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
21struct __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
28template <class _Tp, class _Up>
29inline 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.
33template <class _T1 = void, class _T2 = _T1>
34struct __less {};
35
36template <>
37struct __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
44template <class _Tp>
45inline 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