C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Re: STL functional library          C++Talk.NET Forum Index -> C++ Language (Moderated) View previous topic :: View next topic   Author Message Roland Pibinger Guest Posted: Mon Mar 07, 2005 11:18 pm    Post subject: Re: STL functional library On 7 Mar 2005 06:19:13 -0500, Ari Lamstein <lamstein (AT) gaia (DOT) cc.gatech.edu> wrote: Quote: Hi, I'm trying to learn the right syntax for mem_fun, bind1st, etc. in the STL functional library. All of the resources that I've been able to find deal with e.g. a container of ints, but the syntax is very different if you have a container of pointers to user-defined data, and you want to call a member function on each of those objects, and supply that function with an argument. [...] Quote: int main (int argc, char * const argv[]) { using namespace std; vector<Widget*> vWidgets; for (int i = 0; i < 10; i++) { vWidgets.push_back(new Widget()); } for_each(vWidgets.begin(), vWidgets.end(), mem_fun(&Widget::PrintNum)); for_each(vWidgets.begin(), vWidgets.end(), mem_fun(&Widget::IncNum)); // what's the right syntax for the below line? //for_each(vWidgets.begin(), vWidgets.end(), bind_2nd(mem_fun(&Widget::IncNumBy)(5))); These binders and adapters never really worked out. The for loop is more generic and versatile than for_each. Try for (vector iter != vWidgets.end(); ++iter) { (**iter).IncNumBy(5); } Best wishes, Roland Pibinger [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top Pete Becker Guest Posted: Tue Mar 08, 2005 11:02 am    Post subject: Re: STL functional library Ari Lamstein wrote: Quote: // what's the right syntax for the below line? for_each(vWidgets.begin(), vWidgets.end(), bind_2nd(mem_fun(&Widget::IncNumBy)(5))); for_each(vWidgets.begin(), vWidgets.end(), bind2nd(mem_fun(&Widget::IncNumBy), 5)); -- Pete Becker Dinkumware, Ltd. (http://www.dinkumware.com) [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top Nicola Musatti Guest Posted: Tue Mar 08, 2005 9:17 pm    Post subject: Re: STL functional library I have to say that since I switched to using Boost.Bind (see http://www.boost.org) I never looked back. Cheers, Nicola Musatti [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top Early Ehlinger Guest Posted: Sat Mar 12, 2005 8:08 pm    Post subject: Re: STL functional library "Nicola Musatti" <nicola.musatti (AT) gmail (DOT) com> wrote : Quote: I have to say that since I switched to using Boost.Bind (see http://www.boost.org) I never looked back. I have had a similar experience. With regards to the OP's code... for_each ( vWidgets.begin(), vWidgets.end() , boost::bind( &Widget::PrintNum , _1 , 5 ) ); is IMHO much more readable. I used to have a bunch of headers defining binding templates, member-function-calling-functors, etc., in my library to attempt to augment the Standard and make the algorithms more usable. When I found out about Boost.Bind, I quickly added #error "USE BOOST.BIND INSTEAD OF THIS!" to all of those headers, forcing myself to switch my entire codebase over. I don't think I could write a stronger testimonial for Boost.Bind. -- -- Best Regards, - Early Ehlinger - President&CEO - ResPower, Inc - www.ResPower.com - 2.8+ THz Self-Service Render Farm from $0.25/GHz*Hr [Yes, 2.8 TeraHertz - 2,800 Gigahertz. 2,800,000 Megahertz. 2,800,000,000 Kilohertz. 2,800,000,000,000 Clock Cycles Per Second. Every second. 24 hours a day. 7 Days a week. Upload your 3D scenes and feel the speed!] [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top Early Ehlinger Guest Posted: Sun Mar 13, 2005 11:19 am    Post subject: Re: STL functional library "Nicola Musatti" <nicola.musatti (AT) gmail (DOT) com> wrote : Quote: I have to say that since I switched to using Boost.Bind (see http://www.boost.org) I never looked back. I have had a similar experience. With regards to the OP's code... for_each ( vWidgets.begin(), vWidgets.end() , boost::bind( &Widget::PrintNum , _1 , 5 ) ); is IMHO much more readable. I used to have a bunch of headers defining binding templates, member-function-calling-functors, etc., in my library to attempt to augment the Standard and make the algorithms more usable. When I found out about Boost.Bind, I quickly added #error "USE BOOST.BIND INSTEAD OF THIS!" to all of those headers, forcing myself to switch my entire codebase over. I don't think I could write a stronger testimonial for Boost.Bind. -- -- Best Regards, - Early Ehlinger - President&CEO - ResPower, Inc - www.ResPower.com - 2.8+ THz Self-Service Render Farm from $0.25/GHz*Hr [Yes, 2.8 TeraHertz - 2,800 Gigahertz. 2,800,000 Megahertz. 2,800,000,000 Kilohertz. 2,800,000,000,000 Clock Cycles Per Second. Every second. 24 hours a day. 7 Days a week. Upload your 3D scenes and feel the speed!] [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top Early Ehlinger Guest Posted: Sun Mar 13, 2005 12:28 pm    Post subject: Re: STL functional library "Nicola Musatti" <nicola.musatti (AT) gmail (DOT) com> wrote : Quote: I have to say that since I switched to using Boost.Bind (see http://www.boost.org) I never looked back. I have had a similar experience. With regards to the OP's code... for_each ( vWidgets.begin(), vWidgets.end() , boost::bind( &Widget::PrintNum , _1 , 5 ) ); is IMHO much more readable. I used to have a bunch of headers defining binding templates, member-function-calling-functors, etc., in my library to attempt to augment the Standard and make the algorithms more usable. When I found out about Boost.Bind, I quickly added #error "USE BOOST.BIND INSTEAD OF THIS!" to all of those headers, forcing myself to switch my entire codebase over. I don't think I could write a stronger testimonial for Boost.Bind. -- -- Best Regards, - Early Ehlinger - President&CEO - ResPower, Inc - www.ResPower.com - 2.8+ THz Self-Service Render Farm from $0.25/GHz*Hr [Yes, 2.8 TeraHertz - 2,800 Gigahertz. 2,800,000 Megahertz. 2,800,000,000 Kilohertz. 2,800,000,000,000 Clock Cycles Per Second. Every second. 24 hours a day. 7 Days a week. Upload your 3D scenes and feel the speed!] [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top Early Ehlinger Guest Posted: Sat Mar 19, 2005 12:53 am    Post subject: Re: STL functional library "Nicola Musatti" <nicola.musatti (AT) gmail (DOT) com> wrote : Quote: I have to say that since I switched to using Boost.Bind (see http://www.boost.org) I never looked back. I have had a similar experience. With regards to the OP's code... for_each ( vWidgets.begin(), vWidgets.end() , boost::bind( &Widget::PrintNum , _1 , 5 ) ); is IMHO much more readable. I used to have a bunch of headers defining binding templates, member-function-calling-functors, etc., in my library to attempt to augment the Standard and make the algorithms more usable. When I found out about Boost.Bind, I quickly added #error "USE BOOST.BIND INSTEAD OF THIS!" to all of those headers, forcing myself to switch my entire codebase over. I don't think I could write a stronger testimonial for Boost.Bind. -- -- Best Regards, - Early Ehlinger - President&CEO - ResPower, Inc - www.ResPower.com - 2.8+ THz Self-Service Render Farm from $0.25/GHz*Hr [Yes, 2.8 TeraHertz - 2,800 Gigahertz. 2,800,000 Megahertz. 2,800,000,000 Kilohertz. 2,800,000,000,000 Clock Cycles Per Second. Every second. 24 hours a day. 7 Days a week. 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