英文:
go channel take empty struct as input. Can this input be anything?
问题
a := make(chan struct{})
这样，Go 通道以空结构作为输入。这个输入可以是任何东西吗？
谢谢。
英文:
a := make(chan struct{})
Such this, go channel take empty struct as input. Can this input be anything?
thanks.
答案1
得分: 5
不：它可以是一个空结构体（struct{}{}），而不是“任何东西”。
要表示“任何东西”，你需要使用interface{}。
正如我在“Go Golang：匿名结构体和空结构体”中解释的那样，空结构体在传递大小为0的对象时非常有用！这是一种很好的方式来表示某件事情已经完成。
英文:
No: it can be an empty struct (struct{}{}), not "anything"
To be "anything", you would need interface{}.
As I explain in "Go Golang : anonymous struct and empty struct", an empty struct is useful to pass an object of size... 0! It is a good way to signal the completion that something has happened.
答案2
得分: 0
struct{}在其他语言中类似于单位类型（unit type），它只有一个没有信息的值。从这样的通道获取的值不包含任何信息，但是可以将这样的通道用于在某个事件发生时进行信号传递。当有东西发送到该通道时，接收该通道的goroutine会被唤醒。
英文:
struct{} is much like the unit type in other languages; it only has one value with no information. The values you get from such a channel would contain no information, but such a channel could be used for signalling when some event happened. A goroutine receiving from that channel would wake up whenever something is sent to it.
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