diff --git a/include/boost/pending/iterator_adaptors.hpp b/include/boost/pending/iterator_adaptors.hpp
index dddd457..996c510 100644
--- a/include/boost/pending/iterator_adaptors.hpp
+++ b/include/boost/pending/iterator_adaptors.hpp
@@ -174,10 +174,11 @@ public:
     typedef typename Traits::pointer pointer;
     typedef typename Traits::reference reference;
     typedef typename Traits::iterator_category iterator_category;
+    typedef Iterator iterator_type;
 
     iterator_adaptor() { }
 
-    iterator_adaptor(const Iterator& iter, const Policies& p = Policies())
+    iterator_adaptor(const iterator_type& iter, const Policies& p = Policies())
         : m_iter_p(iter, p) {}
 
 #ifdef BOOST_MSVC6_MEMBER_TEMPLATES
@@ -249,6 +250,8 @@ public:
         return *this;
     }
 
+    iterator_type base() const { return m_iter_p.first(); }
+
 private:
     typedef Policies policies_type;
     compressed_pair<Iterator,Policies> m_iter_p;