package main
import (
"fmt"
"unsafe"
)
type Slice struct {
ptr unsafe.Pointer
len int
cap int
}
func printSlice(name string, s []int) {
myS := (*Slice)(unsafe.Pointer(&s))
fmt.Printf("name:%+v\n", myS)
}
func main() {
s1 := make([]int, 6)
fmt.Printf("s1=%+v len=%d cap=%d\n", s1, len(s1), cap(s1))
printSlice("s1", s1)
s2 := s1[2:3]
printSlice("s2", s2)
s3 := s1[3:6:15]
printSlice("s3", s3)
fmt.Println("vim-go")
}
s3:=s1[2:3:4] s3的ptr指向s1底层array的2号位置，长度为3-2=1，cap的结尾指向s1底层array的4号位置，即cap=4-2=2
