how to combine multiple matrices to form one matrix

I have just started to use MTL.

I would like to combine 4 matrices A,B,C,D, to form 1 matrix G of size 5x5

typedef matrix<double, rectangle<>, dense<>, row_major>::type Matrix;
Matrix A (3,3)
Matrix B (3,2)
Matrix C (2,3)
Matrix D (2,2)

G = | A B |
      | C  D|

Is there any other way other than assigning individual component of G Matrix
iteratively.

thank you,
Nathan

_______________________________________________
This list is archived at http://www.osl.iu.edu/MailArchives/mtl-devel/