C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  overloading enumerated types          C++Talk.NET Forum Index -> C++ Language (Moderated) View previous topic :: View next topic   Author Message KublaPawn Guest Posted: Wed Jul 21, 2004 11:48 am    Post subject: overloading enumerated types Is it possible to overload an enumerated type.for example: enum square{a1,b1,c1 ... f8,g8,h8}; and use a1++; to get from one square to another. and a1+=8; to get to another row; [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top Francis Glassborow Guest Posted: Wed Jul 21, 2004 7:11 pm    Post subject: Re: overloading enumerated types In article <0AhLc.19072$Gf7.669224 (AT) news20 (DOT) bellglobal.com>, KublaPawn <KublaPawn (AT) netscape (DOT) net> writes Quote: Is it possible to overload an enumerated type.for example: enum square{a1,b1,c1 ... f8,g8,h8}; and use a1++; to get from one square to another. and a1+=8; to get to another row; Yes. Whether it is desirable or a good design is an entirely different issue. Example: square operator++(square val, int){ square temp(square(val+1)); if(temp == h temp = a1; return temp; } I have made no attempt at polishing the above. I am just providing an existence proof. -- Francis Glassborow ACCU Author of 'You Can Do It!' see http://www.spellen.org/youcandoit For project ideas and contributions: http://www.spellen.org/youcandoit/projects [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top Ulrich Eckhardt Guest Posted: Wed Jul 21, 2004 7:13 pm    Post subject: Re: overloading enumerated types KublaPawn wrote: Quote: Is it possible to overload an enumerated type.for example: enum square{a1,b1,c1 ... f8,g8,h8}; and use a1++; to get from one square to another. and a1+=8; to get to another row; Yes, you can overload operators for enumerations. No, the expressions 'a1++' and 'a1+=8' will never make sense, as 'a1' is a constant. 'square s = a1; s++;' makes sense though. Uli -- FAQ: http://parashift.com/c++-faq-lite/ /* bittersweet C++ */ default: break; [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top Victor Bazarov Guest Posted: Wed Jul 21, 2004 8:03 pm    Post subject: Re: overloading enumerated types KublaPawn wrote: Quote: Is it possible to overload an enumerated type.for example: enum square{a1,b1,c1 ... f8,g8,h8}; and use a1++; to get from one square to another. and a1+=8; to get to another row; Yes, partially. The term is "overload some operators for an enumerated type", not "overload an enumerated type". You should be able to overload the post-increment, but not the compound assignment. square operator++(square& s, int) { square r = s; // here you define how to move from one to another // and change 's' accordingly return r; } The assignment operator has to be a member, and since enums are not classes, they can't have members. V [ 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.