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module class_50_m_1
private
type, public, abstract :: Addition
contains
procedure(addto), deferred :: addto
end type Addition
abstract interface
subroutine addto(self,a)
import
class(Addition), intent(in) :: self
integer, intent(inout) :: a
end subroutine addto
end interface
end module class_50_m_1
module class_50_m_2
use class_50_m_1, only: Addition
private
type, public, extends(Addition) :: AdderClass
contains
procedure :: addto
end type AdderClass
contains
subroutine addto(self,a)
class(AdderClass), intent(in) :: self
integer, intent(inout) :: a
a = a + 3
end subroutine addto
end module class_50_m_2
program class_50
use class_50_m_1, only: Addition
use class_50_m_2, only: AdderClass
integer :: a
class(Addition), allocatable :: adder
a = 1
adder = AdderClass()
call adder%addto(a)
if (a /= 4) error stop
end program class_50
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