Re: Pointer to container in STL

From:

red floyd <no.spam@here.dude>

Newsgroups:

comp.lang.c++

Date:

Wed, 28 Jun 2006 18:32:15 GMT

Message-ID:

<PWzog.56302$fb2.2237@newssvr27.news.prodigy.net>

Henning Hasemann wrote:

Daniel Marques wrote:

I would like to know how to get the address of a container of the STL
without using iterators. I have a class with three STL lists and a
index which points to an element of any ot the other lists, but i don't
know how to access these elements addresses.
Just as an example:
class C {
   public:
      int a;
}

int main() {
   C obj;
   obj.a=2;
   list<C> letter;
   letter.push_back(obj);
   list<C>::iterator it = letter.begin();
   // How do i know where 'it' is pointing
}

Im not sure if this is a preferable way but I whould use here:

C* c_ptr = &(*it);

Yes this looks very strange, but it should give what you want: The
physical* address of the element.

HTH,
Henning

*) Well I know in fact it is not the real physical adress but the linear
or logical one or whatever.
"Physical" here just should denote that what you get is not an
STL-iterator but a primitive pointer.

Assuming C hasn't overridden operator&, of course.

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