| // -*- C++ -*- |
| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #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_TEMPLATE_VIS nullptr_t |
| { |
| void* __lx; |
| |
| struct __nat {int __for_bool_;}; |
| |
| _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR nullptr_t() : __lx(0) {} |
| _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR nullptr_t(int __nat::*) : __lx(0) {} |
| |
| _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR operator int __nat::*() const {return 0;} |
| |
| template <class _Tp> |
| _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR |
| operator _Tp* () const {return 0;} |
| |
| template <class _Tp, class _Up> |
| _LIBCPP_INLINE_VISIBILITY |
| operator _Tp _Up::* () const {return 0;} |
| |
| friend _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR bool operator==(nullptr_t, nullptr_t) {return true;} |
| friend _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR bool operator!=(nullptr_t, nullptr_t) {return false;} |
| }; |
| |
| inline _LIBCPP_INLINE_VISIBILITY _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 |