GO语言 切片的缩短和增长原理

 package main

 import "fmt"
 //import  OS   "os"
 //import "strings"
 //import "path/filepath"

 type Stack []interface{}

 func (s *Stack)f() {
   stack := *s

   fmt.Printf("%p %d %d\n", &s, len(stack), cap(stack))

   *s = stack[:len(stack) - ] //减少

   fmt.Printf("%p %d %d\n", &s, len(*s), cap(*s))

   fmt.Printf("%p %d %d\n", stack, len(stack), cap(stack))

   stack = append(stack, "e", "f") //增加

   fmt.Printf("%p %d %d\n",stack, len(stack), cap(stack))
 }

 func main() {
   var  s Stack
   s = append(s, "a", "b", "c", "d")
   s.f()
   fmt.Println(s)
   fmt.Printf("%t\n", false)
 }