When using channels as function parameters, you can specify if a channel is meant to only send or receive values. This specificity increases the type-safety of the program
package main import ( "fmt" ) func ping(pings chan<- string, message string) { pings <- message } func pong(pings <-chan string, pongs chan<- string) { msg := <-pings pongs <- msg } func main() { pings := make(chan string, 1) pongs := make(chan string, 1) ping(pings, "passed message") pong(pings, pongs) fmt.Println(<-pongs) }
总结
1 : ....
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