C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  parameter lists in C++          C++Talk.NET Forum Index -> C++ Language (Moderated) View previous topic :: View next topic   Author Message Chris Finlayson Guest Posted: Thu Dec 11, 2003 12:06 pm    Post subject: parameter lists in C++ Hi all, I was wondering if there's an existing library out there that supports something along the lines of Java's ParameterList concept (look for it in the list of classes at [url]http://java.sun.com/products/java-media/jai/forDevelopers/jai-apidocs/index.html)[/url]. The goal is as follows: 1. Have a class define inside of it parameters it needs, default values, ranges, and validation. These parameters may be of different types. 2. When a person instantiates an object of this class, inquire about its list of needed parameters, and fill them where appropriate. Thanks! [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top v Guest Posted: Fri Dec 12, 2003 7:02 pm    Post subject: Re: parameter lists in C++ Hi, Quote: 1. Have a class define inside of it parameters it needs, default values, ranges, and validation. These parameters may be of different types. take a look at std::map for a container type which may fit Your needs and take a look at boost::any at www.boot.org for a generic, yet type safe wrapper. Quote: 2. When a person instantiates an object of this class, inquire about its list of needed parameters, and fill them where appropriate. You mean at runtime, well this requires a sort of reflextion (in java-speak), which is not directly supported by c++. but you can as a class always return a list of parameters required, this again would make the class user rather complicated. bye vl [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top David Abrahams Guest Posted: Sat Dec 13, 2003 2:27 am    Post subject: Re: parameter lists in C++ "v" <_qquench_at_compuserve_dot_de_ (AT) news (DOT) arcor-ip.de> writes: Quote: Hi, 1. Have a class define inside of it parameters it needs, default values, ranges, and validation. These parameters may be of different types. take a look at std::map for a container type which may fit Your needs and take a look at boost::any at www.boot.org for a generic, yet type safe wrapper. In the sandbox we have some code and tests for Python-style named parameter lists: f(33, acceleration = 9.8, name = "jumper") source: http://tinyurl.com/yzj0 test: http://tinyurl.com/yzix No docs yet, sorry. I hope you can understand it by looking at the test code. -- Dave Abrahams Boost Consulting www.boost-consulting.com [ 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.