Re: list::begin() iterator comportement after push_back operations

Hi there,

I have a problem with the begin iterator of STL Lists.
Indeed, if we keep the begin iterator of an empty list when we test
it after multiple push_back operations it becomes the end iterator.
Here is my code:

-------------------------------------------
#include <iostream>
using std::cout;
using std::endl;
using std::boolalpha;

#include <list>
using std::list;

int main(int argc, char * argv[])
{
list<int> l;
list<int>::const_iterator it = l.begin();
list<int>::const_reverse_iterator rit = l.rbegin();

l.push_back(1);
l.push_back(2);

cout << boolalpha << (it == l.end()) << endl;
cout << boolalpha << (rit == l.rend()) << endl;

return 0;
}
-------------------------------------------

It actually returns:
true
false

with gcc version 4.3.4 (Gentoo 4.3.4 p1.0, pie-10.1.5)

Is it possible to keep in memory the begin iterator of a list (not
using reverse iterators) which will really point to the begin of the
list after push_back operations on the list (obviously I am not able
to use l.begin() after (because it is an initial state in my
algorithm and I then update the iterator that pointed to the begin
iterator initialy))

Thanks for your help.