Boost QVM

diag_m

#include <boost/qvm/map_vm.hpp>

namespace boost
{
    namespace qvm
    {
        //Only enabled if: is_v<A>::value
        template <iclass A>
        -unspecified-return-type- diag_m( A & a );
    }
}

The expression diag_m(v) returns a view proxy that accesses the vector v as a square matrix of the same dimensions in which the elements of v appear as the main diagonal and all other elements are zero.

See also: boost/qvm/map_vm.hpp