libcxx/include/stddef.h

// -*- 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
//
//===----------------------------------------------------------------------===//

/*
    stddef.h synopsis

Macros:

    offsetof(type,member-designator)
    NULL

Types:

    ptrdiff_t
    size_t
    max_align_t // C++11
    nullptr_t

*/

#if defined(__cplusplus) && __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
#  include <__cxx03/stddef.h>
#else
#  include <__config>

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

// Note: This include is outside of header guards because we sometimes get included multiple times
//       with different defines and the underlying <stddef.h> will know how to deal with that.
#  include_next <stddef.h>

#  ifndef _LIBCPP_STDDEF_H
#    define _LIBCPP_STDDEF_H

#    ifdef __cplusplus
typedef decltype(nullptr) nullptr_t;
#    endif
#  endif // defined(__cplusplus) && __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)

#endif // _LIBCPP_STDDEF_H