1 // -*- C++ -*- 2 //===----------------------------------------------------------------------===// 3 // 4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5 // See https://llvm.org/LICENSE.txt for license information. 6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7 // 8 //===----------------------------------------------------------------------===// 9 10 #ifndef _LIBCPP___FUNCTIONAL_RANGES_OPERATIONS_H 11 #define _LIBCPP___FUNCTIONAL_RANGES_OPERATIONS_H 12 13 #include <__concepts/equality_comparable.h> 14 #include <__concepts/totally_ordered.h> 15 #include <__config> 16 #include <__type_traits/integral_constant.h> 17 #include <__type_traits/operation_traits.h> 18 #include <__utility/forward.h> 19 20 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 21 # pragma GCC system_header 22 #endif 23 24 _LIBCPP_BEGIN_NAMESPACE_STD 25 26 #if _LIBCPP_STD_VER >= 20 27 28 namespace ranges { 29 30 struct equal_to { 31 template <class _Tp, class _Up> 32 requires equality_comparable_with<_Tp, _Up> operatorequal_to33 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool operator()(_Tp&& __t, _Up&& __u) const 34 noexcept(noexcept(bool(std::forward<_Tp>(__t) == std::forward<_Up>(__u)))) { 35 return std::forward<_Tp>(__t) == std::forward<_Up>(__u); 36 } 37 38 using is_transparent = void; 39 }; 40 41 struct not_equal_to { 42 template <class _Tp, class _Up> 43 requires equality_comparable_with<_Tp, _Up> operatornot_equal_to44 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool operator()(_Tp&& __t, _Up&& __u) const 45 noexcept(noexcept(bool(!(std::forward<_Tp>(__t) == std::forward<_Up>(__u))))) { 46 return !(std::forward<_Tp>(__t) == std::forward<_Up>(__u)); 47 } 48 49 using is_transparent = void; 50 }; 51 52 struct less { 53 template <class _Tp, class _Up> 54 requires totally_ordered_with<_Tp, _Up> operatorless55 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool operator()(_Tp&& __t, _Up&& __u) const 56 noexcept(noexcept(bool(std::forward<_Tp>(__t) < std::forward<_Up>(__u)))) { 57 return std::forward<_Tp>(__t) < std::forward<_Up>(__u); 58 } 59 60 using is_transparent = void; 61 }; 62 63 struct less_equal { 64 template <class _Tp, class _Up> 65 requires totally_ordered_with<_Tp, _Up> operatorless_equal66 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool operator()(_Tp&& __t, _Up&& __u) const 67 noexcept(noexcept(bool(!(std::forward<_Up>(__u) < std::forward<_Tp>(__t))))) { 68 return !(std::forward<_Up>(__u) < std::forward<_Tp>(__t)); 69 } 70 71 using is_transparent = void; 72 }; 73 74 struct greater { 75 template <class _Tp, class _Up> 76 requires totally_ordered_with<_Tp, _Up> operatorgreater77 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool operator()(_Tp&& __t, _Up&& __u) const 78 noexcept(noexcept(bool(std::forward<_Up>(__u) < std::forward<_Tp>(__t)))) { 79 return std::forward<_Up>(__u) < std::forward<_Tp>(__t); 80 } 81 82 using is_transparent = void; 83 }; 84 85 struct greater_equal { 86 template <class _Tp, class _Up> 87 requires totally_ordered_with<_Tp, _Up> operatorgreater_equal88 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool operator()(_Tp&& __t, _Up&& __u) const 89 noexcept(noexcept(bool(!(std::forward<_Tp>(__t) < std::forward<_Up>(__u))))) { 90 return !(std::forward<_Tp>(__t) < std::forward<_Up>(__u)); 91 } 92 93 using is_transparent = void; 94 }; 95 96 } // namespace ranges 97 98 // For ranges we do not require that the types on each side of the equality 99 // operator are of the same type 100 template <class _Tp, class _Up> 101 struct __desugars_to<__equal_tag, ranges::equal_to, _Tp, _Up> : true_type {}; 102 103 #endif // _LIBCPP_STD_VER >= 20 104 105 _LIBCPP_END_NAMESPACE_STD 106 107 #endif // _LIBCPP___FUNCTIONAL_RANGES_OPERATIONS_H 108