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150
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1 // -*- C++ -*-
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2 //===--------------------------- __nullptr --------------------------------===//
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3 //
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4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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5 // See https://llvm.org/LICENSE.txt for license information.
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6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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7 //
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8 //===----------------------------------------------------------------------===//
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9
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10 #ifndef _LIBCPP_NULLPTR
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11 #define _LIBCPP_NULLPTR
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12
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13 #include <__config>
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14
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15 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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16 #pragma GCC system_header
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17 #endif
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18
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19 #ifdef _LIBCPP_HAS_NO_NULLPTR
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20
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21 _LIBCPP_BEGIN_NAMESPACE_STD
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22
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23 struct _LIBCPP_TEMPLATE_VIS nullptr_t
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24 {
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25 void* __lx;
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26
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27 struct __nat {int __for_bool_;};
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28
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29 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR nullptr_t() : __lx(0) {}
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30 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR nullptr_t(int __nat::*) : __lx(0) {}
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31
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32 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR operator int __nat::*() const {return 0;}
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33
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34 template <class _Tp>
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35 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
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36 operator _Tp* () const {return 0;}
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37
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38 template <class _Tp, class _Up>
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39 _LIBCPP_INLINE_VISIBILITY
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40 operator _Tp _Up::* () const {return 0;}
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41
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42 friend _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR bool operator==(nullptr_t, nullptr_t) {return true;}
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43 friend _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR bool operator!=(nullptr_t, nullptr_t) {return false;}
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44 };
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45
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46 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR nullptr_t __get_nullptr_t() {return nullptr_t(0);}
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47
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48 #define nullptr _VSTD::__get_nullptr_t()
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49
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50 _LIBCPP_END_NAMESPACE_STD
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51
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52 #else // _LIBCPP_HAS_NO_NULLPTR
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53
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54 namespace std
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55 {
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56 typedef decltype(nullptr) nullptr_t;
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57 }
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58
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59 #endif // _LIBCPP_HAS_NO_NULLPTR
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60
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61 #endif // _LIBCPP_NULLPTR
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