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From: Georg Bauhaus <sb463ba@l1-hrz.uni-duisburg.de>
Newsgroups: comp.lang.ada
Subject: Re: Reprise: 'in out' parameters for functions
Date: Fri, 9 Apr 2004 16:17:42 +0000 (UTC)
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Wojtek Narczynski <wojtek@power.com.pl> wrote:
: Several warts. For example, abstraction inversion (just look at ACT
: PolyOrb code, or try to implement tree crabbing),

I take it Ada forces abstraction in version in cases?
Could you name an example unit to look at?

: type system unable
: to express physical units,

Still, you might have

   type Quantity is abstract tagged private;

   function in_meters (x: Quantity) return Units.meter;
   function in_yards (x: Quantity) return Units.yard;
   --  etc...

: But the problem real problem IMO is that
: the development of the language has stagnated.

What's missing?