package main

 

import (

"fmt"

)

 

func main() {

var a = []int{0, 1, 2, 3, 4, 5, 6, 7}

var s = make([]int, 6)

 

//源长度为8，目标为6，只会复制前6个

n1 := copy(s, a)

fmt.Println("s - ", s)

fmt.Println("n1 - ", n1)

 

//源长为7，目标为6，复制索引1到6

n2 := copy(s, a[1:])

fmt.Println("s - ", s)

fmt.Println("n2 - ", n2)

 

//源长为8-5=3，只会复制3个值，目标中的后三个值不会变

n3 := copy(s, a[5:])

fmt.Println("s - ", s)

fmt.Println("n3 - ", n3)

 

//将源中的索引5,6,7复制到目标中的索引3,4,5

n4 := copy(s[3:], a[5:])

fmt.Println("s - ", s)

fmt.Println("n4 - ", n4)

}