How to understand "<-chan" in declaration?

[Nan Xiao]

Hi all,

When reading runner code in Go in Action, I find the definition of Runner:

type Runner struct {

// interrupt channel reports a signal from the

// operating system.

interrupt chan os.Signal

// complete channel reports that processing is done.

complete chan error

// timeout reports that time has run out.

timeout <-chan time.Time

// tasks holds a set of functions that are executed

// synchronously in index order.

tasks []func(int)

}

How can I understand the "<-chan " in  timeout member declaration?

Thanks in advance!

Best Regards
Nan Xiao

[Axel Wagner]

Hi,

http://golang.org/ref/spec#Channel_types

The arrow gives the direction, so <-chan Foo means it's a read-only
channel, and chan<- Foo means it's a write-only channel (the arrow
points towards or out of the chan).

Best,

Axel

Nan Xiao <xn21...@163.com> writes:

> Hi all,
>
> When reading runner

> <https://github.com/goinaction/code/blob/master/chapter7/patterns/runner/runner.go> code
> in *Go in Action*, I find the definition of Runner:

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[Nan Xiao]

Hi Axel,

Got it! Thanks very much!

Best Regards

Nan Xiao

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[gugl.z...@gmail.com]

It's a receive-only channel.

http://golang.org/ref/spec#Channel_types

http://stackoverflow.com/q/31920353/1892060