feat add rxcpp

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

@@ -0,0 +1,180 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
+
+#pragma once
+
+/*! \file rx-window.hpp
+
+    \brief Return an observable that emits connected, non-overlapping windows, each containing at most count items from the source observable.
+           If the skip parameter is set, return an observable that emits windows every skip items containing at most count items from the source observable.
+
+    \param count  the maximum size of each window before it should be completed
+    \param skip   how many items need to be skipped before starting a new window
+
+    \return  Observable that emits connected, non-overlapping windows, each containing at most count items from the source observable.
+             If the skip parameter is set, return an Observable that emits windows every skip items containing at most count items from the source observable.
+
+    \sample
+    \snippet window.cpp window count+skip sample
+    \snippet output.txt window count+skip sample
+
+    \sample
+    \snippet window.cpp window count sample
+    \snippet output.txt window count sample
+*/
+
+#if !defined(RXCPP_OPERATORS_RX_WINDOW_HPP)
+#define RXCPP_OPERATORS_RX_WINDOW_HPP
+
+#include "../rx-includes.hpp"
+
+namespace rxcpp {
+
+namespace operators {
+
+namespace detail {
+
+template<class... AN>
+struct window_invalid_arguments {};
+
+template<class... AN>
+struct window_invalid : public rxo::operator_base<window_invalid_arguments<AN...>> {
+    using type = observable<window_invalid_arguments<AN...>, window_invalid<AN...>>;
+};
+template<class... AN>
+using window_invalid_t = typename window_invalid<AN...>::type;
+
+template<class T>
+struct window
+{
+    typedef rxu::decay_t<T> source_value_type;
+    typedef observable<source_value_type> value_type;
+
+    struct window_values
+    {
+        window_values(int c, int s)
+            : count(c)
+            , skip(s)
+        {
+        }
+        int count;
+        int skip;
+    };
+
+    window_values initial;
+
+    window(int count, int skip)
+        : initial(count, skip)
+    {
+    }
+
+    template<class Subscriber>
+    struct window_observer : public window_values
+    {
+        typedef window_observer<Subscriber> this_type;
+        typedef rxu::decay_t<T> value_type;
+        typedef rxu::decay_t<Subscriber> dest_type;
+        typedef observer<T, this_type> observer_type;
+        dest_type dest;
+        mutable int cursor;
+        mutable std::deque<rxcpp::subjects::subject<T>> subj;
+
+        window_observer(dest_type d, window_values v)
+            : window_values(v)
+            , dest(std::move(d))
+            , cursor(0)
+        {
+            subj.push_back(rxcpp::subjects::subject<T>());
+            dest.on_next(subj[0].get_observable().as_dynamic());
+        }
+        void on_next(T v) const {
+            for (auto s : subj) {
+                s.get_subscriber().on_next(v);
+            }
+
+            int c = cursor - this->count + 1;
+            if (c >= 0 && c % this->skip == 0) {
+                subj[0].get_subscriber().on_completed();
+                subj.pop_front();
+            }
+
+            if (++cursor % this->skip == 0) {
+                subj.push_back(rxcpp::subjects::subject<T>());
+                dest.on_next(subj[subj.size() - 1].get_observable().as_dynamic());
+            }
+        }
+
+        void on_error(rxu::error_ptr e) const {
+            for (auto s : subj) {
+                s.get_subscriber().on_error(e);
+            }
+            dest.on_error(e);
+        }
+
+        void on_completed() const {
+            for (auto s : subj) {
+                s.get_subscriber().on_completed();
+            }
+            dest.on_completed();
+        }
+
+        static subscriber<T, observer_type> make(dest_type d, window_values v) {
+            auto cs = d.get_subscription();
+            return make_subscriber<T>(std::move(cs), observer_type(this_type(std::move(d), std::move(v))));
+        }
+    };
+
+    template<class Subscriber>
+    auto operator()(Subscriber dest) const
+        -> decltype(window_observer<Subscriber>::make(std::move(dest), initial)) {
+        return      window_observer<Subscriber>::make(std::move(dest), initial);
+    }
+};
+
+}
+
+/*! @copydoc rx-window.hpp
+*/
+template<class... AN>
+auto window(AN&&... an)
+    ->      operator_factory<window_tag, AN...> {
+     return operator_factory<window_tag, AN...>(std::make_tuple(std::forward<AN>(an)...));
+}
+
+}
+
+template<>
+struct member_overload<window_tag>
+{
+    template<class Observable,
+        class Enabled = rxu::enable_if_all_true_type_t<
+            is_observable<Observable>>,
+        class SourceValue = rxu::value_type_t<Observable>,
+        class Window = rxo::detail::window<SourceValue>,
+        class Value = rxu::value_type_t<Window>>
+    static auto member(Observable&& o, int count, int skip)
+        -> decltype(o.template lift<Value>(Window(count, skip))) {
+        return      o.template lift<Value>(Window(count, skip));
+    }
+
+     template<class Observable,
+        class Enabled = rxu::enable_if_all_true_type_t<
+            is_observable<Observable>>,
+        class SourceValue = rxu::value_type_t<Observable>,
+        class Window = rxo::detail::window<SourceValue>,
+        class Value = rxu::value_type_t<Window>>
+    static auto member(Observable&& o, int count)
+        -> decltype(o.template lift<Value>(Window(count, count))) {
+        return      o.template lift<Value>(Window(count, count));
+    }
+
+    template<class... AN>
+    static operators::detail::window_invalid_t<AN...> member(AN...) {
+        std::terminate();
+        return {};
+        static_assert(sizeof...(AN) == 10000, "window takes (Count, optional Skip)");
+    }
+};
+
+}
+
+#endif