Method operator()

src/rpp/rpp/operators/flat_map.hpp:25–31

        template<rpp::constraint::observable TObservable>
        auto operator()(TObservable&& observable) const &
        {
            static_assert(std::invocable<Fn, rpp::utils::extract_observable_type_t<TObservable>> && rpp::constraint::observable<std::invoke_result_t<Fn, rpp::utils::extract_observable_type_t<TObservable>>>, "fn should return observable");
            return std::forward<TObservable>(observable)
                 | rpp::ops::map(m_fn)
                 | rpp::ops::merge();
        }

        template<rpp::constraint::observable TObservable>
        auto operator()(TObservable&& observable) &&