Sorry to keep replying to myself.
To fix this I chaged:
return const_iterator(bucket_type::s_iterator_to(priv_value_to_node(const_cast<reference>(value))), this);
to:
return const_iterator(bucket_type::s_iterator_to(const_cast<node &>(priv_value_to_node(value))), this);
in file
boost/intrusive/hashtable.hpp:
(near line 1682 in version 1_38_0)
The original code appears to be trying to call the non-const version of priv_value_to_node() by casting away the constness of the value parameter, but it doesn't work because the 'this' pointer is still const.
So, the const version of priv_value_to_node() is called instead, returning a const reference.
That const reference is passed to the const version of bucket_type::s_iterator_to(), which returns a const bucket (slist) iterator.
Finally, a const_iterator is constructed from the const bucket iterator, but there is no constructor to support this.
The lack of supporting iterator constructor seems to be by-design, because the iterator's internal slist_it_ is always non const.
Either casting away the constness of the this this pointer when calling priv_value_to_node(), or casting away the constness of the returned node reference will fix the problem.
I added a const_cast to the return from priv_value_to_node() and got rid of the const_cast on the input value reference (no longer necessary).
Thanks,
Paul Rose