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diff --git a/Rx/v2/src/rxcpp/operators/rx-distinct_until_changed.hpp b/Rx/v2/src/rxcpp/operators/rx-distinct_until_changed.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-distinct_until_changed.hpp
-
- \brief For each item from this observable, filter out consequentially repeated values and emit only changes from the new observable that is returned.
-
- \tparam BinaryPredicate (optional) the type of the value comparing function. The signature should be equivalent to the following: bool pred(const T1& a, const T2& b);
-
- \param pred (optional) the function that implements comparison of two values.
-
- \return Observable that emits those items from the source observable that are distinct from their immediate predecessors.
-
- \sample
- \snippet distinct_until_changed.cpp distinct_until_changed sample
- \snippet output.txt distinct_until_changed sample
-*/
-
-#if !defined(RXCPP_OPERATORS_RX_DISTINCT_UNTIL_CHANGED_HPP)
-#define RXCPP_OPERATORS_RX_DISTINCT_UNTIL_CHANGED_HPP
-
-#include "../rx-includes.hpp"
-
-namespace rxcpp {
-
-namespace operators {
-
-namespace detail {
-
-template<class... AN>
-struct distinct_until_changed_invalid_arguments {};
-
-template<class... AN>
-struct distinct_until_changed_invalid : public rxo::operator_base<distinct_until_changed_invalid_arguments<AN...>> {
- using type = observable<distinct_until_changed_invalid_arguments<AN...>, distinct_until_changed_invalid<AN...>>;
-};
-template<class... AN>
-using distinct_until_changed_invalid_t = typename distinct_until_changed_invalid<AN...>::type;
-
-template<class T, class BinaryPredicate>
-struct distinct_until_changed
-{
- typedef rxu::decay_t<T> source_value_type;
- typedef rxu::decay_t<BinaryPredicate> predicate_type;
-
- predicate_type pred;
-
- distinct_until_changed(predicate_type p)
- : pred(std::move(p))
- {
- }
-
- template<class Subscriber>
- struct distinct_until_changed_observer
- {
- typedef distinct_until_changed_observer<Subscriber> this_type;
- typedef source_value_type value_type;
- typedef rxu::decay_t<Subscriber> dest_type;
- typedef observer<value_type, this_type> observer_type;
-
- dest_type dest;
- predicate_type pred;
- mutable rxu::detail::maybe<source_value_type> remembered;
-
- distinct_until_changed_observer(dest_type d, predicate_type pred)
- : dest(std::move(d))
- , pred(std::move(pred))
- {
- }
- void on_next(source_value_type v) const {
- if (remembered.empty() || !pred(v, remembered.get())) {
- remembered.reset(v);
- dest.on_next(v);
- }
- }
- void on_error(rxu::error_ptr e) const {
- dest.on_error(e);
- }
- void on_completed() const {
- dest.on_completed();
- }
-
- static subscriber<value_type, observer_type> make(dest_type d, predicate_type p) {
- return make_subscriber<value_type>(d, this_type(d, std::move(p)));
- }
- };
-
- template<class Subscriber>
- auto operator()(Subscriber dest) const
- -> decltype(distinct_until_changed_observer<Subscriber>::make(std::move(dest), pred)) {
- return distinct_until_changed_observer<Subscriber>::make(std::move(dest), pred);
- }
-};
-
-}
-
-/*! @copydoc rx-distinct_until_changed.hpp
-*/
-template<class... AN>
-auto distinct_until_changed(AN&&... an)
- -> operator_factory<distinct_until_changed_tag, AN...> {
- return operator_factory<distinct_until_changed_tag, AN...>(std::make_tuple(std::forward<AN>(an)...));
-}
-
-}
-
-template<>
-struct member_overload<distinct_until_changed_tag>
-{
- template<class Observable,
- class SourceValue = rxu::value_type_t<Observable>,
- class Enabled = rxu::enable_if_all_true_type_t<
- is_observable<Observable>>,
- class DistinctUntilChanged = rxo::detail::distinct_until_changed<SourceValue, rxu::equal_to<>>>
- static auto member(Observable&& o)
- -> decltype(o.template lift<SourceValue>(DistinctUntilChanged(rxu::equal_to<>()))) {
- return o.template lift<SourceValue>(DistinctUntilChanged(rxu::equal_to<>()));
- }
-
- template<class Observable,
- class BinaryPredicate,
- class SourceValue = rxu::value_type_t<Observable>,
- class Enabled = rxu::enable_if_all_true_type_t<
- is_observable<Observable>>,
- class DistinctUntilChanged = rxo::detail::distinct_until_changed<SourceValue, BinaryPredicate>>
- static auto member(Observable&& o, BinaryPredicate&& pred)
- -> decltype(o.template lift<SourceValue>(DistinctUntilChanged(std::forward<BinaryPredicate>(pred)))) {
- return o.template lift<SourceValue>(DistinctUntilChanged(std::forward<BinaryPredicate>(pred)));
- }
-
- template<class... AN>
- static operators::detail::distinct_until_changed_invalid_t<AN...> member(AN...) {
- std::terminate();
- return {};
- static_assert(sizeof...(AN) == 10000, "distinct_until_changed takes (optional BinaryPredicate)");
- }
-};
-
-}
-
-#endif