feat add rxcpp

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

@@ -0,0 +1,145 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
+
+#pragma once
+
+/*! \file rx-map.hpp
+
+    \brief For each item from this observable use Selector to produce an item to emit from the new observable that is returned.
+
+    \tparam Selector the type of the transforming function
+
+    \param s the selector function
+
+    \return  Observable that emits the items from the source observable, transformed by the specified function.
+
+    \sample
+    \snippet map.cpp map sample
+    \snippet output.txt map sample
+*/
+
+#if !defined(RXCPP_OPERATORS_RX_MAP_HPP)
+#define RXCPP_OPERATORS_RX_MAP_HPP
+
+#include "../rx-includes.hpp"
+
+namespace rxcpp {
+
+namespace operators {
+
+namespace detail {
+
+template<class... AN>
+struct map_invalid_arguments {};
+
+template<class... AN>
+struct map_invalid : public rxo::operator_base<map_invalid_arguments<AN...>> {
+    using type = observable<map_invalid_arguments<AN...>, map_invalid<AN...>>;
+};
+template<class... AN>
+using map_invalid_t = typename map_invalid<AN...>::type;
+
+template<class T, class Selector>
+struct map
+{
+    typedef rxu::decay_t<T> source_value_type;
+    typedef rxu::decay_t<Selector> select_type;
+    typedef decltype((*(select_type*)nullptr)(*(source_value_type*)nullptr)) value_type;
+    select_type selector;
+
+    map(select_type s)
+        : selector(std::move(s))
+    {
+    }
+
+    template<class Subscriber>
+    struct map_observer
+    {
+        typedef map_observer<Subscriber> this_type;
+        typedef decltype((*(select_type*)nullptr)(*(source_value_type*)nullptr)) value_type;
+        typedef rxu::decay_t<Subscriber> dest_type;
+        typedef observer<source_value_type, this_type> observer_type;
+        dest_type dest;
+        mutable select_type selector;
+
+        map_observer(dest_type d, select_type s)
+            : dest(std::move(d))
+            , selector(std::move(s))
+        {
+        }
+        template<class Value>
+        void on_next(Value&& v) const {
+            auto selected = on_exception(
+                [&](){
+                    return this->selector(std::forward<Value>(v));},
+                dest);
+            if (selected.empty()) {
+                return;
+            }
+            dest.on_next(std::move(selected.get()));
+        }
+        void on_error(rxu::error_ptr e) const {
+            dest.on_error(e);
+        }
+        void on_completed() const {
+            dest.on_completed();
+        }
+
+        static subscriber<source_value_type, observer_type> make(dest_type d, select_type s) {
+            auto cs = d.get_subscription();
+            return make_subscriber<source_value_type>(std::move(cs), observer_type(this_type(std::move(d), std::move(s))));
+        }
+    };
+
+    template<class Subscriber>
+    auto operator()(Subscriber dest) const
+        -> decltype(map_observer<Subscriber>::make(std::move(dest), selector)) {
+        return      map_observer<Subscriber>::make(std::move(dest), selector);
+    }
+};
+
+}
+
+/*! @copydoc rx-map.hpp
+*/
+template<class... AN>
+auto map(AN&&... an)
+    -> operator_factory<map_tag, AN...> {
+    return operator_factory<map_tag, AN...>(std::make_tuple(std::forward<AN>(an)...));
+}
+
+/*! @copydoc rx-map.hpp
+*/
+template<class... AN>
+auto transform(AN&&... an)
+    -> operator_factory<map_tag, AN...> {
+    return operator_factory<map_tag, AN...>(std::make_tuple(std::forward<AN>(an)...));
+}
+
+}
+
+template<>
+struct member_overload<map_tag>
+{
+    template<class Observable, class Selector,
+        class Enabled = rxu::enable_if_all_true_type_t<
+            is_observable<Observable>>,
+        class ResolvedSelector = rxu::decay_t<Selector>,
+        class SourceValue = rxu::value_type_t<Observable>,
+        class Map = rxo::detail::map<SourceValue, ResolvedSelector>,
+        class Value = rxu::value_type_t<Map>>
+    static auto member(Observable&& o, Selector&& s)
+        -> decltype(o.template lift<Value>(Map(std::forward<Selector>(s)))) {
+        return      o.template lift<Value>(Map(std::forward<Selector>(s)));
+    }
+
+    template<class... AN>
+    static operators::detail::map_invalid_t<AN...> member(const AN...) {
+        std::terminate();
+        return {};
+        static_assert(sizeof...(AN) == 10000, "map takes Selector");
+    }
+};
+
+}
+
+#endif