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/operation_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
22struct __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
29template <class _Tp, class _Up>
30struct __desugars_to<__equal_tag, __equal_to, _Tp, _Up> : 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.
34template <class _T1 = void, class _T2 = _T1>
35struct __less {};
36
37template <>
38struct __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