65 lines
1.4 KiB
Fortran
65 lines
1.4 KiB
Fortran
! { dg-do run }
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!
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! PR39630: Fortran 2003: Procedure pointer components.
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!
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! test case taken from:
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! http://groups.google.com/group/comp.lang.fortran/browse_thread/thread/4a827e8ced6efb0f/884b9eca6d7e6742?#884b9eca6d7e6742
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! http://fortranwiki.org/fortran/show/proc_component_example
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module proc_component_example
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type t
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real :: a
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procedure(print_int), pointer, &
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nopass :: proc
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end type t
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abstract interface
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subroutine print_int (arg, lun)
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import
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type(t), intent(in) :: arg
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integer, intent(in) :: lun
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end subroutine print_int
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end interface
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integer :: calls = 0
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contains
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subroutine print_me (arg, lun)
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type(t), intent(in) :: arg
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integer, intent(in) :: lun
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write (lun,*) arg%a
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calls = calls + 1
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end subroutine print_me
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subroutine print_my_square (arg, lun)
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type(t), intent(in) :: arg
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integer, intent(in) :: lun
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write (lun,*) arg%a**2
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calls = calls + 1
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end subroutine print_my_square
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end module proc_component_example
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program main
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use proc_component_example
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use iso_fortran_env, only : output_unit
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type(t) :: x
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x%a = 2.71828
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x%proc => print_me
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call x%proc(x, output_unit)
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x%proc => print_my_square
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call x%proc(x, output_unit)
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if (calls/=2) call abort
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end program main
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! { dg-final { cleanup-modules "proc_component_example" } }
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