1 /*
2 * Copyright (c) 2021 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 FOUNDATION_ACE_FRAMEWORKS_BRIDGE_COMMON_UTILS_FUNCTION_TRAITS_H
17 #define FOUNDATION_ACE_FRAMEWORKS_BRIDGE_COMMON_UTILS_FUNCTION_TRAITS_H
18
19 #include <tuple>
20
21 template<typename T>
22 struct function_traits;
23
24 template<typename Class, typename ReturnType, typename... Args>
25 struct function_traits<ReturnType (Class::*)(Args...)> {
26 static constexpr const size_t argc = sizeof...(Args);
27 typedef ReturnType returnType;
28 using ArgumentPack = std::tuple<Args...>;
29 template<size_t i>
30 struct argv {
31 typedef typename std::tuple_element<i, ArgumentPack>::type type;
32 };
33 };
34
35 namespace FunctionUtils {
36
37 template<typename C, typename F, typename T, size_t... I>
CallMemberFunction(C* instance, F func, T&& tuple, std::index_sequence<I...>)38 auto CallMemberFunction(C* instance, F func, T&& tuple, std::index_sequence<I...>)
39 {
40 return (instance->*func)(std::get<I>(std::forward<T>(tuple))...);
41 }
42
43 template<typename C, typename R, typename Tuple, typename... Types>
CallMemberFunction(C* instance, R (C::*func)(Types...), Tuple&& tup)44 auto CallMemberFunction(C* instance, R (C::*func)(Types...), Tuple&& tup)
45 {
46 return CallMemberFunction(instance, func, std::forward<Tuple>(tup), std::make_index_sequence<sizeof...(Types)> {});
47 }
48
49 template<typename F, typename T, size_t... I>
CallStaticMemberFunction(F func, T&& tuple, std::index_sequence<I...>)50 auto CallStaticMemberFunction(F func, T&& tuple, std::index_sequence<I...>)
51 {
52 return func(std::get<I>(std::forward<T>(tuple))...);
53 }
54
55 template<typename R, typename Tuple, typename... Types>
CallStaticMemberFunction(R (func)Types...), Tuple&& tup)56 auto CallStaticMemberFunction(R (*func)(Types...), Tuple&& tup)
57 {
58 return CallStaticMemberFunction(func, std::forward<Tuple>(tup), std::make_index_sequence<sizeof...(Types)> {});
59 }
60
61 template<class T, class Tuple, size_t... Is>
ConstructFromTuple(Tuple&& tuple, std::index_sequence<Is...>)62 T* ConstructFromTuple(Tuple&& tuple, std::index_sequence<Is...>)
63 {
64 return new T { std::get<Is>(std::forward<Tuple>(tuple))... };
65 }
66
67 template<class T, class Tuple>
ConstructFromTuple(Tuple&& tuple)68 T* ConstructFromTuple(Tuple&& tuple)
69 {
70 return ConstructFromTuple<T>(
71 std::forward<Tuple>(tuple), std::make_index_sequence<std::tuple_size<std::decay_t<Tuple>>::value> {});
72 }
73
74 }; // namespace FunctionUtils
75
76 #endif // FOUNDATION_ACE_FRAMEWORKS_BRIDGE_COMMON_UTILS_FUNCTION_TRAITS_H