Hello,
I'm trying to have an abstract layer which delivers
google::protobuf::Message, I assign a type by setting the descriptor.
This all works great.
Now I have a general callback function which has one argument, a reference
to a protobuf message.
static void receiveCallback(google::protobuf::Message &message)
Now another software layer of mine uses this abstract library, this layer
has messages defined. So I'm looking for a performant way to cast this
reference and I'm not quite sure why it wont work.
Using a dynamic_cast throws a bad cast exception, using a static_cast the
datas are not set.
try {
MsgFrame & frame = dynamic_cast<MsgFrame&>(message);
LOG(DEBUG)<<frame.number();
} catch (const std::bad_cast& e) {
LOG(WARNING) << e.what();
}
However when I create a new MsgFrame and use CopyFrom(..) it works as
expected. But this is not wanted due to performance overhead.
What is the correct way to cast it?
Thanks in advance!
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