C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Static member initialization without class scope operator          C++Talk.NET Forum Index -> C++ Language (Moderated) View previous topic :: View next topic   Author Message Jorge Martin-de-Nicolas Guest Posted: Sun Feb 29, 2004 4:01 am    Post subject: Static member initialization without class scope operator Hello, Can somebody tell me why the following program works OK? I have tried it and it compiles and runs OK... ------------------------------------------------------------ class A { public: static int f(); static int myValue; }; int A::myValue = f(); int A::f() { return 55; } int main(int argc, char* argv[]) { A a; std::cout << "myValue = " << a.myValue << std::endl; } ------------------------------------------------------------ I would have expected to need the scope operator A::f() when initializing A::myValue. How come just f() works? The program compiles and works under Solaris, using both the Sun Workshop compiler and the gcc compiler... I've browsed my copy of Stroustrup Special Edition, but I can't find an answer. Thanks, Jorge [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top Stephen C. Dewhurst Guest Posted: Sun Feb 29, 2004 4:47 pm    Post subject: Re: Static member initialization without class scope operato On 28 Feb 2004 23:01:08 -0500, [email]jorgemdn (AT) yahoo (DOT) com[/email] (Jorge Martin-de-Nicolas) wrote: Quote: I would have expected to need the scope operator A::f() when initializing A::myValue. How come just f() works? The program compiles and works under Solaris, using both the Sun Workshop compiler and the gcc compiler... I've browsed my copy of Stroustrup Special Edition, but I can't find an answer. The initializer of myValue is essentially in the scope of class A. See the standard, 3.3.6, point 5 in list, and 9.4.2. Note that this won't work: class A { public: typedef int Int; static Int f(); static Int myValue; }; Int A::myValue = f(); // error! Steve Steve Dewhurst www.semantics.org [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top Gabriel Dos Reis Guest Posted: Sun Feb 29, 2004 5:45 pm    Post subject: Re: Static member initialization without class scope operato [email]jorgemdn (AT) yahoo (DOT) com[/email] (Jorge Martin-de-Nicolas) writes: Quote: Hello, Can somebody tell me why the following program works OK? I have tried it and it compiles and runs OK... ------------------------------------------------------------ class A { public: static int f(); static int myValue; }; int A::myValue = f(); Standard mandated behaviour. 8.5/10: An initializer for a static member is in the scope of the member's class. [Example: int a; struct X { static int a; static int b; }; int X::a = 1; int X::b = a; // X::b = X::a --end example] -- Gabriel Dos Reis [email]gdr (AT) cs (DOT) tamu.edu[/email] Texas A&M University -- Computer Science Department 301, Bright Building -- College Station, TX 77843-3112 [ 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.