C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  How to make whole container(STL) to create in heap          C++Talk.NET Forum Index -> C++ Language (Moderated) View previous topic :: View next topic   Author Message sandeep Guest Posted: Mon Jun 05, 2006 10:52 pm    Post subject: How to make whole container(STL) to create in heap When we use STL which memory space it will use whither it is stack or heap or data segment How to make STL to create in heap? How to make whole container to create in heap? I think container uses stack is it correct ? I am using double linked list so in place of it I want to use STL #include<stdio.h> #include<iostream> #include<vector> using namespace std; void fun(); void fun1(); vector<int> root;// I want to create this in heap void main() { fun(); fun1(); } void fun1() { printf("%d\n",root[1]); } void fun() { root.push_back(55); root.push_back(66); } [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top Thomas Maeder Guest Posted: Tue Jun 06, 2006 4:30 am    Post subject: Re: How to make whole container(STL) to create in heap "sandeep" <sandeep.k (AT) incore (DOT) in> writes: Quote: When we use STL which memory space it will use whither it is stack or heap or data segment How to make STL to create in heap? How to make whole container to create in heap? I think container uses stack is it correct ? The object representing the container is wherever you place it. If it's a local variable, then it's on the stack; if you create it dynamically, it will be on the heap; and if it is defined at namespace level or as a static data member, it will be somewhere else. Where the container object places its internal data (e.g. its elements) is determined by the allocator the container template is instantiated with. The default allocator will place the internal data on the heap. Quote: I am using double linked list so in place of it I want to use STL #include<stdio.h #include<iostream #include<vector You are mixing header generations here. Consistently #including new-style headers is likely to lead to more predictible results. Quote: using namespace std; void fun(); void fun1(); vector<int> root;// I want to create this in heap root is defined at namespace level; this means that it is not on the heap. Since the default allocator is used, the array containing root's elements will be on the heap, though. If you want the vector object to be on the heap, you have to create it with a new expression. Quote: void main() The return type of main() has to be int. [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top Jeffrey Schwab Guest Posted: Tue Jun 06, 2006 4:31 am    Post subject: Re: How to make whole container(STL) to create in heap sandeep wrote: Quote: When we use STL which memory space it will use whither it is stack or heap or data segment In general, the STL uses both heap and stack space, as well as static storage. This is true even on architectures that do not support explicit heap and data segments, or any segmentation at all. Quote: How to make STL to create in heap? How to make whole container to create in heap? I think container uses stack is it correct ? The STL containers typically use a small amount of stack space, but use something called an "allocator" to allocate storage dynamically. E.g., a statement like: std::vector<int> v(1000); Will create the 1000 elements on the heap, not the stack. You can instantiate STL types using operator "new," but there is probably no need. The STL classes are already reasonably smart about where they store things. If you want fine-grained control over which heap segments/pages are used, you may want to write a custom allocator. Quote: I am using double linked list so in place of it I want to use STL #include<stdio.h #include <cstdio> Quote: #include<iostream Is there a reason you are mixing stdio and iostream? Quote: #include<vector using namespace std; void fun(); void fun1(); vector<int> root;// I want to create this in heap Why? Do you just mean that you want the ints to be allocated on the heap? Quote: void main() { fun(); fun1(); } void fun1() { printf("%d\n",root[1]); } void fun() { root.push_back(55); root.push_back(66); These statements both use heap space by default. Quote: } [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top Sheff Guest Posted: Tue Jun 06, 2006 4:32 am    Post subject: Re: How to make whole container(STL) to create in heap sandeep пиÑ�ал(а): Quote: When we use STL which memory space it will use whither it is stack or heap or data segment How to make STL to create in heap? How to make whole container to create in heap? I think container uses stack is it correct ? Hm, I think containers already allocate memory on the heap, in your situation only object itself lies on the stack, so if you want to make ALL container on the heap, then, I think, you must write something like this: vector<int>* root = new vector<int>; [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top kanze Guest Posted: Wed Jun 07, 2006 2:55 am    Post subject: Re: How to make whole container(STL) to create in heap Thomas Maeder wrote: [...] Quote: #include<stdio.h #include<iostream #include<vector You are mixing header generations here. Is he? All of the above headers are defined in the current standard. Quote: Consistently #including new-style headers is likely to lead to more predictible results. I don't think so. There are very, very few implementations where the <cxxx> versions of the C headers are conform. Using the standard C versions (e.g. <stdio.h>) gives, in practice, much more predictible results. At least in my experience. -- James Kanze GABI Software Conseils en informatique orientée objet/ Beratung in objektorientierter Datenverarbeitung 9 place Sémard, 78210 St.-Cyr-l'École, France, +33 (0)1 30 23 00 34 [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top kanze Guest Posted: Wed Jun 07, 2006 2:56 am    Post subject: Re: How to make whole container(STL) to create in heap Jeffrey Schwab wrote: Quote: I am using double linked list so in place of it I want to use STL #include<stdio.h #include <cstdio Only if you like non-conformant headers. At least at present, you're much better off sticking with the C style headers. Quote: #include<iostream Is there a reason you are mixing stdio and iostream? He doesn't, and the include here is entirely superfluous. On the other hand, I occasionally include <stdio.h>, even though I use only iostream for my IO. Where else are functions like rename, remove or tmpnam declared? (Or the macro BUFSIZ, but it's a lot less frequent to need that.) -- James Kanze GABI Software Conseils en informatique orientée objet/ Beratung in objektorientierter Datenverarbeitung 9 place Sémard, 78210 St.-Cyr-l'École, France, +33 (0)1 30 23 00 34 [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. 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