gcc/testsuite/gfortran.dg/proc_ptr_1.f90

   1 ! { dg-do run }
   2 !
   3 ! basic tests of PROCEDURE POINTERS
   4 !
   5 ! Contributed by Janus Weil <janus@gcc.gnu.org>
   6
   7 module m
   8 contains
   9   subroutine proc1(arg)
  10     character (5) :: arg
  11     arg = "proc1"
  12   end subroutine
  13   integer function proc2(arg)
  14     integer, intent(in) :: arg
  15     proc2 = arg**2
  16   end function
  17   complex function proc3(re, im)
  18     real, intent(in) :: re, im
  19     proc3 = complex (re, im)
  20   end function
  21 end module
  22
  23 subroutine foo1
  24 end subroutine
  25
  26 real function foo2()
  27   foo2=6.3
  28 end function
  29
  30 program procPtrTest
  31   use m, only: proc1, proc2, proc3
  32   character (5) :: str
  33   PROCEDURE(proc1), POINTER :: ptr1
  34   PROCEDURE(proc2), POINTER :: ptr2
  35   PROCEDURE(proc3), POINTER :: ptr3 => NULL()
  36   PROCEDURE(REAL), SAVE, POINTER :: ptr4
  37   PROCEDURE(), POINTER :: ptr5,ptr6
  38
  39   EXTERNAL :: foo1,foo2
  40   real :: foo2
  41
  42   if(ASSOCIATED(ptr3)) call abort()
  43
  44   NULLIFY(ptr1)
  45   if (ASSOCIATED(ptr1)) call abort()
  46   ptr1 => proc1
  47   if (.not. ASSOCIATED(ptr1)) call abort()
  48   call ptr1 (str)
  49   if (str .ne. "proc1") call abort ()
  50
  51   ptr2 => NULL()
  52   if (ASSOCIATED(ptr2)) call abort()
  53   ptr2 => proc2
  54   if (.not. ASSOCIATED(ptr2,proc2)) call abort()
  55   if (10*ptr2 (10) .ne. 1000) call abort ()
  56
  57   ptr3 => NULL (ptr3)
  58   if (ASSOCIATED(ptr3)) call abort()
  59   ptr3 => proc3
  60   if (ptr3 (1.0, 2.0) .ne. (1.0, 2.0)) call abort ()
  61
  62   ptr4 => cos
  63   if (ptr4(0.0)/=1.0) call abort()
  64
  65   ptr5 => foo1
  66   call ptr5()
  67
  68   ptr6 => foo2
  69   if (ptr6()/=6.3) call abort()
  70
  71 end program