go channel take empty struct as input. Can this input be anything?

Question

a := make(chan struct{})

Such this, go channel take empty struct as input. Can this input be anything?

thanks.

score 5 · Accepted Answer · edited May 23 '17 at 11:49

5

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.

edited May 23 '17 at 11:49

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answered Aug 28 '14 at 06:12

VonC

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score 0 · Answer 2 · answered Aug 29 '14 at 01:48

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.

go channel take empty struct as input. Can this input be anything?

2 Answers2