Go编程语言允许传递一个指针到函数中。 为此，只需将函数的参数声明为指针类型。
看看下面一个简单的例子，传递了两个指针给一个函数，并在函数里面改变它们的值，这个值反映在调用函数中：
package main
import "fmt"
func main() {
/* local variable definition */
var a int = 100
var b int= 200
fmt.Printf("Before swap, value of a : %d\n", a )
fmt.Printf("Before swap, value of b : %d\n", b )
/* calling a function to swap the values.
* &a indicates pointer to a ie. address of variable a and
* &b indicates pointer to b ie. address of variable b.
*/
swap(&a, &b);
fmt.Printf("After swap, value of a : %d\n", a )
fmt.Printf("After swap, value of b : %d\n", b )
}
func swap(x *int, y *int) {
var temp int
temp = *x /* save the value at address x */
*x = *y /* put y into x */
*y = temp /* put temp into y */
}
当上述代码编译和执行时，它产生以下结果：
Before swap, value of a :100
Before swap, value of b :200
After swap, value of a :200
After swap, value of b :100
