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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_RX_CONNECTABLE_OBSERVABLE_HPP)
#define RXCPP_RX_CONNECTABLE_OBSERVABLE_HPP
#include "rx-includes.hpp"
namespace rxcpp {
namespace detail {
template<class T>
struct has_on_connect
{
struct not_void {};
template<class CT>
static auto check(int) -> decltype((*(CT*)nullptr).on_connect(composite_subscription()));
template<class CT>
static not_void check(...);
typedef decltype(check<T>(0)) detail_result;
static const bool value = std::is_same<detail_result, void>::value;
};
}
template<class T>
class dynamic_connectable_observable
: public dynamic_observable<T>
{
struct state_type
: public std::enable_shared_from_this<state_type>
{
typedef std::function<void(composite_subscription)> onconnect_type;
onconnect_type on_connect;
};
std::shared_ptr<state_type> state;
template<class U>
void construct(const dynamic_observable<U>& o, tag_dynamic_observable&&) {
state = o.state;
}
template<class U>
void construct(dynamic_observable<U>&& o, tag_dynamic_observable&&) {
state = std::move(o.state);
}
template<class SO>
void construct(SO&& source, rxs::tag_source&&) {
auto so = std::make_shared<rxu::decay_t<SO>>(std::forward<SO>(source));
state->on_connect = [so](composite_subscription cs) mutable {
so->on_connect(std::move(cs));
};
}
public:
typedef tag_dynamic_observable dynamic_observable_tag;
dynamic_connectable_observable()
{
}
template<class SOF>
explicit dynamic_connectable_observable(SOF sof)
: dynamic_observable<T>(sof)
, state(std::make_shared<state_type>())
{
construct(std::move(sof),
typename std::conditional<is_dynamic_observable<SOF>::value, tag_dynamic_observable, rxs::tag_source>::type());
}
template<class SF, class CF>
dynamic_connectable_observable(SF&& sf, CF&& cf)
: dynamic_observable<T>(std::forward<SF>(sf))
, state(std::make_shared<state_type>())
{
state->on_connect = std::forward<CF>(cf);
}
using dynamic_observable<T>::on_subscribe;
void on_connect(composite_subscription cs) const {
state->on_connect(std::move(cs));
}
};
template<class T, class Source>
connectable_observable<T> make_dynamic_connectable_observable(Source&& s) {
return connectable_observable<T>(dynamic_connectable_observable<T>(std::forward<Source>(s)));
}
/*!
\brief a source of values that is shared across all subscribers and does not start until connectable_observable::connect() is called.
\ingroup group-observable
*/
template<class T, class SourceOperator>
class connectable_observable
: public observable<T, SourceOperator>
{
typedef connectable_observable<T, SourceOperator> this_type;
typedef observable<T, SourceOperator> base_type;
typedef rxu::decay_t<SourceOperator> source_operator_type;
static_assert(detail::has_on_connect<source_operator_type>::value, "inner must have on_connect method void(composite_subscription)");
public:
typedef tag_connectable_observable observable_tag;
connectable_observable()
{
}
explicit connectable_observable(const SourceOperator& o)
: base_type(o)
{
}
explicit connectable_observable(SourceOperator&& o)
: base_type(std::move(o))
{
}
// implicit conversion between observables of the same value_type
template<class SO>
connectable_observable(const connectable_observable<T, SO>& o)
: base_type(o)
{}
// implicit conversion between observables of the same value_type
template<class SO>
connectable_observable(connectable_observable<T, SO>&& o)
: base_type(std::move(o))
{}
///
/// takes any function that will take this observable and produce a result value.
/// this is intended to allow externally defined operators, that use subscribe,
/// to be connected into the expression.
///
template<class OperatorFactory>
auto op(OperatorFactory&& of) const
-> decltype(of(*(const this_type*)nullptr)) {
return of(*this);
static_assert(is_operator_factory_for<this_type, OperatorFactory>::value, "Function passed for op() must have the signature Result(SourceObservable)");
}
///
/// performs type-forgetting conversion to a new composite_observable
///
connectable_observable<T> as_dynamic() {
return *this;
}
composite_subscription connect(composite_subscription cs = composite_subscription()) {
base_type::source_operator.on_connect(cs);
return cs;
}
/*! @copydoc rx-ref_count.hpp
*/
template<class... AN>
auto ref_count(AN... an) const
/// \cond SHOW_SERVICE_MEMBERS
-> decltype(observable_member(ref_count_tag{}, *(this_type*)nullptr, std::forward<AN>(an)...))
/// \endcond
{
return observable_member(ref_count_tag{}, *this, std::forward<AN>(an)...);
}
/*! @copydoc rx-connect_forever.hpp
*/
template<class... AN>
auto connect_forever(AN... an) const
/// \cond SHOW_SERVICE_MEMBERS
-> decltype(observable_member(connect_forever_tag{}, *(this_type*)nullptr, std::forward<AN>(an)...))
/// \endcond
{
return observable_member(connect_forever_tag{}, *this, std::forward<AN>(an)...);
}
};
}
//
// support range() >> filter() >> subscribe() syntax
// '>>' is spelled 'stream'
//
template<class T, class SourceOperator, class OperatorFactory>
auto operator >> (const rxcpp::connectable_observable<T, SourceOperator>& source, OperatorFactory&& of)
-> decltype(source.op(std::forward<OperatorFactory>(of))) {
return source.op(std::forward<OperatorFactory>(of));
}
//
// support range() | filter() | subscribe() syntax
// '|' is spelled 'pipe'
//
template<class T, class SourceOperator, class OperatorFactory>
auto operator | (const rxcpp::connectable_observable<T, SourceOperator>& source, OperatorFactory&& of)
-> decltype(source.op(std::forward<OperatorFactory>(of))) {
return source.op(std::forward<OperatorFactory>(of));
}
#endif
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