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Hi,

I am trying to get the iterator that points to the last element of a
deque.
However, the following program is incorrect:

#include <deque>
#include <iostream>
using namespace std;

int main()
{
deque<int> queue;
deque<int>::iterator it;

queue.clear();
queue.push_back(5);
it = queue.rbegin().base();

cout<<"*it = "<<*it<<endl;
return 0;
}

How can I get a correct one?
Thanks a lot!

Andy

well, it = (queue.rbegin() + 1).base() will work.
andy

Andy wrote:
> I am trying to get the iterator that points to the last element of a
> deque.

/**/ std::deque<int> queue;
/**/ queue.push_back(5);
/**/ std::deque<int>::iterator it = queue.end() - 1;
--
<private.php?do=newpm&u=> <http://www.dietmar-kuehl.de/>
<http://www.contendix.com> - Software Development & Consulting

On 2005-02-01 09:39:31 -0500, "Andy" <> said:

> well, it = (queue.rbegin() + 1).base() will work.
> andy

Why even bother with reverse iterators? Why not just use:

it = queue.end() - 1;

--
Clark S. Cox, III

Andy wrote:
> Hi,
>
> I am trying to get the iterator that points to the last element of a
> deque.
> However, the following program is incorrect:
>
> #include <deque>
> #include <iostream>
> using namespace std;
>
> int main()
> {
> deque<int> queue;
> deque<int>::iterator it;
>
> queue.clear();
> queue.push_back(5);
> it = queue.rbegin().base();
>
> cout<<"*it = "<<*it<<endl;
> return 0;
> }
>
> How can I get a correct one?
> Thanks a lot!
>
> Andy
>

Hi,

base() returns an iterator one beyond the element pointed to by the
corresponding reverse_iterator so you need

it = --(queue.rbegin().base());

instead.

/Andreas