C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Default Member Functions          C++Talk.NET Forum Index -> C++ language (comp.lang.c++) View previous topic :: View next topic   Author Message Morris Guest Posted: Thu Jun 24, 2004 6:31 am    Post subject: Default Member Functions I have a question. How many functions are defined by default when you define a class. I was aware of four functions: Constructor Destructor Assignment Operator Copy Contructor I over heard somewhere that there are six functions by default in a class. Can anyone please tell me what are the other two default functions in a class. Regards, morris Back to top cyper Guest Posted: Thu Jun 24, 2004 7:17 am    Post subject: Re: Default Member Functions "Morris" <lattice (AT) flashmail (DOT) com> ???? news:3e2b79b0.0406232231.6f8169ab (AT) posting (DOT) google.com... Quote: I have a question. How many functions are defined by default when you define a class. I was aware of four functions: Constructor Destructor Assignment Operator this one isn't always needed. when it isn't exist.they would auto call copy construtor Quote: Copy Contructor I over heard somewhere that there are six functions by default in a class. Can anyone please tell me what are the other two default functions in a class. Regards, morris Back to top Karl Heinz Buchegger Guest Posted: Thu Jun 24, 2004 8:18 am    Post subject: Re: Default Member Functions cyper wrote: Quote: "Morris" <lattice (AT) flashmail (DOT) com> ???? news:3e2b79b0.0406232231.6f8169ab (AT) posting (DOT) google.com... I have a question. How many functions are defined by default when you define a class. I was aware of four functions: Constructor Destructor Assignment Operator this one isn't always needed. when it isn't exist.they would auto call copy construtor Not sure what you mean with that, your english is very hard to understand. But in any case it sounds wrong. operator= and copy constructor do different things. The compiler will never (and can't do it) substitute operator= with a call to the copy constructor or vice versa. If it needs an operator= there has to be one, or the compiler emits an error. -- Karl Heinz Buchegger [email]kbuchegg (AT) gascad (DOT) at[/email] Back to top Sree Guest Posted: Thu Jun 24, 2004 11:15 am    Post subject: Re: Default Member Functions Also, it is doubtfull, that the compiler offers you a default constructor and destructor, you need to explicitly put that in your code. There are wizards in IDEs which will help you in this, but that is offtopic here. -- Use our news server 'news.foorum.com' from anywhere. More details at: http://nnrpinfo.go.foorum.com/ Back to top Howard Guest Posted: Thu Jun 24, 2004 6:55 pm    Post subject: Re: Default Member Functions "Sree" <no_spam_please (AT) f-m (DOT) fm> wrote Quote: Also, it is doubtfull, that the compiler offers you a default constructor and destructor, you need to explicitly put that in your code. There are wizards in IDEs which will help you in this, but that is offtopic here. -- I think you're misunderstanding. The "default" constructor and/or destructor are created if needed, but they are not created as source code that gets inserted in your .cpp file. They are created in the resulting object code, however. Suppose, for example, that your class contained and instance of another class. The constructor for that contained class has to be called, and that's done via the default constructor that's created for your class (assuming you haven't provided one). -Howard Back to top Prateek R Karandikar Guest Posted: Thu Jun 24, 2004 11:38 pm    Post subject: Re: Default Member Functions [email]lattice (AT) flashmail (DOT) com[/email] (Morris) wrote in message news:<3e2b79b0.0406232231.6f8169ab (AT) posting (DOT) google.com>... Quote: I have a question. How many functions are defined by default when you define a class. I was aware of four functions: Constructor Destructor Assignment Operator Copy Contructor I over heard somewhere that there are six functions by default in a class. Can anyone please tell me what are the other two default functions in a class. Regards, morris The other 2 are the unary & and the comma operator. Note that only the in-built or compiler-generated comma has the sequence point, not any user-defined ones. -- -- Abstraction is selective ignorance. -Andrew Koenig -- -- Back to top Morris Guest Posted: Sun Jun 27, 2004 1:44 pm    Post subject: Re: Default Member Functions [email]kprateek88 (AT) yahoo (DOT) com[/email] (Prateek R Karandikar) wrote in message Quote: Can anyone please tell me what are the other two default functions in a class. Regards, morris The other 2 are the unary & and the comma operator. Note that only the in-built or compiler-generated comma has the sequence point, not any user-defined ones. Thanx for the answer. Can someone please provide me pointer to some text(preferably electronic) where I can get more info on the same. Or some section of Stroustrup's book which gives info regarding the same. Regards, morris Quote: -- -- Abstraction is selective ignorance. -Andrew Koenig -- -- 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.