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