Go中channel可以是只读、只写、同时可读写的。
//定义只读的channel
read_only := make (<-chan int)
//定义只写的channel
write_only := make (chan<- int)
//可同时读写
read_write := make (chan int)
定义只读和只写的channel意义不大,一般用于在参数传递中,见代码:
package main import ( "fmt" "time" ) func main() { c := make(chan int) go send(c) go recv(c) time.Sleep(3 * time.Second) } //只能向chan里写数据 func send(c chan<- int) { for i := 0; i < 10; i++ { c <- i } } //只能取channel中的数据 func recv(c <-chan int) { for i := range c { fmt.Println(i) } }
如果将上面send方法和recv方法中的参数对调:
func send(c <-chanint) {
func recv(c chan<- int) {
编译就会报错:
./channel.go:18: invalid operation: c <- i (send to receive-only type <-chan int)
./channel.go:24: invalid operation: range c (receive from send-only type chan<- int)
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