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Newsgroups: comp.lang.ada
Date: Sun, 1 Apr 2018 05:58:31 -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:51276
Date: 2018-04-01T05:58:31-07:00
List-Id: <comp.lang.ada>

=C2=A0 =C2=A0 generic=20
=C2=A0 =C2=A0 =C2=A0 =C2=A0 type Item_Type(<>);=20
=C2=A0 =C2=A0 package Pointers is=20
=C2=A0 =C2=A0 =C2=A0 =C2=A0 type Smart_Pointers is limited null record;=20
=C2=A0 =C2=A0 end Pointers;=20

It would be logical, but it is impractical, because of
(Value: in Item_type) return Smart_Pointers is
     (Smart_Pointers'(Controlled with Node =3D> new Accessor_type'(Data =3D=
> new Item_type'(Value), Count =3D> 1)));
=C2=AB=C2=A0initialization not allowed for a limited type=C2=A0=C2=BB becom=
es=C2=A0:
pointers2.adb:18:18: invalid use of formal incomplete type
pointers2.adb:19:87: premature usage of incomplete type "Item_type" defined=
 at pointers2.ads:4

To Jacob=C2=A0:=20
=C2=A0 =C2=A0type Item_Type (<>) is private;=20
=C2=A0 =C2=A0type Item_Record (<>) is private;
Sure=C2=A0! It=E2=80=99s already done for Item_type (see the generic parame=
ter ;-) ) and Item_Record is declared in the private part, so =C2=AB=C2=A0u=
nknown discriminant is not allowed=C2=A0=C2=BB. Such a shame, it would be u=
seful to tell the compiler that you=E2=80=99re not declare initialized stuf=
f even in the body, even though you know the discriminants.