Go语言利用goroutine实现递归

Recursion And Tail Calls In Go这篇文章讲了用goroutine实现函数递归调用：这样做可以避免过多函数调用引起的堆栈空间的不断增大，感觉很巧妙。以下是例子代码：

package main
import "fmt"

func recursiveCall(product int, num int, ch chan int)  {
    product += num

    if num == 1 {
        ch <- product
        return
    }

    go recursiveCall(product, num - 1, ch)
}

func main()  {
    ch := make(chan int)
    go recursiveCall(0, 4, ch)
    product := <-ch
    fmt.Printf("Product is %d\n", product)
}  

执行结果如下：

Product is 10