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From: Didier Utheza <ddutheza@bu.edu>
Newsgroups: comp.lang.ada
Subject: About private types and reusability?
Date: Fri, 13 Jul 2001 18:55:03 -0400
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Date: 2001-07-13T18:55:03-04:00
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There was an interesting comparison on the net of c++, Ada95 and Modula3.
The only critic of Ada was about the inclusion of the description of the
private type in the specification rather than the body of the module.
Modula3 keeps everything private in the body. I know that it was question
to create a third type of file that would have described the private type.
The idea was abandoned because having to deal with three files for one
module will not have simplify things. So my question, if anybody has an
answer, is why this choice. The inclusion of the private type defenition
in the body should keep things modular. The specifications describing to
the user the method to access the object in a transparent way. By
including the private type def. in the specifications, any following
change means that you not only have to recompile the module but also the
whole program since the specifications changed. Where is the advantage?
Thanks for any answer.
				Didier Utheza.