llvm-project/libcxx/include/bit

// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// 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
#define _LIBCPP_BIT

/*
    bit synopsis

namespace std {
  // [bit.cast], bit_cast
  template<class To, class From>
    constexpr To bit_cast(const From& from) noexcept; // C++20

  // [bit.byteswap], byteswap
  template<class T>
    constexpr T byteswap(T value) noexcept;      // C++23

  // [bit.pow.two], integral powers of 2
  template <class T>
    constexpr bool has_single_bit(T x) noexcept; // C++20
  template <class T>
    constexpr T bit_ceil(T x);                   // C++20
  template <class T>
    constexpr T bit_floor(T x) noexcept;         // C++20
  template <class T>
    constexpr int bit_width(T x) noexcept;       // C++20

  // [bit.rotate], rotating
  template<class T>
    constexpr T rotl(T x, int s) noexcept; // C++20
  template<class T>
    constexpr T rotr(T x, int s) noexcept; // C++20

  // [bit.count], counting
  template<class T>
    constexpr int countl_zero(T x) noexcept;  // C++20
  template<class T>
    constexpr int countl_one(T x) noexcept;   // C++20
  template<class T>
    constexpr int countr_zero(T x) noexcept;  // C++20
  template<class T>
    constexpr int countr_one(T x) noexcept;   // C++20
  template<class T>
    constexpr int popcount(T x) noexcept;     // C++20

  // [bit.endian], endian
  enum class endian {
    little = see below,        // C++20
    big = see below,           // C++20
    native = see below         // C++20
  };

} // namespace std

*/

#if __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
#  include <__cxx03/bit>
#else
#  include <__config>

#  if _LIBCPP_STD_VER >= 20
#    include <__bit/bit_cast.h>
#    include <__bit/bit_ceil.h>
#    include <__bit/bit_floor.h>
#    include <__bit/bit_log2.h>
#    include <__bit/bit_width.h>
#    include <__bit/countl.h>
#    include <__bit/countr.h>
#    include <__bit/endian.h>
#    include <__bit/has_single_bit.h>
#    include <__bit/popcount.h>
#    include <__bit/rotate.h>
#  endif

#  if _LIBCPP_STD_VER >= 23
#    include <__bit/byteswap.h>
#  endif

#  include <version>

#  if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#    pragma GCC system_header
#  endif

#  if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
#    include <cstdlib>
#    include <iosfwd>
#    include <limits>
#    include <type_traits>
#  endif
#endif // __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)

#endif // _LIBCPP_BIT