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-rw-r--r--Rx/v2/src/rxcpp/operators/rx-pairwise.hpp126
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diff --git a/Rx/v2/src/rxcpp/operators/rx-pairwise.hpp b/Rx/v2/src/rxcpp/operators/rx-pairwise.hpp
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-// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
-
-#pragma once
-
-/*! \file rx-pairwise.hpp
-
- \brief Take values pairwise from this observable.
-
- \return Observable that emits tuples of two the most recent items emitted by the source observable.
-
- \sample
- \snippet pairwise.cpp pairwise sample
- \snippet output.txt pairwise sample
-
- If the source observable emits less than two items, no pairs are emitted by the source observable:
- \snippet pairwise.cpp pairwise short sample
- \snippet output.txt pairwise short sample
-*/
-
-#if !defined(RXCPP_OPERATORS_RX_PAIRWISE_HPP)
-#define RXCPP_OPERATORS_RX_PAIRWISE_HPP
-
-#include "../rx-includes.hpp"
-
-namespace rxcpp {
-
-namespace operators {
-
-namespace detail {
-
-template<class... AN>
-struct pairwise_invalid_arguments {};
-
-template<class... AN>
-struct pairwise_invalid : public rxo::operator_base<pairwise_invalid_arguments<AN...>> {
- using type = observable<pairwise_invalid_arguments<AN...>, pairwise_invalid<AN...>>;
-};
-template<class... AN>
-using pairwise_invalid_t = typename pairwise_invalid<AN...>::type;
-
-template<class T>
-struct pairwise
-{
- typedef rxu::decay_t<T> source_value_type;
- typedef std::tuple<source_value_type, source_value_type> value_type;
-
- template<class Subscriber>
- struct pairwise_observer
- {
- typedef pairwise_observer<Subscriber> this_type;
- typedef std::tuple<source_value_type, source_value_type> value_type;
- typedef rxu::decay_t<Subscriber> dest_type;
- typedef observer<T, this_type> observer_type;
- dest_type dest;
- mutable rxu::detail::maybe<source_value_type> remembered;
-
- pairwise_observer(dest_type d)
- : dest(std::move(d))
- {
- }
- void on_next(source_value_type v) const {
- if (remembered.empty()) {
- remembered.reset(v);
- return;
- }
-
- dest.on_next(std::make_tuple(remembered.get(), v));
- remembered.reset(v);
- }
- void on_error(rxu::error_ptr e) const {
- dest.on_error(e);
- }
- void on_completed() const {
- dest.on_completed();
- }
-
- static subscriber<T, observer_type> make(dest_type d) {
- auto cs = d.get_subscription();
- return make_subscriber<T>(std::move(cs), observer_type(this_type(std::move(d))));
- }
- };
-
- template<class Subscriber>
- auto operator()(Subscriber dest) const
- -> decltype(pairwise_observer<Subscriber>::make(std::move(dest))) {
- return pairwise_observer<Subscriber>::make(std::move(dest));
- }
-};
-
-}
-
-/*! @copydoc rx-pairwise.hpp
-*/
-template<class... AN>
-auto pairwise(AN&&... an)
- -> operator_factory<pairwise_tag, AN...> {
- return operator_factory<pairwise_tag, AN...>(std::make_tuple(std::forward<AN>(an)...));
-}
-
-}
-
-template<>
-struct member_overload<pairwise_tag>
-{
- template<class Observable,
- class Enabled = rxu::enable_if_all_true_type_t<
- is_observable<Observable>>,
- class SourceValue = rxu::value_type_t<Observable>,
- class Pairwise = rxo::detail::pairwise<SourceValue>,
- class Value = rxu::value_type_t<Pairwise>>
- static auto member(Observable&& o)
- -> decltype(o.template lift<Value>(Pairwise())) {
- return o.template lift<Value>(Pairwise());
- }
-
- template<class... AN>
- static operators::detail::pairwise_invalid_t<AN...> member(AN...) {
- std::terminate();
- return {};
- static_assert(sizeof...(AN) == 10000, "pairwise takes no arguments");
- }
-};
-
-}
-
-#endif