func Sort(data Interface) {
  // Switch to heapsort if depth of 2*ceil(lg(n+1)) is reached.
  n := data.Len()
  maxDepth := 0
  for i := n; i > 0; i >>= 1 {
    maxDepth++
  }
  maxDepth *= 2
  quickSort(data, 0, n, maxDepth)
}
 
func quickSort(data Interface, a, b, maxDepth int) {
  for b-a > 12 { // Use ShellSort for slices <= 12 elements
    if maxDepth == 0 {
      heapSort(data, a, b)
      return
    }
    maxDepth--
    mlo, mhi := doPivot(data, a, b)
    // Avoiding recursion on the larger subproblem guarantees
    // a stack depth of at most lg(b-a).
    if mlo-a < b-mhi {
      quickSort(data, a, mlo, maxDepth)
      a = mhi // i.e., quickSort(data, mhi, b)
    } else {
      quickSort(data, mhi, b, maxDepth)
      b = mlo // i.e., quickSort(data, a, mlo)
    }
  }
  if b-a > 1 {
    // Do ShellSort pass with gap 6
    // It could be written in this simplified form cause b-a <= 12
    for i := a + 6; i < b; i++ {
      if data.Less(i, i-6) {
        data.Swap(i, i-6)
      }
    }
    insertionSort(data, a, b)
  }
}

package main
 
import (
  "sort" 
)
 
type subInfo struct {
  Count uint  `json:"count"`
}
 
type SubList []*subInfo
 
func (p SubList) Swap(i, j int)   { p[i], p[j] = p[j], p[i] }
func (p SubList) Len() int      { return len(p) }
func (p SubList) Less(i, j int) bool { return p[i].Count > p[j].Count }
 
func main() {
  st_list := SubList{}
  for i := 0; i < 10; i ++{
    _sub := &subInfo{
      Count: uint(i),
    }
    st_list = append(st_list, _sub)
  }
  sort.Sort(st_list)
  return
}