var a: ptr int16 var t = @[1.int16, 2.int16, 3.int16] proc `+`[T](a: ptr T, b: int): ptr T = if b >= 0: cast[ptr T](cast[uint](a) + cast[uint](b * a[].sizeof)) else: cast[ptr T](cast[uint](a) - cast[uint](-1 * b * a[].sizeof)) template `-`[T](a: ptr T, b: int): ptr T = `+`(a, -b) a = t[0].addr echo a[] a = a + 1 echo a[] a = a + 1 echo a[] a = a + -1 echo a[] a = a - 1 echo a[]