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Name	Size	Permission
backward	[ DIR ]	drwxr-xr-x
bits	[ DIR ]	drwxr-xr-x
debug	[ DIR ]	drwxr-xr-x
decimal	[ DIR ]	drwxr-xr-x
experimental	[ DIR ]	drwxr-xr-x
ext	[ DIR ]	drwxr-xr-x
parallel	[ DIR ]	drwxr-xr-x
profile	[ DIR ]	drwxr-xr-x
pstl	[ DIR ]	drwxr-xr-x
tr1	[ DIR ]	drwxr-xr-x
tr2	[ DIR ]	drwxr-xr-x
algorithm	2.91 KB	-rw-r--r--
any	17.81 KB	-rw-r--r--
array	11.4 KB	-rw-r--r--
atomic	42.59 KB	-rw-r--r--
bit	10.05 KB	-rw-r--r--
bitset	44.92 KB	-rw-r--r--
cassert	1.61 KB	-rw-r--r--
ccomplex	1.3 KB	-rw-r--r--
cctype	2.35 KB	-rw-r--r--
cerrno	1.73 KB	-rw-r--r--
cfenv	2 KB	-rw-r--r--
cfloat	1.84 KB	-rw-r--r--
charconv	16.49 KB	-rw-r--r--
chrono	29.18 KB	-rw-r--r--
cinttypes	2.11 KB	-rw-r--r--
ciso646	1.43 KB	-rw-r--r--
climits	1.87 KB	-rw-r--r--
clocale	1.86 KB	-rw-r--r--
cmath	48.22 KB	-rw-r--r--
codecvt	5.15 KB	-rw-r--r--
complex	55.28 KB	-rw-r--r--
complex.h	1.56 KB	-rw-r--r--
condition_variable	9.08 KB	-rw-r--r--
csetjmp	1.9 KB	-rw-r--r--
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cstdarg	1.82 KB	-rw-r--r--
cstdbool	1.37 KB	-rw-r--r--
cstddef	6.5 KB	-rw-r--r--
cstdint	2.28 KB	-rw-r--r--
cstdio	4.33 KB	-rw-r--r--
cstdlib	6.18 KB	-rw-r--r--
cstring	3.08 KB	-rw-r--r--
ctgmath	1.33 KB	-rw-r--r--
ctime	2.24 KB	-rw-r--r--
cuchar	2.16 KB	-rw-r--r--
cwchar	6.39 KB	-rw-r--r--
cwctype	2.73 KB	-rw-r--r--
cxxabi.h	21.5 KB	-rw-r--r--
deque	3.94 KB	-rw-r--r--
exception	4.69 KB	-rw-r--r--
execution	1.76 KB	-rw-r--r--
fenv.h	1.97 KB	-rw-r--r--
filesystem	1.4 KB	-rw-r--r--
forward_list	2.69 KB	-rw-r--r--
fstream	39.61 KB	-rw-r--r--
functional	40.09 KB	-rw-r--r--
future	49.35 KB	-rw-r--r--
initializer_list	2.9 KB	-rw-r--r--
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iosfwd	6.76 KB	-rw-r--r--
iostream	2.63 KB	-rw-r--r--
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iterator	2.71 KB	-rw-r--r--
limits	70.13 KB	-rw-r--r--
list	3.63 KB	-rw-r--r--
locale	1.45 KB	-rw-r--r--
map	3.89 KB	-rw-r--r--
math.h	4.47 KB	-rw-r--r--
memory	12.63 KB	-rw-r--r--
memory_resource	19.99 KB	-rw-r--r--
mutex	17.75 KB	-rw-r--r--
new	7.82 KB	-rw-r--r--
numeric	24.69 KB	-rw-r--r--
optional	36.98 KB	-rw-r--r--
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queue	2.41 KB	-rw-r--r--
random	1.65 KB	-rw-r--r--
ratio	19.37 KB	-rw-r--r--
regex	2.59 KB	-rw-r--r--
scoped_allocator	16.75 KB	-rw-r--r--
set	3.76 KB	-rw-r--r--
shared_mutex	21.43 KB	-rw-r--r--
sstream	27.86 KB	-rw-r--r--
stack	2.33 KB	-rw-r--r--
stdexcept	9.65 KB	-rw-r--r--
stdlib.h	2.2 KB	-rw-r--r--
streambuf	29.29 KB	-rw-r--r--
string	4.54 KB	-rw-r--r--
string_view	22.32 KB	-rw-r--r--
system_error	11.4 KB	-rw-r--r--
tgmath.h	1.33 KB	-rw-r--r--
thread	10.11 KB	-rw-r--r--
tuple	59.51 KB	-rw-r--r--
type_traits	88.05 KB	-rw-r--r--
typeindex	3.02 KB	-rw-r--r--
typeinfo	7.51 KB	-rw-r--r--
unordered_map	3.45 KB	-rw-r--r--
unordered_set	3.33 KB	-rw-r--r--
utility	12.23 KB	-rw-r--r--
valarray	39.62 KB	-rw-r--r--
variant	57.63 KB	-rw-r--r--
vector	4.23 KB	-rw-r--r--
version	6.58 KB	-rw-r--r--

Code Editor : bit

// <bit> -*- C++ -*-

// Copyright (C) 2018-2019 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
// <http://www.gnu.org/licenses/>.

/** @file include/bit
 *  This is a Standard C++ Library header.
 */

#ifndef _GLIBCXX_BIT
#define _GLIBCXX_BIT 1

#pragma GCC system_header

#if __cplusplus >= 201402L

#include <type_traits>
#include <limits>

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

template<typename _Tp>
    constexpr _Tp
    __rotl(_Tp __x, int __s) noexcept
    {
      constexpr auto _Nd = numeric_limits<_Tp>::digits;
      const int __r = __s % _Nd;
      if (__r == 0)
	return __x;
      else if (__r > 0)
	return (__x << __r) | (__x >> ((_Nd - __r) % _Nd));
      else
	return (__x >> -__r) | (__x << ((_Nd + __r) % _Nd)); // rotr(x, -r)
    }

template<typename _Tp>
    constexpr _Tp
    __rotr(_Tp __x, int __s) noexcept
    {
      constexpr auto _Nd = numeric_limits<_Tp>::digits;
      const int __r = __s % _Nd;
      if (__r == 0)
	return __x;
      else if (__r > 0)
	return (__x >> __r) | (__x << ((_Nd - __r) % _Nd));
      else
	return (__x << -__r) | (__x >> ((_Nd + __r) % _Nd)); // rotl(x, -r)
    }

template<typename _Tp>
    constexpr int
    __countl_zero(_Tp __x) noexcept
    {
      constexpr auto _Nd = numeric_limits<_Tp>::digits;

if (__x == 0)
        return _Nd;

constexpr auto _Nd_ull = numeric_limits<unsigned long long>::digits;
      constexpr auto _Nd_ul = numeric_limits<unsigned long>::digits;
      constexpr auto _Nd_u = numeric_limits<unsigned>::digits;

if _GLIBCXX17_CONSTEXPR (_Nd <= _Nd_u)
	{
	  constexpr int __diff = _Nd_u - _Nd;
	  return __builtin_clz(__x) - __diff;
	}
      else if _GLIBCXX17_CONSTEXPR (_Nd <= _Nd_ul)
	{
	  constexpr int __diff = _Nd_ul - _Nd;
	  return __builtin_clzl(__x) - __diff;
	}
      else if _GLIBCXX17_CONSTEXPR (_Nd <= _Nd_ull)
	{
	  constexpr int __diff = _Nd_ull - _Nd;
	  return __builtin_clzll(__x) - __diff;
	}
      else // (_Nd > _Nd_ull)
	{
	  static_assert(_Nd <= (2 * _Nd_ull),
			"Maximum supported integer size is 128-bit");

unsigned long long __high = __x >> _Nd_ull;
	  if (__high != 0)
	    {
	      constexpr int __diff = (2 * _Nd_ull) - _Nd;
	      return __builtin_clzll(__high) - __diff;
	    }
	  constexpr auto __max_ull = numeric_limits<unsigned long long>::max();
	  unsigned long long __low = __x & __max_ull;
	  return (_Nd - _Nd_ull) + __builtin_clzll(__low);
	}
    }

template<typename _Tp>
    constexpr int
    __countl_one(_Tp __x) noexcept
    {
      if (__x == numeric_limits<_Tp>::max())
        return numeric_limits<_Tp>::digits;
      return std::__countl_zero<_Tp>((_Tp)~__x);
    }

template<typename _Tp>
    constexpr int
    __countr_zero(_Tp __x) noexcept
    {
      constexpr auto _Nd = numeric_limits<_Tp>::digits;

if (__x == 0)
        return _Nd;

if _GLIBCXX17_CONSTEXPR (_Nd <= _Nd_u)
	return __builtin_ctz(__x);
      else if _GLIBCXX17_CONSTEXPR (_Nd <= _Nd_ul)
	return __builtin_ctzl(__x);
      else if _GLIBCXX17_CONSTEXPR (_Nd <= _Nd_ull)
	return __builtin_ctzll(__x);
      else // (_Nd > _Nd_ull)
	{
	  static_assert(_Nd <= (2 * _Nd_ull),
			"Maximum supported integer size is 128-bit");

constexpr auto __max_ull = numeric_limits<unsigned long long>::max();
	  unsigned long long __low = __x & __max_ull;
	  if (__low != 0)
	    return __builtin_ctzll(__low);
	  unsigned long long __high = __x >> _Nd_ull;
	  return __builtin_ctzll(__high) + _Nd_ull;
	}
    }

template<typename _Tp>
    constexpr int
    __countr_one(_Tp __x) noexcept
    {
      if (__x == numeric_limits<_Tp>::max())
        return numeric_limits<_Tp>::digits;
      return std::__countr_zero((_Tp)~__x);
    }

template<typename _Tp>
    constexpr int
    __popcount(_Tp __x) noexcept
    {
      constexpr auto _Nd = numeric_limits<_Tp>::digits;

if (__x == 0)
        return 0;

if _GLIBCXX17_CONSTEXPR (_Nd <= _Nd_u)
	return __builtin_popcount(__x);
      else if _GLIBCXX17_CONSTEXPR (_Nd <= _Nd_ul)
	return __builtin_popcountl(__x);
      else if _GLIBCXX17_CONSTEXPR (_Nd <= _Nd_ull)
	return __builtin_popcountll(__x);
      else // (_Nd > _Nd_ull)
	{
	  static_assert(_Nd <= (2 * _Nd_ull),
			"Maximum supported integer size is 128-bit");

constexpr auto __max_ull = numeric_limits<unsigned long long>::max();
	  unsigned long long __low = __x & __max_ull;
	  unsigned long long __high = __x >> _Nd_ull;
	  return __builtin_popcountll(__low) + __builtin_popcountll(__high);
	}
    }

template<typename _Tp>
    constexpr bool
    __ispow2(_Tp __x) noexcept
    { return std::__popcount(__x) == 1; }

template<typename _Tp>
    constexpr _Tp
    __ceil2(_Tp __x) noexcept
    {
      constexpr auto _Nd = numeric_limits<_Tp>::digits;
      if (__x == 0 || __x == 1)
        return 1;
      auto __shift_exponent = _Nd - std::__countl_zero((_Tp)(__x - 1u));
      // If the shift exponent equals _Nd then the correct result is not
      // representable as a value of _Tp, and so the result is undefined.
      // Want that undefined behaviour to be detected in constant expressions,
      // by UBSan, and by debug assertions.
#ifdef _GLIBCXX_HAVE_BUILTIN_IS_CONSTANT_EVALUATED
      if (!__builtin_is_constant_evaluated())
	__glibcxx_assert( __shift_exponent != numeric_limits<_Tp>::digits );
#endif
      using __promoted_type = decltype(__x << 1);
      if _GLIBCXX17_CONSTEXPR (!is_same<__promoted_type, _Tp>::value)
	{
	  // If __x undergoes integral promotion then shifting by _Nd is
	  // not undefined. In order to make the shift undefined, so that
	  // it is diagnosed in constant expressions and by UBsan, we also
	  // need to "promote" the shift exponent to be too large for the
	  // promoted type.
	  const int __extra_exp = sizeof(__promoted_type) / sizeof(_Tp) / 2;
	  __shift_exponent |= (__shift_exponent & _Nd) << __extra_exp;
	}
      return (_Tp)1u << __shift_exponent;
    }

template<typename _Tp>
    constexpr _Tp
    __floor2(_Tp __x) noexcept
    {
      constexpr auto _Nd = numeric_limits<_Tp>::digits;
      if (__x == 0)
        return 0;
      return (_Tp)1u << (_Nd - std::__countl_zero((_Tp)(__x >> 1)));
    }

template<typename _Tp>
    constexpr _Tp
    __log2p1(_Tp __x) noexcept
    {
      constexpr auto _Nd = numeric_limits<_Tp>::digits;
      return _Nd - std::__countl_zero(__x);
    }

#if __cplusplus > 201703L

#define __cpp_lib_bitops 201907L

template<typename _Tp, typename _Up, bool = is_integral_v<_Tp>>
    struct _If_is_unsigned_integer_type { };

template<typename _Up>
    struct _If_is_unsigned_integer_type<bool, _Up, true> { };

template<typename _Tp, typename _Up>
    struct _If_is_unsigned_integer_type<_Tp, _Up, true>
    : enable_if<is_same_v<_Tp, make_unsigned_t<_Tp>>, _Up> { };

template<typename _Tp, typename _Up = _Tp>
    using _If_is_unsigned_integer
      = typename _If_is_unsigned_integer_type<remove_cv_t<_Tp>, _Up>::type;

// [bit.rot], rotating

template<typename _Tp>
    [[nodiscard]] constexpr _If_is_unsigned_integer<_Tp>
    rotl(_Tp __x, int __s) noexcept
    { return std::__rotl(__x, __s); }

template<typename _Tp>
    [[nodiscard]] constexpr _If_is_unsigned_integer<_Tp>
    rotr(_Tp __x, int __s) noexcept
    { return std::__rotr(__x, __s); }

// [bit.count], counting

template<typename _Tp>
    constexpr _If_is_unsigned_integer<_Tp, int>
    countl_zero(_Tp __x) noexcept
    { return std::__countl_zero(__x); }

template<typename _Tp>
    constexpr _If_is_unsigned_integer<_Tp, int>
    countl_one(_Tp __x) noexcept
    { return std::__countl_one(__x); }

template<typename _Tp>
    constexpr _If_is_unsigned_integer<_Tp, int>
    countr_zero(_Tp __x) noexcept
    { return std::__countr_zero(__x); }

template<typename _Tp>
    constexpr _If_is_unsigned_integer<_Tp, int>
    countr_one(_Tp __x) noexcept
    { return std::__countr_one(__x); }

template<typename _Tp>
    constexpr _If_is_unsigned_integer<_Tp, int>
    popcount(_Tp __x) noexcept
    { return std::__popcount(__x); }

// [bit.pow.two], integral powers of 2

#define __cpp_lib_int_pow2 201806L

template<typename _Tp>
    constexpr _If_is_unsigned_integer<_Tp, bool>
    ispow2(_Tp __x) noexcept
    { return std::__ispow2(__x); }

template<typename _Tp>
    constexpr _If_is_unsigned_integer<_Tp>
    ceil2(_Tp __x) noexcept
    { return std::__ceil2(__x); }

template<typename _Tp>
    constexpr _If_is_unsigned_integer<_Tp>
    floor2(_Tp __x) noexcept
    { return std::__floor2(__x); }

template<typename _Tp>
    constexpr _If_is_unsigned_integer<_Tp>
    log2p1(_Tp __x) noexcept
    { return std::__log2p1(__x); }

#define __cpp_lib_endian 201907L

/// Byte order
  enum class endian
  {
    little = __ORDER_LITTLE_ENDIAN__,
    big    = __ORDER_BIG_ENDIAN__,
    native = __BYTE_ORDER__
  };
#endif // C++2a

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std

#endif // C++14
#endif // _GLIBCXX_BIT

${this.title}

Code Editor : bit