From -54102222699314720 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 109fba,ac06fef48c3c04df X-Google-Attributes: gid109fba,public X-Google-Thread: f78e5,ac06fef48c3c04df X-Google-Attributes: gidf78e5,public X-Google-ArrivalTime: 1995-02-02 01:13:57 PST Newsgroups: comp.lang.c++,comp.std.c++ Path: nntp.gmd.de!Germany.EU.net!howland.reston.ans.net!gatech!bloom-beacon.mit.edu!cambridge-news.cygnus.com!news.cygnus.com!news!jason From: jason@cygnus.com (Jason Merrill) Subject: Re: friends and local classes In-Reply-To: Doug Judd's message of 2 Feb 1995 01:04:55 GMT Content-Type: text/plain; charset=US-ASCII Message-ID: Sender: news@cygnus.com Nntp-Posting-Host: phydeaux.cygnus.com Organization: Cygnus Support, Mountain View, CA References: <3g5qc6$16p@news.cc.utah.edu> <3g5rei$dl8@news.panix.com> <9502801.16190@mulga.cs.mu.OZ.AU> <3glv86$dbg@hpsystem1.informatik.tu-muenchen.de> <3gpb3n$nh4@booz.bah.com> Mime-Version: 1.0 Date: Thu, 2 Feb 1995 09:13:57 GMT Lines: 13 Xref: nntp.gmd.de comp.lang.c++:88756 comp.std.c++:11302 >>>>> Doug Judd writes: > IMO, a well designed engineering application should be made up of > relatively independent, easily replaceable components with > well-defined interfaces. Once class B needs to know about the > internal workings of class A (even if B is defined within A), > I feel that it is time to redefine A and B as a single class. This is an overstatement. Consider matrices and slices, or strings and substrings -- in both these cases, the second class is a helper, and has no real existence independent of the first, but it should be a distinct class. Jason