即提供遍历功能函数

package main


import "log"


// Iterator
// 迭代器，即提供遍历功能函数
// 如sqlx的rows迭代器


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


type ArrayIterator struct {
    array []interface{}
    index *int
}


func (a *ArrayIterator) Index() int {
    return *a.index


}


func (a *ArrayIterator) Value() interface{} {
    return a.array[*a.index]
}


func (a *ArrayIterator) HasNext() bool {
    return *a.index+1 <= len(a.array)
}


func (a *ArrayIterator) Next() {
    if a.HasNext() {
        *a.index++
    }
}


func main() {


    slice := []interface{}{1, 3, 9, 2, 8, 7}
    a := 0
    iter := ArrayIterator{array: slice, index: &a}


    for it := iter; it.HasNext(); iter.Next() {
        index := it.Index()
        value := it.Value()


        if value != slice[index] {
            log.Println("error")
        }


        log.Println(index, value)
    }


}