derek.holloway
7502bf64a4
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78 lines
2.5 KiB
C++
78 lines
2.5 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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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___RANGES_ENABLE_VIEW_H
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#define _LIBCUDACXX___RANGES_ENABLE_VIEW_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/derived_from.h>
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#include <cuda/std/__concepts/same_as.h>
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#include <cuda/std/__type_traits/enable_if.h>
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#include <cuda/std/__type_traits/is_class.h>
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#include <cuda/std/__type_traits/remove_cv.h>
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#include <cuda/std/__type_traits/void_t.h>
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_LIBCUDACXX_BEGIN_NAMESPACE_RANGES
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struct view_base
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{};
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_LIBCUDACXX_BEGIN_NAMESPACE_RANGES_ABI
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#if !defined(_CCCL_NO_CONCEPTS)
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template <class _Derived>
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requires is_class_v<_Derived> && same_as<_Derived, remove_cv_t<_Derived>>
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class view_interface;
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#else // ^^^ !_CCCL_NO_CONCEPTS ^^^ / vvv _CCCL_NO_CONCEPTS vvv
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template <class _Derived, enable_if_t<is_class_v<_Derived> && same_as<_Derived, remove_cv_t<_Derived>>, int> = 0>
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class view_interface;
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#endif // _CCCL_NO_CONCEPTS
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_LIBCUDACXX_END_NAMESPACE_RANGES_ABI
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_CCCL_TEMPLATE(class _Op, class _Yp)
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_CCCL_REQUIRES(is_convertible_v<_Op*, view_interface<_Yp>*>)
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_LIBCUDACXX_HIDE_FROM_ABI void __is_derived_from_view_interface(const _Op*, const view_interface<_Yp>*);
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#if !defined(_CCCL_NO_CONCEPTS)
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template <class _Tp>
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_CCCL_INLINE_VAR constexpr bool enable_view = derived_from<_Tp, view_base> || requires {
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_CUDA_VRANGES::__is_derived_from_view_interface((_Tp*) nullptr, (_Tp*) nullptr);
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};
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#else // ^^^ !_CCCL_NO_CONCEPTS ^^^ / vvv _CCCL_NO_CONCEPTS vvv
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template <class _Tp, class = void>
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_CCCL_INLINE_VAR constexpr bool enable_view = derived_from<_Tp, view_base>;
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template <class _Tp>
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_CCCL_INLINE_VAR constexpr bool
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enable_view<_Tp, void_t<decltype(_CUDA_VRANGES::__is_derived_from_view_interface((_Tp*) nullptr, (_Tp*) nullptr))>> =
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true;
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#endif // _CCCL_NO_CONCEPTS
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_LIBCUDACXX_END_NAMESPACE_RANGES
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#endif // _LIBCUDACXX___RANGES_ENABLE_VIEW_H
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