===============
Sample solution                                         [TOC]
===============

This works indeed as we can work with multiple blocks
in this case where one block represents a row of a our
matrix. This works only in cases where the elements
of a row are stored consecutively in memory, i.e. where we
have `A.incCol() == 1`:

---- CODE (type=cpp) ----------------------------------------------------------
MPI_Type_vector(
   /* count = */ A.numRows(),
   /* blocklength = */ A.numCols(),
   /* stride = */ A.incRow(),
   /* element type = */ get_type(A(0, 0)),
   /* newly created type = */ &datatype);
-------------------------------------------------------------------------------

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