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___UTILITY_CMP_H 10 #define _LIBCPP___UTILITY_CMP_H 11 12 #include <__config> 13 #include <__type_traits/disjunction.h> 14 #include <__type_traits/is_integral.h> 15 #include <__type_traits/is_same.h> 16 #include <__type_traits/is_signed.h> 17 #include <__type_traits/make_unsigned.h> 18 #include <__utility/forward.h> 19 #include <__utility/move.h> 20 #include <limits> 21 22 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 23 # pragma GCC system_header 24 #endif 25 26 _LIBCPP_PUSH_MACROS 27 #include <__undef_macros> 28 29 _LIBCPP_BEGIN_NAMESPACE_STD 30 31 #if _LIBCPP_STD_VER > 17 32 template<class _Tp, class... _Up> 33 struct _IsSameAsAny : _Or<_IsSame<_Tp, _Up>...> {}; 34 35 template<class _Tp> 36 concept __is_safe_integral_cmp = is_integral_v<_Tp> && 37 !_IsSameAsAny<_Tp, bool, char, char16_t, char32_t 38 #ifndef _LIBCPP_HAS_NO_CHAR8_T 39 , char8_t 40 #endif 41 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS 42 , wchar_t 43 #endif 44 >::value; 45 46 template<__is_safe_integral_cmp _Tp, __is_safe_integral_cmp _Up> 47 _LIBCPP_INLINE_VISIBILITY constexpr 48 bool cmp_equal(_Tp __t, _Up __u) noexcept 49 { 50 if constexpr (is_signed_v<_Tp> == is_signed_v<_Up>) 51 return __t == __u; 52 else if constexpr (is_signed_v<_Tp>) 53 return __t < 0 ? false : make_unsigned_t<_Tp>(__t) == __u; 54 else 55 return __u < 0 ? false : __t == make_unsigned_t<_Up>(__u); 56 } 57 58 template<__is_safe_integral_cmp _Tp, __is_safe_integral_cmp _Up> 59 _LIBCPP_INLINE_VISIBILITY constexpr 60 bool cmp_not_equal(_Tp __t, _Up __u) noexcept 61 { 62 return !_VSTD::cmp_equal(__t, __u); 63 } 64 65 template<__is_safe_integral_cmp _Tp, __is_safe_integral_cmp _Up> 66 _LIBCPP_INLINE_VISIBILITY constexpr 67 bool cmp_less(_Tp __t, _Up __u) noexcept 68 { 69 if constexpr (is_signed_v<_Tp> == is_signed_v<_Up>) 70 return __t < __u; 71 else if constexpr (is_signed_v<_Tp>) 72 return __t < 0 ? true : make_unsigned_t<_Tp>(__t) < __u; 73 else 74 return __u < 0 ? false : __t < make_unsigned_t<_Up>(__u); 75 } 76 77 template<__is_safe_integral_cmp _Tp, __is_safe_integral_cmp _Up> 78 _LIBCPP_INLINE_VISIBILITY constexpr 79 bool cmp_greater(_Tp __t, _Up __u) noexcept 80 { 81 return _VSTD::cmp_less(__u, __t); 82 } 83 84 template<__is_safe_integral_cmp _Tp, __is_safe_integral_cmp _Up> 85 _LIBCPP_INLINE_VISIBILITY constexpr 86 bool cmp_less_equal(_Tp __t, _Up __u) noexcept 87 { 88 return !_VSTD::cmp_greater(__t, __u); 89 } 90 91 template<__is_safe_integral_cmp _Tp, __is_safe_integral_cmp _Up> 92 _LIBCPP_INLINE_VISIBILITY constexpr 93 bool cmp_greater_equal(_Tp __t, _Up __u) noexcept 94 { 95 return !_VSTD::cmp_less(__t, __u); 96 } 97 98 template<__is_safe_integral_cmp _Tp, __is_safe_integral_cmp _Up> 99 _LIBCPP_INLINE_VISIBILITY constexpr 100 bool in_range(_Up __u) noexcept 101 { 102 return _VSTD::cmp_less_equal(__u, numeric_limits<_Tp>::max()) && 103 _VSTD::cmp_greater_equal(__u, numeric_limits<_Tp>::min()); 104 } 105 #endif // _LIBCPP_STD_VER > 17 106 107 _LIBCPP_END_NAMESPACE_STD 108 109 _LIBCPP_POP_MACROS 110 111 #endif // _LIBCPP___UTILITY_CMP_H 112