headers/libs/libc++/stddef.h

   1 // -*- C++ -*-
   2 //===--------------------------- stddef.h ---------------------------------===//
   3 //
   4 //                     The LLVM Compiler Infrastructure
   5 //
   6 // This file is dual licensed under the MIT and the University of Illinois Open
   7 // Source Licenses. See LICENSE.TXT for details.
   8 //
   9 //===----------------------------------------------------------------------===//
  10
  11 #if defined(__need_ptrdiff_t) || defined(__need_size_t) || \
  12     defined(__need_wchar_t) || defined(__need_NULL) || defined(__need_wint_t)
  13
  14 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  15 #pragma GCC system_header
  16 #endif
  17
  18 #include_next <stddef.h>
  19
  20 #elif !defined(_LIBCPP_STDDEF_H)
  21 #define _LIBCPP_STDDEF_H
  22
  23 /*
  24     stddef.h synopsis
  25
  26 Macros:
  27
  28     offsetof(type,member-designator)
  29     NULL
  30
  31 Types:
  32
  33     ptrdiff_t
  34     size_t
  35     max_align_t
  36     nullptr_t
  37
  38 */
  39
  40 #include <__config>
  41
  42 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  43 #pragma GCC system_header
  44 #endif
  45
  46 #include_next <stddef.h>
  47
  48 #ifdef __cplusplus
  49
  50 extern "C++" {
  51 #include <__nullptr>
  52 using std::nullptr_t;
  53 }
  54
  55 // Re-use the compiler's <stddef.h> max_align_t where possible.
  56 #if !defined(__CLANG_MAX_ALIGN_T_DEFINED) && !defined(_GCC_MAX_ALIGN_T)
  57 typedef long double max_align_t;
  58 #endif
  59
  60 #endif
  61
  62 #endif  // _LIBCPP_STDDEF_H