英文:
What does `(<-chan Delivery)(deliveries)` do?
问题
我找到了这行代码：
return (<-chan Delivery)(deliveries), nil
它的作用是什么？为什么有双括号？
英文:
I found this line:
return (<-chan Delivery)(deliveries), nil
https://github.com/streadway/amqp/blob/master/channel.go#L1089
What does it do? Why the double parentheses?
答案1
得分: 9
这是一个类型转换。在你的情况下，它将chan Delivery（双向的Delivery值通道）转换为<-chan Delivery（只接收Delivery值的通道）。
英文:
It's a type conversion. In your case, it converts chan Delivery (two-way channel of Delivery values) to <-chan Delivery (receive-only channel of Delivery values).
答案2
得分: 4
这是一个类型转换。将deliveries转换为只读通道。
英文:
It is a type conversion. Returns deliveries as a read-only channel.
答案3
得分: 4
这是从双向通道转换为只发送通道的类型转换，如果你提供它，可以省略。转换将隐式完成。
英文:
Its a type conversion from two-way channel to send-only channel and in case you provide it can be omitted. Conversion would be done implicitly.
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