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=-1.3 required=5.0 tests=BAYES_00,INVALID_MSGID autolearn=no autolearn_force=no version=3.4.4 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 109fba,b87849933931bc93 X-Google-Attributes: gid109fba,public X-Google-Thread: fac41,b87849933931bc93 X-Google-Attributes: gidfac41,public X-Google-Thread: f43e6,b87849933931bc93 X-Google-Attributes: gidf43e6,public X-Google-Thread: 103376,b87849933931bc93 X-Google-Attributes: gid103376,public X-Google-Thread: 1108a1,b87849933931bc93 X-Google-Attributes: gid1108a1,public X-Google-Thread: 114809,b87849933931bc93 X-Google-Attributes: gid114809,public From: fjh@mundook.cs.mu.OZ.AU (Fergus Henderson) Subject: Re: OO, C++, and something much better! Date: 1997/01/15 Message-ID: <5bj43d$ak3@mulga.cs.mu.OZ.AU>#1/1 X-Deja-AN: 210025863 references: <5bie2d$eat$1@news.nyu.edu> organization: Comp Sci, University of Melbourne newsgroups: comp.lang.c++,comp.lang.smalltalk,comp.lang.eiffel,comp.lang.ada,comp.object,comp.software-eng Date: 1997-01-15T00:00:00+00:00 List-Id: kenner@lab.ultra.nyu.edu (Richard Kenner) writes: >In article dewar@merv.cs.nyu.edu (Robert Dewar) writes: >>equally if you do something like >> >> (x = p; x < &p[10]; p += 3) >> >>you can find you have an infinite loop, all quite in accordance with the >>C semantics, although somewhat surprising. > >This case must work. Such a reference to the end of an object is required >to be treated like a reference within the object. No, you missed the subtle point of Robert Dewar's example. (Robert could obviously get a job advertising PC-LINT if he wanted ;-) If it was `p++' rather than `p += 3', you would be right, but since it is `p += 3', the behaviour is undefined -- ANSI/ISO C only allows a reference to one past the end of an object, not two past the end. -- Fergus Henderson | "I have always known that the pursuit WWW: | of excellence is a lethal habit" PGP: finger fjh@128.250.37.3 | -- the last words of T. S. Garp.