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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_FINALLY_HPP)
#define RXCPP_OPERATORS_RX_FINALLY_HPP
#include "../rx-includes.hpp"
namespace rxcpp {
namespace operators {
namespace detail {
template<class T, class LastCall>
struct finally
{
typedef typename std::decay<T>::type source_value_type;
typedef typename std::decay<LastCall>::type last_call_type;
last_call_type last_call;
finally(last_call_type lc)
: last_call(std::move(lc))
{
}
template<class Subscriber>
struct finally_observer
{
typedef finally_observer<Subscriber> this_type;
typedef source_value_type value_type;
typedef typename std::decay<Subscriber>::type dest_type;
typedef observer<value_type, this_type> observer_type;
dest_type dest;
finally_observer(dest_type d)
: dest(std::move(d))
{
}
void on_next(source_value_type v) const {
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, const last_call_type& lc) {
auto dl = d.get_subscription();
composite_subscription cs;
dl.add(cs);
cs.add([=](){
dl.unsubscribe();
lc();
});
return make_subscriber<value_type>(cs, this_type(d));
}
};
template<class Subscriber>
auto operator()(Subscriber dest) const
-> decltype(finally_observer<Subscriber>::make(std::move(dest), last_call)) {
return finally_observer<Subscriber>::make(std::move(dest), last_call);
}
};
template<class LastCall>
class finally_factory
{
typedef typename std::decay<LastCall>::type last_call_type;
last_call_type last_call;
public:
finally_factory(last_call_type lc) : last_call(std::move(lc)) {}
template<class Observable>
auto operator()(Observable&& source)
-> decltype(source.template lift<typename std::decay<Observable>::type::value_type>(filter<typename std::decay<Observable>::type::value_type, last_call_type>(last_call))) {
return source.template lift<typename std::decay<Observable>::type::value_type>(filter<typename std::decay<Observable>::type::value_type, last_call_type>(last_call));
}
};
}
template<class LastCall>
auto finally(LastCall lc)
-> detail::finally_factory<LastCall> {
return detail::finally_factory<LastCall>(std::move(lc));
}
}
}
#endif
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