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Date: Tue, 5 Apr 2016 01:57:43 -0700 (PDT)
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Subject: Re: Ada 2005,Doubly_Linked_List with Controlled parameter
From: George J <ivanov_george@list.ru>
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Xref: news.eternal-september.org comp.lang.ada:29988
Date: 2016-04-05T01:57:43-07:00
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=D0=B2=D1=82=D0=BE=D1=80=D0=BD=D0=B8=D0=BA, 5 =D0=B0=D0=BF=D1=80=D0=B5=D0=
=BB=D1=8F 2016 =D0=B3., 11:50:31 UTC+3 =D0=BF=D0=BE=D0=BB=D1=8C=D0=B7=D0=BE=
=D0=B2=D0=B0=D1=82=D0=B5=D0=BB=D1=8C Dmitry A. Kazakov =D0=BD=D0=B0=D0=BF=
=D0=B8=D1=81=D0=B0=D0=BB:
> On 05/04/2016 10:35, George J wrote:
> > ....
> >> Or, better, since you never change Name or Surname:
> >>
> >>      type Info_Record
> >>         (Name_Length : Positive; Surname_Length : Positive) is
> >>      record
> >>         Name    : String (1..Name_Length);
> >>         Surname : String (1..Surname_Length);
> >>         Age     : Natural;
> >>      end Info_Record;
> >>
> >> --
> >> Regards,
> >> Dmitry A. Kazakov
> >> http://www.dmitry-kazakov.de
> >
> > I do it this way, and I have to change Doubly_Linked_List(Info_Record) =
to
> > Indefinite_DoublY_Linked(Info_Record) cause of error:"unconstrained
> > subtype in component declaration". Am I right?
>=20
> I am not familiar with the design of standard container's doubly-linked=
=20
> lists. Normally, a list always deals with limited indefinite elements.=20
> Otherwise, it does not make much sense.
>=20
> > Or may be it's any way to
> > use Doubly_Linked_List? And,BTW, I'm afraid of using Indefinite List
> > cause I think,that it can request much more memory, than
> > Doubly_C_L,isn't it?
>=20
> As I said, I don't know how it is designed. There are many ways to=20
> design a list. One is that elements are derived from linked base=20
> elements. Another is that links are allocated outside and point to the=20
> elements. A better variant of the latter is to use a custom storage pool=
=20
> and put links before the elements. In all three methods there is no=20
> overhead of having elements limited indefinite.
>=20
> --=20
> Regards,
> Dmitry A. Kazakov
> http://www.dmitry-kazakov.de

It seems I've got.Thanks!