The argument when not stated, is using let , in other word it's like put the
variable in stack, that's why it has no address. To bypass that, you must pass
the var to the argument so it's using the same memory place in heap.
import endians
import strutils
proc parse[T](buffer: var openArray[uint8]): T =
let pointer = addr(buffer[0])
when sizeof(T) == 2:
littleEndian16(addr(result), pointer)
elif sizeof(T) == 4:
littleEndian32(addr(result), pointer)
else:
result = (T)42
var buffer = [0x01'u8, 0x23, 0x45, 0x67]
echo toHex(parse[uint16](buffer))
echo toHex(parse[uint32](buffer))
