91 lines
2.5 KiB
C++
91 lines
2.5 KiB
C++
/*
|
|
* Copyright (c) Facebook, Inc. and its affiliates.
|
|
*
|
|
* 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
|
|
*
|
|
* http://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>
|
|
#include <type_traits>
|
|
|
|
// include or backport:
|
|
// * std::byte
|
|
// * std::to_integer
|
|
|
|
#if __cpp_lib_byte >= 201603
|
|
|
|
namespace folly {
|
|
|
|
using std::byte;
|
|
using std::to_integer;
|
|
|
|
} // namespace folly
|
|
|
|
#else
|
|
|
|
namespace folly {
|
|
|
|
enum class byte : unsigned char {};
|
|
|
|
constexpr byte operator~(byte b) noexcept {
|
|
return static_cast<byte>(~static_cast<unsigned>(b));
|
|
}
|
|
constexpr byte operator&(byte b0, byte b1) noexcept {
|
|
return static_cast<byte>(
|
|
static_cast<unsigned>(b0) & static_cast<unsigned>(b1));
|
|
}
|
|
constexpr byte operator|(byte b0, byte b1) noexcept {
|
|
return static_cast<byte>(
|
|
static_cast<unsigned>(b0) | static_cast<unsigned>(b1));
|
|
}
|
|
constexpr byte operator^(byte b0, byte b1) noexcept {
|
|
return static_cast<byte>(
|
|
static_cast<unsigned>(b0) ^ static_cast<unsigned>(b1));
|
|
}
|
|
template <typename I, std::enable_if_t<std::is_integral<I>::value, int> = 0>
|
|
constexpr byte operator<<(byte b, I shift) noexcept {
|
|
return static_cast<byte>(static_cast<unsigned>(b) << shift);
|
|
}
|
|
template <typename I, std::enable_if_t<std::is_integral<I>::value, int> = 0>
|
|
constexpr byte operator>>(byte b, I shift) noexcept {
|
|
return static_cast<byte>(static_cast<unsigned>(b) >> shift);
|
|
}
|
|
|
|
constexpr byte& operator&=(byte& b, byte o) noexcept {
|
|
return b = b & o;
|
|
}
|
|
constexpr byte& operator|=(byte& b, byte o) noexcept {
|
|
return b = b | o;
|
|
}
|
|
constexpr byte& operator^=(byte& b, byte o) noexcept {
|
|
return b = b ^ o;
|
|
}
|
|
template <typename I, std::enable_if_t<std::is_integral<I>::value, int> = 0>
|
|
constexpr byte& operator<<=(byte& b, I shift) noexcept {
|
|
return b = b << shift;
|
|
}
|
|
template <typename I, std::enable_if_t<std::is_integral<I>::value, int> = 0>
|
|
constexpr byte& operator>>=(byte& b, I shift) noexcept {
|
|
return b = b >> shift;
|
|
}
|
|
|
|
template <typename I, std::enable_if_t<std::is_integral<I>::value, int> = 0>
|
|
constexpr I to_integer(byte b) noexcept {
|
|
return static_cast<I>(b);
|
|
}
|
|
|
|
} // namespace folly
|
|
|
|
#endif
|