Home | History | Annotate | Download | only in include 
      1 // -*- C++ -*-
      2 //===--------------------------- cstddef ----------------------------------===//
      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 #ifndef _LIBCPP_CSTDDEF
     12 #define _LIBCPP_CSTDDEF
     13 
     14 /*
     15     cstddef synopsis
     16 
     17 Macros:
     18 
     19     offsetof(type,member-designator)
     20     NULL
     21 
     22 namespace std
     23 {
     24 
     25 Types:
     26 
     27     ptrdiff_t
     28     size_t
     29     max_align_t
     30     nullptr_t
     31 
     32 }  // std
     33 
     34 */
     35 
     36 #include <__config>
     37 
     38 #ifdef __GLIBC__
     39 #define __need_NULL
     40 #define __need_ptrdiff_t
     41 #define __need_size_t
     42 #endif  // __GLIBC__
     43 
     44 #include <stddef.h>
     45 
     46 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
     47 #pragma GCC system_header
     48 #endif
     49 
     50 _LIBCPP_BEGIN_NAMESPACE_STD
     51 
     52 using ::ptrdiff_t;
     53 using ::size_t;
     54 
     55 typedef long double max_align_t;
     56 
     57 #ifdef _LIBCPP_HAS_NO_NULLPTR
     58 
     59 struct _LIBCPP_TYPE_VIS nullptr_t
     60 {
     61     void* __lx;
     62 
     63     struct __nat {int __for_bool_;};
     64 
     65     _LIBCPP_ALWAYS_INLINE _LIBCPP_CONSTEXPR nullptr_t() : __lx(0) {}
     66     _LIBCPP_ALWAYS_INLINE _LIBCPP_CONSTEXPR nullptr_t(int __nat::*) : __lx(0) {}
     67 
     68     _LIBCPP_ALWAYS_INLINE _LIBCPP_CONSTEXPR operator int __nat::*() const {return 0;}
     69 
     70     template <class _Tp>
     71         _LIBCPP_ALWAYS_INLINE _LIBCPP_CONSTEXPR
     72         operator _Tp* () const {return 0;}
     73 
     74     template <class _Tp, class _Up>
     75         _LIBCPP_ALWAYS_INLINE
     76         operator _Tp _Up::* () const {return 0;}
     77 
     78     friend _LIBCPP_ALWAYS_INLINE _LIBCPP_CONSTEXPR bool operator==(nullptr_t, nullptr_t) {return true;}
     79     friend _LIBCPP_ALWAYS_INLINE _LIBCPP_CONSTEXPR bool operator!=(nullptr_t, nullptr_t) {return false;}
     80     friend _LIBCPP_ALWAYS_INLINE _LIBCPP_CONSTEXPR bool operator<(nullptr_t, nullptr_t) {return false;}
     81     friend _LIBCPP_ALWAYS_INLINE _LIBCPP_CONSTEXPR bool operator<=(nullptr_t, nullptr_t) {return true;}
     82     friend _LIBCPP_ALWAYS_INLINE _LIBCPP_CONSTEXPR bool operator>(nullptr_t, nullptr_t) {return false;}
     83     friend _LIBCPP_ALWAYS_INLINE _LIBCPP_CONSTEXPR bool operator>=(nullptr_t, nullptr_t) {return true;}
     84 };
     85 
     86 inline _LIBCPP_ALWAYS_INLINE _LIBCPP_CONSTEXPR nullptr_t __get_nullptr_t() {return nullptr_t(0);}
     87 
     88 #define nullptr _VSTD::__get_nullptr_t()
     89 
     90 #endif  // _LIBCPP_HAS_NO_NULLPTR
     91 
     92 _LIBCPP_END_NAMESPACE_STD
     93 
     94 #ifndef _LIBCPP_HAS_NO_NULLPTR
     95 
     96 namespace std
     97 {
     98     typedef decltype(nullptr) nullptr_t;
     99 }
    100 
    101 #endif  // _LIBCPP_HAS_NO_NULLPTR
    102 
    103 #endif  // _LIBCPP_CSTDDEF
    104