1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
|
module reverse_m
implicit none
private
public :: reverse_tmpl
requirement default_behavior(t)
type, deferred :: t
end requirement
template reverse_tmpl(t)
require :: default_behavior(t)
private
public :: reverse
contains
subroutine swap(x, y)
type(t), intent(inout) :: x, y
type(t) :: tmp
tmp = x
x = y
y = tmp
end subroutine
subroutine reverse(arr)
type(t), intent(inout) :: arr(:)
integer :: i, j
do i = 1, size(arr)/2
j = size(arr)+1-i
call swap(arr(i), arr(j))
end do
end subroutine
end template
contains
subroutine test_reverse()
instantiate reverse_tmpl(integer), &
only: ireverse => reverse
integer :: a(5)
a = [1,2,3,4,5]
call ireverse(a)
print *, a
if (a(1) /= 5) error stop
if (a(5) /= 1) error stop
end subroutine
end module
program main
use reverse_m
call test_reverse()
end program
|
