12 template<typename T> struct traits  struct
14     typedef T Scalar;
16     typedef typename vector_traits<T>::vector Vector;
683 struct traits<_Expr<DerivedOp>>  struct
685     typedef typename traits<DerivedOp>::Scalar Scalar;
687     typedef typename traits<DerivedOp>::Vector Vector;
692 struct traits<_Binary<LHS,RHS,DerivedOp>>  struct
694     typedef typename traits<LHS>::Scalar Scalar;
696     typedef typename traits<LHS>::Vector Vector;
851 struct traits<_Unary<LHS,DerivedOp>>  struct
853     typedef typename traits<LHS>::Scalar Scalar;
855     typedef typename traits<LHS>::Vector Vector;