#включите <boost/qvm/mat_index.hpp>include <boost/qvm/mat_index.hpp>[ORIG_END] -->

namespace boost
{
    namespace qvm
    {
        //Only enabled if:
        //  is_mat<A>::value
        template <class A>
        typename mat_traits<A>::scalar_type
        mat_index_read( A const & a, int r, int c );        
        
        //Only enabled if:
        //  is_mat<A>::value
        template <class A>
        typename mat_traits<A>::scalar_type &
        mat_index_write( A & a, int r, int c );
    }
}