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From: Maciej Sobczak <see.my.homepage@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: Ada requires too much typing!
Date: Wed, 9 Jun 2010 14:22:53 -0700 (PDT)
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Date: 2010-06-09T14:22:53-07:00
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On 9 Cze, 16:29, "Dmitry A. Kazakov" <mail...@dmitry-kazakov.de>
wrote:

> > What is the common base class/interface for C++ or Ada containers?
>
> generic
> =A0 =A0type Element is private;
> package Generic_Stack is
> =A0 =A0type Stack is limited private;
> =A0 =A0...
> end Generic_Stack;
>
> The common base is the [generic] interface of Stack, which all instances
> share, which every programmer has in mind talking about stack.

Do you mean that every container supports push and pop operations
(actually Append, Last_Element, Delete_Last, etc.)?

> > How can I use it?
>
> You cannot, which is the problem of generics.

Or maybe not generics in general, but the specific approach to
generics that was chosen by Ada.
Remember, in C++ this is not a problem:

#include <vector>
#include <list>

template <class ContainerOfInts>
void appendThreeInts(ContainerOfInts & c)
{
    c.push_back(7);
    c.push_back(42);
    c.push_back(123);
}

int main()
{
    std::vector<int> vec;
    std::list<int> lst;

    appendThreeInts(vec);
    appendThreeInts(lst);
}

The appendThreeInts function uses the implicit common interface, even
though vector and list do not share anything explicitly.

--
Maciej Sobczak * http://www.inspirel.com

YAMI4 - Messaging Solution for Distributed Systems
http://www.inspirel.com/yami4