C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  vectors stl with pointers          C++Talk.NET Forum Index -> C++ language (comp.lang.c++) View previous topic :: View next topic   Author Message berthelot samuel Guest Posted: Wed Jul 30, 2003 8:46 am    Post subject: vectors stl with pointers hi all, I have a simple question. I use a stl vector of pointers on objects of my own class, say Person: vector<Person*> vectPerson; vectPerson.push_back(new Person("Sam")); when I call vectPerson.pop_back, do i need to take care of the pointer by calling delete or does the pop method handle this for me ? thx Sam Back to top Patrik Stellmann Guest Posted: Wed Jul 30, 2003 9:22 am    Post subject: Re: vectors stl with pointers Quote: when I call vectPerson.pop_back, do i need to take care of the pointer by calling delete or does the pop method handle this for me ? you will have to delete it on your own! Back to top Peter van Merkerk Guest Posted: Wed Jul 30, 2003 9:22 am    Post subject: Re: vectors stl with pointers "berthelot samuel" <samuel.berthelot (AT) voila (DOT) fr> wrote: Quote: I have a simple question. I use a stl vector of pointers on objects of my own class, say Person: vector<Person*> vectPerson; vectPerson.push_back(new Person("Sam")); when I call vectPerson.pop_back, do i need to take care of the pointer by calling delete or does the pop method handle this for me ? No, you will have to do it yourself. The pop methods just remove the pointer from the vector. The std::vector class cannot know if it has to delete the object that is being referenced by the pointer; depending on the situation it may or may not be the appropriate thing to do. Rather than using raw pointers, you may also opt for putting boost::shared_ptr of the boost library (http://www.boost.org/) in the vector. This way you don't have to worry about ownership issues. -- Peter van Merkerk peter.van.merkerk(at)dse.nl Back to top John Harrison Guest Posted: Wed Jul 30, 2003 12:01 pm    Post subject: Re: vectors stl with pointers "berthelot samuel" <samuel.berthelot (AT) voila (DOT) fr> wrote Quote: hi all, I have a simple question. I use a stl vector of pointers on objects of my own class, say Person: vector<Person*> vectPerson; vectPerson.push_back(new Person("Sam")); when I call vectPerson.pop_back, do i need to take care of the pointer by calling delete or does the pop method handle this for me ? thx Sam No you have to do it one your own, also you have to keep track of copies of your vector. This is why you shouldn't use raw pointers in an STL class (or anywhere similar). Do yourself a favour and learn about smart pointers, will save you months of debugging tricky pointer problems. Have a look at the smart_ptr class from www.boost.org for instance, or get a good book. john 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.