Hello, would it be possible to add a configuration macro in iterator_range.hpp like : #if !defined(BOOST_ITERATOR_RANGE_NO_IO) #include "boost/range/iterator_range_io.hpp" #endif so that custom versions of the insertion operator for iterator_range won't clash with the one provided by boost ? We could include only the core include (iterator_range_core.hpp) but other boost libraries seems to include iterator_range.hpp which include the io header... Samuel