[boost] Problem with boost::iterator_value

Hi, The following code does not compile under vc7.0-stlport-4.6.2: struct foo {}; typedef std::vector<int> vector_int; typedef std::vector<foo> vector_foo; BOOST_STATIC_ASSERT(( boost::is_same< int, boost::iterator_value<vector_int::iterator>::type>:: value)); BOOST_STATIC_ASSERT(( boost::is_same< foo, boost::iterator_value<vector_foo::iterator>::type>:: value)); Obviously, neither of these assertions should fail, but the second one does. I'm guessing that this is a problem with boost::iterator_value. Does anyone know how to fix this? Thanks, Alex