golang chanel

golang 推荐通过消息来共享内存，而不是通过共享内存来通信

chanel 是一等公民可以作为函数参数，函数返回值

chanel 必须有接受者，否则会deadlock

func worker(id int, c chan int) {
    fmt.Println(123)
    // for n := range c {
    //  fmt.Printf("Worker %d received %c\n",
    //      id, n)
    // }
}



func chanDemo() {
    channel := make(chan int,3)
    go worker(0, channel)
    channel <- 'a' + 0
    channel <- 'a' + 1
    channel <- 'a' + 2
    channel <- 'a' + 3



    time.Sleep(time.Millisecond)
}

func main() {
    chanDemo()
}

函数时一等公民可以作为函数参数和返回参数

func adder() func(int) int {
    sum := 0
    return func(v int) int {
        sum += v
        return sum
    }
}

type iAdder func(int) (int, iAdder)

func adder2(base int) iAdder {
    return func(v int) (int, iAdder) {
        return base + v, adder2(base + v)
    }
}

func main() {
    // a := adder() is trivial and also works.
    a := adder2(0)
    for i := 0; i < 10; i++ {
        var s int
        s, a = a(i)
        fmt.Printf("0 + 1 + ... + %d = %d\n",
            i, s)
    }
}

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