Example
A struct is a sequence of named elements, called fields, each of which has a name and a type. Empty struct has no fields, like this anonymous empty struct:
var s struct{}
Or like this named empty struct type:
type T struct{}
The interesting thing about the empty struct is that, its size is zero (try The Go Playground):
fmt.Println(unsafe.Sizeof(s))
This prints 0, so the empty struct itself takes no memory. so it is good option for quit channel, like (try The Go Playground):
package main
import (
"fmt"
"time"
)
func main() {
done := make(chan struct{})
go func() {
time.Sleep(1 * time.Second)
close(done)
}()
fmt.Println("Wait...")
<-done
fmt.Println("done.")
}
