gistfile1.go

package main

type SomeCollection struct {
    members []int
}

func (this *SomeCollection) Append(i int) {
    this.members = append(this.members, i)
}

func (this *SomeCollection) Each_callback(f func(int)) {
    for _, member := range this.members {
        f(member)
    }
}

func (this *SomeCollection) Each_channel() chan int {
    ch := make(chan int)
    go func() {
        for _, member := range this.members {
            ch <- member
        }
        close(ch)
    }()
    return ch
}


func main() {
    values := new(SomeCollection)
    for i := 0; i < 1000000; i++ {
        values.Append(i)
    }

    values.Each_callback(func(i int) {
        i += 0
    })

    for i := range values.Each_channel() {
        i += 0
    }
}