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! Test: abstract interface defined after the generic interface that uses it.
! Fortran allows forward references within a module specification section.
module interface_31_mod
implicit none
type :: result_t
integer :: status = 0
end type
abstract interface
subroutine callback_iface(x)
integer, intent(in) :: x
end subroutine
end interface
interface run
module function run_impl(cmd, callback) result(res)
character(*), intent(in) :: cmd
procedure(callback_iface), optional :: callback
type(result_t) :: res
end function
end interface
end module
submodule (interface_31_mod) interface_31_sub
contains
module function run_impl(cmd, callback) result(res)
character(*), intent(in) :: cmd
procedure(callback_iface), optional :: callback
type(result_t) :: res
res%status = 1
if (present(callback)) then
call callback(42)
res%status = 2
end if
end function
end submodule
program interface_31
use interface_31_mod, only: result_t, run
implicit none
type(result_t) :: r
r = run("test", callback=my_cb)
if (r%status /= 2) error stop
r = run("test2")
if (r%status /= 1) error stop
print *, "PASS"
contains
subroutine my_cb(x)
integer, intent(in) :: x
if (x /= 42) error stop
end subroutine
end program
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