derek.holloway
7502bf64a4
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63 lines
2.3 KiB
C++
63 lines
2.3 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___UTILITY_DECLVAL_H
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#define _LIBCUDACXX___UTILITY_DECLVAL_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/__type_traits/void_t.h>
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_LIBCUDACXX_BEGIN_NAMESPACE_STD
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// When variable templates and noexcept function types are available, a faster
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// implementation of declval is available. It compiles approximately 2x faster
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// than the fallback. NOTE: this implementation causes nvcc < 12.4 to ICE and
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// MSVC < 19.39 to miscompile so we use the fallback instead. The use of the
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// `__identity_t` alias is help MSVC parse the declaration correctly.
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#if !defined(_CCCL_NO_VARIABLE_TEMPLATES) && !defined(_CCCL_NO_NOEXCEPT_FUNCTION_TYPE) \
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&& !_CCCL_CUDA_COMPILER(NVCC, <, 12, 4) && !_CCCL_COMPILER(MSVC, <, 19, 39)
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template <class _Tp>
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using __identity_t _CCCL_NODEBUG_ALIAS = _Tp;
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template <class _Tp, class = void>
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extern __identity_t<void (*)() noexcept> declval;
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template <class _Tp>
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extern __identity_t<_Tp && (*) () noexcept> declval<_Tp, void_t<_Tp&&>>;
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#else // ^^^ !_CCCL_NO_VARIABLE_TEMPLATES ^^^ / vvv _CCCL_NO_VARIABLE_TEMPLATES vvv
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// Suppress deprecation notice for volatile-qualified return type resulting
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// from volatile-qualified types _Tp.
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_CCCL_SUPPRESS_DEPRECATED_PUSH
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template <class _Tp>
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_LIBCUDACXX_HIDE_FROM_ABI _Tp&& __declval(int);
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template <class _Tp>
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_LIBCUDACXX_HIDE_FROM_ABI _Tp __declval(long);
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_CCCL_SUPPRESS_DEPRECATED_POP
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template <class _Tp>
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_LIBCUDACXX_HIDE_FROM_ABI decltype(_CUDA_VSTD::__declval<_Tp>(0)) declval() noexcept;
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#endif // _CCCL_NO_VARIABLE_TEMPLATES
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_LIBCUDACXX_END_NAMESPACE_STD
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#endif // _LIBCUDACXX___UTILITY_DECLVAL_H
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