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
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>
30inline 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.
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
45template <class _Tp>
46inline const bool __desugars_to_v<__less_tag, __less<>, _Tp, _Tp> = true;
47
48template <class _Tp>
49inline 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