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      1 // Copyright 2009 The Go Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style
      3 // license that can be found in the LICENSE file.
      4 
      5 package main
      6 
      7 import (
      8 	"fmt"
      9 	"sort"
     10 )
     11 
     12 func main() {
     13 	seq := Sequence{6, 2, -1, 44, 16}
     14 	sort.Sort(seq)
     15 	fmt.Println(seq)
     16 }
     17 
     18 type Sequence []int
     19 
     20 // Methods required by sort.Interface.
     21 func (s Sequence) Len() int {
     22 	return len(s)
     23 }
     24 func (s Sequence) Less(i, j int) bool {
     25 	return s[i] < s[j]
     26 }
     27 func (s Sequence) Swap(i, j int) {
     28 	s[i], s[j] = s[j], s[i]
     29 }
     30 
     31 // Method for printing - sorts the elements before printing.
     32 func (s Sequence) String() string {
     33 	sort.Sort(s)
     34 	str := "["
     35 	for i, elem := range s {
     36 		if i > 0 {
     37 			str += " "
     38 		}
     39 		str += fmt.Sprint(elem)
     40 	}
     41 	return str + "]"
     42 }
     43