Yaron Sumel

type slice struct {
	array unsafe.Pointer
	len   int
	cap   int
}

sliceHeader := (*reflect.SliceHeader)(unsafe.Pointer(&x))
log.Printf("%p",unsafe.Pointer(sliceHeader.Data))

package main

import (
	"fmt"
	"reflect"
	"unsafe"
)

// create slice with zero length and capacity of 5
var x = make([]string, 0, 5)

func main() {
	// use unsafe to get ptr of x
	// cast into SliceHeader
	sliceHeader := (*reflect.SliceHeader)(unsafe.Pointer(&x))
	// iterate and make our slice grow bigger
	for t := 0; t < 10; t++ {
		// append something into our slice to grow our slice
		// when slice is growing out of it's cap size
		// underlying data array will be copied to different address with bigger cap size
		x = append(x, "1")
		fmt.Printf("cap %d slice:%p array:%p \r\n ", cap(x), &x, unsafe.Pointer(sliceHeader.Data))
	}
}