有没有办法让频道只接收？

Question

这显然有效：

// cast chan string to <-chan string

func RecOnly(c chan string) <-chan string {

    return c

}

func main() {

    a := make(chan string, 123)

    b := RecOnly(a)

    a <- "one"

    a <- "two"

    //b <- "beta" // compile error because of send to receive-only channel

    fmt.Println("a", <-a, "b", <-b)

}

但是有没有一个单线来做到这一点，而不声明一个新功能？

Answer 1

您可以将b的类型显式定义为仅接收通道并将其值设置为a。您还可以投射a到仅接收频道。从Go 规范：通道可能被限制为只能发送或只能通过转换或分配接收。func main() {&nbsp; &nbsp; a := make(chan string, 123)&nbsp; &nbsp; var b <-chan string = a // or, b := (<-chan string)(a)&nbsp; &nbsp; a <- "one"&nbsp; &nbsp; a <- "two"&nbsp; &nbsp; //b <- "beta" // compile error because of send to receive-only channel&nbsp; &nbsp; fmt.Println("a", <-a, "b", <-b)}