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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_ASSIGNABLE_H
#define _LIBCUDACXX___CONCEPTS_ASSIGNABLE_H
#ifndef __cuda_std__
#include <__config>
#endif //__cuda_std__
#include "../__concepts/__concept_macros.h"
#include "../__concepts/common_reference_with.h"
#include "../__concepts/same_as.h"
#include "../__type_traits/is_reference.h"
#include "../__type_traits/make_const_lvalue_ref.h"
#include "../__utility/forward.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.assignable]
template<class _Lhs, class _Rhs>
concept assignable_from =
is_lvalue_reference_v<_Lhs> &&
common_reference_with<__make_const_lvalue_ref<_Lhs>, __make_const_lvalue_ref<_Rhs>> &&
requires (_Lhs __lhs, _Rhs&& __rhs) {
{ __lhs = _CUDA_VSTD::forward<_Rhs>(__rhs) } -> same_as<_Lhs>;
};
#elif _LIBCUDACXX_STD_VER > 11
template<class _Lhs, class _Rhs>
_LIBCUDACXX_CONCEPT_FRAGMENT(
__assignable_from_,
requires(_Lhs __lhs, _Rhs&& __rhs)(
requires(_LIBCUDACXX_TRAIT(is_lvalue_reference, _Lhs)),
requires(common_reference_with<__make_const_lvalue_ref<_Lhs>, __make_const_lvalue_ref<_Rhs>>),
requires(same_as<_Lhs, decltype(__lhs = _CUDA_VSTD::forward<_Rhs>(__rhs))>)
));
template<class _Lhs, class _Rhs>
_LIBCUDACXX_CONCEPT assignable_from = _LIBCUDACXX_FRAGMENT(__assignable_from_, _Lhs, _Rhs);
#endif // _LIBCUDACXX_STD_VER > 11
_LIBCUDACXX_END_NAMESPACE_STD
#endif // _LIBCUDACXX___CONCEPTS_ASSIGNABLE_H
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