douguadao3883
2015-10-25 01:59
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Golang中=和<-有什么区别

func worker(id int, jobs <-chan int, results chan<- int) {
    for j := range jobs {
        fmt.Println("worker", id, "processing job", j)
        time.Sleep(time.Second)
        results <- j * 2
    }
}

func main() {
    t := time.Now()
    fmt.Println(t)
    jobs := make(chan int, 100)
    results := make(chan int, 100)
    for w := 1; w <= 4; w++ {
        go worker(w, jobs, results)
    }
    for j := 1; j <= 20; j++ {
        jobs <- j
    }
    close(jobs)
    for a := 1; a <= 20; a++ {
        <-results
    }

    t = time.Now()
    fmt.Println(t)
}

I am confused of the "<-" and I can not find any related documents about "<-". So what is the difference between <- and =?? why I can not use = here?

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