From -3301407785606099100 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: f78e5,e94695845965b249 X-Google-Attributes: gidf78e5,public X-Google-ArrivalTime: 1992-12-08 06:34:40 PST Path: sparky!uunet!mdcbbs!swordfish!alanb Newsgroups: comp.std.c++ Subject: Re: Zero-length structures and pointer comparisons Message-ID: From: alanb@sdl.mdcbbs.com (Alan Braggins) Date: 08 Dec 92 11:55:47 GMT References: <1992Dec2.111003.23102@jyu.fi> <1992Dec2.205330.10372@meaddata.com><1992Dec4.070720.13056@lth.se> <1992Dec07.222242.18703@microsoft.com> Organization: Shape Data (Division of EDS), Cambridge UK Nntp-Posting-Host: 134.244.153.110 In-reply-to: jimad@microsoft.com's message of 07 Dec 92 22:22:42 GMT Lines: 17 >>>>> On 07 Dec 92 22:22:42 GMT, jimad@microsoft.com (Jim Adcock) said: > If you want to compare addresses, then compare addresses. If you > want to compare pointers, then compare pointers. A pointer is not > an address. An address is one particular implementation of a pointer. > If you want to compare addresses, the following works on all computers > and compilers I've ever had to deal with: > if (((long)ptr_a) > ((long)ptr_b)) > blah(); For pointers to functions? pointers to virtual member functions? -- Alan Braggins, alanb@sdl.mdcbbs.com, abraggins@cix.compulink.co.uk Shape Data - A division of EDS-Scicon Limited. Cambridge, UK +44-223-316673 "Any technology distinguishable from magic is insufficiently advanced." "My employer does not necessarily share my views - but I'm working on it."