1 /*
2  * Copyright (c) 2023 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 RS_CORE_PIPELINE_RCD_ANY_H
17 #define RS_CORE_PIPELINE_RCD_ANY_H
18 #include <functional>
19 #include <mutex>
20 #include <thread>
21 #include <memory>
22 #include <iostream>
23 
24 struct RsAny {
RsAnyRsAny25     RsAny(void) {}
RsAnyRsAny26     RsAny(const RsAny &that) : m_ptr(that.Clone()) {}
RsAnyRsAny27     RsAny(RsAny &&that) : m_ptr(std::move(that.m_ptr)) {}
28 
29     template<typename U, class = typename std::enable_if<
RsAnyRsAny30         !std::is_same<typename std::decay<U>::type, RsAny>::value, U>::type> RsAny(U &&value) : m_ptr(
31         new Derived<typename std::decay<U>::type>(std::forward<U>(value))) {}
32 
IsNULLRsAny33     bool IsNULL() const { return !bool(m_ptr); }
34 
35     template<class U>
anyCastRsAny36     U& anyCast()
37     {
38         auto derived = reinterpret_cast<Derived<U>*>(m_ptr.get());
39         return derived->m_value;
40     }
41 
42     template<typename... Args>
SendRsAny43     void Send(Args... args)
44     {
45         std::lock_guard<std::mutex> lock(m_mutex);
46         auto f = anyCast<std::function<void(Args...)>>();
47         f(args...);
48     }
49 
50     RsAny& operator=(const RsAny &a)
51     {
52         if (m_ptr == a.m_ptr) {
53             return *this;
54         }
55         m_ptr = a.Clone();
56         return *this;
57     }
58 
59 private:
60     std::mutex m_mutex;
61     struct Base;
62     using BaseUPtr = std::unique_ptr<Base>;
63     struct Base {
~BaseRsAny::Base64         virtual ~Base() {}
65         virtual BaseUPtr Clone() const = 0;
66     };
67 
68     template<typename T>
69     struct Derived : Base {
70         template<typename U>
DerivedRsAny::Derived71         Derived(U&& value) : m_value(std::forward<U>(value)) {}
72 
CloneRsAny::Derived73         BaseUPtr Clone() const
74         {
75             return BaseUPtr(new Derived<T>(m_value));
76         }
77 
78         T m_value;
79     };
80 
81     BaseUPtr m_ptr;
82 
83 public:
CloneRsAny84     BaseUPtr Clone() const
85     {
86         if (m_ptr != nullptr) {
87             return m_ptr->Clone();
88         }
89         return nullptr;
90     }
91 };
92 #endif