Factor definition of std::nullptr_t out of <cstddef> into a header that can also be used by <stddef.h>.
llvm-svn: 249737
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: c467d9b4923ed6b19142ecd74d3c5c1b0781eab9
diff --git a/include/__nullptr b/include/__nullptr
new file mode 100644
index 0000000..95415a6
--- /dev/null
+++ b/include/__nullptr
@@ -0,0 +1,66 @@
+// -*- C++ -*-
+//===--------------------------- __nullptr --------------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP_NULLPTR
+#define _LIBCPP_NULLPTR
+
+#include <__config>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#pragma GCC system_header
+#endif
+
+#ifdef _LIBCPP_HAS_NO_NULLPTR
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+struct _LIBCPP_TYPE_VIS_ONLY nullptr_t
+{
+ void* __lx;
+
+ struct __nat {int __for_bool_;};
+
+ _LIBCPP_ALWAYS_INLINE _LIBCPP_CONSTEXPR nullptr_t() : __lx(0) {}
+ _LIBCPP_ALWAYS_INLINE _LIBCPP_CONSTEXPR nullptr_t(int __nat::*) : __lx(0) {}
+
+ _LIBCPP_ALWAYS_INLINE _LIBCPP_CONSTEXPR operator int __nat::*() const {return 0;}
+
+ template <class _Tp>
+ _LIBCPP_ALWAYS_INLINE _LIBCPP_CONSTEXPR
+ operator _Tp* () const {return 0;}
+
+ template <class _Tp, class _Up>
+ _LIBCPP_ALWAYS_INLINE
+ operator _Tp _Up::* () const {return 0;}
+
+ friend _LIBCPP_ALWAYS_INLINE _LIBCPP_CONSTEXPR bool operator==(nullptr_t, nullptr_t) {return true;}
+ friend _LIBCPP_ALWAYS_INLINE _LIBCPP_CONSTEXPR bool operator!=(nullptr_t, nullptr_t) {return false;}
+ friend _LIBCPP_ALWAYS_INLINE _LIBCPP_CONSTEXPR bool operator<(nullptr_t, nullptr_t) {return false;}
+ friend _LIBCPP_ALWAYS_INLINE _LIBCPP_CONSTEXPR bool operator<=(nullptr_t, nullptr_t) {return true;}
+ friend _LIBCPP_ALWAYS_INLINE _LIBCPP_CONSTEXPR bool operator>(nullptr_t, nullptr_t) {return false;}
+ friend _LIBCPP_ALWAYS_INLINE _LIBCPP_CONSTEXPR bool operator>=(nullptr_t, nullptr_t) {return true;}
+};
+
+inline _LIBCPP_ALWAYS_INLINE _LIBCPP_CONSTEXPR nullptr_t __get_nullptr_t() {return nullptr_t(0);}
+
+#define nullptr _VSTD::__get_nullptr_t()
+
+_LIBCPP_END_NAMESPACE_STD
+
+#else // _LIBCPP_HAS_NO_NULLPTR
+
+namespace std
+{
+ typedef decltype(nullptr) nullptr_t;
+}
+
+#endif // _LIBCPP_HAS_NO_NULLPTR
+
+#endif // _LIBCPP_NULLPTR