Clicky
This example was posted to comp.lang.fortran by "Simulate" on December 12, 2008.
module proc_component_example
type t
real :: a
procedure(print_int), pointer, nopass :: proc
end type t
abstract interface
subroutine print_int (arg, lun)
import
type(t), intent(in) :: arg
integer, intent(in) :: lun
end subroutine print_int
end interface
contains
subroutine print_me (arg, lun)
type(t), intent(in) :: arg
integer, intent(in) :: lun
write (lun,*) arg%a
end subroutine print_me
subroutine print_my_square (arg, lun)
type(t), intent(in) :: arg
integer, intent(in) :: lun
write (lun,*) arg%a**2
end subroutine print_my_square
end module proc_component_example
program main
use proc_component_example
use iso_fortran_env, only : output_unit
type(t) :: x
x%a = 2.71828
x%proc => print_me
call x%proc(x, output_unit)
x%proc => print_my_square
call x%proc(x, output_unit)
end program main