Thanks for the definite answer! That´s what I needed to know.

On 4 Jun., 22:44, Kenton Varda <ken...@google.com> wrote:
> Sorry, Protocol Buffers only supports trees, not DAGs.  So, you need to
> devise some other way to identify objects on top of that.
>
> On Thu, Jun 4, 2009 at 7:26 AM, <h...@icandy.de> wrote:
> > // Add Wheel
> > Wheel *to_replace = car->mutable_wheel();
> > *to_replace = existing_wheel;
>
> In this code you're actually making a copy of the wheel, not adding a
> reference.
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