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package main

import (
    "sort"
    "fmt"
)

func main() {
    ps := Persons{}
    ps.persons = append(ps.persons, &Person{1, "mjy"})
    ps.persons = append(ps.persons, &Person{3, "wxy"})
    ps.persons = append(ps.persons, &Person{2, "zzy"})
    ps.persons = append(ps.persons, &Person{5, "cyy"})
    ps.persons = append(ps.persons, &Person{4, "wzh"})
    ps.by = func(p, q *Person) bool {
        return p.Id < q.Id
    }
    sort.Sort(ps)
    for _, v := range ps.persons {
        fmt.Println(v)
    }
}

type Person struct {
    Id   int
    Name string
}
type Persons struct {
    persons []*Person
    by      func(p, q *Person) bool
}

func (this Persons) Len() int {
    return len(this.persons)
}

func (this Persons) Less(i, j int) bool {
    return this.by(this.persons[i], this.persons[j])
}
func (this Persons) Swap(i, j int) {
    this.persons[i], this.persons[j] = this.persons[j], this.persons[i]
}