Subversion Repositories openrisc

! { dg-do compile }

module m1

  implicit none

  type, abstract :: vector_class

  end type vector_class

end module m1

!---------------------------------------------------------------

module m2

  use m1

  implicit none

  type, abstract :: inner_product_class

  contains

    procedure(dot), deferred :: dot_v_v

    procedure(dot), deferred :: dot_g_g

    procedure(sub), deferred :: D_times_v

    procedure(sub), deferred :: D_times_g

  end type inner_product_class

  abstract interface

    function dot (this,a,b)

      import :: inner_product_class

      import :: vector_class

      class(inner_product_class), intent(in) :: this

      class(vector_class),        intent(in) :: a,b

      real                                   :: dot

    end function

    subroutine sub (this,a)

      import :: inner_product_class

      import :: vector_class

      class(inner_product_class), intent(in)    :: this

      class(vector_class),        intent(inout) :: a

    end subroutine

  end interface

end module m2

!---------------------------------------------------------------

module m3

  use :: m1

  use :: m2

  implicit none

  private

  public :: gradient_class

  type, abstract, extends(vector_class) :: gradient_class

    class(inner_product_class), pointer :: my_inner_product => NULL()

  contains

    procedure, non_overridable  :: inquire_inner_product

    procedure(op_g_v), deferred :: to_vector

  end type gradient_class

  abstract interface

    subroutine op_g_v(this,v)

      import vector_class

      import gradient_class

      class(gradient_class), intent(in)    :: this

      class(vector_class),   intent(inout) :: v

    end subroutine

  end interface

contains

  function inquire_inner_product (this)

    class(gradient_class)               :: this

    class(inner_product_class), pointer :: inquire_inner_product

    inquire_inner_product => this%my_inner_product

  end function inquire_inner_product

end module m3

!---------------------------------------------------------------

module m4

  use m3

  use m2

  implicit none

contains

  subroutine cg (g_initial)

    class(gradient_class),  intent(in)    :: g_initial

    class(inner_product_class), pointer   :: ip_save

    ip_save => g_initial%inquire_inner_product()

  end subroutine cg

end module m4

! { dg-final { cleanup-modules "m1 m2 m3 m4" } }