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1 ! { dg-do run }
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131
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2 ! { dg-options "-std=f2008 " }
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3
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4 ! PR fortran/45197
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5 ! Check that IMPURE and IMPURE ELEMENTAL in particular works.
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6
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7 ! Contributed by Daniel Kraft, d@domob.eu.
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8
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9 MODULE m
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10 IMPLICIT NONE
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11
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12 INTEGER, PARAMETER :: n = 5
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13
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14 INTEGER :: i
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15 INTEGER :: arr(n)
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16
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17 CONTAINS
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18
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19 ! This ought to work (without any effect).
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20 IMPURE SUBROUTINE foobar ()
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21 END SUBROUTINE foobar
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22
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23 IMPURE ELEMENTAL SUBROUTINE impureSub (a)
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24 INTEGER, INTENT(IN) :: a
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25
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26 arr(i) = a
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27 i = i + 1
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28
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29 PRINT *, a
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30 END SUBROUTINE impureSub
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31
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32 END MODULE m
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33
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34 PROGRAM main
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35 USE :: m
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36 IMPLICIT NONE
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37
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38 INTEGER :: a(n), b(n), s
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39
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40 a = (/ (i, i = 1, n) /)
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41
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42 ! Traverse in forward order.
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43 s = 0
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44 b = accumulate (a, s)
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45 IF (ANY (b /= (/ 1, 3, 6, 10, 15 /))) STOP 1
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46
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47 ! And now backward.
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48 s = 0
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49 b = accumulate (a(n:1:-1), s)
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50 IF (ANY (b /= (/ 5, 9, 12, 14, 15 /))) STOP 2
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51
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52 ! Use subroutine.
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53 i = 1
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54 arr = 0
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55 CALL impureSub (a)
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56 IF (ANY (arr /= a)) STOP 3
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57
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58 CONTAINS
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59
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60 IMPURE ELEMENTAL FUNCTION accumulate (a, s)
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61 INTEGER, INTENT(IN) :: a
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62 INTEGER, INTENT(INOUT) :: s
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63 INTEGER :: accumulate
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64
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65 s = s + a
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66 accumulate = s
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67 END FUNCTION accumulate
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68
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69 END PROGRAM main
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