Re: Backward compatibility between Ada 95 and Ada 83

["W. Wesley Groleau x4923" <wwgrol@pseserv3.fw.hac.com>]

James H. Robinson, III wrote:
> I'm using an Ada 95 compiler, but my class is teaching Ada 83.  How
> backwardly compatible is Ada 95 with Ada 83?

Interesting that the three responses so far have very little overlap.
There is a "Compatibility Guide" by Taylor somewhere in the depths
of the AdaIC which lists MANY incompatibilities.  However, most of
them are of little _practical_ consequence.

In one porting effort, I saw all that were mentioned by Stanbrough,
Tardieu, and Herro, plus two more:

1. Character literals can be ambiguous with Wide_Character literals.

2. change in "freezing" rules.
   (Long ago on a particular project, it was thought that not
   putting representation specifications in the private part
   violated information hiding.  This resulted in a lot of
   tedious error-prone rearranging when porting to Ada 95.)

-- 
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    Wes Groleau, Hughes Defense Communications, Fort Wayne, IN USA
Senior Software Engineer - AFATDS                  Tool-smith Wanna-be

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