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! { 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
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