xref: /freebsd/contrib/llvm-project/libcxx/include/cstddef (revision 0fca6ea1d4eea4c934cfff25ac9ee8ad6fe95583)

// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP_CSTDDEF
#define _LIBCPP_CSTDDEF

/*
    cstddef synopsis

Macros:

    offsetof(type,member-designator)
    NULL

namespace std
{

Types:

    ptrdiff_t
    size_t
    max_align_t // C++11
    nullptr_t
    byte // C++17

}  // std

*/

#include <__config>
#include <__type_traits/enable_if.h>
#include <__type_traits/integral_constant.h>
#include <__type_traits/is_integral.h>
#include <version>

#include <stddef.h>

#ifndef _LIBCPP_STDDEF_H
#   error <cstddef> tried including <stddef.h> but didn't find libc++'s <stddef.h> header. \
          This usually means that your header search paths are not configured properly. \
          The header search paths should contain the C++ Standard Library headers before \
          any C Standard Library, and you are probably using compiler flags that make that \
          not be the case.
#endif

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#  pragma GCC system_header
#endif

_LIBCPP_BEGIN_NAMESPACE_STD

using ::nullptr_t;
using ::ptrdiff_t _LIBCPP_USING_IF_EXISTS;
using ::size_t _LIBCPP_USING_IF_EXISTS;

#if !defined(_LIBCPP_CXX03_LANG)
using ::max_align_t _LIBCPP_USING_IF_EXISTS;
#endif

_LIBCPP_END_NAMESPACE_STD

#if _LIBCPP_STD_VER >= 17
namespace std // purposefully not versioned
{
enum class byte : unsigned char {};

_LIBCPP_HIDE_FROM_ABI inline constexpr byte operator|(byte __lhs, byte __rhs) noexcept {
  return static_cast<byte>(
      static_cast<unsigned char>(static_cast<unsigned int>(__lhs) | static_cast<unsigned int>(__rhs)));
}

_LIBCPP_HIDE_FROM_ABI inline constexpr byte& operator|=(byte& __lhs, byte __rhs) noexcept {
  return __lhs = __lhs | __rhs;
}

_LIBCPP_HIDE_FROM_ABI inline constexpr byte operator&(byte __lhs, byte __rhs) noexcept {
  return static_cast<byte>(
      static_cast<unsigned char>(static_cast<unsigned int>(__lhs) & static_cast<unsigned int>(__rhs)));
}

_LIBCPP_HIDE_FROM_ABI inline constexpr byte& operator&=(byte& __lhs, byte __rhs) noexcept {
  return __lhs = __lhs & __rhs;
}

_LIBCPP_HIDE_FROM_ABI inline constexpr byte operator^(byte __lhs, byte __rhs) noexcept {
  return static_cast<byte>(
      static_cast<unsigned char>(static_cast<unsigned int>(__lhs) ^ static_cast<unsigned int>(__rhs)));
}

_LIBCPP_HIDE_FROM_ABI inline constexpr byte& operator^=(byte& __lhs, byte __rhs) noexcept {
  return __lhs = __lhs ^ __rhs;
}

_LIBCPP_HIDE_FROM_ABI inline constexpr byte operator~(byte __b) noexcept {
  return static_cast<byte>(static_cast<unsigned char>(~static_cast<unsigned int>(__b)));
}

template <class _Integer, __enable_if_t<is_integral<_Integer>::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI constexpr byte& operator<<=(byte& __lhs, _Integer __shift) noexcept {
  return __lhs = __lhs << __shift;
}

template <class _Integer, __enable_if_t<is_integral<_Integer>::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI constexpr byte operator<<(byte __lhs, _Integer __shift) noexcept {
  return static_cast<byte>(static_cast<unsigned char>(static_cast<unsigned int>(__lhs) << __shift));
}

template <class _Integer, __enable_if_t<is_integral<_Integer>::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI constexpr byte& operator>>=(byte& __lhs, _Integer __shift) noexcept {
  return __lhs = __lhs >> __shift;
}

template <class _Integer, __enable_if_t<is_integral<_Integer>::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI constexpr byte operator>>(byte __lhs, _Integer __shift) noexcept {
  return static_cast<byte>(static_cast<unsigned char>(static_cast<unsigned int>(__lhs) >> __shift));
}

template <class _Integer, __enable_if_t<is_integral<_Integer>::value, int> = 0>
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr _Integer to_integer(byte __b) noexcept {
  return static_cast<_Integer>(__b);
}

} // namespace std

#endif

#endif // _LIBCPP_CSTDDEF