358 struct _Binary: _Expr<_Binary<LHS,RHS,DerivedOp>>  struct
360     using Scalar = typename traits<LHS>::Scalar;
362     using Vector = typename traits<LHS>::Vector;
364     _Binary(const LHS &lhs,  in _Binary()  argument
371     _Binary(const _Binary &other):  in _Binary()  argument
378     _Binary(_Binary &&other):   in _Binary()  argument
385     vector_length_t length() const {  in length()
391     vector_length_t length() const {  in length()
397     vector_length_t rows() const {  in rows()
403     vector_length_t rows() const {  in rows()
409     vector_length_t columns() const {  in columns()
415     vector_length_t columns() const {  in columns()
425     Scalar const operator[](const index_t i) const {  in operator []()
446     Scalar const operator()(const index_t r,const index_t c) const  in operator ()()
473     Vector const vector_op(const index_t i) const  in vector_op()
540     Vector const matrix_op(const index_t r,const index_t c) const  in matrix_op()
595     const LHS lhs_;
596     const RHS rhs_;
597     const _BinaryOperator<Scalar,DerivedOp> op_;