[protobuf] oneof field: define an empty member

[Maxim]

Hi all,

I am looking for some guidance what would be the best way to define a 
member of a oneof field where the actual value of the member does not 
matter and it is sufficient to know that it was selected.

A somewhat contrived example:

message SearchRequest {
    oneof options {
        ValueDoesNotMatter search_all = 1;
        ValueDoesNotMatter search_starred = 2;
        string search_named = 3;
    }
}

My first choice would be an empty message like google.protobuf.Empty, but 
it seems that in C++ it is somewhat cumbersome to select that member:


message.mutable_options().set_allocated_search_all(new google::protobuf::
Empty);


I thought maybe I am doing it wrong and there is a better way?

Thanks,

Maxim


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