tour_of_go_concurrency_5.go

package main

import (
	"fmt"

	"golang.org/x/tour/tree"
)

// Walk walks the tree t sending all values
// from the tree to the channel ch.
func Walk(t *tree.Tree, ch chan int) {
	if t.Left != nil {
		Walk(t.Left, ch)
	}
	if t != nil {
		ch <- t.Value
	}
	if t.Right != nil {
		Walk(t.Right, ch)
	}
}

// Same determines whether the trees
// t1 and t2 contain the same values.
func Same(t1, t2 *tree.Tree) bool {
	c1 := make(chan int)
	c2 := make(chan int)
	go func() {
		Walk(t1, c1)
		close(c1)
	}()
	go func() {
		Walk(t2, c2)
		close(c2)
	}()
	for v := range c1 {
		if v != <-c2 {
			return false
		}
	}
	return true
}

func main() {
	fmt.Println(Same(tree.New(1), tree.New(1)))
}