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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 229.

// Pipeline2 demonstrates a finite 3-stage pipeline.
package main

import "fmt"

//!+
func main() {
    naturals := make(chan int)
    squares := make(chan int)

    // Counter
    go func() {
        for x := 0; x < 100; x++ {
            naturals <- x
        }
        close(naturals)
    }()

    // Squarer
    go func() {
        for x := range naturals {
            squares <- x * x
        }
        close(squares)
    }()

    // Printer (in main goroutine)
    for x := range squares {
        fmt.Println(x)
    }
}

//!-