Go language pointer to a pointer
If a pointer variable to store the pointer is the address of another variable, called the pointer variable as a pointer to a pointer variable.
When you define a pointer to a pointer variable, a pointer to the first holding the second address pointer, the second pointer variable storage Address:
A pointer to a pointer variable declarations following format:
var ptr **int;
More than a pointer to a pointer to an integer variable.
Access pointer to a pointer variable value requires the use of two asterisk, as follows:
package main
import "fmt"
func main() {
var a int
var ptr *int
var pptr **int
a = 3000
/* 指针 ptr 地址 */
ptr = &a
/* 指向指针 ptr 地址 */
pptr = &ptr
/* 获取 pptr 的值 */
fmt.Printf("变量 a = %d\n", a )
fmt.Printf("指针变量 *ptr = %d\n", *ptr )
fmt.Printf("指向指针的指针变量 **pptr = %d\n", **pptr)
}
Examples of the implementation of the above output is:
变量 a = 3000 指针变量 *ptr = 3000 指向指针的指针变量 **pptr = 3000