C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Static data memer          C++Talk.NET Forum Index -> C++ language (comp.lang.c++) View previous topic :: View next topic   Author Message Surya Kiran Guest Posted: Wed Jan 28, 2004 6:57 am    Post subject: Static data memer Hi all, I've 2 classes class A, and class B. and i want to use list of type B in class A. like this list<B> typeB ; till now its fine. But i want to make it a static member. like static list<B> typeB ; declaration is not a problem. Definition is the problem. I've 2 constructors for class B 1. default constructor B() 2. B (int a, int b) how can i define the static member in class A, for both the constructors. Thanks in advance, Surya Back to top Sharad Kala Guest Posted: Wed Jan 28, 2004 9:03 am    Post subject: Re: Static data memer "Surya Kiran" <skg (AT) fluent (DOT) co.in> wrote Quote: Hi all, I've 2 classes class A, and class B. and i want to use list of type B in class A. like this list<B> typeB ; till now its fine. But i want to make it a static member. like static list<B> typeB ; declaration is not a problem. Definition is the problem. I've 2 constructors for class B 1. default constructor B() 2. B (int a, int b) how can i define the static member in class A, for both the constructors. How about posting the code and the error you get ? Back to top lilburne Guest Posted: Wed Jan 28, 2004 9:38 am    Post subject: Re: Static data memer Surya Kiran wrote: Quote: how can i define the static member in class A, for both the constructors. Static members are only constructed once, so as you don't get to construct it multiple times, therefor choose the B ctor that is most relevant. Most probably the default one. Back to top Peter Koch Larsen Guest Posted: Wed Jan 28, 2004 12:12 pm    Post subject: Re: Static data memer "Surya Kiran" <skg (AT) fluent (DOT) co.in> skrev i en meddelelse news:5946f326.0401272257.49312d40 (AT) posting (DOT) google.com... Quote: Hi all, I've 2 classes class A, and class B. and i want to use list of type B in class A. like this list<B> typeB ; This name is confusing - it is not a type. Quote: till now its fine. But i want to make it a static member. like static list<B> typeB ; declaration is not a problem. Definition is the problem. I've 2 constructors for class B 1. default constructor B() 2. B (int a, int b) how can i define the static member in class A, for both the constructors. Thanks in advance, Surya Well... a static member - if this is what you want - is not declared in a constructor. This is what you want: // header #include <list> class B {}; class A { static std::list<B> list_of_b; }; // source std::list<B> A::list_of_b; Kind regards Peter Back to top Surya Kiran Guest Posted: Thu Feb 05, 2004 1:51 pm    Post subject: Re: Static data memer My question is how do we initialize a pointer to static member. if its a ordinary class (class MyClass) we can initialize it to NULL, but my question is //someclass.hpp class someclass { .... static list<MyClass> *mylist ; //declaring is over. .... }; //Lets assume i'm initialize it in someclass.cpp //how do i initialize it. //obviously not like this // list<MyClass>* someclass::mylist = 0; Please clarify. Thanks in advance, Surya "Peter Koch Larsen" <pklspam (AT) mailme (DOT) dk> wrote Quote: "Surya Kiran" <skg (AT) fluent (DOT) co.in> skrev i en meddelelse news:5946f326.0401272257.49312d40 (AT) posting (DOT) google.com... Hi all, I've 2 classes class A, and class B. and i want to use list of type B in class A. like this list<B> typeB ; This name is confusing - it is not a type. till now its fine. But i want to make it a static member. like static list<B> typeB ; declaration is not a problem. Definition is the problem. I've 2 constructors for class B 1. default constructor B() 2. B (int a, int b) how can i define the static member in class A, for both the constructors. Thanks in advance, Surya Well... a static member - if this is what you want - is not declared in a constructor. This is what you want: // header #include <list class B {}; class A { static std::list }; // source std::list<B> A::list_of_b; Kind regards Peter Back to top Victor Bazarov Guest Posted: Thu Feb 05, 2004 2:57 pm    Post subject: Re: Static data memer "Surya Kiran" <skg (AT) fluent (DOT) co.in> wrote... Quote: My question is how do we initialize a pointer to static member. And your example shows a static member that is a pointer, not a pointer to static member. Do you actually know what you want? Quote: if its a ordinary class (class MyClass) we can initialize it to NULL, You can initialise any pointer to 0, regardless what it points to. Quote: but my question is //someclass.hpp class someclass { ... static list<MyClass> *mylist ; //declaring is over. ... }; //Lets assume i'm initialize it in someclass.cpp //how do i initialize it. //obviously not like this // list<MyClass>* someclass::mylist = 0; Yes, that's the way, if you want to be explicit. Static data are initialised to 0 anyway, even if you don't provide an initialiser. Quote: Please clarify. Thanks in advance, Surya "Peter Koch Larsen" <pklspam (AT) mailme (DOT) dk> wrote "Surya Kiran" <skg (AT) fluent (DOT) co.in> skrev i en meddelelse news:5946f326.0401272257.49312d40 (AT) posting (DOT) google.com... Hi all, I've 2 classes class A, and class B. and i want to use list of type B in class A. like this list<B> typeB ; This name is confusing - it is not a type. till now its fine. But i want to make it a static member. like static list<B> typeB ; declaration is not a problem. Definition is the problem. I've 2 constructors for class B 1. default constructor B() 2. B (int a, int b) how can i define the static member in class A, for both the constructors. Thanks in advance, Surya Well... a static member - if this is what you want - is not declared in a constructor. This is what you want: // header #include <list class B {}; class A { static std::list }; // source std::list<B> A::list_of_b; Kind regards Peter 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.