mirror of
https://github.com/gopl-zh/gopl-zh.github.com.git
synced 2024-11-19 21:03:43 +00:00
43 lines
696 B
Go
43 lines
696 B
Go
|
// Copyright © 2016 Alan A. A. Donovan & Brian W. Kernighan.
|
||
|
|
// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
|
||
|
|
|
||
|
|
// See page 231.
|
||
|
|
|
||
|
|
// Pipeline3 demonstrates a finite 3-stage pipeline
|
||
|
|
// with range, close, and unidirectional channel types.
|
||
|
|
package main
|
||
|
|
|
||
|
|
import "fmt"
|
||
|
|
|
||
|
|
//!+
|
||
|
|
func counter(out chan<- int) {
|
||
|
|
for x := 0; x < 100; x++ {
|
||
|
|
out <- x
|
||
|
|
}
|
||
|
|
close(out)
|
||
|
|
}
|
||
|
|
|
||
|
|
func squarer(out chan<- int, in <-chan int) {
|
||
|
|
for v := range in {
|
||
|
|
out <- v * v
|
||
|
|
}
|
||
|
|
close(out)
|
||
|
|
}
|
||
|
|
|
||
|
|
func printer(in <-chan int) {
|
||
|
|
for v := range in {
|
||
|
|
fmt.Println(v)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func main() {
|
||
|
|
naturals := make(chan int)
|
||
|
|
squares := make(chan int)
|
||
|
|
|
||
|
|
go counter(naturals)
|
||
|
|
go squarer(squares, naturals)
|
||
|
|
printer(squares)
|
||
|
|
}
|
||
|
|
|
||
|
|
//!-
|