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From: Pascal Obry <p.obry@wanadoo.fr>
Newsgroups: comp.lang.ada
Subject: Re: status of Ada STL?
Date: 19 Jun 2002 10:09:57 +0200
Organization: Home - http://perso.wanadoo.fr/pascal.obry
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Robert A Duff <bobduff@shell01.TheWorld.com> writes:

> It *is* a language issue.  It would be possible to design a language in

Yes I got it now. 

   A := A + 1           <- do the addition, copy back to A

is not equivalent to

   A += 1               <- in-place addition

I have never thought about that :(

Now, a compiler can trivially optimize this if A is a scalar. In the case of
complex types (like matrix) it is quite harder as the compiler must be sure
that each value in A will be use only once. For matrix this is fine for +=
and -= only though...

Anyway I agree that this is a notation that help compiler optimize the code. I
still think that this should not be added to Ada.

Pascal.

-- 

--|------------------------------------------------------
--| Pascal Obry                           Team-Ada Member
--| 45, rue Gabriel Peri - 78114 Magny Les Hameaux FRANCE
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--|         http://perso.wanadoo.fr/pascal.obry
--| "The best way to travel is by means of imagination"
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