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From: Martin Krischik <krischik@users.sourceforge.net>
Newsgroups: comp.lang.ada
Subject: Re: Dynamically tagged expression required
Date: Mon, 12 Dec 2005 20:16:37 +0100
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Date: 2005-12-12T20:16:37+01:00
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Matthew Heaney wrote:

> Martin Krischik <krischik@users.sourceforge.net> writes:
> 
>> This is of corse true. It is just that my first container library was IBM
>> Open-Class-Library. The OCL is a far higher level container library when
>> compared to the STL. And as such I prefer the Booch-Components over the
>> Ada.Containers.
> 
> Why do you say that the OCL is a "higher-level library" than the STL or
> the Ada
> standard library?  In the STL you say:
> 
>   map_t m;
>   //...
>   m[k] = e;
>   m.erase(k);
> 
> and in Ada you say:
> 
>   M : Map;
> begin
>   --...
>   M.Include (K, E);
>   M.Exclude (K);

It's the interface. i.E. The STL cursors tries to mimic the C pointer
behavior. Pointer arithmetic is low-level in my eyes.

The OCL rather tries to mimic a simple database. And databases are more high
level then pointers in my eyes.

> How much more high-level can a library be?  Considering your description
> of the OCL (given in another post), did you really mean that it's more
> low-level?

That depends where you enter the class Hirachie. If you jump in at the
abstract (IA..) or generic (IG...) level then yes you get your hands dirty
by low level stuff. But at least you can.

Martin

-- 
mailto://krischik@users.sourceforge.net
Ada programming at: http://ada.krischik.com