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_generic_transparent_comparator.h>
15#include <__type_traits/is_integral.h>
16
17#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
18# pragma GCC system_header
19#endif
20
21_LIBCPP_BEGIN_NAMESPACE_STD
22
23struct __equal_to {
24 template <class _T1, class _T2>
25 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool operator()(const _T1& __x, const _T2& __y) const {
26 return __x == __y;
27 }
28};
29
30template <class _Tp, class _Up>
31inline const bool __desugars_to_v<__equal_tag, __equal_to, _Tp, _Up> = true;
32
33// The definition is required because __less is part of the ABI, but it's empty
34// because all comparisons should be transparent.
35template <class _T1 = void, class _T2 = _T1>
36struct __less {};
37
38template <>
39struct __less<void, void> {
40 template <class _Tp, class _Up>
41 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool operator()(const _Tp& __lhs, const _Up& __rhs) const {
42 return __lhs < __rhs;
43 }
44};
45
46template <class _Tp>
47inline const bool __desugars_to_v<__less_tag, __less<>, _Tp, _Tp> = true;
48
49template <class _Tp>
50inline const bool __desugars_to_v<__totally_ordered_less_tag, __less<>, _Tp, _Tp> = is_integral<_Tp>::value;
51
52template <>
53inline const bool __is_generic_transparent_comparator_v<__less<> > = true;
54
55_LIBCPP_END_NAMESPACE_STD
56
57#endif // _LIBCPP___ALGORITHM_COMP_H
58