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优化list——head

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This commit is contained in:
aozhiwei 2023-09-14 22:25:58 +08:00
parent fe65489de2
commit 37aba94237
1 changed files with 36 additions and 31 deletions
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67
listhead.go
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@ -8,6 +8,9 @@ type ListHead struct {
data interface{}
}
var dummyData = &struct {
}{}
func (this *ListHead) Init(data interface{}) {
this.next = this
this.prev = this
@ -44,7 +47,12 @@ func (this *ListHead) AddHead(pnew *ListHead) {
}
func (this *ListHead) FirstEntry() interface{} {
return this.next.data
for pos := this.next; pos != this; pos = pos.next {
if pos.data != dummyData {
return pos.data
}
}
return nil
}
func (this *ListHead) Replace(pnew *ListHead) {
@ -61,7 +69,18 @@ func (this *ListHead) ReplaceInit(pnew *ListHead) {
}
func (this *ListHead) Empty() bool {
return this.next == this
if this.next == this {
return true
}
if this.next.data != dummyData {
return false
}
for pos := this.next; pos != this; pos = pos.next {
if pos.data != dummyData {
return false
}
}
return true
}
func (this *ListHead) DelInit() {
@ -70,13 +89,9 @@ func (this *ListHead) DelInit() {
this.prev = this
}
func (this *ListHead) Next() *ListHead {
return this.next
}
func (this *ListHead) Size() int32 {
num := int32(0)
this.ForEach_r(
this.ForEach(
func (data interface{}) bool {
num++
return true
@ -84,37 +99,27 @@ func (this *ListHead) Size() int32 {
return num
}
func (this *ListHead) ForEachFrom(from *ListHead,
cb ListHead_Foreach_Func) {
for pos := from; pos != this; pos = pos.next {
if !cb(pos.data) {
break
}
}
}
func (this *ListHead) ForEach(cb ListHead_Foreach_Func) {
for pos := this.next; pos != this; pos = pos.next {
if !cb(pos.data) {
cursor := ListHead{}
cursor.data = dummyData
this.AddHead(&cursor)
defer cursor.Del()
for ; cursor.next != this; {
oldN := cursor.next
if cursor.next.data != dummyData && !cb(cursor.next.data) {
break
}
}
}
func (this *ListHead) ForEach_r(cb ListHead_Foreach_Func) {
for pos := this.prev; pos != this; pos = pos.prev {
if !cb(pos.data) {
break
if cursor.next == oldN {
cursor.next = oldN.next
oldN.next.prev = &cursor
oldN.prev = cursor.prev
cursor.prev.next = oldN
oldN.next = &cursor
cursor.prev = oldN
}
}
}
func MakeListHead () *ListHead{
l := new(ListHead)
l.Init(nil)
return l
}
func NewListHead () *ListHead{
l := new(ListHead)
l.Init(nil)