C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Iterators and pointers in vector<T>::insert()          C++Talk.NET Forum Index -> C++ language (comp.lang.c++) View previous topic :: View next topic   Author Message Alex Vinokur Guest Posted: Tue Jul 11, 2006 9:10 am    Post subject: Iterators and pointers in vector<T>::insert() vector<int> v (100); v.insert( v.begin() + 5, 12 ); // ---------------------------------- // Is this legal? v.insert( &v[5], 17 ); // P.S. Microsoft VC7 allows that // ---------------------------------- -- Alex Vinokur email: alex DOT vinokur AT gmail DOT com http://mathforum.org/library/view/10978.html http://sourceforge.net/users/alexvn Back to top Guest Posted: Tue Jul 11, 2006 9:10 am    Post subject: Re: Iterators and pointers in vector<T>::insert() Alex Vinokur wrote: Quote: vector<int> v (100); v.insert( v.begin() + 5, 12 ); // ---------------------------------- // Is this legal? v.insert( &v[5], 17 ); Depends. On implementations where vector<T>::iterator is a T*, yes. On others, no. Not portable, therefore. HTH, Michiel Salters Back to top Robbie Hatley Guest Posted: Tue Jul 11, 2006 9:10 am    Post subject: Re: Iterators and pointers in vector<T>::insert() "Alex Vinokur" <alexvn (AT) users (DOT) sourceforge.net> wrote: Quote: vector<int> v (100); v.insert( v.begin() + 5, 12 ); v.insert( &v[5], 17 ); // Is this legal? No. Quote: // P.S. Microsoft VC7 allows that With some compilers, that will compile and run without error, because std::vector<whatever>::iterator is often implimented in terms of a "whatever*". But no, it's not legal, nor advisible, nor portable. Your "v.begin() + 5" is perfectly acceptable, though. The standard specifically requires random-access iterators (such as vector<whatever>::iterator ) to be capable of having integers added and subtracted from them. -- Cheers, Robbie Hatley East Tustin, CA, USA lone wolf intj at pac bell dot net (put "[usenet]" in subject to bypass spam filter) http://home.pacbell.net/earnur/ 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 (comp.lang.c++) 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.