auto begin() const { return this->events_.begin(); }
auto end() const { return this->events_.end(); }
auto cbegin() const { return this->events_.cbegin(); }
auto cend() const { return this->events_.cend(); }
auto begin() const { return this->events_.begin(); }
auto end() const { return this->events_.end(); }
auto cbegin() const { return this->events_.cbegin(); }
auto cend() const { return this->events_.cend(); }