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package set
type ElementaryElem struct {
key int
val interface{}
next *ElementaryElem
}
type Elementary struct {
root *ElementaryElem
}
func NewElementary() *Elementary {
return &Elementary{}
}
func (s Elementary) Empty() bool {
return s.root == nil
}
func (s Elementary) Set(key int, val interface{}) {
if s.Empty() {
s.root = &ElementaryElem{key, val, nil}
return
}
elem := s.root
for {
if elem.key == key {
elem.val = val
return
}
if elem.next == nil {
elem.next = &ElementaryElem{key, val, nil}
return
}
elem = elem.next
}
}
func (s Elementary) Get(key int) interface{} {
elem := s.root
for elem != nil {
if elem.key == key {
return elem.val
}
elem = elem.next
}
return nil
}
func (s Elementary) Del(key int) interface{} {
if s.Empty() {
return nil
}
if s.root.key == key {
defer func() { s.root = nil }()
return s.root.val
}
elem := s.root
for elem.next != nil {
if elem.next.key == key {
defer func() { elem.next = elem.next.next }()
return elem.next.val
}
elem = elem.next
}
return nil
}
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