Hi, I'm trying to transparently get the type of a shared_ptr or a pod pointer using iterator_traits::value_type. This fails on shared_ptr<T> with the following message: /usr/lib/gcc/x86_64-redhat-linux/4.1.2/../../../../include/c++/4.1.2/bits/stl_iterator_base_types.h: In instantiation of 'std::iterator_traits<boost::shared_ptr<int> >': crap.cc:5: instantiated from here /usr/lib/gcc/x86_64-redhat-linux/4.1.2/../../../../include/c++/4.1.2/bits/stl_iterator_base_types.h:129: error: no type named 'iterator_category' in 'class boost::shared_ptr<int>' /usr/lib/gcc/x86_64-redhat-linux/4.1.2/../../../../include/c++/4.1.2/bits/stl_iterator_base_types.h:131: error: no type named 'difference_type' in 'class boost::shared_ptr<int>' It seems shared_ptr needs difference_type and iterator_category for this to work. Is there another way to accomplish what I'm trying to do? Regards, /Patrik