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//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// SPDX-FileCopyrightText: Copyright (c) 2023 NVIDIA CORPORATION & AFFILIATES.
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCUDACXX___CONCEPTS_EQUALITY_COMPARABLE_H
#define _LIBCUDACXX___CONCEPTS_EQUALITY_COMPARABLE_H
#ifndef __cuda_std__
#include <__config>
#endif //__cuda_std__
#include "../__concepts/__concept_macros.h"
#include "../__concepts/boolean_testable.h"
#include "../__concepts/common_reference_with.h"
#include "../__type_traits/common_reference.h"
#include "../__type_traits/make_const_lvalue_ref.h"
#if defined(_CCCL_IMPLICIT_SYSTEM_HEADER_GCC)
# pragma GCC system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_CLANG)
# pragma clang system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC)
# pragma system_header
#endif // no system header
_LIBCUDACXX_BEGIN_NAMESPACE_STD
#if _LIBCUDACXX_STD_VER > 17
// [concept.equalitycomparable]
template<class _Tp, class _Up>
concept __weakly_equality_comparable_with =
requires(__make_const_lvalue_ref<_Tp> __t, __make_const_lvalue_ref<_Up> __u) {
{ __t == __u } -> __boolean_testable;
{ __t != __u } -> __boolean_testable;
{ __u == __t } -> __boolean_testable;
{ __u != __t } -> __boolean_testable;
};
template<class _Tp>
concept equality_comparable = __weakly_equality_comparable_with<_Tp, _Tp>;
template<class _Tp, class _Up>
concept equality_comparable_with =
equality_comparable<_Tp> && equality_comparable<_Up> &&
common_reference_with<__make_const_lvalue_ref<_Tp>, __make_const_lvalue_ref<_Up>> &&
equality_comparable<
common_reference_t<
__make_const_lvalue_ref<_Tp>,
__make_const_lvalue_ref<_Up>>> &&
__weakly_equality_comparable_with<_Tp, _Up>;
#elif _LIBCUDACXX_STD_VER > 11
template<class _Tp>
_LIBCUDACXX_CONCEPT_FRAGMENT(
__with_lvalue_reference_,
requires()(
typename(__make_const_lvalue_ref<_Tp>)
));
template<class _Tp>
_LIBCUDACXX_CONCEPT _With_lvalue_reference = _LIBCUDACXX_FRAGMENT(__with_lvalue_reference_, _Tp);
template<class _Tp, class _Up>
_LIBCUDACXX_CONCEPT_FRAGMENT(
__weakly_equality_comparable_with_,
requires(__make_const_lvalue_ref<_Tp> __t, __make_const_lvalue_ref<_Up> __u)(
requires(_With_lvalue_reference<_Tp>),
requires(_With_lvalue_reference<_Up>),
requires(__boolean_testable<decltype(__t == __u)>),
requires(__boolean_testable<decltype(__t != __u)>),
requires(__boolean_testable<decltype(__u == __t)>),
requires(__boolean_testable<decltype(__u != __t)>)
));
template<class _Tp, class _Up>
_LIBCUDACXX_CONCEPT __weakly_equality_comparable_with =
_LIBCUDACXX_FRAGMENT(__weakly_equality_comparable_with_, _Tp, _Up);
template<class _Tp>
_LIBCUDACXX_CONCEPT equality_comparable = __weakly_equality_comparable_with<_Tp, _Tp>;
template<class _Tp, class _Up>
_LIBCUDACXX_CONCEPT_FRAGMENT(
__equality_comparable_with_,
requires()(
requires(equality_comparable<_Tp>),
requires(equality_comparable<_Up>),
requires(common_reference_with<__make_const_lvalue_ref<_Tp>, __make_const_lvalue_ref<_Up>>),
requires(equality_comparable<
common_reference_t<
__make_const_lvalue_ref<_Tp>,
__make_const_lvalue_ref<_Up>>>),
requires(__weakly_equality_comparable_with<_Tp, _Up>)));
template<class _Tp, class _Up>
_LIBCUDACXX_CONCEPT equality_comparable_with = _LIBCUDACXX_FRAGMENT(__equality_comparable_with_, _Tp, _Up);
#endif // _LIBCUDACXX_STD_VER > 11
_LIBCUDACXX_END_NAMESPACE_STD
#endif // _LIBCUDACXX___CONCEPTS_EQUALITY_COMPARABLE_H
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