| // Copyright 2020 The Pigweed Authors |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| // use this file except in compliance with the License. You may obtain a copy of |
| // the License at |
| // |
| // https://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| // License for the specific language governing permissions and limitations under |
| // the License. |
| #pragma once |
| |
| #include <cstddef> |
| |
| // Defines the std::byte type if it is not present. |
| #ifndef __cpp_lib_byte |
| |
| namespace std { |
| |
| enum class byte : unsigned char {}; |
| |
| template <typename I> |
| constexpr I to_integer(byte b) noexcept { |
| return I(b); |
| } |
| |
| constexpr byte operator|(byte l, byte r) noexcept { |
| return byte(static_cast<unsigned int>(l) | static_cast<unsigned int>(r)); |
| } |
| |
| constexpr byte operator&(byte l, byte r) noexcept { |
| return byte(static_cast<unsigned int>(l) & static_cast<unsigned int>(r)); |
| } |
| |
| constexpr byte operator^(byte l, byte r) noexcept { |
| return byte(static_cast<unsigned int>(l) ^ static_cast<unsigned int>(r)); |
| } |
| |
| constexpr byte operator~(byte b) noexcept { |
| return byte(~static_cast<unsigned int>(b)); |
| } |
| |
| template <typename I> |
| constexpr byte operator<<(byte b, I shift) noexcept { |
| return byte(static_cast<unsigned int>(b) << shift); |
| } |
| |
| template <typename I> |
| constexpr byte operator>>(byte b, I shift) noexcept { |
| return byte(static_cast<unsigned int>(b) >> shift); |
| } |
| |
| #if __cpp_constexpr >= 201304L |
| |
| constexpr byte& operator|=(byte& l, byte r) noexcept { return l = l | r; } |
| constexpr byte& operator&=(byte& l, byte r) noexcept { return l = l & r; } |
| constexpr byte& operator^=(byte& l, byte r) noexcept { return l = l ^ r; } |
| |
| #else // For C++11 compatiblity, these operators cannot be constexpr. |
| |
| inline byte& operator|=(byte& l, byte r) noexcept { return l = l | r; } |
| inline byte& operator&=(byte& l, byte r) noexcept { return l = l & r; } |
| inline byte& operator^=(byte& l, byte r) noexcept { return l = l ^ r; } |
| |
| #endif // __cpp_constexpr >= 201304L |
| |
| template <typename I> |
| inline byte& operator<<=(byte& b, I shift) noexcept { |
| return b = b << shift; |
| } |
| |
| template <typename I> |
| inline byte& operator>>=(byte& b, I shift) noexcept { |
| return b = b >> shift; |
| } |
| |
| } // namespace std |
| |
| #endif // __cpp_lib_byte |