C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  regarding static fn          C++Talk.NET Forum Index -> C++ language (comp.lang.c++) View previous topic :: View next topic   Author Message raghavendra Guest Posted: Tue Mar 02, 2004 12:56 pm    Post subject: regarding static fn Hi , A static member can be accessed only by another static method....but the vice-versa is not true....Can anyone pls explain me the logic behind this... Also in a project, if we have too many static members and methods, will it cause a problem?? thanx for ur comments regards, Raghavendra Mahuli Back to top raghavendra Guest Posted: Tue Mar 02, 2004 1:01 pm    Post subject: Re: regarding static fn What i mean by vice versa.... A static method can access non static members "raghavendra" <raghavendra.ma (AT) in (DOT) bosch.com> wrote Quote: Hi , A static member can be accessed only by another static method....but the vice-versa is not true....Can anyone pls explain me the logic behind this... Also in a project, if we have too many static members and methods, will it cause a problem?? thanx for ur comments regards, Raghavendra Mahuli Back to top Leor Zolman Guest Posted: Tue Mar 02, 2004 1:33 pm    Post subject: Re: regarding static fn On Tue, 2 Mar 2004 18:31:30 +0530, "raghavendra" <raghavendra.ma (AT) in (DOT) bosch.com> wrote: Quote: What i mean by vice versa.... A static method can access non static members "raghavendra" <raghavendra.ma (AT) in (DOT) bosch.com> wrote in message news:c220b1$kpk$1 (AT) ns1 (DOT) fe.internet.bosch.com... Hi , A static member can be accessed only by another static method....but the vice-versa is not true....Can anyone pls explain me the logic behind this... Also in a project, if we have too many static members and methods, will it cause a problem?? thanx for ur comments regards, Raghavendra Mahuli A static member function cannot access non-static members using /unqualified names/, but it can if those the names are qualified (by dot (.), arrow (->) or : (in the same way those members would be accessed from code in a non-member function such as main()). The thing to remember is that unqualified names within a member function that resolve to non-static members of the same class act as if they were preceded by "this->", implying that each instantiated object of the class has its own copy of the data (or that it makes sense to call a member function that requires a "this" object to operate upon). A static member function has no "this" object, so it wouldn't make much sense for code within such a function to say something like int i = length(); meaning: int i = this->length(); if there's no implicit object to apply the length() function to. So that isn't allowed. On the other side of the coin, within a /non-static/ member function, all uses of unqualified static member names refer, by definition, to the same object...although it makes equally little sense to /qualify/ these names with . or -> or :: (well, the latter could make sense to force a non-default scope resolution), C++ allows them all just so we all have more options for creating cryptic code -leor Leor Zolman BD Software [email]leor (AT) bdsoft (DOT) com[/email] www.bdsoft.com -- On-Site Training in C/C++, Java, Perl & Unix C++ users: Download BD Software's free STL Error Message Decryptor at www.bdsoft.com/tools/stlfilt.html Back to top raghavendra Guest Posted: Thu Mar 04, 2004 5:31 am    Post subject: Re: regarding static fn Thanx leor for the info. I would also like to know why a static member can be accessed only by a STATIC member function Quote: What i mean by vice versa.... A static method can access non static members On the other side of the coin, within a /non-static/ member function, all uses of unqualified static member names refer, by definition, to the same object...although it makes equally little sense to /qualify/ these names with . or -> or :: (well, the latter could make sense to force a non-default scope resolution), C++ allows them all just so we all have more options for creating cryptic code -leor Back to top Leor Zolman Guest Posted: Thu Mar 04, 2004 2:42 pm    Post subject: Re: regarding static fn On Thu, 4 Mar 2004 11:01:01 +0530, "raghavendra" <raghavendra.ma (AT) in (DOT) bosch.com> wrote: Quote: Thanx leor for the info. I would also like to know why a static member can be accessed only by a STATIC member function But that's not the case. The only place the word "only" applies is here: a non-static member can **only** be accessed--via an /unqualified/ call--from within a member function (as I explained earlier). As the paragraph I wrote (which you quote below) says. A "non-static member function" (the OPPOSITE of a "static member function"), can access statics just fine...and regardless of what the "this" object is during such a call, any access to a static member named "x" will yield the exact same singular member whether you write the expressions as x or this->x or (*this).x or classname::x At this point, I highly suggest you just start writing some code to try out the permutations. It should then make a lot more sense (like anything in programming.) Good luck, -leor Quote: What i mean by vice versa.... A static method can access non static members On the other side of the coin, within a /non-static/ member function, all uses of unqualified static member names refer, by definition, to the same object...although it makes equally little sense to /qualify/ these names with . or -> or :: (well, the latter could make sense to force a non-default scope resolution), C++ allows them all just so we all have more options for creating cryptic code -leor Leor Zolman BD Software [email]leor (AT) bdsoft (DOT) com[/email] www.bdsoft.com -- On-Site Training in C/C++, Java, Perl & Unix C++ users: Download BD Software's free STL Error Message Decryptor at www.bdsoft.com/tools/stlfilt.html 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.