115 lines
3.3 KiB
C++
115 lines
3.3 KiB
C++
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// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
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#pragma once
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/*! \file rx-ignore_elements.hpp
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\brief Do not emit any items from the source Observable, but allow termination notification (either onError or onCompleted) to pass through unchanged.
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\return Observable that emits termination notification from the source observable.
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\sample
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\snippet ignore_elements.cpp ignore_elements sample
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\snippet output.txt ignore_elements sample
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*/
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#if !defined(RXCPP_OPERATORS_RX_IGNORE_ELEMENTS_HPP)
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#define RXCPP_OPERATORS_RX_IGNORE_ELEMENTS_HPP
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#include "../rx-includes.hpp"
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namespace rxcpp {
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namespace operators {
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namespace detail {
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template<class... AN>
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struct ignore_elements_invalid_arguments {};
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template<class... AN>
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struct ignore_elements_invalid : public rxo::operator_base<ignore_elements_invalid_arguments<AN...>> {
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using type = observable<ignore_elements_invalid_arguments<AN...>, ignore_elements_invalid<AN...>>;
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};
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template<class... AN>
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using ignore_elements_invalid_t = typename ignore_elements_invalid<AN...>::type;
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template<class T>
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struct ignore_elements {
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typedef rxu::decay_t<T> source_value_type;
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template<class Subscriber>
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struct ignore_elements_observer
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{
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typedef ignore_elements_observer<Subscriber> this_type;
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typedef source_value_type value_type;
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typedef rxu::decay_t<Subscriber> dest_type;
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typedef observer<value_type, this_type> observer_type;
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dest_type dest;
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ignore_elements_observer(dest_type d)
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: dest(d)
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{
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}
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void on_next(source_value_type) const {
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// no-op; ignore element
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}
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void on_error(rxu::error_ptr e) const {
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dest.on_error(e);
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}
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void on_completed() const {
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dest.on_completed();
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}
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static subscriber<value_type, observer_type> make(dest_type d) {
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return make_subscriber<value_type>(d, this_type(d));
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}
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};
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template<class Subscriber>
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auto operator()(Subscriber dest) const
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-> decltype(ignore_elements_observer<Subscriber>::make(std::move(dest))) {
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return ignore_elements_observer<Subscriber>::make(std::move(dest));
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}
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};
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}
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/*! @copydoc rx-ignore_elements.hpp
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*/
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template<class... AN>
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auto ignore_elements(AN&&... an)
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-> operator_factory<ignore_elements_tag, AN...> {
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return operator_factory<ignore_elements_tag, AN...>(std::make_tuple(std::forward<AN>(an)...));
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}
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}
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template<>
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struct member_overload<ignore_elements_tag>
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{
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template<class Observable,
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class SourceValue = rxu::value_type_t<Observable>,
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class Enabled = rxu::enable_if_all_true_type_t<
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is_observable<Observable>>,
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class IgnoreElements = rxo::detail::ignore_elements<SourceValue>>
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static auto member(Observable&& o)
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-> decltype(o.template lift<SourceValue>(IgnoreElements())) {
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return o.template lift<SourceValue>(IgnoreElements());
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}
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template<class... AN>
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static operators::detail::ignore_elements_invalid_t<AN...> member(AN...) {
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std::terminate();
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return {};
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static_assert(sizeof...(AN) == 10000, "ignore_elements takes no arguments");
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}
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};
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}
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#endif
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