C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Reseating references          C++Talk.NET Forum Index -> C++ Language (Moderated) View previous topic :: View next topic   Author Message Guest Posted: Thu Dec 28, 2006 10:10 am    Post subject: Reseating references Hi All I was always lead to believe that references were unable to be reseated. However i recently tried compiling the following code using VC8 int i = 22; int j = 44; int& ri = i; cout << "ri = " << ri << endl; ri = j; cout << "ri = " << ri << endl; which resulted in the following output: ri = 22 ri = 44 Is this correct behaviour? If yes, what does term "reseatable" mean? Thanks Andy -- [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top James Kanze Guest Posted: Mon Jan 01, 2007 2:20 am    Post subject: Concernig boost::optional, was Re: Reseating references Chris Uzdavinis wrote: Quote: (Though there are some unusual techniques to get the effect in certain cases, like what boost::optional does when it holds references.) Just wondering, but you don't need boost::optional to support optional (or reseatable) references; C++ has a built-in type which supports it directly: pointers. I don't think that using boost::optional when you want a pointer will make programs clearer. Also, of course, there's no reason to get tricky and reseat a reference. If support for references is desired (say on the grounds of completeness or orthogonality), partial specialization and using a pointer in the actual implementation is largely sufficient. (I rather suspect that the authors of boost::optional are aware of this, and that any tricky techniques involved are for general support of types not having a default constructor.) -- James Kanze (Gabi Software) email: james.kanze (AT) gmail (DOT) com Conseils en informatique orientée objet/ Beratung in objektorientierter Datenverarbeitung 9 place Sémard, 78210 St.-Cyr-l'École, France, +33 (0)1 30 23 00 34 -- [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         C++Talk.NET Forum Index -> C++ Language (Moderated) All times are GMT Page 1 of 1   Jump to: Select a forum C/C++----------------C LanguageC Language (Moderated)C++ Language (Moderated)C++ language (comp.lang.c++)C++ language, library and standards Non-English C/C++ Newsgroups----------------C++ (German)C++ (French)  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.