Mastering Go - Second Edition

Another example of the unsafe package

In this subsection, you will learn more things about the unsafe package and its capabilities with the help of another small Go program named moreUnsafe.go. This will be presented in three parts. What moreUnsafe.go does is access all the elements of an array using pointers.

The first part of the program is next:

package main 
 
import ( 
   "fmt" 
   "unsafe" 
) 

The second part of moreUnsafe.go comes with the next Go code:

func main() { 
   array := [...]int{0, 1, -2, 3, 4} 
   pointer := &array[0] 
   fmt.Print(*pointer, " ") 
   memoryAddress := uintptr(unsafe.Pointer(pointer)) +  unsafe.Sizeof(array[0]) for i := 0; i < len(array)-1; i++ { pointer = (*int)(unsafe.Pointer(memoryAddress)) fmt.Print(*pointer, " ") memoryAddress = ...