C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Please help to judge if it's a bug of g++!          C++Talk.NET Forum Index -> C++ language (comp.lang.c++) View previous topic :: View next topic   Author Message Kevin Wan Guest Posted: Fri Feb 27, 2004 2:57 am    Post subject: Please help to judge if it's a bug of g++! I have such a program! template <typename T> struct A { template <bool b> void aaa() {} }; template <typename T> struct B { A<int> a; void bbb() { a.aaa<true>(); } }; int main() { B<int> b; b.bbb(); } $ g++ test.cc template.cc: In member function `void B<T>::bbb()': template.cc:12: syntax error before `;' token $ g++ --version g++ (GCC) 3.2.3 20030502 (Red Hat Linux 3.2.3-20) Please help to confirm if it's a bug of g++! Thanks a lot! jfwan Back to top Alf P. Steinbach Guest Posted: Fri Feb 27, 2004 3:16 am    Post subject: Re: Please help to judge if it's a bug of g++! * [email]jfwan (AT) vip (DOT) sina.com[/email] (Kevin Wan) schriebt: Quote: template <typename T struct A { template void aaa() {} }; template struct B { A void bbb() { a.aaa<true>(); } }; int main() { B<int> b; b.bbb(); } $ g++ test.cc template.cc: In member function `void B<T>::bbb()': template.cc:12: syntax error before `;' token $ g++ --version g++ (GCC) 3.2.3 20030502 (Red Hat Linux 3.2.3-20) $ g++ --version | grep GCC g++ (GCC) 3.3 $ g++ -pedantic -ansi main.cpp main.cpp:11: error: parse error before `;' token main.cpp: In member function `void B<T>::bbb()': main.cpp:12: error: parse error before `;' token $ _ However, Microsoft Visual C++ 7.1 and Comeau Online, <url: http://www.comeaucomputing.com/tryitout/>, compile the same code OK, no errors. Back to top Jonathan Turkanis Guest Posted: Fri Feb 27, 2004 3:18 am    Post subject: Re: Please help to judge if it's a bug of g++! "Kevin Wan" <jfwan (AT) vip (DOT) sina.com> wrote Quote: I have such a program! template <typename T struct A { template void aaa() {} }; template struct B { A void bbb() { a.aaa<true>(); } }; int main() { B<int> b; b.bbb(); } It's a bug. Here's a hackish workaround -- only useful if aaa isn't part of the public interface. Jonathan ----------------- template<bool b> struct dummy { }; template <typename T> struct A { template <bool b> void aaa(dummy<b>) {} }; template <typename T> struct B { A<int> a; void bbb() { a.aaa(dummy<true>()); } }; int main() { B<int> b; b.bbb(); } Back to top Ron Natalie Guest Posted: Fri Feb 27, 2004 5:39 pm    Post subject: Re: Please help to judge if it's a bug of g++! "Kevin Wan" <jfwan (AT) vip (DOT) sina.com> wrote Quote: I have such a program! template <typename T struct A void bbb() { a.aaa true is not a type name. a.aaa<bool>(); or change A::aaa to take a bool template arg. It's not clear from the code snippet you provided what you intend to do. Back to top Jonathan Turkanis Guest Posted: Fri Feb 27, 2004 5:46 pm    Post subject: Re: Please help to judge if it's a bug of g++! "Ron Natalie" <ron (AT) sensor (DOT) com> wrote Quote: "Kevin Wan" <jfwan (AT) vip (DOT) sina.com> wrote I have such a program! template <typename T struct A void bbb() { a.aaa true is not a type name. a.aaa<bool>(); or change A::aaa to take a bool template arg. It's not clear from the code snippet you provided what you intend to do. I think the OP's example is correct. true is a template argument for the member template aaa of A, which has a bool parameter, not a typename parameter. Jonathan Back to top Rob Williscroft Guest Posted: Fri Feb 27, 2004 5:59 pm    Post subject: Re: Please help to judge if it's a bug of g++! Kevin Wan wrote in news:5cea9465.0402261857.7930148f (AT) posting (DOT) google.com: Quote: I have such a program! template <typename T struct A { template void aaa() {} }; template struct B { A void bbb() { a.aaa<true>(); } This should compile, but there is a bug in gcc, replace with: void bbb() { a.template aaa<true>(); } Quote: }; int main() { B<int> b; b.bbb(); } [snip] Please help to confirm if it's a bug of g++! Yep, but it isn't in the upcoming 3.4 release. PS. I tried the above code on 4 compilers and non of them complained about the unnesassery .template Rob. -- http://www.victim-prime.dsl.pipex.com/ Back to top Ron Natalie Guest Posted: Fri Feb 27, 2004 6:07 pm    Post subject: Re: Please help to judge if it's a bug of g++! "Jonathan Turkanis" <technews (AT) kangaroologic (DOT) com> wrote Quote: I think the OP's example is correct. true is a template argument for the member template aaa of A, which has a bool parameter, not a typename parameter. Oops, so it does. Sorry about that. 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.