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module ops_module
abstract interface
subroutine op(x, y, z)
integer, intent(in) :: x, y
integer, intent(out) :: z
end subroutine
end interface
contains
subroutine foo(x, y, r1, r2)
integer, intent(in) :: x, y
integer, intent(out) :: r1, r2
procedure (op) add1, add2
procedure (op), pointer::p
p=>add1
call p(x, y, r1)
p=>add2
call p(x, y, r2)
end subroutine
end module
subroutine add1(x, y, z)
integer, intent(in) :: x, y
integer, intent(out) :: z
z = x + y
end subroutine
subroutine add2(x, y, z)
integer, intent(in) :: x, y
integer, intent(out) :: z
z = x + 2 * y
end subroutine
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