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ce7771902d
This patch updates the includes guards of the C++ 03 headers. This is part of https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc.
35 lines
1007 B
C++
35 lines
1007 B
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___CXX03___BIT_BIT_LOG2_H
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#define _LIBCPP___CXX03___BIT_BIT_LOG2_H
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#include <__cxx03/__bit/countl.h>
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#include <__cxx03/__concepts/arithmetic.h>
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#include <__cxx03/__config>
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#include <__cxx03/limits>
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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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#if _LIBCPP_STD_VER >= 20
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template <__libcpp_unsigned_integer _Tp>
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_LIBCPP_HIDE_FROM_ABI constexpr _Tp __bit_log2(_Tp __t) noexcept {
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return numeric_limits<_Tp>::digits - 1 - std::countl_zero(__t);
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}
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#endif // _LIBCPP_STD_VER >= 20
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___CXX03___BIT_BIT_LOG2_H
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