libgo/go/sort/example_reverse_test.go

   1 // Copyright 2011 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 sort_test
   6
   7 import (
   8         "fmt"
   9         "sort"
  10 )
  11
  12 // Reverse embeds a sort.Interface value and implements a reverse sort over
  13 // that value.
  14 type Reverse struct {
  15         // This embedded Interface permits Reverse to use the methods of
  16         // another Interface implementation.
  17         sort.Interface
  18 }
  19
  20 // Less returns the opposite of the embedded implementation's Less method.
  21 func (r Reverse) Less(i, j int) bool {
  22         return r.Interface.Less(j, i)
  23 }
  24
  25 func ExampleInterface_reverse() {
  26         s := []int{5, 2, 6, 3, 1, 4} // unsorted
  27         sort.Sort(Reverse{sort.IntSlice(s)})
  28         fmt.Println(s)
  29         // Output: [6 5 4 3 2 1]
  30 }