Hi, When using boost::strided I get the following error: boost/range/adaptor/strided.hpp:52: error: unused parameter 'first' The following patch should fix this error. Cheers, Shaun --- boost/range/adaptor/strided.hpp (revision 75052) +++ boost/range/adaptor/strided.hpp (working copy) @@ -49,7 +49,7 @@ namespace boost { } - strided_iterator(base_iterator first, base_iterator it, base_iterator last, difference_type stride) + strided_iterator(base_iterator, base_iterator it, base_iterator last, difference_type stride) : super_t(it) , m_last(last) , m_stride(stride)