dc0d於 2017年12月31日星期日 UTC+8下午11時40分44秒寫道：
>
> Or the (not only) other option is check for nil channels before entering
> the scope of select?
>
Change a little bit of your code.
package main
import (
"log"
"time"
)
func main() {
f(nil)
f(make(chan bool))
}
func first() bool {
select {}
}
func f(rcvd chan bool) {
// for demonstration purpose
select {
case rcvd <- first():
case <-time.After(time.Second):
log.Println("timeout")
}
log.Println("done")
}
func init() {
log.SetFlags(0)
}
Now you are living in panic (pun intended) with worries whether it block
or not, as you can not guarantee what value is passed into the function.
Does this seem good or common sense to you?
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