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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_PAIRWISE_HPP)
#define RXCPP_OPERATORS_RX_PAIRWISE_HPP
#include "../rx-includes.hpp"
namespace rxcpp {
namespace operators {
namespace detail {
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(std::exception_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));
}
};
class pairwise_factory
{
public:
template<class Observable>
auto operator()(Observable&& source)
-> decltype(source.template lift<rxu::value_type_t<pairwise<rxu::value_type_t<rxu::decay_t<Observable>>>>>(pairwise<rxu::value_type_t<rxu::decay_t<Observable>>>())) {
return source.template lift<rxu::value_type_t<pairwise<rxu::value_type_t<rxu::decay_t<Observable>>>>>(pairwise<rxu::value_type_t<rxu::decay_t<Observable>>>());
}
};
}
inline auto pairwise()
-> detail::pairwise_factory {
return detail::pairwise_factory();
}
}
}
#endif
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