derek.holloway
7502bf64a4
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54 lines
1.8 KiB
C++
54 lines
1.8 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_DERIVED_FROM_H
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#define _LIBCUDACXX___CONCEPTS_DERIVED_FROM_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/concept_macros.h>
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#include <cuda/std/__type_traits/add_pointer.h>
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#include <cuda/std/__type_traits/is_base_of.h>
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#include <cuda/std/__type_traits/is_convertible.h>
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_LIBCUDACXX_BEGIN_NAMESPACE_STD
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#if !defined(_CCCL_NO_CONCEPTS)
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// [concept.derived]
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template <class _Dp, class _Bp>
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concept derived_from = is_base_of_v<_Bp, _Dp> && is_convertible_v<const volatile _Dp*, const volatile _Bp*>;
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#elif !defined(_CCCL_NO_VARIABLE_TEMPLATES) // ^^^ !_CCCL_NO_CONCEPTS ^^^
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template <class _Dp, class _Bp>
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_CCCL_CONCEPT_FRAGMENT(
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__derived_from_,
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requires()(
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requires(_CCCL_TRAIT(is_base_of, _Bp, _Dp)),
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requires(_CCCL_TRAIT(is_convertible, add_pointer_t<const volatile _Dp>, add_pointer_t<const volatile _Bp>))));
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template <class _Dp, class _Bp>
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_CCCL_CONCEPT derived_from = _CCCL_FRAGMENT(__derived_from_, _Dp, _Bp);
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#endif // ^^^ !_CCCL_NO_VARIABLE_TEMPLATES
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_LIBCUDACXX_END_NAMESPACE_STD
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#endif // _LIBCUDACXX___CONCEPTS_DERIVED_FROM_H
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