How to get the next enum value from an enum in protobuf?

I have a protobuf message with non-consecutive enum values something like this:

message Information {
    enum Versions {
        version1 = 0;
        version2 = 1;
        version3 = 10;
        version4 = 20;   
        version5 = 30;    
    }
}

I want to have a C++ function GetNextVersion() which takes in one enum version and gives the next version as output. For eg: GetNextVersion(Information::version4) should give Information::version5 as output. Is there any inbuilt and easy method to do this?

You can use protobuf's reflection to achieve the goal:

Information::Versions GetNextVersion(Information::Versions ver) {
    const auto *desc = Information::Versions_descriptor();
    auto cur_idx = desc->FindValueByNumber(ver)->index();
    if (cur_idx >= desc->value_count() - 1) {
        throw runtime_error("no next enum");
    }

    auto next_idx = cur_idx + 1;
    return Information::Versions(desc->value(next_idx)->number());
}

int main() {
    try {
        auto ver = Information::version1;
        while (true) {
            cout << ver << endl;
            ver = GetNextVersion(ver);
        }
    } catch (const runtime_error &e) {
        cout << e.what() << endl;
    }
    return 0;
}