golang中单向channel的语法介绍

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今天闲来无事补充一下golang的语法知识，想起来看看context的用法，结果碰到了一个没见过的channel语法：

// A Context carries a deadline, cancelation signal, and request-scoped values
// across API boundaries. Its methods are safe for simultaneous use by multiple
// goroutines.
type Context interface {
 // Done returns a channel that is closed when this `Context` is canceled
 // or times out.
 Done() <-chan struct{}
 
 // Err indicates why this Context was canceled, after the Done channel
 // is closed.
 Err() error
 
 // Deadline returns the time when this Context will be canceled, if any.
 Deadline() (deadline time.Time, ok bool)
 
 // Value returns the value associated with key or nil if none.
 Value(key interface{}) interface{}
}

Done() <- chan struct{}

Done() chan struct{} 

chan struct{}struct{}type Name struct{a int, b bool}

<- chan struct{}ch := make(chan struct{}) chan struct{}

<-chan int<-chan intchan <- int

总结

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