Hello, For the following code: #include <vector> #include <boost/range/adaptor/transformed.hpp> #include <boost/range/join.hpp> using boost::adaptors::transformed; using boost::join; int add1(int i) { return i + 1; } int main() { std::vector<int> A, B; auto joined = join(A | transformed(add1), B); } I get the following compiler errors: In file included from ../shared/test/test.cpp:3:0: ../../lib/boost/boost/range/join.hpp: In instantiation of 'boost::range_detail ::joined_type< const boost::range_detail::transformed_range<int (*)(int), vector<int> >, const vector<int> >': ../../lib/boost/boost/range/join.hpp:40:7: instantiated from 'boost ::joined_range< const boost::range_detail::transformed_range<int (*)(int), vector<int> >, const vector<int> >' ../shared/test/test.cpp:13:48: instantiated from here ../../lib/boost/boost/range/join.hpp:34:7: error: no type named 'type' in 'boost::range_detail::demote_iterator_traversal_tag< boost::detail::iterator_category_with_traversal< input_iterator_tag, boost::random_access_traversal_tag >, boost::random_access_traversal_tag >' ../../lib/boost/boost/range/join.hpp: In instantiation of 'boost::joined_range< const boost::range_detail::transformed_range<int (*)(int), vector<int> >, const vector<int> >': ../shared/test/test.cpp:13:48: instantiated from here ../../lib/boost/boost/range/join.hpp:47:11: error: no type named 'type' in 'boost::range_detail::demote_iterator_traversal_tag< boost::detail::iterator_category_with_traversal< input_iterator_tag, boost::random_access_traversal_tag >, boost::random_access_traversal_tag >' What is going on? Thanks, Nate.