Dear Josef. Thanks.
URL is very usefull.
Thanks .
"Joseph A. Marrero" <[EMAIL PROTECTED]> wrote:
--- John Matthews wrote:
> Hi- first of all, I'm saving up for one of the good C++
> books. Until
> then, I hope you won't mind me asking some beginners' C++
> questions.
>
> In some C code I've written previously, I have a home
> made generic
> list type which is told how big list items are. So
> list_add()
> allocates enough memory for a new item and returns a
> pointer to it, so
> that the caller can set the item's value. Eg. (in C,
> simple code to
> attempt to demonstrate my point)
>
> typedef struct
> {
> int value;
> } Item;
>
> int main(void)
> {
> List items;
> Item *item_p;
> /* Initialise the list. */
> list_init(&items, sizeof *item_p);
> /* Add (uninitialised) item to end of list. */
> item_p = list_add(&items);
> /* Initialise the new item in the list. */
> item_p->value = 3;
>
> Now if I am using STL, this is currently my attempt at
> the above:
>
> class Item
> {
> public:
> Item(int v) { value = v; }
> int value;
> };
>
> int main()
> {
> list items;
> Item item(3);
> items.push_back(item);
>
> What bothers me slightly is that in the C version, there
> is only one
> Item - it is created by list_add(), and referenced by a
> pointer.
>
> However, in my C++ version, there are 2 items (as I
> understand it) -
> the local variable item, which is initialised and passed
> to
> push_back() to create a copy of it in the list.
Hi John. You may find the following URLs helpful:
http://www.robthebloke.org/cppdir/StandardTemplateLibrary.htm
http://www.robthebloke.org/
>
> If this is the right and proper way to do it, then fine.
> But I suspect
> I'm probably missing something.
>
> Any help appreciated. I've done some Googling for STL but
> not been too
> impressed by what I've found so far - if anyone knows of
> a good online
> STL resource then that would also be gratefully received.
>
> BTW I'm working in Linux with g++ on the command line.
>
> Cheers
> John
>
>
_________________
Joseph A. Marrero
http://www.l33tprogrammer.com/
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