135 lines
3.8 KiB
C++
135 lines
3.8 KiB
C++
// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
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#pragma once
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/*! \file rx-finally.hpp
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\brief Add a new action at the end of the new observable that is returned.
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\tparam LastCall the type of the action function
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\param lc the action function
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\return Observable that emits the same items as the source observable, then invokes the given action.
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\sample
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\snippet finally.cpp finally sample
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\snippet output.txt finally sample
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If the source observable generates an error, the final action is still being called:
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\snippet finally.cpp error finally sample
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\snippet output.txt error finally sample
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*/
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#if !defined(RXCPP_OPERATORS_RX_FINALLY_HPP)
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#define RXCPP_OPERATORS_RX_FINALLY_HPP
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#include "../rx-includes.hpp"
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namespace rxcpp {
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namespace operators {
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namespace detail {
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template<class... AN>
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struct finally_invalid_arguments {};
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template<class... AN>
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struct finally_invalid : public rxo::operator_base<finally_invalid_arguments<AN...>> {
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using type = observable<finally_invalid_arguments<AN...>, finally_invalid<AN...>>;
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};
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template<class... AN>
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using finally_invalid_t = typename finally_invalid<AN...>::type;
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template<class T, class LastCall>
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struct finally
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{
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typedef rxu::decay_t<T> source_value_type;
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typedef rxu::decay_t<LastCall> last_call_type;
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last_call_type last_call;
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finally(last_call_type lc)
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: last_call(std::move(lc))
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{
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}
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template<class Subscriber>
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struct finally_observer
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{
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typedef finally_observer<Subscriber> this_type;
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typedef source_value_type value_type;
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typedef rxu::decay_t<Subscriber> dest_type;
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typedef observer<value_type, this_type> observer_type;
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dest_type dest;
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finally_observer(dest_type d)
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: dest(std::move(d))
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{
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}
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void on_next(source_value_type v) const {
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dest.on_next(v);
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}
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void on_error(rxu::error_ptr e) const {
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dest.on_error(e);
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}
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void on_completed() const {
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dest.on_completed();
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}
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static subscriber<value_type, observer_type> make(dest_type d, const last_call_type& lc) {
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auto dl = d.get_subscription();
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composite_subscription cs;
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dl.add(cs);
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cs.add([=](){
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dl.unsubscribe();
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lc();
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});
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return make_subscriber<value_type>(cs, this_type(d));
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}
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};
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template<class Subscriber>
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auto operator()(Subscriber dest) const
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-> decltype(finally_observer<Subscriber>::make(std::move(dest), last_call)) {
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return finally_observer<Subscriber>::make(std::move(dest), last_call);
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}
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};
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}
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/*! @copydoc rx-finally.hpp
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*/
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template<class... AN>
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auto finally(AN&&... an)
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-> operator_factory<finally_tag, AN...> {
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return operator_factory<finally_tag, AN...>(std::make_tuple(std::forward<AN>(an)...));
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}
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}
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template<>
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struct member_overload<finally_tag>
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{
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template<class Observable, class LastCall,
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class SourceValue = rxu::value_type_t<Observable>,
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class Enabled = rxu::enable_if_all_true_type_t<
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is_observable<Observable>>,
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class Finally = rxo::detail::finally<SourceValue, rxu::decay_t<LastCall>>>
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static auto member(Observable&& o, LastCall&& lc)
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-> decltype(o.template lift<SourceValue>(Finally(std::forward<LastCall>(lc)))) {
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return o.template lift<SourceValue>(Finally(std::forward<LastCall>(lc)));
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}
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template<class... AN>
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static operators::detail::finally_invalid_t<AN...> member(const AN&...) {
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std::terminate();
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return {};
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static_assert(sizeof...(AN) == 10000, "finally takes (LastCall)");
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}
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};
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}
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#endif
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