[protobuf] Fill message with oneof data

[Aleh Linkin]

I have protobuf:
message Msg
{
oneof type {
   Msg1 msg1 = 1;
   Msg2 msg2 = 2;
   Msg3 msg3 = 3;
....
}
};

Is it possible to fill Msg with protobuf::Message from one of msgs?
Like:

msg1 m1;
//fill m1;
f(&m1);

msg2 m2;
//fill m2;
f(&m2);
...

void f(google::protobuf::Message *m)
{
Msg mainMessage;
// fill mainMessage with data from m correctly? <---
}

I tried CopyFrom but it doesn't work in this case.

Thank you.


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