feat add rxcpp
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tqcq
247
3party/rxcpp/operators/rx-switch_on_next.hpp
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247
3party/rxcpp/operators/rx-switch_on_next.hpp
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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-switch_on_next.hpp
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\brief Return observable that emits the items emitted by the observable most recently emitted by the source observable.
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\tparam Coordination the type of the scheduler (optional).
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\param cn the scheduler to synchronize sources from different contexts (optional).
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\return Observable that emits the items emitted by the observable most recently emitted by the source observable.
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\sample
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\snippet switch_on_next.cpp switch_on_next sample
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\snippet output.txt switch_on_next sample
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*/
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#if !defined(RXCPP_OPERATORS_RX_SWITCH_ON_NEXT_HPP)
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#define RXCPP_OPERATORS_RX_SWITCH_ON_NEXT_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 switch_on_next_invalid_arguments {};
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template<class... AN>
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struct switch_on_next_invalid : public rxo::operator_base<switch_on_next_invalid_arguments<AN...>> {
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using type = observable<switch_on_next_invalid_arguments<AN...>, switch_on_next_invalid<AN...>>;
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};
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template<class... AN>
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using switch_on_next_invalid_t = typename switch_on_next_invalid<AN...>::type;
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template<class T, class Observable, class Coordination>
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struct switch_on_next
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: public operator_base<rxu::value_type_t<rxu::decay_t<T>>>
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{
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//static_assert(is_observable<Observable>::value, "switch_on_next requires an observable");
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//static_assert(is_observable<T>::value, "switch_on_next requires an observable that contains observables");
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typedef switch_on_next<T, Observable, Coordination> this_type;
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typedef rxu::decay_t<T> source_value_type;
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typedef rxu::decay_t<Observable> source_type;
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typedef typename source_type::source_operator_type source_operator_type;
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typedef source_value_type collection_type;
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typedef typename collection_type::value_type collection_value_type;
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typedef rxu::decay_t<Coordination> coordination_type;
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typedef typename coordination_type::coordinator_type coordinator_type;
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struct values
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{
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values(source_operator_type o, coordination_type sf)
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: source_operator(std::move(o))
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, coordination(std::move(sf))
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{
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}
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source_operator_type source_operator;
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coordination_type coordination;
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};
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values initial;
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switch_on_next(const source_type& o, coordination_type sf)
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: initial(o.source_operator, std::move(sf))
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{
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}
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template<class Subscriber>
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void on_subscribe(Subscriber scbr) const {
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static_assert(is_subscriber<Subscriber>::value, "subscribe must be passed a subscriber");
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typedef Subscriber output_type;
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struct switch_state_type
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: public std::enable_shared_from_this<switch_state_type>
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, public values
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{
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switch_state_type(values i, coordinator_type coor, output_type oarg)
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: values(i)
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, source(i.source_operator)
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, pendingCompletions(0)
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, coordinator(std::move(coor))
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, out(std::move(oarg))
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{
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}
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observable<source_value_type, source_operator_type> source;
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// on_completed on the output must wait until all the
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// subscriptions have received on_completed
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int pendingCompletions;
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coordinator_type coordinator;
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composite_subscription inner_lifetime;
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output_type out;
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};
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auto coordinator = initial.coordination.create_coordinator(scbr.get_subscription());
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// take a copy of the values for each subscription
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auto state = std::make_shared<switch_state_type>(initial, std::move(coordinator), std::move(scbr));
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composite_subscription outercs;
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// when the out observer is unsubscribed all the
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// inner subscriptions are unsubscribed as well
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state->out.add(outercs);
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auto source = on_exception(
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[&](){return state->coordinator.in(state->source);},
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state->out);
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if (source.empty()) {
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return;
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}
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++state->pendingCompletions;
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// this subscribe does not share the observer subscription
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// so that when it is unsubscribed the observer can be called
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// until the inner subscriptions have finished
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auto sink = make_subscriber<collection_type>(
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state->out,
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outercs,
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// on_next
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[state](collection_type st) {
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state->inner_lifetime.unsubscribe();
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state->inner_lifetime = composite_subscription();
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// when the out observer is unsubscribed all the
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// inner subscriptions are unsubscribed as well
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auto innerlifetimetoken = state->out.add(state->inner_lifetime);
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state->inner_lifetime.add(make_subscription([state, innerlifetimetoken](){
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state->out.remove(innerlifetimetoken);
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--state->pendingCompletions;
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}));
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auto selectedSource = state->coordinator.in(st);
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// this subscribe does not share the source subscription
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// so that when it is unsubscribed the source will continue
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auto sinkInner = make_subscriber<collection_value_type>(
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state->out,
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state->inner_lifetime,
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// on_next
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[state, st](collection_value_type ct) {
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state->out.on_next(std::move(ct));
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},
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// on_error
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[state](rxu::error_ptr e) {
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state->out.on_error(e);
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},
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//on_completed
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[state](){
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if (state->pendingCompletions == 1) {
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state->out.on_completed();
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}
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}
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);
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auto selectedSinkInner = state->coordinator.out(sinkInner);
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++state->pendingCompletions;
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selectedSource.subscribe(std::move(selectedSinkInner));
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},
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// on_error
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[state](rxu::error_ptr e) {
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state->out.on_error(e);
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},
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// on_completed
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[state]() {
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if (--state->pendingCompletions == 0) {
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state->out.on_completed();
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}
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}
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);
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auto selectedSink = on_exception(
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[&](){return state->coordinator.out(sink);},
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state->out);
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if (selectedSink.empty()) {
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return;
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}
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source->subscribe(std::move(selectedSink.get()));
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}
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};
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}
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/*! @copydoc rx-switch_on_next.hpp
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*/
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template<class... AN>
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auto switch_on_next(AN&&... an)
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-> operator_factory<switch_on_next_tag, AN...> {
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return operator_factory<switch_on_next_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<switch_on_next_tag>
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{
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template<class 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 SourceValue = rxu::value_type_t<Observable>,
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class SwitchOnNext = rxo::detail::switch_on_next<SourceValue, rxu::decay_t<Observable>, identity_one_worker>,
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class Value = rxu::value_type_t<SourceValue>,
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class Result = observable<Value, SwitchOnNext>
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>
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static Result member(Observable&& o) {
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return Result(SwitchOnNext(std::forward<Observable>(o), identity_current_thread()));
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}
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template<class Observable, class Coordination,
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class Enabled = rxu::enable_if_all_true_type_t<
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is_observable<Observable>,
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is_coordination<Coordination>>,
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class SourceValue = rxu::value_type_t<Observable>,
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class SwitchOnNext = rxo::detail::switch_on_next<SourceValue, rxu::decay_t<Observable>, rxu::decay_t<Coordination>>,
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class Value = rxu::value_type_t<SourceValue>,
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class Result = observable<Value, SwitchOnNext>
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>
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static Result member(Observable&& o, Coordination&& cn) {
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return Result(SwitchOnNext(std::forward<Observable>(o), std::forward<Coordination>(cn)));
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}
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template<class... AN>
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static operators::detail::switch_on_next_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, "switch_on_next takes (optional Coordination)");
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}
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};
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}
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#endif
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