C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  multiple parameters          C++Talk.NET Forum Index -> C++ Language (Moderated) View previous topic :: View next topic   Author Message Mario Guest Posted: Fri Feb 13, 2004 11:14 am    Post subject: multiple parameters Hi together I have to support interfaces with different number of parameters. My template solution looks like this: template <typename T1> classA(T1 t1) .... template <typename T1, typename T2> classA(T1 t1, T2 t2) .... template <typename T1, typename T2, typename T3> classA(T1 t1, T2 t2, T3 t3) .... and so on... Is there a way to generalize/simplify this problem to one interface? Thanks Mario [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top Jonathan Turkanis Guest Posted: Thu Feb 19, 2004 1:38 pm    Post subject: Re: multiple parameters "Mario" <chruetli (AT) gmx (DOT) net> wrote Quote: Hi together I have to support interfaces with different number of parameters. My template solution looks like this: template classA(T1 t1) ... template classA(T1 t1, T2 t2) ... template classA(T1 t1, T2 t2, T3 t3) ... and so on... Is there a way to generalize/simplify this problem to one interface? I can't say whether the interface can be simplified without knowing more. Your interface follows a common pattern, however, and if you can't simplify it there is no particular reason to avoid it. You might save yourself some typing and maintenance problems by using the Boost Preprocessor library: http://www.boost.org/libs/preprocessor/doc/index.html Jonathan [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top Hendrik Schober Guest Posted: Sat Feb 21, 2004 4:22 am    Post subject: Re: multiple parameters Mario <chruetli (AT) gmx (DOT) net> wrote: Quote: Hi together I have to support interfaces with different number of parameters. My template solution looks like this: template <typename T1 classA(T1 t1) ... template classA(T1 t1, T2 t2) ... template classA(T1 t1, T2 t2, T3 t3) ... and so on... I'm not sure what the 'classA(T1,T2,T3)' syntax refers to. Quote: Is there a way to generalize/simplify this problem to one interface? I have used compile-time lists for calling functions. The basic idea is like this: class nil {}; template< typename Head, typename Tail > class ct_list { Head head; Tail tail; }; typedef ct_list< int , ct_list< float , ct_list< string , ct_list< X , nil > > > > my_list; template< typename func, class list > void call_func( func f, list l ); If 'f' can be called with the objects in 'l', it would be called. (Otherwise it wouldn't compile.) Maybe this could be used? Quote: Thanks Schobi -- [email]SpamTrap (AT) gmx (DOT) de[/email] is never read I'm Schobi at suespammers dot org "Sometimes compilers are so much more reasonable than people." Scott Meyers [ 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.