Golang 100天学习计划
cap（）函数的计算值
package main
import "fmt"
func main() {
var numbers []int
printSlice(numbers)
/* 允许追加空切片 */
numbers = append(numbers, 0)
printSlice(numbers)
/* 向切片添加一个元素 */
numbers = append(numbers, 1)
printSlice(numbers)
/* 同时添加多个元素 */
numbers = append(numbers, 2,3,4)
printSlice(numbers)
/* 创建切片 numbers1 是之前切片的两倍容量*/
numbers1 := make([]int, len(numbers), (cap(numbers))*2)
/* 拷贝 numbers 的内容到 numbers1 */
copy(numbers1,numbers)
printSlice(numbers1)
}
func printSlice(x []int){
fmt.Printf("len=%d cap=%d slice=%v\n",len(x),cap(x),x)
}
运行结果
len=0 cap=0 slice=[]
len=1 cap=2 slice=[0]
len=2 cap=2 slice=[0 1]
len=5 cap=8 slice=[0 1 2 3 4]
len=5 cap=12 slice=[0 1 2 3 4]
