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From: tynor@atlanta.twr.com (Steve Tynor)
Subject: Re: Real OO
Date: 1996/05/14
Message-ID: <TYNOR.96May14100156@twratl.atlanta.twr.com>#1/1
X-Deja-AN: 154778909
sender: tynor@atlanta.twr.com (Steve Tynor)
references: <DrCw99.E3L.0.-s@inmet.camb.inmet.com>
 <DrDus7.Dno@assip.csasyd.oz>
organization: Tower Technology
newsgroups: comp.lang.eiffel,comp.lang.ada,comp.object
Date: 1996-05-14T00:00:00+00:00
List-Id: <comp.lang.ada>


In article <DrEAyt.Hp3@world.std.com> bobduff@world.std.com (Robert A Duff) writes:

| Don Harrison <donh@syd.csa.com.au> wrote:
| >Someone correct me if wrong, but in the contracting scheme of things, 
| >the client would need to be aware of *all* the requisite conditions that 
| >make a call legal, irrespective of whether they pertain to the target of the 
| >call or another object. In this sense, all preconditions are client-oriented. 
| 
| I believe that in Eiffel, a precondition can refer to a private data
| item, of which the client knows nothing.

In fact, such a precondition would be a violation of the VAPE validity
rule (section 9.8, ETL). Our compiler treats this as only a Warning
(since there are several PD libraries that use this construct), though
technically it should be an Error.

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Eiffel: Accept no substitutes.

Steve Tynor		Email:   Steve.Tynor@atlanta.twr.com
Tower Technology 	WWW:     http://www.twr.com/