(use "errno.witx")

(typename $pair_ints
  (struct
    (field $first s32)
    (field $second s32)))

(typename $pair_int_ptrs
  (struct
    (field $first (@witx const_pointer s32))
    (field $second (@witx const_pointer s32))))

(typename $pair_int_and_ptr
  (struct
    (field $first (@witx const_pointer s32))
    (field $second s32)))

(typename $some_bytes (array u8))

(typename $struct_of_array
  (struct
    (field $arr $some_bytes)))

(module $structs
  (@interface func (export "sum_of_pair")
    (param $an_pair $pair_ints)
    (result $error $errno)
    (result $doubled s64))
  (@interface func (export "sum_of_pair_of_ptrs")
    (param $an_pair $pair_int_ptrs)
    (result $error $errno)
    (result $doubled s64))
  (@interface func (export "sum_of_int_and_ptr")
    (param $an_pair $pair_int_and_ptr)
    (result $error $errno)
    (result $double s64))
  (@interface func (export "return_pair_ints")
    (result $error $errno)
    (result $an_pair $pair_ints))
  (@interface func (export "return_pair_of_ptrs")
    (param $first (@witx const_pointer s32))
    (param $second (@witx const_pointer s32))
    (result $error $errno)
    (result $an_pair $pair_int_ptrs))
  (@interface func (export "sum_array")
    (param $an_arr $struct_of_array)
    (result $error $errno)
    (result $doubled u16))
)