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From: mab@dst1.wdl.loral.com (Mark A Biggar)
Subject: Re: Safety-critical development in Ada and Eiffel
Date: 1997/08/12
Message-ID: <5sq3fh$frg@wdl1.wdl.lmco.com>#1/1
X-Deja-AN: 263866820
References: <5siqrr$3of@jupiter.milkyway.org>
 <5smgts$p68$1@miranda.gmrc.gecm.com> <33EFCCE4.4CE0@flash.net>
Organization: Lockheed Martin Western Development Labs
Newsgroups: comp.object,comp.software-eng,comp.lang.ada,comp.lang.eiffel
Date: 1997-08-12T00:00:00+00:00
List-Id: <comp.lang.ada>


In article <33EFCCE4.4CE0@flash.net> Ken.Garlington@computer.org writes:
>Paul Johnson wrote:
>Leaving out executable assertions is just as easy as leaving out
>non-executable
>ones, isn't it?

Sure, even if assertions are required by the language syntax,
you can always just use the assertion "true" :-).
You can't even make using the assertion "true" illegal as there are
cases where the assertion "true" is exactly the correct assertion to 
use; for example, using "true" as a precondition for a method documents the
fact that it has NO enviromential requirements at all. (E.G. a random
number routine or the Unix exit() call).  And, what is the postcondition
for printf()?

--
Mark Biggar
mab@wdl.lmco.com