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