[GO] slice自动分配内存

package main

import "fmt"

func main() {

    s := make([]int, 0, 3)
    fmt.Println(len(s), cap(s), s) //0 3 []

    s = append(s, 9)
    fmt.Println(len(s), cap(s), &s[0], s) //1 3 0xc0420560a0 [9]

    s = append(s, 8)
    fmt.Println(len(s), cap(s), &s[0], s) //2 3 0xc0420560a0 [9 8]

    s = append(s, 7)
    fmt.Println(len(s), cap(s), &s[0], s) //3 3 0xc0420560a0 [9 8 7]

    //这里容量不足了，会重新分配内存，所以&s[0]改变了。
    s = append(s, 6)
    fmt.Println(len(s), cap(s), &s[0], s) //4 6 0xc042074090 [9 8 7 6]

    s = append(s, 5)
    fmt.Println(len(s), cap(s), &s[0], s) //5 6 0xc042074090 [9 8 7 6 5]

    s = append(s, 4)
    fmt.Println(len(s), cap(s), &s[0], s) //6 6 0xc042074090 [9 8 7 6 5]

    //这里容量又不足了，会重新分配内存，所以&s[0]改变了。
    s = append(s, 3)
    fmt.Println(len(s), cap(s), &s[0], s) //7 12 0xc04204a0c0 [9 8 7 6 5 4 3]
}