libcxx initial import
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@103490 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/cstddef b/include/cstddef
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+// -*- C++ -*-
+//===--------------------------- cstddef ----------------------------------===//
+//
+// ÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊThe LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP_CSTDDEF
+#define _LIBCPP_CSTDDEF
+
+/*
+ cstddef synopsis
+
+Macros:
+
+ offsetof(type,member-designator)
+ NULL
+
+namespace std
+{
+
+Types:
+
+ ptrdiff_t
+ size_t
+ max_align_t
+ nullptr_t
+
+} // std
+
+*/
+
+#include <__config>
+#include <stddef.h>
+
+#pragma GCC system_header
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+using ::ptrdiff_t;
+using ::size_t;
+
+typedef long double max_align_t;
+
+#ifdef _LIBCPP_HAS_NO_NULLPTR
+
+struct nullptr_t
+{
+ void* _;
+
+ struct __nat {int __for_bool_;};
+
+ _LIBCPP_ALWAYS_INLINE nullptr_t(int __nat::*) {}
+
+ _LIBCPP_ALWAYS_INLINE operator int __nat::*() const {return 0;}
+
+ template <class T>
+ _LIBCPP_ALWAYS_INLINE
+ operator T* () const {return 0;}
+
+ template <class T, class U>
+ _LIBCPP_ALWAYS_INLINE
+ operator T U::* () const {return 0;}
+
+ friend _LIBCPP_ALWAYS_INLINE bool operator==(nullptr_t, nullptr_t) {return true;}
+ friend _LIBCPP_ALWAYS_INLINE bool operator!=(nullptr_t, nullptr_t) {return false;}
+ friend _LIBCPP_ALWAYS_INLINE bool operator<(nullptr_t, nullptr_t) {return false;}
+ friend _LIBCPP_ALWAYS_INLINE bool operator<=(nullptr_t, nullptr_t) {return true;}
+ friend _LIBCPP_ALWAYS_INLINE bool operator>(nullptr_t, nullptr_t) {return false;}
+ friend _LIBCPP_ALWAYS_INLINE bool operator>=(nullptr_t, nullptr_t) {return true;}
+};
+
+inline _LIBCPP_ALWAYS_INLINE nullptr_t __get_nullptr_t() {return nullptr_t(0);}
+
+#define nullptr _STD::__get_nullptr_t()
+
+#else
+
+typedef decltype(nullptr) nullptr_t;
+
+#endif
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP_CSTDDEF