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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_MULTICAST_HPP)
#define RXCPP_OPERATORS_RX_MULTICAST_HPP
#include "../rx-includes.hpp"
namespace rxcpp {
namespace operators {
namespace detail {
template<class T, class Observable, class Subject>
struct multicast : public operator_base<T>
{
typedef rxu::decay_t<Observable> source_type;
typedef rxu::decay_t<Subject> subject_type;
struct multicast_state : public std::enable_shared_from_this<multicast_state>
{
multicast_state(source_type o, subject_type sub)
: source(std::move(o))
, subject_value(std::move(sub))
{
}
source_type source;
subject_type subject_value;
rxu::detail::maybe<typename composite_subscription::weak_subscription> connection;
};
std::shared_ptr<multicast_state> state;
multicast(source_type o, subject_type sub)
: state(std::make_shared<multicast_state>(std::move(o), std::move(sub)))
{
}
template<class Subscriber>
void on_subscribe(Subscriber&& o) const {
state->subject_value.get_observable().subscribe(std::forward<Subscriber>(o));
}
void on_connect(composite_subscription cs) const {
if (state->connection.empty()) {
auto destination = state->subject_value.get_subscriber();
// the lifetime of each connect is nested in the subject lifetime
state->connection.reset(destination.add(cs));
auto localState = state;
// when the connection is finished it should shutdown the connection
cs.add(
[destination, localState](){
if (!localState->connection.empty()) {
destination.remove(localState->connection.get());
localState->connection.reset();
}
});
// use cs not destination for lifetime of subscribe.
state->source.subscribe(cs, destination);
}
}
};
template<class Subject>
class multicast_factory
{
Subject caster;
public:
multicast_factory(Subject sub)
: caster(std::move(sub))
{
}
template<class Observable>
auto operator()(Observable&& source)
-> connectable_observable<rxu::value_type_t<rxu::decay_t<Observable>>, multicast<rxu::value_type_t<rxu::decay_t<Observable>>, Observable, Subject>> {
return connectable_observable<rxu::value_type_t<rxu::decay_t<Observable>>, multicast<rxu::value_type_t<rxu::decay_t<Observable>>, Observable, Subject>>(
multicast<rxu::value_type_t<rxu::decay_t<Observable>>, Observable, Subject>(std::forward<Observable>(source), caster));
}
};
}
template<class Subject>
inline auto multicast(Subject sub)
-> detail::multicast_factory<Subject> {
return detail::multicast_factory<Subject>(std::move(sub));
}
}
}
#endif
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