6024e5c395
clang 20.0.0 (based on r547379) from build 12806354. Bug: http://b/379133546 Test: N/A Change-Id: I2eb8938af55d809de674be63cb30cf27e801862b Upstream-Commit: ad834e67b1105d15ef907f6255d4c96e8e733f57
39 lines
1.2 KiB
C++
39 lines
1.2 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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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___UTILITY_DECLVAL_H
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#define _LIBCPP___UTILITY_DECLVAL_H
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#include <__config>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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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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_LIBCPP_SUPPRESS_DEPRECATED_PUSH
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template <class _Tp>
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_Tp&& __declval(int);
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template <class _Tp>
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_Tp __declval(long);
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_LIBCPP_SUPPRESS_DEPRECATED_POP
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template <class _Tp>
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_LIBCPP_HIDE_FROM_ABI decltype(std::__declval<_Tp>(0)) declval() _NOEXCEPT {
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static_assert(!__is_same(_Tp, _Tp),
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"std::declval can only be used in an unevaluated context. "
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"It's likely that your current usage is trying to extract a value from the function.");
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}
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___UTILITY_DECLVAL_H
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