为什么同时append3个值后，cap会变成6呢？ len = 5,cap = 6,slice = [0 1 2 3 4]
package main
import "fmt"
func main(){
var n []int
printslice(n)
n = append(n,0)
printslice(n)
n = append(n,1)
printslice(n)
n = append(n,2,3,4)
printslice(n)
n1 := make([]int,len(n),(cap(n))*2)
copy(n1,n)
printslice(n1)
}
func printslice(x []int){
fmt.Printf("len = %d,cap = %d,slice = %d\n",len(x),cap(x),x)
len = 0,cap = 0,slice = []
len = 1,cap = 1,slice = [0]
len = 2,cap = 2,slice = [0 1]
len = 5,cap = 6,slice = [0 1 2 3 4]
len = 5,cap = 12,slice = [0 1 2 3 4]
