GoGC

type Road int
func findRoad(r *Road) {
    log.Printf("memory free : %p %v \n ", r, *r)
}
func entry() {
    rd := new(Road)
    *rd = 100
    runtime.SetFinalizer(rd, findRoad) // 在对象被 GC 时执行
}

func main() {
    entry()
    for i := 0; i < 10; i++ {
        time.Sleep(time.Second)
        runtime.GC()
    }
}