 [i])      template<class E>      BOOST_UBLAS_INLINE      typename vector_unary_traits<E, scalar_abs<typename E::value_type> >::result_type      abs (const vector_expression<E> &e) {          typedef typename vector_unary_traits<E, scalar_abs<typename E::value_type> >::expression_type expression_type;          return expression_type (e ());      }        