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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
#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 T>
struct distinct_until_changed
{
typedef typename std::decay<T>::type source_value_type;
template<class Subscriber>
struct distinct_until_changed_observer
{
typedef distinct_until_changed_observer<Subscriber> this_type;
typedef source_value_type value_type;
typedef typename std::decay<Subscriber>::type dest_type;
typedef observer<value_type, this_type> observer_type;
dest_type dest;
mutable rxu::detail::maybe<source_value_type> remembered;
distinct_until_changed_observer(dest_type d)
: dest(d)
{
}
void on_next(source_value_type v) const {
if (remembered.empty() || v != remembered.get()) {
remembered.reset(v);
dest.on_next(v);
}
}
void on_error(std::exception_ptr e) const {
dest.on_error(e);
}
void on_completed() const {
dest.on_completed();
}
static subscriber<value_type, observer<value_type, this_type>> make(dest_type d) {
return make_subscriber<value_type>(d, this_type(d));
}
};
template<class Subscriber>
auto operator()(Subscriber dest) const
-> decltype(distinct_until_changed_observer<Subscriber>::make(std::move(dest))) {
return distinct_until_changed_observer<Subscriber>::make(std::move(dest));
}
};
class distinct_until_changed_factory
{
public:
template<class Observable>
auto operator()(Observable&& source)
-> decltype(source.template lift<typename std::decay<Observable>::type::value_type>(distinct_until_changed<typename std::decay<Observable>::type>::value_type)) {
return source.template lift<typename std::decay<Observable>::type::value_type>(distinct_until_changed<typename std::decay<Observable>::type>::value_type);
}
};
}
inline auto distinct_until_changed()
-> detail::distinct_until_changed_factory {
return detail::distinct_until_changed_factory();
}
}
}
#endif
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