Create an instance of an matrix adapter
imtx<T> mtx_adapter<T>( C& src );
A reference to an object of type C which is a two-dimensional container for T, and does not support the imtx<T> interface.
An instance of an adapter class that supports the imtx<T> interface.
This template function creates an instance of a adapter derived from imtx<T> to read the specified matrix of type C.
The template function must be implemented for each matrix adapter class; it is called by the XLL+ code generated for reading matrix arguments.