C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  template instantiation syntax          C++Talk.NET Forum Index -> C++ language (comp.lang.c++) View previous topic :: View next topic   Author Message Faheem Mitha Guest Posted: Sun Oct 30, 2005 5:53 pm    Post subject: template instantiation syntax Hi, On the net, I found the following article, http://www.gamedev.net/reference/articles/article2097.asp describing a generic factory class. My question is about one of the links pointed to by the article, namely http://downloads.gamedev.net/features/programming/objectfactory/listing4.h The code in listing4.h includes syntax like **************************************************************************** template<typename BaseClassType, typename Param1Type, typename UniqueIdType> class ObjectFactory<BaseClassType (Param1Type), UniqueIdType> { protected: typedef BaseClassType (*CreateObjectFunc)(Param1Type); [...] **************************************************************************** From the article, it looks like he is using the structure of templates parameters after the class name to instantiate the template, eg. ObjectFactory<Shape *(int), std::string> shape_factory; Here Shape * == BaseClassType int == Param1Type std::string == UniqueIdType I've never seen syntax like this, so I'm wondering what is going on. Does anyone have an idea? Is this even legal C++ syntax? Thanks in advance. Faheem. Back to top Faheem Mitha Guest Posted: Sun Oct 30, 2005 9:57 pm    Post subject: Re: template instantiation syntax On Sun, 30 Oct 2005 17:53:54 GMT, Faheem Mitha <faheem (AT) email (DOT) unc.edu> wrote: Quote: Hi, On the net, I found the following article, http://www.gamedev.net/reference/articles/article2097.asp describing a generic factory class. My question is about one of the links pointed to by the article, namely http://downloads.gamedev.net/features/programming/objectfactory/listing4.h The code in listing4.h includes syntax like **************************************************************************** template<typename BaseClassType, typename Param1Type, typename UniqueIdType class ObjectFactory { protected: typedef BaseClassType (*CreateObjectFunc)(Param1Type); [...] **************************************************************************** From the article, it looks like he is using the structure of templates parameters after the class name to instantiate the template, eg. ObjectFactory Here Shape * == BaseClassType int == Param1Type std::string == UniqueIdType I missed the template <typename CtorSignature, typename UniqueIdType> class ObjectFactory; at the top. So this is a class-template partial specialization of ObjectFactory, though not of a kind I have seen before. Have I understood this correctly? Thanks. Faheem. 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.