gopl-zh.github.com/vendor/gopl.io/ch8/pipeline3/main.go

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// 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)
}
//!-