Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!ucsd!ucsbcsl!eiffel!bertrand
From: bertrand@eiffel.UUCP (Bertrand Meyer)
Newsgroups: comp.lang.eiffel
Subject: Posting on behalf of CNET users
Message-ID: <112@eiffel.UUCP>
Date: 9 Mar 89 03:25:27 GMT
Organization: Interactive Software Engineering, Santa Barbara CA
Lines: 70


	I received the following message by mail, with a mention
that it was meant for posting but did not leave Europe. It seems
appropriate to repost it. Apologies to any reader who as a consequence
will see the message twice (or more...).

	I may post a response later.

Bertrand Meyer
bertrand@eiffel.com

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Hi,
this was posted in comp.lang.eiffel, but there seems that it didn't
leave Europe. So I decided to send it to you. Here's the text :


We are just beginning to use Eiffel and are confronted with some
problems. One of them is the following :
We would like to apply routines on sets of objects, but there seems to
have problems with types. Here is an example (let us suppose that our
set is implemented as a list, and the routine that we want to distribute
is like a "procedure") :

class A
feature

   set_do_all (action : X) is
   do
       from set.start
       until set.offright
       loop
           set.value.action;
           set.forth;
       end;
   end ; -- set_do_all

end; -- class A

Our problem here is to determine what is X (the type of action). Is there
a type "routine" ? If not, we cannot define such a routine.


A second problem resides in our need to share objects between two Eiffel
process via UNIX sockets. Champ-de-Mars tells that, in release 2.2, the
routine Out will permit to flatten an object, i.e. to transform it into
a string. So, we can send it to the second process via a socket.
How can we recuperate an object at the other side (i.e. to "unflatten"
it) ?

Perhaps, these questions are not relevant. But can anyone help us ?
Any information would be appreciable. Thanks in advance.


My electronic address : ...!mcvax!inria!cnetlu!cornily
My postal address : Jean-Michel Cornily
                    CNET LAA/SLC/LCM
                    Route de Tregastel
                    22300 Lannion
                    FRANCE

You can reply by mail or news in comp.lang.eiffel

By the way, we'd like to know the electronic ou postal address of a
French Eiffel users in French Navy : Mr J. Rousselot and M. Larignon.
We saw in Champ-de-Mars that they built a real-time graphical simulation
application. Maybe, they could help us in the use of graphical classes.
Thank you.
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