidden from the user.

I must confess I never used anything protected types before... I thought th=
e use would be more intuitive ?