// Prime Sieve in Go.

// Taken from the Go specification.

// Copyright © The Go Authors.

​

package main

​

import "fmt"

​

// Send the sequence 2, 3, 4, ... to channel 'ch'.

func generate(ch chan<- int) {

        for i := 2; ; i++ {

                ch <- i  // Send 'i' to channel 'ch'

        }

}

​

// Copy the values from channel 'src' to channel 'dst',

// removing those divisible by 'prime'.

func filter(src <-chan int, dst chan<- int, prime int) {

        for i := range src {    // Loop over values received from 'src'.

                if i%prime != 0 {

                        dst <- i  // Send 'i' to channel 'dst'.

                }

        }

}

​

// The prime sieve: Daisy-chain filter processes together.

func sieve() {

        ch := make(chan int)  // Create a new channel.

        go generate(ch)       // Start generate() as a subprocess.

        for {

                prime := <-ch

                fmt.Print(prime, "\n")