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| // Copyright 2011 The Go Authors. All rights reserved.
| // Use of this source code is governed by a BSD-style
| // license that can be found in the LICENSE file.
|
| package sort_test
|
| import (
| "fmt"
| "sort"
| )
|
| type Grams int
|
| func (g Grams) String() string { return fmt.Sprintf("%dg", int(g)) }
|
| type Organ struct {
| Name string
| Weight Grams
| }
|
| type Organs []*Organ
|
| func (s Organs) Len() int { return len(s) }
| func (s Organs) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
|
| // ByName implements sort.Interface by providing Less and using the Len and
| // Swap methods of the embedded Organs value.
| type ByName struct{ Organs }
|
| func (s ByName) Less(i, j int) bool { return s.Organs[i].Name < s.Organs[j].Name }
|
| // ByWeight implements sort.Interface by providing Less and using the Len and
| // Swap methods of the embedded Organs value.
| type ByWeight struct{ Organs }
|
| func (s ByWeight) Less(i, j int) bool { return s.Organs[i].Weight < s.Organs[j].Weight }
|
| func Example_sortWrapper() {
| s := []*Organ{
| {"brain", 1340},
| {"heart", 290},
| {"liver", 1494},
| {"pancreas", 131},
| {"prostate", 62},
| {"spleen", 162},
| }
|
| sort.Sort(ByWeight{s})
| fmt.Println("Organs by weight:")
| printOrgans(s)
|
| sort.Sort(ByName{s})
| fmt.Println("Organs by name:")
| printOrgans(s)
|
| // Output:
| // Organs by weight:
| // prostate (62g)
| // pancreas (131g)
| // spleen (162g)
| // heart (290g)
| // brain (1340g)
| // liver (1494g)
| // Organs by name:
| // brain (1340g)
| // heart (290g)
| // liver (1494g)
| // pancreas (131g)
| // prostate (62g)
| // spleen (162g)
| }
|
| func printOrgans(s []*Organ) {
| for _, o := range s {
| fmt.Printf("%-8s (%v)\n", o.Name, o.Weight)
| }
| }
|
|
