1e78f53d1SNikolas Klauser //===----------------------------------------------------------------------===// 2e78f53d1SNikolas Klauser // 3e78f53d1SNikolas Klauser // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4e78f53d1SNikolas Klauser // See https://llvm.org/LICENSE.txt for license information. 5e78f53d1SNikolas Klauser // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6e78f53d1SNikolas Klauser // 7e78f53d1SNikolas Klauser //===----------------------------------------------------------------------===// 8e78f53d1SNikolas Klauser 9*ce777190SNikolas Klauser #ifndef _LIBCPP___CXX03___BIT_BIT_WIDTH_H 10*ce777190SNikolas Klauser #define _LIBCPP___CXX03___BIT_BIT_WIDTH_H 11e78f53d1SNikolas Klauser 1273fbae83SNikolas Klauser #include <__cxx03/__bit/bit_log2.h> 1373fbae83SNikolas Klauser #include <__cxx03/__concepts/arithmetic.h> 1473fbae83SNikolas Klauser #include <__cxx03/__config> 15e78f53d1SNikolas Klauser 16e78f53d1SNikolas Klauser #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 17e78f53d1SNikolas Klauser # pragma GCC system_header 18e78f53d1SNikolas Klauser #endif 19e78f53d1SNikolas Klauser 20e78f53d1SNikolas Klauser #if _LIBCPP_STD_VER >= 20 21e78f53d1SNikolas Klauser 22e78f53d1SNikolas Klauser _LIBCPP_BEGIN_NAMESPACE_STD 23e78f53d1SNikolas Klauser 24e78f53d1SNikolas Klauser template <__libcpp_unsigned_integer _Tp> 25e78f53d1SNikolas Klauser [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr int bit_width(_Tp __t) noexcept { 26e78f53d1SNikolas Klauser return __t == 0 ? 0 : std::__bit_log2(__t) + 1; 27e78f53d1SNikolas Klauser } 28e78f53d1SNikolas Klauser 29e78f53d1SNikolas Klauser _LIBCPP_END_NAMESPACE_STD 30e78f53d1SNikolas Klauser 31e78f53d1SNikolas Klauser #endif // _LIBCPP_STD_VER >= 20 32e78f53d1SNikolas Klauser 33*ce777190SNikolas Klauser #endif // _LIBCPP___CXX03___BIT_BIT_WIDTH_H 34