C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  why there is no function named mem_data in c++ standard?          C++Talk.NET Forum Index -> C++ language, library and standards View previous topic :: View next topic   Author Message Leo Jay Guest Posted: Mon Oct 16, 2006 6:14 pm    Post subject: why there is no function named mem_data in c++ standard? since there is a function named mem_fun in c++ standard which returns an adptor for member functions, i'd like to know, why there is no function named mem_data which may return an adptor for member data? if there was one, we could do something like this: typedef pair<int, double> IDPAIR; vector<IDPAIR> vct; // get the sum of the first elements int sf = sum(vct.begin(), vct.end(), mem_data(&IDPAIR::first)); // get the sum of the second elements double ss = sum(vct.begin(), vct.end(), mem_data(&IDPAIR::second)); am i right? thanks, -- Best Regards, Leo Jay --- [ 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://www.comeaucomputing.com/csc/faq.html ] Back to top Pete Becker Guest Posted: Mon Oct 16, 2006 10:17 pm    Post subject: Re: why there is no function named mem_data in c++ standard? Leo Jay wrote: Quote: since there is a function named mem_fun in c++ standard which returns an adptor for member functions, i'd like to know, why there is no function named mem_data which may return an adptor for member data? Its name is std::tr1::mem_fn. Also std::tr1::bind. In addition, the function call operators for std::tr1::reference_wrapper and std::tr1:function also treat a pointer to member data as a callable object. For more details, see chapter 6 of my book, "The Standard C++ Library Extensions." -- -- Pete Author of "The Standard C++ Library Extensions: a Tutorial and Reference." For more information about this book, see www.petebecker.com/tr1book. --- [ 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://www.comeaucomputing.com/csc/faq.html ] 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, library and standards 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.