Only defined in case of

// E.g., for matrices
stride< 1() )                   // Stride for increment of index 1
stride< 2() )                   // Stride for increment of index 2
stride< tag::major() )          // Depends on data_order
stride< tag::minor() )          // Depends on data_order

// Convenience stuff
stride1(m)
stride_major(m)
stride_minor(m)