Go by Example - Channel Directions

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Go by Example

Go is an open source programming language designed for building simple, fast, and reliable software.

Go by Example is a hands-on introduction to Go using annotated example programs. Check out the first example or browse the full list below.

Go by Example: Channel Directions

当使用管道作为函数参数时，可以显式声明该管道是作为发送者还是接收者，这种特性增加了程序的类型安全。

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package main

import "fmt"

// 定义ping函数只接受用来发送值的管道参数（即管道是接收者）
// 如果试图从该管道参数中接收值，编译将会报错
func ping(pings chan<- string, msg string) {
    pings <- msg
}

// pong函数接受一个用来接收值的管道pings(即管道是发送者)和一个用来发送值的管道pongs(即管道是接收者)
func pong(pings <-chan string, pongs chan<- string) {
    msg := <-pings
    pongs <- msg
}

func main() {
    pings := make(chan string, 1)
    pongs := make(chan string, 1)

    // 将消息发送到管道pings 
    ping(pings, "passed message")
    
    // 将管道pings中的值发送至管道pongs中
    pong(pings, pongs)
    fmt.Println(<-pongs)
}
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$ go run channel-directions.go
passed message

原文链接：Go by Example: Channel Directions