Using 1.28.0, in source file "boost/tuple/detail/tuple_basic_no_partial_spec.hpp" (line 651), notice the transposition of <T5> and <T6>: return make_tuple(detail::assign_to_pointee<T1>(&t1), detail::assign_to_pointee<T2>(&t2), detail::assign_to_pointee<T3>(&t3), detail::assign_to_pointee<T4>(&t4), detail::assign_to_pointee<T6>(&t5), <---- detail::assign_to_pointee<T5>(&t6)); <---- Looks like a typo? Thanks, - Marsh