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