| // -*- C++ -*- |
| //===----------------- __utility/to_underlying.h --------------------------===// |
| // |
| // 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___UTILITY_TO_UNDERLYING_H |
| #define _LIBCPP___UTILITY_TO_UNDERLYING_H |
| |
| #include <__config> |
| #include <type_traits> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| #pragma GCC system_header |
| #endif |
| |
| _LIBCPP_PUSH_MACROS |
| #include <__undef_macros> |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| #ifndef _LIBCPP_CXX03_LANG |
| template <class _Tp> |
| _LIBCPP_INLINE_VISIBILITY constexpr typename underlying_type<_Tp>::type |
| __to_underlying(_Tp __val) noexcept { |
| return static_cast<typename underlying_type<_Tp>::type>(__val); |
| } |
| #endif // !_LIBCPP_CXX03_LANG |
| |
| #if _LIBCPP_STD_VER > 20 |
| template <class _Tp> |
| _LIBCPP_NODISCARD_EXT _LIBCPP_INLINE_VISIBILITY constexpr underlying_type_t<_Tp> |
| to_underlying(_Tp __val) noexcept { |
| return _VSTD::__to_underlying(__val); |
| } |
| #endif |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| _LIBCPP_POP_MACROS |
| |
| #endif // _LIBCPP___UTILITY_TO_UNDERLYING_H |
