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set.go
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set.go
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package connctx
var (
setValue = struct{}{}
)
type set map[interface{}]struct{}
func (s set) exists(key interface{}) bool {
_, exists := s[key]
return exists
}
func (s set) add(keys ...interface{}) (newNum int) {
for _, key := range keys {
if !s.exists(key) {
newNum++
s[key] = setValue
}
}
return
}
func (s set) card() int {
return int(len(s))
}
func (s set) members() (keys []interface{}) {
if s.card() < 1 {
return
}
keys = make([]interface{}, s.card())
index := 0
for key, _ := range s {
keys[index] = key
index++
}
return
}
func (s set) isMember(key interface{}) bool {
_, exists := s[key]
return exists
}
func (s set) rem(keys ...interface{}) (delNum int) {
for _, key := range keys {
if _, exists := s[key]; exists {
delete(s, key)
delNum++
}
}
return
}
func (s set) pop() (item interface{}) {
if s.card() < 1 {
return
}
for key, _ := range s {
item = key
delete(s, key)
break
}
return
}
func (s set) randMember() (item interface{}) {
if s.card() < 1 {
return
}
for key, _ := range s {
item = key
break
}
return
}