Function create

src/rpp/rpp/sources/create.hpp:60–63

     */
    template<constraint::decayed_type Type, constraint::on_subscribe<Type> OnSubscribe>
    auto create(OnSubscribe&& on_subscribe)
    {
        return create_observable<Type, std::decay_t<OnSubscribe>>{std::forward<OnSubscribe>(on_subscribe)};
    }

    /**
     * @brief Construct observable specialized with passed callback function. Most easiesest way to construct observable "on the fly" via lambda and etc.