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module template_02_m
implicit none
requirement eq(t, ne)
type, deferred :: t
function ne(lhs, rhs)
type(t), intent(in) :: lhs, rhs
logical :: ne
end function
end requirement
template change_positions_tmpl(t, ne)
require :: eq(t, ne)
private
public :: change_positions_t
contains
function change_positions_t(vec) result(mask)
type(t), intent(in) :: vec(:)
integer, allocatable :: pos(:), mask(:)
integer :: i, j, n
n = size(vec)
allocate (pos(n))
if (n < 1) return
pos = 0
pos(1) = 1
j = 1
do i = 2,n
if (ne(vec(i), vec(i-1))) then
j = j+1
pos(j) = i
end if
end do
allocate(mask(j))
do i = 1,j
mask(i) = pos(i)
end do
end function
end template
end module
program template_02
use template_02_m
implicit none
instantiate change_positions_tmpl(integer, operator(/=)), &
only: change_positions_int => change_positions_t
instantiate change_positions_tmpl(character, operator(/=)), &
only: change_positions_chr => change_positions_t
print *, change_positions_int([3, 3, 6, 2, 2, 2, 1])
print *, change_positions_chr(["a", "a", "b", "p", "p", "p", "o"])
end program
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