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_UNSIGNED_H
10 #define _LIBCPP___TYPE_TRAITS_IS_UNSIGNED_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_unsigned)
24 
25 template<class _Tp>
26 struct _LIBCPP_TEMPLATE_VIS is_unsigned : _BoolConstant<__is_unsigned(_Tp)> { };
27 
28 #if _LIBCPP_STD_VER > 14
29 template <class _Tp>
30 inline constexpr bool is_unsigned_v = __is_unsigned(_Tp);
31 #endif
32 
33 #else // __has_builtin(__is_unsigned)
34 
35 template <class _Tp, bool = is_integral<_Tp>::value>
36 struct __libcpp_is_unsigned_impl : public _BoolConstant<(_Tp(0) < _Tp(-1))> {};
37 
38 template <class _Tp>
39 struct __libcpp_is_unsigned_impl<_Tp, false> : public false_type {};  // floating point
40 
41 template <class _Tp, bool = is_arithmetic<_Tp>::value>
42 struct __libcpp_is_unsigned : public __libcpp_is_unsigned_impl<_Tp> {};
43 
44 template <class _Tp> struct __libcpp_is_unsigned<_Tp, false> : public false_type {};
45 
46 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_unsigned : public __libcpp_is_unsigned<_Tp> {};
47 
48 #if _LIBCPP_STD_VER > 14
49 template <class _Tp>
50 inline constexpr bool is_unsigned_v = is_unsigned<_Tp>::value;
51 #endif
52 
53 #endif // __has_builtin(__is_unsigned)
54 
55 _LIBCPP_END_NAMESPACE_STD
56 
57 #endif // _LIBCPP___TYPE_TRAITS_IS_UNSIGNED_H
58