golang具有指针的指针还是指针的引用功能？

Question

Hi everyone in Golang what will you do if you need to change the pointer (change where the pointer points to rather than change the value where this pointer points to). I know it is really easy in C++ by using reference, like"

void myFunc(Type*& ptr)
{
    ptr = anotherPointer;
}

int main
{
    Type* ptr = &someValue;
    myFunc(ptr); // ptr is moved
}

Or equivalently in C, use pointer's pointer:

void myFunc(Type** ptrsptr)
{
    *ptrsptr = anotherPointer;
}

int main
{
    Type* ptr = &someValue;
    myFunc(&ptr); // ptr is moved
}

I wonder if Golang has this neat feature, or if not, the only way is to set at function's return?

Answer 1

You can use a pointer to a pointer, just like in C

http://play.golang.org/p/vE-3otpKkb

package main

import "fmt"

type Type struct{}

var anotherPointer = &Type{}

func myFunc(ptrsptr **Type) {
    *ptrsptr = anotherPointer
}

func main() {
    ptr := &Type{}
    fmt.Printf("%p
", ptr)
    myFunc(&ptr) // ptr is moved
    fmt.Printf("%p
", ptr)
}