[protobuf] Shall I put protobuf message in unique_ptr to avoid copy?

[river]

here is my code, should I directly usage vector<IndexVector> ?
    std::vector<std::unique_ptr<IndexVector>> ret; // IndexVector is a 
protobuf message type, sizeof ... = 72

    while (result.next()) {
        std::unique_ptr<IndexVector> indexVector 
{std::make_unique<IndexVector>()};
        int64_t poiId = result.getLLong(1);
        int64_t pictureId = result.getLLong(2);
        bool isDel = result.getInt(3) != 0;

        indexVector->set_id(pictureId);
        indexVector->set_poiid(poiId);
        indexVector->set_isdel(isDel);

        ret.push_back(indexVector);
    }
    return ret;

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