From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=0.6 required=5.0 tests=BAYES_20,INVALID_MSGID autolearn=no autolearn_force=no version=3.4.4 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: fac41,c52c30d32b866eae X-Google-Attributes: gidfac41,public X-Google-Thread: 1108a1,c52c30d32b866eae X-Google-Attributes: gid1108a1,public X-Google-Thread: 103376,2ea02452876a15e1 X-Google-Attributes: gid103376,public From: astor@pvv.unit.no (Alexander Kjeldaas) Subject: Re: Real OO Date: 1996/05/15 Message-ID: #1/1 X-Deja-AN: 154950404 sender: astor@noname.guardian.no references: organization: Norwegian University of Science and Technology newsgroups: comp.lang.eiffel,comp.lang.ada,comp.object Date: 1996-05-15T00:00:00+00:00 List-Id: Robert A Duff writes: > I believe that in Eiffel, a precondition can refer to a private data > item, of which the client knows nothing. This is incorrect and would violate validity rule VAPE: "A Precondition of a routine r of class C is valid if and only if every feature whose final name appears in any Assertion_clause is available to every class to which r is available." astor Alexander Kjeldaas http://www.stud.unit.no/~astor/ Stud.techn astor@guardian.no -- Alexander Kjeldaas http://www.stud.unit.no/~astor/ Guardian Networks AS astor@guardian.no