blob: de8cad58bf59b46a0deafd6f5ae8a378b308c402 [file] [log] [blame]
// +build ignore,OMIT
package main
import (
"fmt"
"code.google.com/p/go-tour/tree"
)
func Walk(root *tree.Tree, quit chan struct{}) chan int {
ch := make(chan int)
go func() {
walk(root, ch, quit)
close(ch)
}()
return ch
}
func walk(t *tree.Tree, ch chan int, quit chan struct{}) {
if t.Left != nil {
walk(t.Left, ch, quit)
}
select { // HL
case ch <- t.Value: // HL
case <-quit: // HL
return // HL
} // HL
if t.Right != nil {
walk(t.Right, ch, quit)
}
}
// STOP OMIT
func Same(t1, t2 *tree.Tree) bool {
quit := make(chan struct{}) // HL
defer close(quit) // HL
w1, w2 := Walk(t1, quit), Walk(t2, quit)
for {
v1, ok1 := <-w1
v2, ok2 := <-w2
if v1 != v2 || ok1 != ok2 {
return false
}
if !ok1 {
return true
}
}
}
func main() {
fmt.Println(Same(tree.New(3), tree.New(3)))
fmt.Println(Same(tree.New(1), tree.New(2)))
}