C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Vector and classes          C++Talk.NET Forum Index -> C++ language (comp.lang.c++) View previous topic :: View next topic   Author Message Michael Guest Posted: Sun Dec 24, 2006 10:10 am    Post subject: Vector and classes Hi, I am new to C++ and have run into the following problem. I have written some functions which return a vector e.g vector<double> myfunction(double arg1,.......,.....) { } I woud like to create a class out of this functions, however I dont know how to write the header file correctly, when i use: #ifndef MYCLASS_H #define MYCLASS_H vector<double> myfunction(double arg1,.......,.....); #endif I get the error the vector is not template. Would be great if somebody could help. Happy x-mas to everyone Michael Back to top Mirek Fidler Guest Posted: Sun Dec 24, 2006 10:10 am    Post subject: Re: Vector and classes Michael wrote: Quote: Hi, I am new to C++ and have run into the following problem. I have written some functions which return a vector e.g vector<double> myfunction(double arg1,.......,.....) { } I woud like to create a class out of this functions, however I dont know how to write the header file correctly, when i use: #ifndef MYCLASS_H #define MYCLASS_H vector<double> myfunction(double arg1,.......,.....); std::vector<double> myfunction(double arg1,.......,.....); Also note that this is quite fragile performance-wise, if RVO is not used to optimize out the copy of vector (-> because of inferior compiler or specific situation). Perhaps the better solution here is myfunction(std::vector<double>& , ....); Back to top Gianni Mariani Guest Posted: Sun Dec 24, 2006 10:10 am    Post subject: Re: Vector and classes Michael wrote: Quote: Hi, I am new to C++ and have run into the following problem. I have written some functions which return a vector e.g vector<double> myfunction(double arg1,.......,.....) { } I woud like to create a class out of this functions, however I dont know how to write the header file correctly, when i use: #ifndef MYCLASS_H #define MYCLASS_H #include <vector> Quote: vector<double> myfunction(double arg1,.......,.....); std::vector<double> myfunction(double arg1,.......,.....); Quote: #endif I get the error the vector is not template. Would be great if somebody could help. Firstly you need to include <vector> and second you need to specify which namespace. Since you're using it in a header, you should not do a "using namespace std". My preference is to fully quality the namespace on each use in the header. 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.