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, <> 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

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