//===----------------------------------------------------------------------===//
//
// Part of libcu++, the C++ Standard Library for your entire system,
// 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
// SPDX-FileCopyrightText: Copyright (c) 2025 NVIDIA CORPORATION & AFFILIATES.
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCUDACXX___BIT_HAS_SINGLE_BIT_H
#define _LIBCUDACXX___BIT_HAS_SINGLE_BIT_H

#include <cuda/std/detail/__config>

#if defined(_CCCL_IMPLICIT_SYSTEM_HEADER_GCC)
#  pragma GCC system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_CLANG)
#  pragma clang system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC)
#  pragma system_header
#endif // no system header

#include <cuda/std/__bit/popcount.h>
#include <cuda/std/__concepts/concept_macros.h>
#include <cuda/std/__type_traits/is_unsigned_integer.h>

_LIBCUDACXX_BEGIN_NAMESPACE_STD

_CCCL_TEMPLATE(class _Tp)
_CCCL_REQUIRES(_CCCL_TRAIT(_CUDA_VSTD::__cccl_is_unsigned_integer, _Tp))
_CCCL_NODISCARD _LIBCUDACXX_HIDE_FROM_ABI constexpr bool has_single_bit(_Tp __t) noexcept
{
  return _CUDA_VSTD::popcount(__t) == 1;
}

_LIBCUDACXX_END_NAMESPACE_STD

#endif // _LIBCUDACXX___BIT_HAS_SINGLE_BIT_H
