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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-multicast.hpp
\brief allows connections to the source to be independent of subscriptions.
\tparam Subject the subject to multicast the source Observable.
\param sub the subject.
*/
#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... AN>
struct multicast_invalid_arguments {};
template<class... AN>
struct multicast_invalid : public rxo::operator_base<multicast_invalid_arguments<AN...>> {
using type = observable<multicast_invalid_arguments<AN...>, multicast_invalid<AN...>>;
};
template<class... AN>
using multicast_invalid_t = typename multicast_invalid<AN...>::type;
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);
}
}
};
}
/*! @copydoc rx-multicast.hpp
*/
template<class... AN>
auto multicast(AN&&... an)
-> operator_factory<multicast_tag, AN...> {
return operator_factory<multicast_tag, AN...>(std::make_tuple(std::forward<AN>(an)...));
}
}
template<>
struct member_overload<multicast_tag>
{
template<class Observable, class Subject,
class Enabled = rxu::enable_if_all_true_type_t<
is_observable<Observable>>,
class SourceValue = rxu::value_type_t<Observable>,
class Multicast = rxo::detail::multicast<SourceValue, rxu::decay_t<Observable>, rxu::decay_t<Subject>>,
class Value = rxu::value_type_t<Multicast>,
class Result = connectable_observable<Value, Multicast>>
static Result member(Observable&& o, Subject&& sub) {
return Result(Multicast(std::forward<Observable>(o), std::forward<Subject>(sub)));
}
template<class... AN>
static operators::detail::multicast_invalid_t<AN...> member(AN...) {
std::terminate();
return {};
static_assert(sizeof...(AN) == 10000, "multicast takes (Subject)");
}
};
}
#endif
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