Go-如何复制界面切片？

Question

I'm trying to implement a simple merge sort using an auxiliary array. I have type byString []string that implements the Less, Swap, and Len methods. It's basically following Go's sort package's interface.

However, I'm having some difficulty choosing the best route to copy the byString slice to a temporary array.

Please help me break out of Java's polymorphism world to make it work with Go.

func merge(data Interface, lo, mid, hi int) {
  i, j := lo, mid+1

  // How do I copy data's elements to a new slice called aux?
}

Answer 1

Use the built-in copy function, you just have to declare the new slice as an interface type:

type Interface []string

func merge(data Interface, lo, mid, hi int) {
    i, j := lo, mid+1
    var aux Interface = make([]string, len(data), len(data))
    copy(aux, data)
}