Hello, the snippet below doesn't compile due to a missing constructor. Changes to const std::string doesn't compile too. Is this intentionally or misuse it? How to fix it? Here the error from from clang: /opt/clang/bin/clang++ -I /home/olaf/Projects/programming/cpp/boost/trunk/ iterator_composite.cpp -o iterator_composite iterator_composite.cpp:70:36: error: no matching constructor for initialization of 'client::default_input_iterator' (aka 'boost::filter_iterator') client::default_input_iterator first( rng.begin() ); ^ ~~~~~~~~~~~ Thanks, Olaf