From 4815249355350092235 X-Google-Language: ENGLISH,ASCII X-Google-Thread: f78e5,fb1a92fa405c930c X-Google-Attributes: gidf78e5,public From: James.Kanze@dresdner-bank.com Subject: Re: nested functions Date: 1999/06/16 Message-ID: <7k5vjh$r0d$1@nnrp1.deja.com>#1/1 X-Deja-AN: 490113686 Approved: Fergus Henderson References: <7jd4c5$nup$1@nnrp1.deja.com> <7jjjr6$r02$1@nnrp1.deja.com> <7jma5c$i85@abyss.West.Sun.COM> <7jmdcv$a56$1@engnews1.eng.sun.com> <7jrqf5$op5$1@nnrp1.deja.com> <7jrv0r$dfq$1@engnews1.eng.sun.com> X-Original-Date: Tue, 15 Jun 1999 16:39:16 GMT X-Http-User-Agent: Mozilla/4.6 [en] (WinNT; I) X-Complaints-To: news@news.unimelb.edu.au X-Http-Proxy: 1.0 x32.deja.com:80 (Squid/1.1.22) for client 193.194.7.71 X-Trace: izvestia.its.unimelb.edu.au 929505467 16695 128.250.29.16 (16 Jun 1999 03:57:47 GMT) Organization: Deja.com - Share what you know. Learn what you don't. X-Article-Creation-Date: Tue Jun 15 16:39:16 1999 GMT X-Auth: PGPMoose V1.1 PGP comp.std.c++ iQBFAgUAN2cgpuEDnX0m9pzZAQHhDwF+PCtY7ltTCTTR3DZlUZPGwaz14RT9ASI9 ec79IIi1yZTsvBIxacilP/w8ocGi2dkK =uRT4 NNTP-Posting-Date: 16 Jun 1999 03:57:47 GMT Newsgroups: comp.std.c++ In article <7jrv0r$dfq$1@engnews1.eng.sun.com>, clamage@eng.sun.com (Steve Clamage) wrote: > C++ has enough different scope control mechanisms you don't need > local functions the way you need them in, say, Pascal. The > primary reason to have local functions in C++ would be to > implement closures. If you just want to share state among > cooperating functions, use a class. The code will be simpler > and easier to maintain. Just a question of vocabulary, but what is a closure, exactly. I've always thought that, in layman's terms, it extended the life of the local context beyond the return from the function. I think that this is how it works in lisp (but my lisp experience is limited to customizing emacs, so I'm not sure). And of course, Borland has invented a totally different meaning. What you are describing would seem to be closure as I understand it, but without the extended lifetime. Or are you suggesting that Pascal extended the lifetime of the function context beyond the return from the function if the address of the function was taken. (The Pascal I used didn't, but there are so many variations of Pascal, it's hard to know what is standard, and what is fantasy on the part of the implementer.) -- James Kanze mailto: James.Kanze@dresdner-bank.com Conseils en informatique orient�e objet/ Beratung in objekt orientierter Datenverarbeitung Ziegelh�ttenweg 17a, 60598 Frankfurt, Germany Tel. +49 (069) 63 19 86 27 Sent via Deja.com http://www.deja.com/ Share what you know. Learn what you don't. --- [ comp.std.c++ is moderated. To submit articles, try just posting with ] [ your news-reader. If that fails, use mailto:std-c++@ncar.ucar.edu ] [ --- Please see the FAQ before posting. --- ] [ FAQ: http://reality.sgi.com/austern_mti/std-c++/faq.html ]