C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  hide zero size array with Template Meta Programming          C++Talk.NET Forum Index -> C++ Language (Moderated) View previous topic :: View next topic   Author Message laurentoget@gmail.com Guest Posted: Tue Nov 07, 2006 10:10 am    Post subject: hide zero size array with Template Meta Programming I have a template class which contains a buffer char buffer[f(T,...)]; whose size is a function of the template parameters. This works very well until the template is instanciated for a set of parameters for which f(T,...) is 0. compilers do not like zero size arrays. I have a feeling there should be a way to use template metaprogramming so that the buffer is only there when f(T,...) is >0, but do not know where to start. -- [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top James Kanze Guest Posted: Wed Nov 08, 2006 10:10 am    Post subject: Re: hide zero size array with Template Meta Programming Frederick Gotham wrote: Quote: laurentoget (AT) gmail (DOT) com: char buffer[f(T,...)]; Forgive me, but what the hell is that? At first glance, it looks like the definition of an array whose dimension is determined by a function declaration which lacks a return type. . . Presumably, he is using f() in a mathematical sense here, that the size is a function of the template parameters (and possibly other things), and he doesn't mean that the f() is a C++ function. Traditionally, T is the name of the first template type parameter, and you cannot call a C++ with a template type parameter as an argument. -- James Kanze (GABI Software) email:james.kanze (AT) gmail (DOT) com Conseils en informatique orientée objet/ Beratung in objektorientierter Datenverarbeitung 9 place Sémard, 78210 St.-Cyr-l'École, France, +33 (0)1 30 23 00 34 -- [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top laurentoget@gmail.com Guest Posted: Thu Nov 09, 2006 5:05 pm    Post subject: Re: hide zero size array with Template Meta Programming James Kanze wrote: Quote: Frederick Gotham wrote: laurentoget (AT) gmail (DOT) com: char buffer[f(T,...)]; Forgive me, but what the hell is that? At first glance, it looks like the definition of an array whose dimension is determined by a function declaration which lacks a return type. . . Presumably, he is using f() in a mathematical sense here, that the size is a function of the template parameters (and possibly other things), and he doesn't mean that the f() is a C++ function. Traditionally, T is the name of the first template type parameter, and you cannot call a C++ with a template type parameter as an argument. exactly, merci, James, Laurent -- [ 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.