| //===----------------------------------------------------------------------===// | |
| // | |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. | |
| // See https://llvm.org/LICENSE.txt for license information. | |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception | |
| // | |
| //===----------------------------------------------------------------------===// | |
| #ifndef _LIBCPP___BIT_BIT_WIDTH_H | |
| #define _LIBCPP___BIT_BIT_WIDTH_H | |
| #include <__bit/bit_log2.h> | |
| #include <__config> | |
| #include <__type_traits/integer_traits.h> | |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) | |
| # pragma GCC system_header | |
| #endif | |
| #if _LIBCPP_STD_VER >= 20 | |
| _LIBCPP_BEGIN_NAMESPACE_STD | |
| template <__unsigned_integer _Tp> | |
| [[nodiscard]] constexpr int bit_width(_Tp __t) noexcept { | |
| return __t == 0 ? 0 : std::__bit_log2(__t) + 1; | |
| } | |
| _LIBCPP_END_NAMESPACE_STD | |
| #endif // _LIBCPP_STD_VER >= 20 | |
| #endif // _LIBCPP___BIT_BIT_WIDTH_H |