Go实现集合set

package main
//支持任意类型添加
import (
"fmt"
"sync"
)

type inter interface{}

type Set struct {
m map[inter]bool
sync.RWMutex
}

func New() *Set {
return &Set{
m: map[inter]bool{},
}
}
func (s *Set) Add(item inter) {
s.Lock()
defer s.Unlock()
s.m[item] = true
}
func (s *Set) Remove(item inter) {
s.Lock()
s.Unlock()
delete(s.m, item)
}
func (s *Set) Has(item inter) bool {
s.RLock()
defer s.RUnlock()
_, ok := s.m[item]
return ok
}
func (s *Set) Len() int {
return len(s.List())
}
func (s *Set) Clear() {
s.Lock()
defer s.Unlock()
s.m = map[inter]bool{}
}
func (s *Set) IsEmpty() bool {
if s.Len() == 0 {
return true
}
return false
}
func (s *Set) List() []inter {
s.RLock()
defer s.RUnlock()
list := []inter{}
for item := range s.m {
list = append(list, item)
}
return list
}

func main() {
s := New()
s.Add(11)
s.Add("aa")
for i, k := range s.List() {
fmt.Println(i, k)
}
}