feat(Go-Tool)： 创建Set，实现相关方法

util/set/Set.go

@@ -0,0 +1,44 @@
+/*
+ *  @Author : huangzj
+ *  @Time : 2020/6/15 16:16
+ *  @Description：
+ */
+
+package set
+
+import "sync"
+
+type Set struct {
+	setMap sync.Map //用来存储元素的map
+}
+
+func (set *Set) Add(i interface{}) {
+	set.setMap.Store(i, nil)
+}
+
+func (set *Set) Remove(i interface{}) {
+	set.setMap.Delete(i)
+}
+
+func (set *Set) Contains(i interface{}) bool {
+	_, has := set.setMap.Load(i)
+	return has
+}
+
+func (set *Set) IsEmpty() bool {
+	length := 0
+	set.setMap.Range(func(key, value interface{}) bool {
+		length = length + 1
+		return true
+	})
+	return length == 0
+}
+
+func (set *Set) GetAllSet() []interface{} {
+	list := make([]interface{}, 0)
+	set.setMap.Range(func(key, value interface{}) bool {
+		list = append(list, key)
+		return true
+	})
+	return list
+}