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fix the wrong comment (#446)

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the original words are :
A channel type may be annotated to specify that it may only send or only receive in certain code:
var send_only chan<- int // channel can only receive data
var recv_only <-chan int // channel can only send data
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Neal Caffery
2018-04-06 05:25:59 +08:00
committed by 无闻
parent af797a594f
commit 80b3ba64d2
1 changed files with 2 additions and 2 deletions
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eBook/14.2.md
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@@ -525,8 +525,8 @@ for {
通道类型可以用注解来表示它只发送或者只接收： 通道类型可以用注解来表示它只发送或者只接收：
```go ```go
var send_only chan<- int // channel can only send data var send_only chan<- int // channel can only receive data
var recv_only <-chan int // channel can only receive data var recv_only <-chan int // channel can only send data
``` ```
只接收的通道（<-chan T）无法关闭，因为关闭通道是发送者用来表示不再给通道发送值了，所以对只接收通道是没有意义的。通道创建的时候都是双向的，但也可以分配有方向的通道变量，就像以下代码： 只接收的通道（<-chan T）无法关闭，因为关闭通道是发送者用来表示不再给通道发送值了，所以对只接收通道是没有意义的。通道创建的时候都是双向的，但也可以分配有方向的通道变量，就像以下代码：