[Boost-users] hash_table iterator problems

From: Martin Wartens (martin.wartens_at_[hidden])
Date: 2005-04-22 11:27:49

Hi,
I have got some problems with the unordered containers from the sandbox files. 
The problem is that iterator_base<T> can't be converted into iterator or 
const_iterator. I helped myself by adding 
"friend class const_iterator; friend class iterator;" 
to iterator_base and adding a constructor like "const_iterator
(iterator_base_type i)" to const_iterator/iterator. I have no clue if this is 
could be an official solution. See sample code below to expose the problem.
Bye, Martin

typedef boost::unordered_set<int> MySet;
{
MySet myset;
MySet::const_iterator citer = myset.begin();
MySet::iterator iter = myset.begin();
MySet::const_iterator citer2= ++citer; //doesn't work, but should (?)
MySet::iterator iter2 = ++citer; //doesn't work, and should not work (?)
MySet::iterator iter3 = ++iter; //doesn't work, but should (?)
MySet::const_iterator citer3 = iter; //works, you can't do that 
                                     //with std::containers (?)
}