1//===----------------------------------------------------------------------===// 2// 3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4// See https://llvm.org/LICENSE.txt for license information. 5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6// 7//===----------------------------------------------------------------------===// 8 9#ifndef _LIBCPP___TYPE_TRAITS_IS_SIGNED_H 10#define _LIBCPP___TYPE_TRAITS_IS_SIGNED_H 11 12#include <__config> 13#include <__type_traits/integral_constant.h> 14#include <__type_traits/is_arithmetic.h> 15#include <__type_traits/is_integral.h> 16 17#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 18# pragma GCC system_header 19#endif 20 21_LIBCPP_BEGIN_NAMESPACE_STD 22 23#if __has_builtin(__is_signed) 24 25template<class _Tp> 26struct _LIBCPP_TEMPLATE_VIS is_signed : _BoolConstant<__is_signed(_Tp)> { }; 27 28#if _LIBCPP_STD_VER > 14 29template <class _Tp> 30inline constexpr bool is_signed_v = __is_signed(_Tp); 31#endif 32 33#else // __has_builtin(__is_signed) 34 35template <class _Tp, bool = is_integral<_Tp>::value> 36struct __libcpp_is_signed_impl : public _BoolConstant<(_Tp(-1) < _Tp(0))> {}; 37 38template <class _Tp> 39struct __libcpp_is_signed_impl<_Tp, false> : public true_type {}; // floating point 40 41template <class _Tp, bool = is_arithmetic<_Tp>::value> 42struct __libcpp_is_signed : public __libcpp_is_signed_impl<_Tp> {}; 43 44template <class _Tp> struct __libcpp_is_signed<_Tp, false> : public false_type {}; 45 46template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_signed : public __libcpp_is_signed<_Tp> {}; 47 48#if _LIBCPP_STD_VER > 14 49template <class _Tp> 50inline constexpr bool is_signed_v = is_signed<_Tp>::value; 51#endif 52 53#endif // __has_builtin(__is_signed) 54 55_LIBCPP_END_NAMESPACE_STD 56 57#endif // _LIBCPP___TYPE_TRAITS_IS_SIGNED_H 58