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___ALGORITHM_COMP_H 10 #define _LIBCPP___ALGORITHM_COMP_H 11 12 #include <__config> 13 #include <__type_traits/desugars_to.h> 14 #include <__type_traits/is_integral.h> 15 16 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 17 # pragma GCC system_header 18 #endif 19 20 _LIBCPP_BEGIN_NAMESPACE_STD 21 22 struct __equal_to { 23 template <class _T1, class _T2> 24 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool operator()(const _T1& __x, const _T2& __y) const { 25 return __x == __y; 26 } 27 }; 28 29 template <class _Tp, class _Up> 30 inline const bool __desugars_to_v<__equal_tag, __equal_to, _Tp, _Up> = true; 31 32 // The definition is required because __less is part of the ABI, but it's empty 33 // because all comparisons should be transparent. 34 template <class _T1 = void, class _T2 = _T1> 35 struct __less {}; 36 37 template <> 38 struct __less<void, void> { 39 template <class _Tp, class _Up> 40 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool operator()(const _Tp& __lhs, const _Up& __rhs) const { 41 return __lhs < __rhs; 42 } 43 }; 44 45 template <class _Tp> 46 inline const bool __desugars_to_v<__less_tag, __less<>, _Tp, _Tp> = true; 47 48 template <class _Tp> 49 inline const bool __desugars_to_v<__totally_ordered_less_tag, __less<>, _Tp, _Tp> = is_integral<_Tp>::value; 50 51 _LIBCPP_END_NAMESPACE_STD 52 53 #endif // _LIBCPP___ALGORITHM_COMP_H 54