63 lines
1.7 KiB
C++
63 lines
1.7 KiB
C++
// -*- C++ -*-
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//===--------------------------- __nullptr --------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP_NULLPTR
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#define _LIBCPP_NULLPTR
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#include <__config>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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#pragma GCC system_header
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#endif
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#ifdef _LIBCPP_HAS_NO_NULLPTR
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_LIBCPP_BEGIN_NAMESPACE_STD
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struct _LIBCPP_TEMPLATE_VIS nullptr_t
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{
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void* __lx;
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struct __nat {int __for_bool_;};
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR nullptr_t() : __lx(0) {}
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR nullptr_t(int __nat::*) : __lx(0) {}
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR operator int __nat::*() const {return 0;}
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template <class _Tp>
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
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operator _Tp* () const {return 0;}
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template <class _Tp, class _Up>
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_LIBCPP_INLINE_VISIBILITY
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operator _Tp _Up::* () const {return 0;}
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friend _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR bool operator==(nullptr_t, nullptr_t) {return true;}
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friend _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR bool operator!=(nullptr_t, nullptr_t) {return false;}
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};
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inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR nullptr_t __get_nullptr_t() {return nullptr_t(0);}
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#define nullptr _VSTD::__get_nullptr_t()
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_LIBCPP_END_NAMESPACE_STD
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#else // _LIBCPP_HAS_NO_NULLPTR
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namespace std
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{
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typedef decltype(nullptr) nullptr_t;
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}
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#endif // _LIBCPP_HAS_NO_NULLPTR
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#endif // _LIBCPP_NULLPTR
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