shiterator.nim

import fowltek/pointer_arithm
proc get_shiterator[T] (some: var seq[T]; idx: TSlice[int]): tuple[start,fin: ptr T] = 
  (some[idx.a].addr, some[idx.b].addr)

var x = @[1,2,3,4,3,2,1]


var (start,fin) = x.get_shiterator(1..5)
while start <= fin:
  echo start[]
  start.inc