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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Imitation is the sincerest form of flattery
Date: Sat, 22 Mar 2003 10:05:05 +0100
Organization: At home
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Date: 2003-03-22T10:05:05+01:00
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Pascal Obry wrote:

> Dmitry A. Kazakov <mailbox@dmitry-kazakov.de> writes:
> 
>> A private implementation of an array type. If the language have had
>> full ADT there would be no need predefined Unbounded_String. Or
>> consider the following:
>> 
>> type Sparse_Matrix is
>>    private array (Integer range <>; Integer <>) of Element;
>> 
>> It has an array interface, but internally it is also a record type
>> using a list to keep the array elements.
> 
> But how do you access element into this array, what would be done
> for:
> 
>    M : Sparse_Matix (1 .. 7, 1 .. 90);
> 
>    M (2, 6) := ...;

I have to prove an implementation for Set_Element, I suppose. When I declare 
that Sparse_Matrix an array, I have to override all the abstract methods of 
the universal array type might have. Set_Element is one of them.

--
Regards,
Dmitry A. Kazakov
www.dmitry-kazakov.de