Expression of the reverse of a vector or matrix.
| MatrixType | the type of the object of which we are taking the reverse | 
| Direction | defines the direction of the reverse operation, can be Vertical, Horizontal, or BothDirections | 
This class represents an expression of the reverse of a vector. It is the return type of MatrixBase::reverse() and VectorwiseOp::reverse() and most of the time this is the only way it is used.
Inherits internal::dense_xpr_base::type.
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    https://eigen.tuxfamily.org/dox/classEigen_1_1Reverse.html