go iterator demo

go_iterator.go

package main

import "fmt"

type Ret struct {
	No int
}

func Iter(max int) func() (*Ret, bool) {
	var cur int
	return func() (*Ret, bool) {
		for cur < max {
			cur++
			return &Ret{cur}, true
		}
		return nil, false
	}
}

func RunIter() {
	it := Iter(10)
	for ret, ok := it(); ok; ret, ok = it() {
		fmt.Println(ret.No)
	}
}

func main() {
	RunIter()
}