Method get_num_keyframes

src/PLPSLAM/data/map_database.cc:113–117

        }

        unsigned int map_database::get_num_keyframes() const
        {
            std::lock_guard<std::mutex> lock(mtx_map_access_);
            return keyframes_.size();
        }

        std::vector<landmark *> map_database::get_all_landmarks() const
        {