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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_FILTER_HPP)
#define RXCPP_OPERATORS_RX_FILTER_HPP
#include "../rx-includes.hpp"
namespace rxcpp {
namespace operators {
namespace detail {
template<class T, class Predicate>
struct filter
{
typedef rxu::decay_t<T> source_value_type;
typedef rxu::decay_t<Predicate> test_type;
test_type test;
filter(test_type t)
: test(std::move(t))
{
}
template<class Subscriber>
struct filter_observer
{
typedef filter_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;
test_type test;
filter_observer(dest_type d, test_type t)
: dest(std::move(d))
, test(std::move(t))
{
}
void on_next(source_value_type v) const {
auto filtered = on_exception([&](){
return !this->test(v);},
dest);
if (filtered.empty()) {
return;
}
if (!filtered.get()) {
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, test_type t) {
return make_subscriber<value_type>(d, this_type(d, std::move(t)));
}
};
template<class Subscriber>
auto operator()(Subscriber dest) const
-> decltype(filter_observer<Subscriber>::make(std::move(dest), test)) {
return filter_observer<Subscriber>::make(std::move(dest), test);
}
};
template<class Predicate>
class filter_factory
{
typedef rxu::decay_t<Predicate> test_type;
test_type predicate;
public:
filter_factory(test_type p) : predicate(std::move(p)) {}
template<class Observable>
auto operator()(Observable&& source)
-> decltype(source.template lift<rxu::value_type_t<rxu::decay_t<Observable>>>(filter<rxu::value_type_t<rxu::decay_t<Observable>>, test_type>(predicate))) {
return source.template lift<rxu::value_type_t<rxu::decay_t<Observable>>>(filter<rxu::value_type_t<rxu::decay_t<Observable>>, test_type>(predicate));
}
};
}
template<class Predicate>
auto filter(Predicate&& p)
-> detail::filter_factory<Predicate> {
return detail::filter_factory<Predicate>(std::forward<Predicate>(p));
}
}
}
#endif
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