Taylor Brandstetter | e68b6c9 | 2017-10-05 09:13:55 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2017 The WebRTC Project Authors. All rights reserved. |
| 3 | * |
| 4 | * Use of this source code is governed by a BSD-style license |
| 5 | * that can be found in the LICENSE file in the root of the source |
| 6 | * tree. An additional intellectual property rights grant can be found |
| 7 | * in the file PATENTS. All contributing project authors may |
| 8 | * be found in the AUTHORS file in the root of the source tree. |
| 9 | */ |
| 10 | |
| 11 | #ifndef RTC_BASE_SIGSLOTREPEATER_H__ |
| 12 | #define RTC_BASE_SIGSLOTREPEATER_H__ |
| 13 | |
| 14 | // repeaters are both signals and slots, which are designed as intermediate |
| 15 | // pass-throughs for signals and slots which don't know about each other (for |
| 16 | // modularity or encapsulation). This eliminates the need to declare a signal |
| 17 | // handler whose sole purpose is to fire another signal. The repeater connects |
| 18 | // to the originating signal using the 'repeat' method. When the repeated |
| 19 | // signal fires, the repeater will also fire. |
| 20 | // |
| 21 | // TODO(deadbeef): Actually use this, after we decide on some style points on |
| 22 | // using signals, so it doesn't get deleted again. |
| 23 | |
| 24 | #include "rtc_base/sigslot.h" |
| 25 | |
| 26 | namespace sigslot { |
| 27 | |
| 28 | template <class mt_policy, typename... Args> |
| 29 | class repeater_with_thread_policy |
| 30 | : public signal_with_thread_policy<mt_policy, Args...>, |
| 31 | public has_slots<mt_policy> { |
| 32 | private: |
| 33 | // These typedefs are just to make the code below more readable. Code using |
| 34 | // repeaters shouldn't need to reference these types directly. |
| 35 | typedef signal_with_thread_policy<mt_policy, Args...> base_type; |
| 36 | typedef repeater_with_thread_policy<mt_policy, Args...> this_type; |
| 37 | |
| 38 | public: |
| 39 | repeater_with_thread_policy() {} |
| 40 | repeater_with_thread_policy(const this_type& s) : base_type(s) {} |
| 41 | |
| 42 | void reemit(Args... args) { base_type::emit(args...); } |
| 43 | void repeat(base_type& s) { s.connect(this, &this_type::reemit); } |
| 44 | void stop(base_type& s) { s.disconnect(this); } |
| 45 | }; |
| 46 | |
| 47 | // Alias with default thread policy. Needed because both default arguments |
| 48 | // and variadic template arguments must go at the end of the list, so we |
| 49 | // can't have both at once. |
| 50 | template <typename... Args> |
| 51 | using repeater = |
| 52 | repeater_with_thread_policy<SIGSLOT_DEFAULT_MT_POLICY, Args...>; |
| 53 | |
| 54 | } // namespace sigslot |
| 55 | |
| 56 | #endif // RTC_BASE_SIGSLOTREPEATER_H__ |