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We've started using `_LIBCPP_BEGIN_NAMESPACE_STD` and `_LIBCPP_END_NAMESPACE_STD` for more than just the namespace for a while now. For example, we're using it to add visibility annotations to types. This works very well and avoids a bunch of annotations, but doesn't work for the few places where we have an unversioned namespace. This adds `_LIBCPP_BEGIN_UNVERSIONED_NAMESPACE_STD` and `_LIBCPP_END_UNVERSIONED_NAMESPACE_STD` to make it simpler to add new annotations consistently across the library as well as making it more explicit that the unversioned namespace is indeed intended.
86 lines
3.2 KiB
C++
86 lines
3.2 KiB
C++
//===---------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===---------------------------------------------------------------------===//
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#ifndef _LIBCPP___CSTDDEF_BYTE_H
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#define _LIBCPP___CSTDDEF_BYTE_H
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#include <__config>
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#include <__fwd/byte.h>
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#include <__type_traits/enable_if.h>
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#include <__type_traits/is_integral.h>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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#if _LIBCPP_STD_VER >= 17
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_LIBCPP_BEGIN_UNVERSIONED_NAMESPACE_STD
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enum class byte : unsigned char {};
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_LIBCPP_HIDE_FROM_ABI inline constexpr byte operator|(byte __lhs, byte __rhs) noexcept {
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return static_cast<byte>(
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static_cast<unsigned char>(static_cast<unsigned int>(__lhs) | static_cast<unsigned int>(__rhs)));
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}
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_LIBCPP_HIDE_FROM_ABI inline constexpr byte& operator|=(byte& __lhs, byte __rhs) noexcept {
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return __lhs = __lhs | __rhs;
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}
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_LIBCPP_HIDE_FROM_ABI inline constexpr byte operator&(byte __lhs, byte __rhs) noexcept {
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return static_cast<byte>(
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static_cast<unsigned char>(static_cast<unsigned int>(__lhs) & static_cast<unsigned int>(__rhs)));
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}
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_LIBCPP_HIDE_FROM_ABI inline constexpr byte& operator&=(byte& __lhs, byte __rhs) noexcept {
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return __lhs = __lhs & __rhs;
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}
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_LIBCPP_HIDE_FROM_ABI inline constexpr byte operator^(byte __lhs, byte __rhs) noexcept {
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return static_cast<byte>(
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static_cast<unsigned char>(static_cast<unsigned int>(__lhs) ^ static_cast<unsigned int>(__rhs)));
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}
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_LIBCPP_HIDE_FROM_ABI inline constexpr byte& operator^=(byte& __lhs, byte __rhs) noexcept {
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return __lhs = __lhs ^ __rhs;
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}
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_LIBCPP_HIDE_FROM_ABI inline constexpr byte operator~(byte __b) noexcept {
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return static_cast<byte>(static_cast<unsigned char>(~static_cast<unsigned int>(__b)));
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}
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template <class _Integer, __enable_if_t<is_integral<_Integer>::value, int> = 0>
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_LIBCPP_HIDE_FROM_ABI constexpr byte& operator<<=(byte& __lhs, _Integer __shift) noexcept {
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return __lhs = __lhs << __shift;
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}
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template <class _Integer, __enable_if_t<is_integral<_Integer>::value, int> = 0>
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_LIBCPP_HIDE_FROM_ABI constexpr byte operator<<(byte __lhs, _Integer __shift) noexcept {
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return static_cast<byte>(static_cast<unsigned char>(static_cast<unsigned int>(__lhs) << __shift));
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}
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template <class _Integer, __enable_if_t<is_integral<_Integer>::value, int> = 0>
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_LIBCPP_HIDE_FROM_ABI constexpr byte& operator>>=(byte& __lhs, _Integer __shift) noexcept {
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return __lhs = __lhs >> __shift;
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}
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template <class _Integer, __enable_if_t<is_integral<_Integer>::value, int> = 0>
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_LIBCPP_HIDE_FROM_ABI constexpr byte operator>>(byte __lhs, _Integer __shift) noexcept {
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return static_cast<byte>(static_cast<unsigned char>(static_cast<unsigned int>(__lhs) >> __shift));
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}
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template <class _Integer, __enable_if_t<is_integral<_Integer>::value, int> = 0>
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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr _Integer to_integer(byte __b) noexcept {
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return static_cast<_Integer>(__b);
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}
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_LIBCPP_END_UNVERSIONED_NAMESPACE_STD
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#endif // _LIBCPP_STD_VER >= 17
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#endif // _LIBCPP___CSTDDEF_BYTE_H
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