1 /** 2 * Copyright (c) 2021-2022 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 LIBPANDABASE_UTILS_BIT_HELPERS_H 17 #define LIBPANDABASE_UTILS_BIT_HELPERS_H 18 19 #include "macros.h" 20 21 #include <cstddef> 22 #include <cstdint> 23 24 #include <limits> 25 #include <type_traits> 26 27 namespace panda::helpers { 28 29 template <size_t width> 30 struct UnsignedTypeHelper { 31 using type = std::conditional_t< 32 width <= std::numeric_limits<uint8_t>::digits, uint8_t, 33 std::conditional_t< 34 width <= std::numeric_limits<uint16_t>::digits, uint16_t, 35 std::conditional_t<width <= std::numeric_limits<uint32_t>::digits, uint32_t, 36 std::conditional_t<width <= std::numeric_limits<uint64_t>::digits, uint64_t, void>>>>; 37 }; 38 39 template <size_t width> 40 using UnsignedTypeHelperT = typename UnsignedTypeHelper<width>::type; 41 42 template <size_t width, bool is_signed> 43 struct TypeHelper { 44 using type = 45 std::conditional_t<is_signed, std::make_signed_t<UnsignedTypeHelperT<width>>, UnsignedTypeHelperT<width>>; 46 }; 47 48 template <size_t width, bool is_signed> 49 using TypeHelperT = typename TypeHelper<width, is_signed>::type; 50 51 } // namespace panda::helpers 52 53 #endif // LIBPANDABASE_UTILS_BIT_HELPERS_H 54