one-dimensional-cellular-automata-2.go

package main

import (
	"fmt"
	"sync"
)

const (
	start    = "_###_##_#_#_#_#__#__"
	offLeft  = '_'
	offRight = '_'
	dead     = '_'
)

func main() {
	fmt.Println(start)
	a := make([]byte, len(start)+2)
	a[0] = offLeft
	copy(a[1:], start)
	a[len(a)-1] = offRight
	var read, write sync.WaitGroup
	read.Add(len(start) + 1)
	for i := 1; i <= len(start); i++ {
		go cell(a[i-1:i+2], &read, &write)
	}
	for i := 0; i < 10; i++ {
		write.Add(len(start) + 1)
		read.Done()
		read.Wait()
		read.Add(len(start) + 1)
		write.Done()
		write.Wait()
		fmt.Println(string(a[1 : len(a)-1]))
	}
}

func cell(kernel []byte, read, write *sync.WaitGroup) {
	var next byte
	for {
		l, v, r := kernel[0], kernel[1], kernel[2]
		read.Done()
		switch {
		case l != r:
			next = v
		case v == dead:
			next = l
		default:
			next = dead
		}
		read.Wait()
		kernel[1] = next
		write.Done()
		write.Wait()
	}
}

//\One-dimensional-cellular-automata\one-dimensional-cellular-automata-2.go