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/integral_constant.h>
14 #include <__type_traits/predicate_traits.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 _Lhs, class _Rhs>
30 struct __is_trivial_equality_predicate<__equal_to, _Lhs, _Rhs> : true_type {};
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 _LIBCPP_END_NAMESPACE_STD
46 
47 #endif // _LIBCPP___ALGORITHM_COMP_H
48