1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#ifndef _LIBCPP___BIT_HAS_SINGLE_BIT_H
10#define _LIBCPP___BIT_HAS_SINGLE_BIT_H
11
12#include <__config>
13#include <__type_traits/integer_traits.h>
14
15#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
16# pragma GCC system_header
17#endif
18
19_LIBCPP_PUSH_MACROS
20#include <__undef_macros>
21
22#if _LIBCPP_STD_VER >= 20
23
24_LIBCPP_BEGIN_NAMESPACE_STD
25
26template <__unsigned_integer _Tp>
27[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool has_single_bit(_Tp __t) noexcept {
28 return __t != 0 && (((__t & (__t - 1)) == 0));
29}
30
31_LIBCPP_END_NAMESPACE_STD
32
33#endif // _LIBCPP_STD_VER >= 20
34
35_LIBCPP_POP_MACROS
36
37#endif // _LIBCPP___BIT_HAS_SINGLE_BIT_H
38