43         struct begin_impl<vector_tag,void,void>  struct
53             static typename ExprT::iterator apply(ExprT& e)  in apply()
68             static typename ExprT::const_iterator apply(ExprT const& e)  in apply()
78         struct begin_impl<matrix_tag,tag::major,row_major_tag>  struct
89             static typename ExprT::iterator1 apply(ExprT& e)  in apply()
104             static typename ExprT::const_iterator1 apply(ExprT const& e)  in apply()
114         struct begin_impl<matrix_tag,tag::major,column_major_tag>  struct
125             static typename ExprT::iterator2 apply(ExprT& e)  in apply()
140             static typename ExprT::const_iterator2 apply(ExprT const& e)  in apply()
150         struct begin_impl<matrix_tag,tag::minor,row_major_tag>  struct
161             static typename ExprT::iterator2 apply(ExprT& e)  in apply()
176             static typename ExprT::const_iterator2 apply(ExprT const& e)  in apply()
187         struct begin_impl<matrix_tag,tag::minor,column_major_tag>  struct
198             static typename ExprT::iterator1 apply(ExprT& e)  in apply()
213             static typename ExprT::const_iterator1 apply(ExprT const& e)  in apply()