Go 语言规范Receive operator
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For an operand ch of channel type, the value of the receive operation <-ch is the value received from the channel ch. The channel direction must permit receive operations, and the type of the receive operation is the element type of the channel. The expression blocks until a value is available. Receiving from a nil channel blocks forever. A receive operation on a closed channel can always proceed immediately, yielding the element type's zero value after any previously sent values have been received.
v1 := <-ch
v2 = <-ch
f(<-ch)
<-strobe // wait until clock pulse and discard received valueA receive expression used in an assignment or initialization of the special form
x, ok = <-ch
x, ok := <-ch
var x, ok = <-ch
var x, ok T = <-chyields an additional untyped boolean result reporting whether the communication succeeded. The value of ok is true if the value received was delivered by a successful send operation to the channel, or false if it is a zero value generated because the channel is closed and empty.
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