51 lines
967 B
Go
51 lines
967 B
Go
package main
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import (
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"code.google.com/p/go-tour/tree"
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"fmt"
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)
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// Walk walks the tree t sending all values
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// from the tree to the channel ch.
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func Walk(t *tree.Tree, ch chan int) {
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// do it as a nested closure so that I can control the call to close so
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// that I can use the range-based forloop in main.main
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var walk func(t *tree.Tree)
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walk = func(t *tree.Tree) {
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if t != nil {
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walk(t.Left)
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ch <- t.Value
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walk(t.Right)
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}
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}
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walk(t)
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close(ch)
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}
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// Same determines whether the trees
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// t1 and t2 contain the same values.
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func Same(t1, t2 *tree.Tree) bool {
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ch1 := make(chan int)
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ch2 := make(chan int)
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go Walk(t1, ch1)
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go Walk(t2, ch2)
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for i := range ch1 {
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if i != <-ch2 {
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return false
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}
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}
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return true
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}
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func main() {
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t := tree.New(1)
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ch := make(chan int)
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go Walk(t, ch)
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for i := range ch {
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fmt.Printf("%d, ", i)
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}
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fmt.Println()
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fmt.Println(Same(tree.New(1), tree.New(1)))
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fmt.Println(Same(tree.New(1), tree.New(2)))
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}
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