1 // Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
2
3 #pragma once
4
5 /*! \file rx-connect_forever.hpp
6
7 \brief takes a connectable_observable source and calls connect during the construction of the expression.
8 This means that the source starts running without any subscribers and continues running after all subscriptions have been unsubscribed.
9
10 \return An observable that emitting the items from its source.
11 */
12
13 #if !defined(RXCPP_OPERATORS_RX_CONNECT_FOREVER_HPP)
14 #define RXCPP_OPERATORS_RX_CONNECT_FOREVER_HPP
15
16 #include "../rx-includes.hpp"
17
18 namespace rxcpp {
19
20 namespace operators {
21
22 namespace detail {
23
24 template<class... AN>
25 struct connect_forever_invalid_arguments {};
26
27 template<class... AN>
28 struct connect_forever_invalid : public rxo::operator_base<connect_forever_invalid_arguments<AN...>> {
29 using type = observable<connect_forever_invalid_arguments<AN...>, connect_forever_invalid<AN...>>;
30 };
31 template<class... AN>
32 using connect_forever_invalid_t = typename connect_forever_invalid<AN...>::type;
33
34 template<class T, class ConnectableObservable>
35 struct connect_forever : public operator_base<T>
36 {
37 typedef rxu::decay_t<ConnectableObservable> source_type;
38
39 source_type source;
40
connect_foreverrxcpp::operators::detail::connect_forever41 explicit connect_forever(source_type o)
42 : source(std::move(o))
43 {
44 source.connect();
45 }
46
47 template<class Subscriber>
on_subscriberxcpp::operators::detail::connect_forever48 void on_subscribe(Subscriber&& o) const {
49 source.subscribe(std::forward<Subscriber>(o));
50 }
51 };
52
53 }
54
55 /*! @copydoc rx-connect_forever.hpp
56 */
57 template<class... AN>
connect_forever(AN &&...an)58 auto connect_forever(AN&&... an)
59 -> operator_factory<connect_forever_tag, AN...> {
60 return operator_factory<connect_forever_tag, AN...>(std::make_tuple(std::forward<AN>(an)...));
61 }
62
63 }
64
65 template<>
66 struct member_overload<connect_forever_tag>
67 {
68 template<class ConnectableObservable,
69 class Enabled = rxu::enable_if_all_true_type_t<
70 is_connectable_observable<ConnectableObservable>>,
71 class SourceValue = rxu::value_type_t<ConnectableObservable>,
72 class ConnectForever = rxo::detail::connect_forever<SourceValue, rxu::decay_t<ConnectableObservable>>,
73 class Value = rxu::value_type_t<ConnectForever>,
74 class Result = observable<Value, ConnectForever>
75 >
memberrxcpp::member_overload76 static Result member(ConnectableObservable&& o) {
77 return Result(ConnectForever(std::forward<ConnectableObservable>(o)));
78 }
79
80 template<class... AN>
memberrxcpp::member_overload81 static operators::detail::connect_forever_invalid_t<AN...> member(AN...) {
82 std::terminate();
83 return {};
84 static_assert(sizeof...(AN) == 10000, "connect_forever takes no arguments");
85 }
86 };
87
88 }
89
90 #endif
91