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From: Alfred Hilscher <Alfred.Hilscher@t-online.de>
Newsgroups: comp.lang.ada
Subject: Re: advantages or disadvantages of ADA over pascal or modula
Date: Sat, 04 Jan 2003 18:12:50 +0100
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karl bowl schrieb:
> 
> I would like to ask anybody to tell me about advantages or disadvantages of
> ADA(95) over pascal or modula(2).
> Many thanks in advance
> 
> Nic


As an advance I see sometimes the tasking that is part of the language.
It makes development of "multi-threated" applications more easy. I often
use tasks in GUI applications to do the work. This prevents the
application from blocking the desktop.

Compared to Modula-2 I see the following disadvantages:

- No equivalent to the "WITH" from Modula (Adas "with" has a totally
different meaning). This often produces long and bad readable code.

- No construct like Modulas "ARRAY OF BYTE" parameter that catches up
_all_ parameters.

- No _real_ hidden export. You can define types to be "private" in your
spec, but if you want change the definition (let's say from a pointer to
a four byte hash key), you have to change the package spec (= DEFINITION
MODULE) and then recompile _all_ importing modules (although it's only
an internal change to your implementation).

- No equivalent to the "final" from Java. So even if you made your
definition "private" everyone is allowed to declare a child package
which then can access this data.


And mostly the Ada-Compilers generate bigger exe-files than
Modula-compilers do.