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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Ada 2005,Doubly_Linked_List with Controlled parameter
Date: Tue, 5 Apr 2016 10:50:03 +0200
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Date: 2016-04-05T10:50:03+02:00
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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?

I am not familiar with the design of standard container's doubly-linked 
lists. Normally, a list always deals with limited indefinite elements. 
Otherwise, it does not make much sense.

> 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?

As I said, I don't know how it is designed. There are many ways to 
design a list. One is that elements are derived from linked base 
elements. Another is that links are allocated outside and point to the 
elements. A better variant of the latter is to use a custom storage pool 
and put links before the elements. In all three methods there is no 
overhead of having elements limited indefinite.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de