derek.holloway
7502bf64a4
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61 lines
2.2 KiB
C++
61 lines
2.2 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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// SPDX-FileCopyrightText: Copyright (c) 2023 NVIDIA CORPORATION & AFFILIATES.
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCUDACXX___CONCEPTS_ASSIGNABLE_H
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#define _LIBCUDACXX___CONCEPTS_ASSIGNABLE_H
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#include <cuda/std/detail/__config>
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#if defined(_CCCL_IMPLICIT_SYSTEM_HEADER_GCC)
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# pragma GCC system_header
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#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_CLANG)
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# pragma clang system_header
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#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC)
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# pragma system_header
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#endif // no system header
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#include <cuda/std/__concepts/common_reference_with.h>
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#include <cuda/std/__concepts/concept_macros.h>
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#include <cuda/std/__concepts/same_as.h>
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#include <cuda/std/__type_traits/is_reference.h>
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#include <cuda/std/__type_traits/make_const_lvalue_ref.h>
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#include <cuda/std/__utility/forward.h>
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_LIBCUDACXX_BEGIN_NAMESPACE_STD
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#if !defined(_CCCL_NO_CONCEPTS)
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// [concept.assignable]
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template <class _Lhs, class _Rhs>
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concept assignable_from =
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is_lvalue_reference_v<_Lhs> && common_reference_with<__make_const_lvalue_ref<_Lhs>, __make_const_lvalue_ref<_Rhs>>
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&& requires(_Lhs __lhs, _Rhs&& __rhs) {
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{ __lhs = _CUDA_VSTD::forward<_Rhs>(__rhs) } -> same_as<_Lhs>;
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};
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#elif !defined(_CCCL_NO_VARIABLE_TEMPLATES) // ^^^ !_CCCL_NO_CONCEPTS ^^^
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template <class _Lhs, class _Rhs>
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_CCCL_CONCEPT_FRAGMENT(
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__assignable_from_,
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requires(_Lhs __lhs,
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_Rhs&& __rhs)(requires(_CCCL_TRAIT(is_lvalue_reference, _Lhs)),
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requires(common_reference_with<__make_const_lvalue_ref<_Lhs>, __make_const_lvalue_ref<_Rhs>>),
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requires(same_as<_Lhs, decltype(__lhs = _CUDA_VSTD::forward<_Rhs>(__rhs))>)));
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template <class _Lhs, class _Rhs>
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_CCCL_CONCEPT assignable_from = _CCCL_FRAGMENT(__assignable_from_, _Lhs, _Rhs);
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#endif // ^^^ !_CCCL_NO_VARIABLE_TEMPLATES
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_LIBCUDACXX_END_NAMESPACE_STD
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#endif // _LIBCUDACXX___CONCEPTS_ASSIGNABLE_H
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