C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Why does it apply to non-template but not to template?          C++Talk.NET Forum Index -> C++ language, library and standards View previous topic :: View next topic   Author Message MichaelLi Guest Posted: Fri May 07, 2004 4:31 pm    Post subject: Why does it apply to non-template but not to template? //Simple testcase: // #include <iostream> #include <string> template<typename T> void f(T, const std::string); template<typename T> void f(T, const std::string s = " ") {} void g(T, const std::string); void g(T, const std::string s = " ") {} int main() { f(1); // error, why? g(1); // OK } I use gcc 3.33 and it reads "error: no matching function for call to `fun(int)' ". In the C++ Standard 8.3.6.4, it specifies "For non-template functions, default arguments can be added in later declarations". It seems that the code above is invalid. But why? Why does it just applies to non-template version but not to the template one? --- [ comp.std.c++ is moderated. To submit articles, try just posting with ] [ your news-reader. If that fails, use mailto:std-c++@ncar.ucar.edu ] [ --- Please see the FAQ before posting. --- ] [ FAQ: http://www.jamesd.demon.co.uk/csc/faq.html ] Back to top llewelly Guest Posted: Sat May 08, 2004 6:32 am    Post subject: Re: Why does it apply to non-template but not to template? [email]michaelli8195 (AT) hotmail (DOT) com[/email] (MichaelLi) writes: Quote: //Simple testcase: // #include #include template void f(T, const std::string); template void f(T, const std::string s = " ") {} void g(T, const std::string); void g(T, const std::string s = " ") {} int main() { f(1); // error, why? g(1); // OK } I use gcc 3.33 and it reads "error: no matching function for call to `fun(int)' ". In the C++ Standard 8.3.6.4, it specifies "For non-template functions, default arguments can be added in later declarations". It seems that the code above is invalid. But why? Why does it just applies to non-template version but not to the template one? [snip] http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/cwg_defects.html#226 --- [ comp.std.c++ is moderated. To submit articles, try just posting with ] [ your news-reader. If that fails, use mailto:std-c++@ncar.ucar.edu ] [ --- Please see the FAQ before posting. --- ] [ FAQ: http://www.jamesd.demon.co.uk/csc/faq.html ] Back to top Daniel Krügler Guest Posted: Mon May 10, 2004 11:21 pm    Post subject: Re: Why does it apply to non-template but not to template? Hello llewelly, llewelly schrieb: Quote: michaelli8195 (AT) hotmail (DOT) com (MichaelLi) writes: //Simple testcase: // #include #include template void f(T, const std::string); template void f(T, const std::string s = " ") {} void g(T, const std::string); void g(T, const std::string s = " ") {} int main() { f(1); // error, why? g(1); // OK } I use gcc 3.33 and it reads "error: no matching function for call to `fun(int)' ". In the C++ Standard 8.3.6.4, it specifies "For non-template functions, default arguments can be added in later declarations". It seems that the code above is invalid. But why? Why does it just applies to non-template version but not to the template one? [snip] http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/cwg_defects.html#226 The quoted defect report is not related to the specified problem. The poster is talking about (non-template parameter) default arguments, while report #226 is about default **template** arguments, which are currently forbidden. Greetings from Bremen, Daniel --- [ comp.std.c++ is moderated. To submit articles, try just posting with ] [ your news-reader. If that fails, use mailto:std-c++@ncar.ucar.edu ] [ --- Please see the FAQ before posting. --- ] [ FAQ: http://www.jamesd.demon.co.uk/csc/faq.html ] Back to top llewelly Guest Posted: Tue May 11, 2004 3:46 am    Post subject: Re: Why does it apply to non-template but not to template? [email]dsp (AT) bdal (DOT) de[/email] ("Daniel Krügler (nee Spangenberg)") writes: Quote: Hello llewelly, llewelly schrieb: [email]michaelli8195 (AT) hotmail (DOT) com[/email] (MichaelLi) writes: //Simple testcase: // #include #include template void f(T, const std::string); template void f(T, const std::string s = " ") {} void g(T, const std::string); void g(T, const std::string s = " ") {} int main() { f(1); // error, why? g(1); // OK } I use gcc 3.33 and it reads "error: no matching function for call to `fun(int)' ". In the C++ Standard 8.3.6.4, it specifies "For non-template functions, default arguments can be added in later declarations". It seems that the code above is invalid. But why? Why does it just applies to non-template version but not to the template one? [snip] http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/cwg_defects.html#226 The quoted defect report is not related to the specified problem. The poster is talking about (non-template parameter) default arguments, while report #226 is about default **template** arguments, which are currently forbidden. [snip] Yes, somehow I misread it. Sorry. --- [ comp.std.c++ is moderated. To submit articles, try just posting with ] [ your news-reader. 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