There is no way to do that. A message does not know what message it is
contained inside. Pointers only go down to submessages, not up to parent
messages.
On Friday, April 28, 2017 at 3:49:41 AM UTC-7, Peter Wang wrote:
>
> Hello,
>
> 1. message Foo's definition,
> message Foo {
> extensions 100 to 199;
> }
>
> 2. extension message Baz's definition,
> message Baz {
> extend Foo {
> optional Baz foo_ext = 124;
> }
> }
>
> 3. get the baz object's pointer by foo object use the MutableExtension()
> API,
> Foo foo;
> Baz* baz = foo.MutableExtension(Baz::foo_ext);
> FillInMyBaz(baz);
>
> But how to get the foo object by baz?
>
> Best Regards,
> Peter
>
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