1 /* 2 * Copyright (c) 2022 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 TRAITS_UTIL_H 17 #define TRAITS_UTIL_H 18 19 #include <optional> 20 #include <string> 21 #include <vector> 22 23 namespace Updater { 24 namespace Detail { 25 template<typename T> 26 inline constexpr bool G_IS_NUM = std::is_integral_v<T> && !std::is_same_v<T, bool>; 27 28 template<typename T> 29 inline constexpr bool G_IS_BOOL = std::is_same_v<bool, T>; 30 31 template<typename T> 32 inline constexpr bool G_IS_STR = (std::is_same_v<char *, std::decay_t<T>> || 33 std::is_same_v<const char *, std::decay_t<T>> || std::is_same_v<std::string, T>); 34 35 template<typename T> 36 inline constexpr bool G_IS_PRINTABLE = (G_IS_NUM<T> || G_IS_BOOL<T> || G_IS_STR<T>); 37 38 template<typename T> 39 inline constexpr bool G_IS_BASE_TYPE = (G_IS_NUM<T> || G_IS_BOOL<T> || G_IS_STR<T>); 40 41 template<typename T> 42 struct IsVector : std::false_type {}; 43 44 template<typename T> 45 struct IsVector<std::vector<T>> : std::true_type {}; 46 47 template<typename T> 48 constexpr bool G_IS_VECTOR = IsVector<T>::value; 49 50 template<bool b, typename T> 51 using isMatch = typename std::enable_if_t<b, T>; 52 53 template<typename T> 54 using RemoveCvRef = std::remove_cv_t<std::remove_reference_t<T>>; 55 56 template<typename T> 57 struct StandardTypeHelper { 58 static_assert(G_IS_BASE_TYPE<T>); 59 using type = std::conditional_t<G_IS_NUM<T>, int, std::conditional_t<G_IS_STR<T>, std::string, bool>>; 60 }; 61 62 template<typename T> 63 using StandardType = typename StandardTypeHelper<T>::type; 64 65 template<typename T> 66 using OptStandardType = std::optional<StandardType<RemoveCvRef<T>>>; 67 68 template<std::size_t idx, typename...T> 69 inline auto &Get(T &&...t) 70 { 71 return std::get<idx>(std::forward_as_tuple(t...)); 72 } 73 } 74 } 75 #endif 76