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! Program to test the ASSOCIATED intrinsic.
program intrinsic_associated
call pointer_to_section ()
call associate_1 ()
call pointer_to_derived_1 ()
call associated_2 ()
end
subroutine pointer_to_section ()
integer, dimension(5, 5), target :: xy
integer, dimension(:, :), pointer :: window
data xy /25*0/
logical t
window => xy(2:4, 3:4)
window = 10
window (1, 1) = 0101
window (3, 2) = 4161
window (3, 1) = 4101
window (1, 2) = 0161
t = associated (window, xy(2:4, 3:4))
if (.not.t) STOP 1
! Check that none of the array got mangled
if ((xy(2, 3) .ne. 0101) .or. (xy (4, 4) .ne. 4161) &
.or. (xy(4, 3) .ne. 4101) .or. (xy (2, 4) .ne. 0161)) STOP 2
if (any (xy(:, 1:2) .ne. 0)) STOP 3
if (any (xy(:, 5) .ne. 0)) STOP 4
if (any (xy (1, 3:4) .ne. 0)) STOP 5
if (any (xy (5, 3:4) .ne. 0)) STOP 6
if (xy(3, 3) .ne. 10) STOP 7
if (xy(3, 4) .ne. 10) STOP 8
if (any (xy(2:4, 3:4) .ne. window)) STOP 9
end
subroutine sub1 (a, ap)
integer, pointer :: ap(:, :)
integer, target :: a(10, 10)
ap => a
end
subroutine nullify_pp (a)
integer, pointer :: a(:, :)
if (.not. associated (a)) STOP 10
nullify (a)
end
subroutine associate_1 ()
integer, pointer :: a(:, :), b(:, :)
interface
subroutine nullify_pp (a)
integer, pointer :: a(:, :)
end subroutine nullify_pp
end interface
allocate (a(80, 80))
b => a
if (.not. associated(a)) STOP 11
if (.not. associated(b)) STOP 12
call nullify_pp (a)
if (associated (a)) STOP 13
if (.not. associated (b)) STOP 14
end
subroutine pointer_to_derived_1 ()
type record
integer :: value
type(record), pointer :: rp
end type record
type record1
integer value
type(record2), pointer :: r1p
end type
type record2
integer value
type(record1), pointer :: r2p
end type
type(record), target :: e1, e2, e3
type(record1), target :: r1
type(record2), target :: r2
nullify (r1%r1p, r2%r2p, e1%rp, e2%rp, e3%rp)
if (associated (r1%r1p)) STOP 15
if (associated (r2%r2p)) STOP 16
if (associated (e2%rp)) STOP 17
if (associated (e1%rp)) STOP 18
if (associated (e3%rp)) STOP 19
r1%r1p => r2
r2%r2p => r1
r1%value = 11
r2%value = 22
e1%rp => e2
e2%rp => e3
e1%value = 33
e1%rp%value = 44
e1%rp%rp%value = 55
if (.not. associated (r1%r1p)) STOP 20
if (.not. associated (r2%r2p)) STOP 21
if (.not. associated (e1%rp)) STOP 22
if (.not. associated (e2%rp)) STOP 23
if (associated (e3%rp)) STOP 24
if (r1%r1p%value .ne. 22) STOP 25
if (r2%r2p%value .ne. 11) STOP 26
if (e1%value .ne. 33) STOP 27
if (e2%value .ne. 44) STOP 28
if (e3%value .ne. 55) STOP 29
if (r1%value .ne. 11) STOP 30
if (r2%value .ne. 22) STOP 31
end
subroutine associated_2 ()
integer, pointer :: xp(:, :)
integer, target :: x(10, 10)
integer, target :: y(100, 100)
interface
subroutine sub1 (a, ap)
integer, pointer :: ap(:, :)
integer, target :: a(10, 10)
end
endinterface
xp => y
if (.not. associated (xp)) STOP 32
call sub1 (x, xp)
if (associated (xp, y)) STOP 33
if (.not. associated (xp, x)) STOP 34
end
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