feat add rxcpp

3party/rxcpp/operators/rx-finally.hpp

@@ -0,0 +1,134 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
+
+#pragma once
+
+/*! \file rx-finally.hpp
+
+    \brief Add a new action at the end of the new observable that is returned.
+
+    \tparam LastCall the type of the action function
+
+    \param lc the action function
+
+    \return Observable that emits the same items as the source observable, then invokes the given action.
+
+    \sample
+    \snippet finally.cpp finally sample
+    \snippet output.txt finally sample
+
+    If the source observable generates an error, the final action is still being called:
+    \snippet finally.cpp error finally sample
+    \snippet output.txt error finally sample
+*/
+
+#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... AN>
+struct finally_invalid_arguments {};
+
+template<class... AN>
+struct finally_invalid : public rxo::operator_base<finally_invalid_arguments<AN...>> {
+    using type = observable<finally_invalid_arguments<AN...>, finally_invalid<AN...>>;
+};
+template<class... AN>
+using finally_invalid_t = typename finally_invalid<AN...>::type;
+
+template<class T, class LastCall>
+struct finally
+{
+    typedef rxu::decay_t<T> source_value_type;
+    typedef rxu::decay_t<LastCall> 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 rxu::decay_t<Subscriber> 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(rxu::error_ptr e) const {
+            dest.on_error(e);
+        }
+        void on_completed() const {
+            dest.on_completed();
+        }
+
+        static subscriber<value_type, observer_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);
+    }
+};
+
+}
+
+/*! @copydoc rx-finally.hpp
+*/
+template<class... AN>
+auto finally(AN&&... an)
+    ->      operator_factory<finally_tag, AN...> {
+     return operator_factory<finally_tag, AN...>(std::make_tuple(std::forward<AN>(an)...));
+}
+
+}
+
+template<>
+struct member_overload<finally_tag>
+{
+    template<class Observable, class LastCall,
+        class SourceValue = rxu::value_type_t<Observable>,
+        class Enabled = rxu::enable_if_all_true_type_t<
+            is_observable<Observable>>,
+        class Finally = rxo::detail::finally<SourceValue, rxu::decay_t<LastCall>>>
+    static auto member(Observable&& o, LastCall&& lc)
+        -> decltype(o.template lift<SourceValue>(Finally(std::forward<LastCall>(lc)))) {
+        return      o.template lift<SourceValue>(Finally(std::forward<LastCall>(lc)));
+    }
+
+    template<class... AN>
+    static operators::detail::finally_invalid_t<AN...> member(const AN&...) {
+        std::terminate();
+        return {};
+        static_assert(sizeof...(AN) == 10000, "finally takes (LastCall)");
+    }
+};
+
+}
+
+#endif