1 /*
2  * Copyright (c) 2024 Huawei Device Co., Ltd.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at
6  *
7  *     http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 
16 #ifndef META_INTERFACE_SIMPLE_EVENT_H
17 #define META_INTERFACE_SIMPLE_EVENT_H
18 
19 #include <meta/base/meta_types.h>
20 #include <meta/interface/intf_event.h>
21 
22 META_BEGIN_NAMESPACE()
23 
24 /**
25  * @brief Helper class to define event types easily.
26  * Example:
27  *     struct IOnEventInfo {
28  *         constexpr static BASE_NS::Uid UID { "uid..." };
29  *     };
30  *     using IOnEvent = META_NS::SimpleEvent<IOnEventInfo, void(int myparameter)>;
31  * IOnEvent is event type that can be used with META(_IMPLEMENT)_EVENT macros.
32  */
33 template<typename MyEvent, typename Signature = void()>
34 class SimpleEvent;
35 
36 template<typename MyEvent, typename... Args>
37 class SimpleEvent<MyEvent, void(Args...)> : public IEventCallable<MyEvent, void, Args...> {
38 public:
39     constexpr static char const *NAME { MyEvent::NAME };
40 };
41 
42 // NOLINTBEGIN(readability-identifier-naming)
43 /**
44  * @brief Check if type is an event.
45  */
46 template<typename Type>
47 constexpr bool IsEvent_v = BASE_NS::is_convertible_v<const Type*, const IEvent*>;
48 // NOLINTEND(readability-identifier-naming)
49 
50 META_END_NAMESPACE()
51 
52 #endif
53