【寒江雪】Go实现迭代器模式

Iterator Pattern

实现

package iterator

import "container/list"

type Container interface{
Iterator()Iterator
}

type List struct{
list list.List
}

func (this *List)Iterator()Iterator{
return &ListIterator{this.list.Front(),this.list.Back()}
}

func (this *List)Add(value interface{}){
this.list.PushBack(value)
}

package iterator

import (
"container/list"
)

type Iterator interface{
HasNext()bool
Value()interface{}
Next()
}

type ListIterator struct {
cur *list.Element
end *list.Element
}

func (this *ListIterator)HasNext()bool{
return this.cur != this.end
}

func (this *ListIterator)Next(){
this.cur=this.cur.Next()
}

func (this *ListIterator)Value()interface{}{
return this.cur.Value
}

package main

import (
"projects/DesignPatternsByGo/behavioralPatterns/iterator"
"fmt"
)

func main() {
l := iterator.List{}
l.Add(1)
l.Add(2)
l.Add(3)
l.Add(4)
i := l.Iterator()
for i.HasNext(){
x := i.Value().(int)
fmt.Println(x)
i.Next()
}
}

有钱的捧个钱场，没钱的捧个人场。

出来混不容易。