* @example window_toggle.cpp **/

* @example with_latest_from.cpp **/

* @example buffer.cpp **/

* @example debounce.cpp **/

* @example group_by.cpp **/

* @example repeat.cpp **/

* @example throttle.cpp **/

* @example merge.cpp **/

* @example take.cpp **/

* @example first.cpp **/

* @example take_while.cpp **/

* @example ref_count.cpp **/

* @example observe_on.cpp **/

* @example switch_on_next.cpp **/

* @example start_with.cpp **/

* @brief Observable calls this method to notify observer about completion of emissions. * @invariant Obtaining of this call means no any furt