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package main
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import ()
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import "fmt"
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func sendData(d chan<- int) {
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d <- 5
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}
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func main() {
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d := make(chan<- int)
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go sendData(d)
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//fmt.Println(<-d) //试图从一个只写信道中接收数据
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m := make(chan int) // 将双向信道转换为只写或只读信道
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go sendData(m)
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fmt.Println(<-m)
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}
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