module my_network_module
  use athena
  use diffstruc
  implicit none

  type, extends(network_type) :: my_network_type
   contains
     procedure, pass(this) :: forward => my_forward
  end type my_network_type

contains

  subroutine my_forward(this, input)
    implicit none
    class(my_network_type), intent(inout), target :: this
    class(*), dimension(:,:), intent(in) :: input
    type(array_type), pointer :: ptr(:,:)

    ! Example forward pass implementation
    select type(input)
    class is(array_type)
       ptr => this%model(1)%layer%forward_eval(input)
       ptr => this%model(2)%layer%forward_eval(ptr)
    end select
  end subroutine my_forward

end module my_network_module