bitset
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// <bitset> -*- C++ -*-
// Copyright (C) 2001-2025 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/>.
/*
* Copyright (c) 1998
* Silicon Graphics Computer Systems, Inc.
*
* Permission to use, copy, modify, distribute and sell this software
* and its documentation for any purpose is hereby granted without fee,
* provided that the above copyright notice appear in all copies and
* that both that copyright notice and this permission notice appear
* in supporting documentation. Silicon Graphics makes no
* representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied warranty.
*/
/** @file include/bitset
* This is a Standard C++ Library header.
*/
#ifndef _GLIBCXX_BITSET
#define _GLIBCXX_BITSET 1
#ifdef _GLIBCXX_SYSHDR
#pragma GCC system_header
#endif
#include <bits/functexcept.h> // For invalid_argument, out_of_range,
// overflow_error
#include <bits/stl_algobase.h> // For std::fill
#if _GLIBCXX_HOSTED
# include <string>
# include <iosfwd>
# include <bits/cxxabi_forced.h>
#endif
#if __cplusplus >= 201103L
# include <bits/functional_hash.h>
#endif
#define __glibcxx_want_constexpr_bitset
#include <bits/version.h>
#define _GLIBCXX_BITSET_BITS_PER_WORD (__CHAR_BIT__ * __SIZEOF_LONG__)
#define _GLIBCXX_BITSET_WORDS(__n) \
((__n) / _GLIBCXX_BITSET_BITS_PER_WORD + \
((__n) % _GLIBCXX_BITSET_BITS_PER_WORD == 0 ? 0 : 1))
#define _GLIBCXX_BITSET_BITS_PER_ULL (__CHAR_BIT__ * __SIZEOF_LONG_LONG__)
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_CONTAINER
/**
* Base class, general case. It is a class invariant that _Nw will be
* nonnegative.
*
* See documentation for bitset.
*/
template<size_t _Nw>
struct _Base_bitset
{
typedef unsigned long _WordT;
/// 0 is the least significant word.
_WordT _M_w[_Nw];
_GLIBCXX_CONSTEXPR _Base_bitset() _GLIBCXX_NOEXCEPT
: _M_w() { }
#if __cplusplus >= 201103L
constexpr _Base_bitset(unsigned long long __val) noexcept
: _M_w{ _WordT(__val)
#if __SIZEOF_LONG_LONG__ > __SIZEOF_LONG__
, _WordT(__val >> _GLIBCXX_BITSET_BITS_PER_WORD)
#endif
} { }
#else
_Base_bitset(unsigned long __val)
: _M_w()
{ _M_w[0] = __val; }
#endif
static _GLIBCXX_CONSTEXPR size_t
_S_whichword(size_t __pos) _GLIBCXX_NOEXCEPT
{ return __pos / _GLIBCXX_BITSET_BITS_PER_WORD; }
static _GLIBCXX_CONSTEXPR size_t
_S_whichbyte(size_t __pos) _GLIBCXX_NOEXCEPT
{ return (__pos % _GLIBCXX_BITSET_BITS_PER_WORD) / __CHAR_BIT__; }
static _GLIBCXX_CONSTEXPR size_t
_S_whichbit(size_t __pos) _GLIBCXX_NOEXCEPT
{ return __pos % _GLIBCXX_BITSET_BITS_PER_WORD; }
static _GLIBCXX_CONSTEXPR _WordT
_S_maskbit(size_t __pos) _GLIBCXX_NOEXCEPT
{ return (static_cast<_WordT>(1)) << _S_whichbit(__pos); }
_GLIBCXX14_CONSTEXPR _WordT&
_M_getword(size_t __pos) _GLIBCXX_NOEXCEPT
{ return _M_w[_S_whichword(__pos)]; }
_GLIBCXX_CONSTEXPR _WordT
_M_getword(size_t __pos) const _GLIBCXX_NOEXCEPT
{ return _M_w[_S_whichword(__pos)]; }
#if __cplusplus >= 201103L
constexpr const _WordT*
_M_getdata() const noexcept
{ return _M_w; }
#endif
_GLIBCXX23_CONSTEXPR _WordT&
_M_hiword() _GLIBCXX_NOEXCEPT
{ return _M_w[_Nw - 1]; }
_GLIBCXX_CONSTEXPR _WordT
_M_hiword() const _GLIBCXX_NOEXCEPT
{ return _M_w[_Nw - 1]; }
_GLIBCXX23_CONSTEXPR void
_M_do_and(const _Base_bitset<_Nw>& __x) _GLIBCXX_NOEXCEPT
{
for (size_t __i = 0; __i < _Nw; __i++)
_M_w[__i] &= __x._M_w[__i];
}
_GLIBCXX14_CONSTEXPR void
_M_do_or(const _Base_bitset<_Nw>& __x) _GLIBCXX_NOEXCEPT
{
for (size_t __i = 0; __i < _Nw; __i++)
_M_w[__i] |= __x._M_w[__i];
}
_GLIBCXX14_CONSTEXPR void
_M_do_xor(const _Base_bitset<_Nw>& __x) _GLIBCXX_NOEXCEPT
{
for (size_t __i = 0; __i < _Nw; __i++)
_M_w[__i] ^= __x._M_w[__i];
}
_GLIBCXX14_CONSTEXPR void
_M_do_left_shift(size_t __shift) _GLIBCXX_NOEXCEPT;
_GLIBCXX14_CONSTEXPR void
_M_do_right_shift(size_t __shift) _GLIBCXX_NOEXCEPT;
_GLIBCXX14_CONSTEXPR void
_M_do_flip() _GLIBCXX_NOEXCEPT
{
for (size_t __i = 0; __i < _Nw; __i++)
_M_w[__i] = ~_M_w[__i];
}
_GLIBCXX14_CONSTEXPR void
_M_do_set() _GLIBCXX_NOEXCEPT
{
#if __cplusplus >= 201402L
if (__builtin_is_constant_evaluated())
{
for (_WordT& __w : _M_w)
__w = ~static_cast<_WordT>(0);;
return;
}
#endif
__builtin_memset(_M_w, 0xFF, _Nw * sizeof(_WordT));
}
_GLIBCXX14_CONSTEXPR void
_M_do_reset() _GLIBCXX_NOEXCEPT
{
#if __cplusplus >= 201402L
if (__builtin_is_constant_evaluated())
{
for (_WordT& __w : _M_w)
__w = 0;
return;
}
#endif
__builtin_memset(_M_w, 0, _Nw * sizeof(_WordT));
}
_GLIBCXX14_CONSTEXPR bool
_M_is_equal(const _Base_bitset<_Nw>& __x) const _GLIBCXX_NOEXCEPT
{
#if __cplusplus >= 201402L
if (__builtin_is_constant_evaluated())
{
for (size_t __i = 0; __i < _Nw; ++__i)
if (_M_w[__i] != __x._M_w[__i])
return false;
return true;
}
#endif
return !__builtin_memcmp(_M_w, __x._M_w, _Nw * sizeof(_WordT));
}
template<size_t _Nb>
_GLIBCXX14_CONSTEXPR bool
_M_are_all() const _GLIBCXX_NOEXCEPT
{
for (size_t __i = 0; __i < _Nw - 1; __i++)
if (_M_w[__i] != ~static_cast<_WordT>(0))
return false;
return _M_hiword() == (~static_cast<_WordT>(0)
>> (_Nw * _GLIBCXX_BITSET_BITS_PER_WORD
- _Nb));
}
_GLIBCXX14_CONSTEXPR bool
_M_is_any() const _GLIBCXX_NOEXCEPT
{
for (size_t __i = 0; __i < _Nw; __i++)
if (_M_w[__i] != static_cast<_WordT>(0))
return true;
return false;
}
_GLIBCXX14_CONSTEXPR size_t
_M_do_count() const _GLIBCXX_NOEXCEPT
{
size_t __result = 0;
for (size_t __i = 0; __i < _Nw; __i++)
__result += __builtin_popcountl(_M_w[__i]);
return __result;
}
_GLIBCXX14_CONSTEXPR unsigned long
_M_do_to_ulong() const;
#if __cplusplus >= 201103L
_GLIBCXX14_CONSTEXPR unsigned long long
_M_do_to_ullong() const;
#endif
// find first "on" bit
_GLIBCXX14_CONSTEXPR size_t
_M_do_find_first(size_t) const _GLIBCXX_NOEXCEPT;
// find the next "on" bit that follows "prev"
_GLIBCXX14_CONSTEXPR size_t
_M_do_find_next(size_t, size_t) const _GLIBCXX_NOEXCEPT;
};
// Definitions of non-inline functions from _Base_bitset.
template<size_t _Nw>
_GLIBCXX14_CONSTEXPR void
_Base_bitset<_Nw>::_M_do_left_shift(size_t __shift) _GLIBCXX_NOEXCEPT
{
if (__builtin_expect(__shift != 0, 1))
{
const size_t __wshift = __shift / _GLIBCXX_BITSET_BITS_PER_WORD;
const size_t __offset = __shift % _GLIBCXX_BITSET_BITS_PER_WORD;
if (__offset == 0)
for (size_t __n = _Nw - 1; __n >= __wshift; --__n)
_M_w[__n] = _M_w[__n - __wshift];
else
{
const size_t __sub_offset = (_GLIBCXX_BITSET_BITS_PER_WORD
- __offset);
for (size_t __n = _Nw - 1; __n > __wshift; --__n)
_M_w[__n] = ((_M_w[__n - __wshift] << __offset)
| (_M_w[__n - __wshift - 1] >> __sub_offset));
_M_w[__wshift] = _M_w[0] << __offset;
}
std::fill(_M_w + 0, _M_w + __wshift, static_cast<_WordT>(0));
}
}
template<size_t _Nw>
_GLIBCXX14_CONSTEXPR void
_Base_bitset<_Nw>::_M_do_right_shift(size_t __shift) _GLIBCXX_NOEXCEPT
{
if (__builtin_expect(__shift != 0, 1))
{
const size_t __wshift = __shift / _GLIBCXX_BITSET_BITS_PER_WORD;
const size_t __offset = __shift % _GLIBCXX_BITSET_BITS_PER_WORD;
const size_t __limit = _Nw - __wshift - 1;
if (__offset == 0)
for (size_t __n = 0; __n <= __limit; ++__n)
_M_w[__n] = _M_w[__n + __wshift];
else
{
const size_t __sub_offset = (_GLIBCXX_BITSET_BITS_PER_WORD
- __offset);
for (size_t __n = 0; __n < __limit; ++__n)
_M_w[__n] = ((_M_w[__n + __wshift] >> __offset)
| (_M_w[__n + __wshift + 1] << __sub_offset));
_M_w[__limit] = _M_w[_Nw-1] >> __offset;
}
std::fill(_M_w + __limit + 1, _M_w + _Nw, static_cast<_WordT>(0));
}
}
template<size_t _Nw>
_GLIBCXX14_CONSTEXPR unsigned long
_Base_bitset<_Nw>::_M_do_to_ulong() const
{
for (size_t __i = 1; __i < _Nw; ++__i)
if (_M_w[__i])
__throw_overflow_error(__N("_Base_bitset::_M_do_to_ulong"));
return _M_w[0];
}
#if __cplusplus >= 201103L
template<size_t _Nw>
_GLIBCXX14_CONSTEXPR unsigned long long
_Base_bitset<_Nw>::_M_do_to_ullong() const
{
#if __SIZEOF_LONG_LONG__ == __SIZEOF_LONG__
return _M_do_to_ulong();
#else
for (size_t __i = 2; __i < _Nw; ++__i)
if (_M_w[__i])
__throw_overflow_error(__N("_Base_bitset::_M_do_to_ullong"));
return _M_w[0] + (static_cast<unsigned long long>(_M_w[1])
<< _GLIBCXX_BITSET_BITS_PER_WORD);
#endif
}
#endif // C++11
template<size_t _Nw>
_GLIBCXX14_CONSTEXPR size_t
_Base_bitset<_Nw>::
_M_do_find_first(size_t __not_found) const _GLIBCXX_NOEXCEPT
{
for (size_t __i = 0; __i < _Nw; __i++)
{
_WordT __thisword = _M_w[__i];
if (__thisword != static_cast<_WordT>(0))
return (__i * _GLIBCXX_BITSET_BITS_PER_WORD
+ __builtin_ctzl(__thisword));
}
// not found, so return an indication of failure.
return __not_found;
}
template<size_t _Nw>
_GLIBCXX14_CONSTEXPR size_t
_Base_bitset<_Nw>::
_M_do_find_next(size_t __prev, size_t __not_found) const _GLIBCXX_NOEXCEPT
{
// make bound inclusive
++__prev;
// check out of bounds
if (__prev >= _Nw * _GLIBCXX_BITSET_BITS_PER_WORD)
return __not_found;
// search first word
size_t __i = _S_whichword(__prev);
_WordT __thisword = _M_w[__i];
// mask off bits below bound
__thisword &= (~static_cast<_WordT>(0)) << _S_whichbit(__prev);
if (__thisword != static_cast<_WordT>(0))
return (__i * _GLIBCXX_BITSET_BITS_PER_WORD
+ __builtin_ctzl(__thisword));
// check subsequent words
__i++;
for (; __i < _Nw; __i++)
{
__thisword = _M_w[__i];
if (__thisword != static_cast<_WordT>(0))
return (__i * _GLIBCXX_BITSET_BITS_PER_WORD
+ __builtin_ctzl(__thisword));
}
// not found, so return an indication of failure.
return __not_found;
} // end _M_do_find_next
/**
* Base class, specialization for a single word.
*
* See documentation for bitset.
*/
template<>
struct _Base_bitset<1>
{
typedef unsigned long _WordT;
_WordT _M_w;
_GLIBCXX_CONSTEXPR _Base_bitset() _GLIBCXX_NOEXCEPT
: _M_w(0)
{ }
#if __cplusplus >= 201103L
constexpr _Base_bitset(unsigned long long __val) noexcept
#else
_Base_bitset(unsigned long __val)
#endif
: _M_w(__val)
{ }
static _GLIBCXX_CONSTEXPR size_t
_S_whichword(size_t __pos) _GLIBCXX_NOEXCEPT
{ return __pos / _GLIBCXX_BITSET_BITS_PER_WORD; }
static _GLIBCXX_CONSTEXPR size_t
_S_whichbyte(size_t __pos) _GLIBCXX_NOEXCEPT
{ return (__pos % _GLIBCXX_BITSET_BITS_PER_WORD) / __CHAR_BIT__; }
static _GLIBCXX_CONSTEXPR size_t
_S_whichbit(size_t __pos) _GLIBCXX_NOEXCEPT
{ return __pos % _GLIBCXX_BITSET_BITS_PER_WORD; }
static _GLIBCXX_CONSTEXPR _WordT
_S_maskbit(size_t __pos) _GLIBCXX_NOEXCEPT
{ return (static_cast<_WordT>(1)) << _S_whichbit(__pos); }
_GLIBCXX14_CONSTEXPR _WordT&
_M_getword(size_t) _GLIBCXX_NOEXCEPT
{ return _M_w; }
_GLIBCXX_CONSTEXPR _WordT
_M_getword(size_t) const _GLIBCXX_NOEXCEPT
{ return _M_w; }
#if __cplusplus >= 201103L
constexpr const _WordT*
_M_getdata() const noexcept
{ return &_M_w; }
#endif
_GLIBCXX14_CONSTEXPR _WordT&
_M_hiword() _GLIBCXX_NOEXCEPT
{ return _M_w; }
_GLIBCXX_CONSTEXPR _WordT
_M_hiword() const _GLIBCXX_NOEXCEPT
{ return _M_w; }
_GLIBCXX14_CONSTEXPR void
_M_do_and(const _Base_bitset<1>& __x) _GLIBCXX_NOEXCEPT
{ _M_w &= __x._M_w; }
_GLIBCXX14_CONSTEXPR void
_M_do_or(const _Base_bitset<1>& __x) _GLIBCXX_NOEXCEPT
{ _M_w |= __x._M_w; }
_GLIBCXX14_CONSTEXPR void
_M_do_xor(const _Base_bitset<1>& __x) _GLIBCXX_NOEXCEPT
{ _M_w ^= __x._M_w; }
_GLIBCXX14_CONSTEXPR void
_M_do_left_shift(size_t __shift) _GLIBCXX_NOEXCEPT
{ _M_w <<= __shift; }
_GLIBCXX14_CONSTEXPR void
_M_do_right_shift(size_t __shift) _GLIBCXX_NOEXCEPT
{ _M_w >>= __shift; }
_GLIBCXX14_CONSTEXPR void
_M_do_flip() _GLIBCXX_NOEXCEPT
{ _M_w = ~_M_w; }
_GLIBCXX14_CONSTEXPR void
_M_do_set() _GLIBCXX_NOEXCEPT
{ _M_w = ~static_cast<_WordT>(0); }
_GLIBCXX14_CONSTEXPR void
_M_do_reset() _GLIBCXX_NOEXCEPT
{ _M_w = 0; }
_GLIBCXX14_CONSTEXPR bool
_M_is_equal(const _Base_bitset<1>& __x) const _GLIBCXX_NOEXCEPT
{ return _M_w == __x._M_w; }
template<size_t _Nb>
_GLIBCXX14_CONSTEXPR bool
_M_are_all() const _GLIBCXX_NOEXCEPT
{ return _M_w == (~static_cast<_WordT>(0)
>> (_GLIBCXX_BITSET_BITS_PER_WORD - _Nb)); }
_GLIBCXX14_CONSTEXPR bool
_M_is_any() const _GLIBCXX_NOEXCEPT
{ return _M_w != 0; }
_GLIBCXX14_CONSTEXPR size_t
_M_do_count() const _GLIBCXX_NOEXCEPT
{ return __builtin_popcountl(_M_w); }
_GLIBCXX14_CONSTEXPR unsigned long
_M_do_to_ulong() const _GLIBCXX_NOEXCEPT
{ return _M_w; }
#if __cplusplus >= 201103L
constexpr unsigned long long
_M_do_to_ullong() const noexcept
{ return _M_w; }
#endif
_GLIBCXX14_CONSTEXPR size_t
_M_do_find_first(size_t __not_found) const _GLIBCXX_NOEXCEPT
{
if (_M_w != 0)
return __builtin_ctzl(_M_w);
else
return __not_found;
}
// find the next "on" bit that follows "prev"
_GLIBCXX14_CONSTEXPR size_t
_M_do_find_next(size_t __prev, size_t __not_found) const
_GLIBCXX_NOEXCEPT
{
++__prev;
if (__prev >= ((size_t) _GLIBCXX_BITSET_BITS_PER_WORD))
return __not_found;
_WordT __x = _M_w >> __prev;
if (__x != 0)
return __builtin_ctzl(__x) + __prev;
else
return __not_found;
}
};
/**
* Base class, specialization for no storage (zero-length %bitset).
*
* See documentation for bitset.
*/
template<>
struct _Base_bitset<0>
{
typedef unsigned long _WordT;
_GLIBCXX_CONSTEXPR _Base_bitset() _GLIBCXX_NOEXCEPT
{ }
#if __cplusplus >= 201103L
constexpr _Base_bitset(unsigned long long) noexcept
#else
_Base_bitset(unsigned long)
#endif
{ }
static _GLIBCXX_CONSTEXPR size_t
_S_whichword(size_t __pos) _GLIBCXX_NOEXCEPT
{ return __pos / _GLIBCXX_BITSET_BITS_PER_WORD; }
static _GLIBCXX_CONSTEXPR size_t
_S_whichbyte(size_t __pos) _GLIBCXX_NOEXCEPT
{ return (__pos % _GLIBCXX_BITSET_BITS_PER_WORD) / __CHAR_BIT__; }
static _GLIBCXX_CONSTEXPR size_t
_S_whichbit(size_t __pos) _GLIBCXX_NOEXCEPT
{ return __pos % _GLIBCXX_BITSET_BITS_PER_WORD; }
static _GLIBCXX_CONSTEXPR _WordT
_S_maskbit(size_t __pos) _GLIBCXX_NOEXCEPT
{ return (static_cast<_WordT>(1)) << _S_whichbit(__pos); }
// This would normally give access to the data. The bounds-checking
// in the bitset class will prevent the user from getting this far,
// but this must fail if the user calls _Unchecked_set directly.
// Let's not penalize zero-length users unless they actually
// make an unchecked call; all the memory ugliness is therefore
// localized to this single should-never-get-this-far function.
__attribute__((__noreturn__))
_WordT&
_M_getword(size_t) _GLIBCXX_NOEXCEPT
{ __throw_out_of_range(__N("_Base_bitset::_M_getword")); }
_GLIBCXX_CONSTEXPR _WordT
_M_getword(size_t) const _GLIBCXX_NOEXCEPT
{ return 0; }
_GLIBCXX_CONSTEXPR _WordT
_M_hiword() const _GLIBCXX_NOEXCEPT
{ return 0; }
_GLIBCXX14_CONSTEXPR void
_M_do_and(const _Base_bitset<0>&) _GLIBCXX_NOEXCEPT
{ }
_GLIBCXX14_CONSTEXPR void
_M_do_or(const _Base_bitset<0>&) _GLIBCXX_NOEXCEPT
{ }
_GLIBCXX14_CONSTEXPR void
_M_do_xor(const _Base_bitset<0>&) _GLIBCXX_NOEXCEPT
{ }
_GLIBCXX14_CONSTEXPR void
_M_do_left_shift(size_t) _GLIBCXX_NOEXCEPT
{ }
_GLIBCXX14_CONSTEXPR void
_M_do_right_shift(size_t) _GLIBCXX_NOEXCEPT
{ }
_GLIBCXX14_CONSTEXPR void
_M_do_flip() _GLIBCXX_NOEXCEPT
{ }
_GLIBCXX14_CONSTEXPR void
_M_do_set() _GLIBCXX_NOEXCEPT
{ }
_GLIBCXX14_CONSTEXPR void
_M_do_reset() _GLIBCXX_NOEXCEPT
{ }
// Are all empty bitsets equal to each other? Are they equal to
// themselves? How to compare a thing which has no state? What is
// the sound of one zero-length bitset clapping?
_GLIBCXX_CONSTEXPR bool
_M_is_equal(const _Base_bitset<0>&) const _GLIBCXX_NOEXCEPT
{ return true; }
template<size_t _Nb>
_GLIBCXX_CONSTEXPR bool
_M_are_all() const _GLIBCXX_NOEXCEPT
{ return true; }
_GLIBCXX_CONSTEXPR bool
_M_is_any() const _GLIBCXX_NOEXCEPT
{ return false; }
_GLIBCXX_CONSTEXPR size_t
_M_do_count() const _GLIBCXX_NOEXCEPT
{ return 0; }
_GLIBCXX_CONSTEXPR unsigned long
_M_do_to_ulong() const _GLIBCXX_NOEXCEPT
{ return 0; }
#if __cplusplus >= 201103L
constexpr unsigned long long
_M_do_to_ullong() const noexcept
{ return 0; }
#endif
// Normally "not found" is the size, but that could also be
// misinterpreted as an index in this corner case. Oh well.
_GLIBCXX_CONSTEXPR size_t
_M_do_find_first(size_t) const _GLIBCXX_NOEXCEPT
{ return 0; }
_GLIBCXX_CONSTEXPR size_t
_M_do_find_next(size_t, size_t) const _GLIBCXX_NOEXCEPT
{ return 0; }
};
// Helper class to zero out the unused high-order bits in the highest word.
template<size_t _Extrabits>
struct _Sanitize
{
typedef unsigned long _WordT;
static _GLIBCXX14_CONSTEXPR void
_S_do_sanitize(_WordT& __val) _GLIBCXX_NOEXCEPT
{ __val &= ~((~static_cast<_WordT>(0)) << _Extrabits); }
};
template<>
struct _Sanitize<0>
{
typedef unsigned long _WordT;
static _GLIBCXX14_CONSTEXPR void
_S_do_sanitize(_WordT) _GLIBCXX_NOEXCEPT { }
};
#if __cplusplus >= 201103L
template<size_t _Nb, bool = (_Nb < _GLIBCXX_BITSET_BITS_PER_ULL)>
struct _Sanitize_val
{
static constexpr unsigned long long
_S_do_sanitize_val(unsigned long long __val)
{ return __val; }
};
template<size_t _Nb>
struct _Sanitize_val<_Nb, true>
{
static constexpr unsigned long long
_S_do_sanitize_val(unsigned long long __val)
{ return __val & ~((~static_cast<unsigned long long>(0)) << _Nb); }
};
namespace __bitset
{
#if _GLIBCXX_HOSTED
template<typename _CharT>
using __string = std::basic_string<_CharT>;
#else
template<typename _CharT>
struct __string
{
using size_type = size_t;
static constexpr size_type npos = size_type(-1);
struct traits_type
{
static _GLIBCXX14_CONSTEXPR size_t
length(const _CharT* __s) noexcept
{
size_t __n = 0;
while (__s[__n])
__n++;
return __n;
}
static constexpr bool
eq(_CharT __l, _CharT __r) noexcept
{ return __l == __r; }
};
};
#endif // HOSTED
} // namespace __bitset
#endif // C++11
/**
* @brief The %bitset class represents a @e fixed-size sequence of bits.
* @ingroup utilities
*
* (Note that %bitset does @e not meet the formal requirements of a
* <a href="tables.html#65">container</a>. Mainly, it lacks iterators.)
*
* The template argument, @a Nb, may be any non-negative number,
* specifying the number of bits (e.g., "0", "12", "1024*1024").
*
* In the general unoptimized case, storage is allocated in word-sized
* blocks. Let B be the number of bits in a word, then (Nb+(B-1))/B
* words will be used for storage. B - Nb%B bits are unused. (They are
* the high-order bits in the highest word.) It is a class invariant
* that those unused bits are always zero.
*
* If you think of %bitset as <em>a simple array of bits</em>, be
* aware that your mental picture is reversed: a %bitset behaves
* the same way as bits in integers do, with the bit at index 0 in
* the <em>least significant / right-hand</em> position, and the bit at
* index Nb-1 in the <em>most significant / left-hand</em> position.
* Thus, unlike other containers, a %bitset's index <em>counts from
* right to left</em>, to put it very loosely.
*
* This behavior is preserved when translating to and from strings. For
* example, the first line of the following program probably prints
* <em>b(&apos;a&apos;) is 0001100001</em> on a modern ASCII system.
*
* @code
* #include <bitset>
* #include <iostream>
* #include <sstream>
*
* using namespace std;
*
* int main()
* {
* long a = 'a';
* bitset<10> b(a);
*
* cout << "b('a') is " << b << endl;
*
* ostringstream s;
* s << b;
* string str = s.str();
* cout << "index 3 in the string is " << str[3] << " but\n"
* << "index 3 in the bitset is " << b[3] << endl;
* }
* @endcode
*
* Also see:
* https://gcc.gnu.org/onlinedocs/libstdc++/manual/ext_containers.html
* for a description of extensions.
*
* Most of the actual code isn't contained in %bitset<> itself, but in the
* base class _Base_bitset. The base class works with whole words, not with
* individual bits. This allows us to specialize _Base_bitset for the
* important special case where the %bitset is only a single word.
*
* Extra confusion can result due to the fact that the storage for
* _Base_bitset @e is a regular array, and is indexed as such. This is
* carefully encapsulated.
*/
template<size_t _Nb>
class bitset
: private _Base_bitset<_GLIBCXX_BITSET_WORDS(_Nb)>
{
private:
typedef _Base_bitset<_GLIBCXX_BITSET_WORDS(_Nb)> _Base;
typedef unsigned long _WordT;
#if _GLIBCXX_HOSTED
template<class _CharT, class _Traits, class _Alloc>
_GLIBCXX23_CONSTEXPR
void
_M_check_initial_position(const std::basic_string<_CharT, _Traits, _Alloc>& __s,
size_t __position) const
{
if (__position > __s.size())
__throw_out_of_range_fmt(__N("bitset::bitset: __position "
"(which is %zu) > __s.size() "
"(which is %zu)"),
__position, __s.size());
}
#endif // HOSTED
_GLIBCXX23_CONSTEXPR
void _M_check(size_t __position, const char *__s) const
{
if (__position >= _Nb)
__throw_out_of_range_fmt(__N("%s: __position (which is %zu) "
">= _Nb (which is %zu)"),
__s, __position, _Nb);
}
_GLIBCXX23_CONSTEXPR
void
_M_do_sanitize() _GLIBCXX_NOEXCEPT
{
typedef _Sanitize<_Nb % _GLIBCXX_BITSET_BITS_PER_WORD> __sanitize_type;
__sanitize_type::_S_do_sanitize(this->_M_hiword());
}
#if __cplusplus >= 201103L
friend struct std::hash<bitset>;
#endif
public:
/**
* This encapsulates the concept of a single bit. An instance of this
* class is a proxy for an actual bit; this way the individual bit
* operations are done as faster word-size bitwise instructions.
*
* Most users will never need to use this class directly; conversions
* to and from bool are automatic and should be transparent. Overloaded
* operators help to preserve the illusion.
*
* (On a typical system, this <em>bit %reference</em> is 64
* times the size of an actual bit. Ha.)
*/
class reference
{
friend class bitset;
_WordT* _M_wp;
size_t _M_bpos;
_GLIBCXX23_CONSTEXPR
reference(bitset& __b, size_t __pos) _GLIBCXX_NOEXCEPT
{
_M_wp = &__b._M_getword(__pos);
_M_bpos = _Base::_S_whichbit(__pos);
}
public:
#if __cplusplus >= 201103L
reference(const reference&) = default;
#endif
#if __cplusplus > 202002L && __cpp_constexpr_dynamic_alloc
constexpr
#endif
~reference() _GLIBCXX_NOEXCEPT
{ }
// For b[i] = __x;
_GLIBCXX23_CONSTEXPR
reference&
operator=(bool __x) _GLIBCXX_NOEXCEPT
{
if (__x)
*_M_wp |= _Base::_S_maskbit(_M_bpos);
else
*_M_wp &= ~_Base::_S_maskbit(_M_bpos);
return *this;
}
// For b[i] = b[__j];
_GLIBCXX23_CONSTEXPR
reference&
operator=(const reference& __j) _GLIBCXX_NOEXCEPT
{
if ((*(__j._M_wp) & _Base::_S_maskbit(__j._M_bpos)))
*_M_wp |= _Base::_S_maskbit(_M_bpos);
else
*_M_wp &= ~_Base::_S_maskbit(_M_bpos);
return *this;
}
// Flips the bit
_GLIBCXX23_CONSTEXPR
bool
operator~() const _GLIBCXX_NOEXCEPT
{ return (*(_M_wp) & _Base::_S_maskbit(_M_bpos)) == 0; }
// For __x = b[i];
_GLIBCXX23_CONSTEXPR
operator bool() const _GLIBCXX_NOEXCEPT
{ return (*(_M_wp) & _Base::_S_maskbit(_M_bpos)) != 0; }
// For b[i].flip();
_GLIBCXX23_CONSTEXPR
reference&
flip() _GLIBCXX_NOEXCEPT
{
*_M_wp ^= _Base::_S_maskbit(_M_bpos);
return *this;
}
};
friend class reference;
// 23.3.5.1 constructors:
/// All bits set to zero.
_GLIBCXX_CONSTEXPR bitset() _GLIBCXX_NOEXCEPT
{ }
/// Initial bits bitwise-copied from a single word (others set to zero).
#if __cplusplus >= 201103L
constexpr bitset(unsigned long long __val) noexcept
: _Base(_Sanitize_val<_Nb>::_S_do_sanitize_val(__val)) { }
#else
bitset(unsigned long __val)
: _Base(__val)
{ _M_do_sanitize(); }
#endif
#if _GLIBCXX_HOSTED
/**
* Use a subset of a string.
* @param __s A string of @a 0 and @a 1 characters.
* @param __position Index of the first character in @a __s to use;
* defaults to zero.
* @throw std::out_of_range If @a pos is bigger the size of @a __s.
* @throw std::invalid_argument If a character appears in the string
* which is neither @a 0 nor @a 1.
*/
template<class _CharT, class _Traits, class _Alloc>
_GLIBCXX23_CONSTEXPR
explicit
bitset(const std::basic_string<_CharT, _Traits, _Alloc>& __s,
size_t __position = 0)
: _Base()
{
_M_check_initial_position(__s, __position);
_M_copy_from_string(__s, __position,
std::basic_string<_CharT, _Traits, _Alloc>::npos,
_CharT('0'), _CharT('1'));
}
/**
* Use a subset of a string.
* @param __s A string of @a 0 and @a 1 characters.
* @param __position Index of the first character in @a __s to use.
* @param __n The number of characters to copy.
* @throw std::out_of_range If @a __position is bigger the size
* of @a __s.
* @throw std::invalid_argument If a character appears in the string
* which is neither @a 0 nor @a 1.
*/
template<class _CharT, class _Traits, class _Alloc>
_GLIBCXX23_CONSTEXPR
bitset(const std::basic_string<_CharT, _Traits, _Alloc>& __s,
size_t __position, size_t __n)
: _Base()
{
_M_check_initial_position(__s, __position);
_M_copy_from_string(__s, __position, __n, _CharT('0'), _CharT('1'));
}
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 396. what are characters zero and one.
template<class _CharT, class _Traits, class _Alloc>
_GLIBCXX23_CONSTEXPR
bitset(const std::basic_string<_CharT, _Traits, _Alloc>& __s,
size_t __position, size_t __n,
_CharT __zero, _CharT __one = _CharT('1'))
: _Base()
{
_M_check_initial_position(__s, __position);
_M_copy_from_string(__s, __position, __n, __zero, __one);
}
#endif // HOSTED
#if __cplusplus >= 201103L
/**
* Construct from a character %array.
* @param __str An %array of characters @a zero and @a one.
* @param __n The number of characters to use.
* @param __zero The character corresponding to the value 0.
* @param __one The character corresponding to the value 1.
* @throw std::invalid_argument If a character appears in the string
* which is neither @a __zero nor @a __one.
*/
template<typename _CharT>
[[__gnu__::__nonnull__]]
_GLIBCXX23_CONSTEXPR
explicit
bitset(const _CharT* __str,
typename __bitset::__string<_CharT>::size_type __n
= __bitset::__string<_CharT>::npos,
_CharT __zero = _CharT('0'), _CharT __one = _CharT('1'))
: _Base()
{
#if _GLIBCXX_HOSTED
if (!__str)
__throw_logic_error(__N("bitset::bitset(const _CharT*, ...)"));
#endif
using _Traits = typename __bitset::__string<_CharT>::traits_type;
if (__n == __bitset::__string<_CharT>::npos)
__n = _Traits::length(__str);
_M_copy_from_ptr<_CharT, _Traits>(__str, __n, 0, __n, __zero, __one);
}
#endif // C++11
// 23.3.5.2 bitset operations:
///@{
/**
* Operations on bitsets.
* @param __rhs A same-sized bitset.
*
* These should be self-explanatory.
*/
_GLIBCXX23_CONSTEXPR
bitset<_Nb>&
operator&=(const bitset<_Nb>& __rhs) _GLIBCXX_NOEXCEPT
{
this->_M_do_and(__rhs);
return *this;
}
_GLIBCXX23_CONSTEXPR
bitset<_Nb>&
operator|=(const bitset<_Nb>& __rhs) _GLIBCXX_NOEXCEPT
{
this->_M_do_or(__rhs);
return *this;
}
_GLIBCXX23_CONSTEXPR
bitset<_Nb>&
operator^=(const bitset<_Nb>& __rhs) _GLIBCXX_NOEXCEPT
{
this->_M_do_xor(__rhs);
return *this;
}
///@}
///@{
/**
* Operations on bitsets.
* @param __position The number of places to shift.
*
* These should be self-explanatory.
*/
_GLIBCXX23_CONSTEXPR
bitset<_Nb>&
operator<<=(size_t __position) _GLIBCXX_NOEXCEPT
{
if (__builtin_expect(__position < _Nb, 1))
{
this->_M_do_left_shift(__position);
this->_M_do_sanitize();
}
else
this->_M_do_reset();
return *this;
}
_GLIBCXX23_CONSTEXPR
bitset<_Nb>&
operator>>=(size_t __position) _GLIBCXX_NOEXCEPT
{
if (__builtin_expect(__position < _Nb, 1))
this->_M_do_right_shift(__position);
else
this->_M_do_reset();
return *this;
}
///@}
///@{
/**
* These versions of single-bit set, reset, flip, and test are
* extensions from the SGI version. They do no range checking.
* @ingroup SGIextensions
*/
_GLIBCXX23_CONSTEXPR
bitset<_Nb>&
_Unchecked_set(size_t __pos) _GLIBCXX_NOEXCEPT
{
this->_M_getword(__pos) |= _Base::_S_maskbit(__pos);
return *this;
}
_GLIBCXX23_CONSTEXPR
bitset<_Nb>&
_Unchecked_set(size_t __pos, int __val) _GLIBCXX_NOEXCEPT
{
if (__val)
this->_M_getword(__pos) |= _Base::_S_maskbit(__pos);
else
this->_M_getword(__pos) &= ~_Base::_S_maskbit(__pos);
return *this;
}
_GLIBCXX23_CONSTEXPR
bitset<_Nb>&
_Unchecked_reset(size_t __pos) _GLIBCXX_NOEXCEPT
{
this->_M_getword(__pos) &= ~_Base::_S_maskbit(__pos);
return *this;
}
_GLIBCXX23_CONSTEXPR
bitset<_Nb>&
_Unchecked_flip(size_t __pos) _GLIBCXX_NOEXCEPT
{
this->_M_getword(__pos) ^= _Base::_S_maskbit(__pos);
return *this;
}
_GLIBCXX_CONSTEXPR bool
_Unchecked_test(size_t __pos) const _GLIBCXX_NOEXCEPT
{ return ((this->_M_getword(__pos) & _Base::_S_maskbit(__pos))
!= static_cast<_WordT>(0)); }
///@}
// Set, reset, and flip.
/**
* @brief Sets every bit to true.
*/
_GLIBCXX23_CONSTEXPR
bitset<_Nb>&
set() _GLIBCXX_NOEXCEPT
{
this->_M_do_set();
this->_M_do_sanitize();
return *this;
}
/**
* @brief Sets a given bit to a particular value.
* @param __position The index of the bit.
* @param __val Either true or false, defaults to true.
* @throw std::out_of_range If @a pos is bigger the size of the %set.
*/
_GLIBCXX23_CONSTEXPR
bitset<_Nb>&
set(size_t __position, bool __val = true)
{
this->_M_check(__position, __N("bitset::set"));
return _Unchecked_set(__position, __val);
}
/**
* @brief Sets every bit to false.
*/
_GLIBCXX23_CONSTEXPR
bitset<_Nb>&
reset() _GLIBCXX_NOEXCEPT
{
this->_M_do_reset();
return *this;
}
/**
* @brief Sets a given bit to false.
* @param __position The index of the bit.
* @throw std::out_of_range If @a pos is bigger the size of the %set.
*
* Same as writing @c set(pos,false).
*/
_GLIBCXX23_CONSTEXPR
bitset<_Nb>&
reset(size_t __position)
{
this->_M_check(__position, __N("bitset::reset"));
return _Unchecked_reset(__position);
}
/**
* @brief Toggles every bit to its opposite value.
*/
_GLIBCXX23_CONSTEXPR
bitset<_Nb>&
flip() _GLIBCXX_NOEXCEPT
{
this->_M_do_flip();
this->_M_do_sanitize();
return *this;
}
/**
* @brief Toggles a given bit to its opposite value.
* @param __position The index of the bit.
* @throw std::out_of_range If @a pos is bigger the size of the %set.
*/
_GLIBCXX23_CONSTEXPR
bitset<_Nb>&
flip(size_t __position)
{
this->_M_check(__position, __N("bitset::flip"));
return _Unchecked_flip(__position);
}
/// See the no-argument flip().
_GLIBCXX23_CONSTEXPR
bitset<_Nb>
operator~() const _GLIBCXX_NOEXCEPT
{ return bitset<_Nb>(*this).flip(); }
///@{
/**
* @brief Array-indexing support.
* @param __position Index into the %bitset.
* @return A bool for a <em>const %bitset</em>. For non-const
* bitsets, an instance of the reference proxy class.
* @note These operators do no range checking and throw no exceptions,
* as required by DR 11 to the standard.
*
* _GLIBCXX_RESOLVE_LIB_DEFECTS Note that this implementation already
* resolves DR 11 (items 1 and 2), but does not do the range-checking
* required by that DR's resolution. -pme
* The DR has since been changed: range-checking is a precondition
* (users' responsibility), and these functions must not throw. -pme
*/
_GLIBCXX23_CONSTEXPR
reference
operator[](size_t __position)
{ return reference(*this, __position); }
_GLIBCXX_CONSTEXPR bool
operator[](size_t __position) const
{ return _Unchecked_test(__position); }
///@}
/**
* @brief Returns a numerical interpretation of the %bitset.
* @return The integral equivalent of the bits.
* @throw std::overflow_error If there are too many bits to be
* represented in an @c unsigned @c long.
*/
_GLIBCXX23_CONSTEXPR
unsigned long
to_ulong() const
{ return this->_M_do_to_ulong(); }
#if __cplusplus >= 201103L
_GLIBCXX23_CONSTEXPR
unsigned long long
to_ullong() const
{ return this->_M_do_to_ullong(); }
#endif
#if _GLIBCXX_HOSTED
/**
* @brief Returns a character interpretation of the %bitset.
* @return The string equivalent of the bits.
*
* Note the ordering of the bits: decreasing character positions
* correspond to increasing bit positions (see the main class notes for
* an example).
*/
template<class _CharT, class _Traits, class _Alloc>
_GLIBCXX23_CONSTEXPR
std::basic_string<_CharT, _Traits, _Alloc>
to_string() const
{
std::basic_string<_CharT, _Traits, _Alloc> __result;
_M_copy_to_string(__result, _CharT('0'), _CharT('1'));
return __result;
}
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 396. what are characters zero and one.
template<class _CharT, class _Traits, class _Alloc>
_GLIBCXX23_CONSTEXPR
std::basic_string<_CharT, _Traits, _Alloc>
to_string(_CharT __zero, _CharT __one = _CharT('1')) const
{
std::basic_string<_CharT, _Traits, _Alloc> __result;
_M_copy_to_string(__result, __zero, __one);
return __result;
}
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 434. bitset::to_string() hard to use.
template<class _CharT, class _Traits>
_GLIBCXX23_CONSTEXPR
std::basic_string<_CharT, _Traits, std::allocator<_CharT> >
to_string() const
{ return to_string<_CharT, _Traits, std::allocator<_CharT> >(); }
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 853. to_string needs updating with zero and one.
template<class _CharT, class _Traits>
_GLIBCXX23_CONSTEXPR
std::basic_string<_CharT, _Traits, std::allocator<_CharT> >
to_string(_CharT __zero, _CharT __one = _CharT('1')) const
{ return to_string<_CharT, _Traits,
std::allocator<_CharT> >(__zero, __one); }
template<class _CharT>
_GLIBCXX23_CONSTEXPR
std::basic_string<_CharT, std::char_traits<_CharT>,
std::allocator<_CharT> >
to_string() const
{
return to_string<_CharT, std::char_traits<_CharT>,
std::allocator<_CharT> >();
}
template<class _CharT>
_GLIBCXX23_CONSTEXPR
std::basic_string<_CharT, std::char_traits<_CharT>,
std::allocator<_CharT> >
to_string(_CharT __zero, _CharT __one = _CharT('1')) const
{
return to_string<_CharT, std::char_traits<_CharT>,
std::allocator<_CharT> >(__zero, __one);
}
_GLIBCXX23_CONSTEXPR
std::basic_string<char, std::char_traits<char>, std::allocator<char> >
to_string() const
{
return to_string<char, std::char_traits<char>,
std::allocator<char> >();
}
_GLIBCXX23_CONSTEXPR
std::basic_string<char, std::char_traits<char>, std::allocator<char> >
to_string(char __zero, char __one = '1') const
{
return to_string<char, std::char_traits<char>,
std::allocator<char> >(__zero, __one);
}
#endif // HOSTED
/// Returns the number of bits which are set.
_GLIBCXX23_CONSTEXPR
size_t
count() const _GLIBCXX_NOEXCEPT
{ return this->_M_do_count(); }
/// Returns the total number of bits.
_GLIBCXX_CONSTEXPR size_t
size() const _GLIBCXX_NOEXCEPT
{ return _Nb; }
///@{
/// These comparisons for equality/inequality are, well, @e bitwise.
_GLIBCXX23_CONSTEXPR
bool
operator==(const bitset<_Nb>& __rhs) const _GLIBCXX_NOEXCEPT
{ return this->_M_is_equal(__rhs); }
#if __cpp_impl_three_way_comparison < 201907L
_GLIBCXX23_CONSTEXPR
bool
operator!=(const bitset<_Nb>& __rhs) const _GLIBCXX_NOEXCEPT
{ return !this->_M_is_equal(__rhs); }
#endif
///@}
/**
* @brief Tests the value of a bit.
* @param __position The index of a bit.
* @return The value at @a pos.
* @throw std::out_of_range If @a pos is bigger the size of the %set.
*/
_GLIBCXX23_CONSTEXPR
bool
test(size_t __position) const
{
this->_M_check(__position, __N("bitset::test"));
return _Unchecked_test(__position);
}
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// DR 693. std::bitset::all() missing.
/**
* @brief Tests whether all the bits are on.
* @return True if all the bits are set.
*/
_GLIBCXX23_CONSTEXPR
bool
all() const _GLIBCXX_NOEXCEPT
{ return this->template _M_are_all<_Nb>(); }
/**
* @brief Tests whether any of the bits are on.
* @return True if at least one bit is set.
*/
_GLIBCXX23_CONSTEXPR
bool
any() const _GLIBCXX_NOEXCEPT
{ return this->_M_is_any(); }
/**
* @brief Tests whether any of the bits are on.
* @return True if none of the bits are set.
*/
_GLIBCXX23_CONSTEXPR
bool
none() const _GLIBCXX_NOEXCEPT
{ return !this->_M_is_any(); }
///@{
/// Self-explanatory.
_GLIBCXX23_CONSTEXPR
bitset<_Nb>
operator<<(size_t __position) const _GLIBCXX_NOEXCEPT
{ return bitset<_Nb>(*this) <<= __position; }
_GLIBCXX23_CONSTEXPR
bitset<_Nb>
operator>>(size_t __position) const _GLIBCXX_NOEXCEPT
{ return bitset<_Nb>(*this) >>= __position; }
///@}
/**
* @brief Finds the index of the first "on" bit.
* @return The index of the first bit set, or size() if not found.
* @ingroup SGIextensions
* @sa _Find_next
*/
_GLIBCXX23_CONSTEXPR
size_t
_Find_first() const _GLIBCXX_NOEXCEPT
{ return this->_M_do_find_first(_Nb); }
/**
* @brief Finds the index of the next "on" bit after prev.
* @return The index of the next bit set, or size() if not found.
* @param __prev Where to start searching.
* @ingroup SGIextensions
* @sa _Find_first
*/
_GLIBCXX23_CONSTEXPR
size_t
_Find_next(size_t __prev) const _GLIBCXX_NOEXCEPT
{ return this->_M_do_find_next(__prev, _Nb); }
private:
// Helper functions for string operations.
template<class _CharT, class _Traits>
_GLIBCXX23_CONSTEXPR
void
_M_copy_from_ptr(const _CharT*, size_t, size_t, size_t,
_CharT, _CharT);
#if _GLIBCXX_HOSTED
template<class _CharT, class _Traits, class _Alloc>
_GLIBCXX23_CONSTEXPR
void
_M_copy_from_string(const std::basic_string<_CharT,
_Traits, _Alloc>& __s, size_t __pos, size_t __n,
_CharT __zero, _CharT __one)
{ _M_copy_from_ptr<_CharT, _Traits>(__s.data(), __s.size(), __pos, __n,
__zero, __one); }
template<class _CharT, class _Traits, class _Alloc>
_GLIBCXX23_CONSTEXPR
void
_M_copy_to_string(std::basic_string<_CharT, _Traits, _Alloc>&,
_CharT, _CharT) const;
template<class _CharT, class _Traits, size_t _Nb2>
friend std::basic_istream<_CharT, _Traits>&
operator>>(std::basic_istream<_CharT, _Traits>&, bitset<_Nb2>&);
template <class _CharT, class _Traits, size_t _Nb2>
friend std::basic_ostream<_CharT, _Traits>&
operator<<(std::basic_ostream<_CharT, _Traits>&, const bitset<_Nb2>&);
#endif
};
// Definitions of non-inline member functions.
template<size_t _Nb>
template<class _CharT, class _Traits>
_GLIBCXX23_CONSTEXPR
void
bitset<_Nb>::
_M_copy_from_ptr(const _CharT* __s, size_t __len,
size_t __pos, size_t __n, _CharT __zero, _CharT __one)
{
reset();
const size_t __nbits = std::min(_Nb, std::min(__n, size_t(__len - __pos)));
for (size_t __i = __nbits; __i > 0; --__i)
{
const _CharT __c = __s[__pos + __nbits - __i];
if (_Traits::eq(__c, __zero))
;
else if (_Traits::eq(__c, __one))
_Unchecked_set(__i - 1);
else
__throw_invalid_argument(__N("bitset::_M_copy_from_ptr"));
}
}
#if _GLIBCXX_HOSTED
template<size_t _Nb>
template<class _CharT, class _Traits, class _Alloc>
_GLIBCXX23_CONSTEXPR
void
bitset<_Nb>::
_M_copy_to_string(std::basic_string<_CharT, _Traits, _Alloc>& __s,
_CharT __zero, _CharT __one) const
{
__s.assign(_Nb, __zero);
size_t __n = this->_Find_first();
while (__n < _Nb)
{
__s[_Nb - __n - 1] = __one;
__n = _Find_next(__n);
}
}
#endif // HOSTED
// 23.3.5.3 bitset operations:
///@{
/**
* @brief Global bitwise operations on bitsets.
* @param __x A bitset.
* @param __y A bitset of the same size as @a __x.
* @return A new bitset.
*
* These should be self-explanatory.
*/
template<size_t _Nb>
_GLIBCXX23_CONSTEXPR
inline bitset<_Nb>
operator&(const bitset<_Nb>& __x, const bitset<_Nb>& __y) _GLIBCXX_NOEXCEPT
{
bitset<_Nb> __result(__x);
__result &= __y;
return __result;
}
template<size_t _Nb>
_GLIBCXX23_CONSTEXPR
inline bitset<_Nb>
operator|(const bitset<_Nb>& __x, const bitset<_Nb>& __y) _GLIBCXX_NOEXCEPT
{
bitset<_Nb> __result(__x);
__result |= __y;
return __result;
}
template <size_t _Nb>
_GLIBCXX23_CONSTEXPR
inline bitset<_Nb>
operator^(const bitset<_Nb>& __x, const bitset<_Nb>& __y) _GLIBCXX_NOEXCEPT
{
bitset<_Nb> __result(__x);
__result ^= __y;
return __result;
}
///@}
#if _GLIBCXX_HOSTED
///@{
/**
* @brief Global I/O operators for bitsets.
*
* Direct I/O between streams and bitsets is supported. Output is
* straightforward. Input will skip whitespace, only accept @a 0 and @a 1
* characters, and will only extract as many digits as the %bitset will
* hold.
*/
template<class _CharT, class _Traits, size_t _Nb>
std::basic_istream<_CharT, _Traits>&
operator>>(std::basic_istream<_CharT, _Traits>& __is, bitset<_Nb>& __x)
{
typedef typename _Traits::char_type char_type;
typedef std::basic_istream<_CharT, _Traits> __istream_type;
typedef typename __istream_type::ios_base __ios_base;
struct _Buffer
{
static _GLIBCXX_CONSTEXPR bool _S_use_alloca() { return _Nb <= 256; }
explicit _Buffer(_CharT* __p) : _M_ptr(__p) { }
~_Buffer()
{
if _GLIBCXX17_CONSTEXPR (!_S_use_alloca())
delete[] _M_ptr;
}
_CharT* const _M_ptr;
};
_CharT* __ptr;
if _GLIBCXX17_CONSTEXPR (_Buffer::_S_use_alloca())
__ptr = (_CharT*)__builtin_alloca(_Nb);
else
__ptr = new _CharT[_Nb];
const _Buffer __buf(__ptr);
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 303. Bitset input operator underspecified
const char_type __zero = __is.widen('0');
const char_type __one = __is.widen('1');
typename __ios_base::iostate __state = __ios_base::goodbit;
typename __istream_type::sentry __sentry(__is);
if (__sentry)
{
__try
{
for (size_t __i = _Nb; __i > 0; --__i)
{
static typename _Traits::int_type __eof = _Traits::eof();
typename _Traits::int_type __c1 = __is.rdbuf()->sbumpc();
if (_Traits::eq_int_type(__c1, __eof))
{
__state |= __ios_base::eofbit;
break;
}
else
{
const char_type __c2 = _Traits::to_char_type(__c1);
if (_Traits::eq(__c2, __zero))
*__ptr++ = __zero;
else if (_Traits::eq(__c2, __one))
*__ptr++ = __one;
else if (_Traits::
eq_int_type(__is.rdbuf()->sputbackc(__c2),
__eof))
{
__state |= __ios_base::failbit;
break;
}
}
}
}
__catch(__cxxabiv1::__forced_unwind&)
{
__is._M_setstate(__ios_base::badbit);
__throw_exception_again;
}
__catch(...)
{ __is._M_setstate(__ios_base::badbit); }
}
if _GLIBCXX17_CONSTEXPR (_Nb)
{
if (size_t __len = __ptr - __buf._M_ptr)
__x.template _M_copy_from_ptr<_CharT, _Traits>(__buf._M_ptr, __len,
0, __len,
__zero, __one);
else
__state |= __ios_base::failbit;
}
if (__state)
__is.setstate(__state);
return __is;
}
template <class _CharT, class _Traits, size_t _Nb>
std::basic_ostream<_CharT, _Traits>&
operator<<(std::basic_ostream<_CharT, _Traits>& __os,
const bitset<_Nb>& __x)
{
std::basic_string<_CharT, _Traits> __tmp;
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 396. what are characters zero and one.
const ctype<_CharT>& __ct = use_facet<ctype<_CharT> >(__os.getloc());
__x._M_copy_to_string(__tmp, __ct.widen('0'), __ct.widen('1'));
return __os << __tmp;
}
///@}
#endif // HOSTED
_GLIBCXX_END_NAMESPACE_CONTAINER
} // namespace std
#undef _GLIBCXX_BITSET_WORDS
#undef _GLIBCXX_BITSET_BITS_PER_WORD
#undef _GLIBCXX_BITSET_BITS_PER_ULL
#if __cplusplus >= 201103L
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
// DR 1182.
/// std::hash specialization for bitset.
template<size_t _Nb>
struct hash<_GLIBCXX_STD_C::bitset<_Nb>>
: public __hash_base<size_t, _GLIBCXX_STD_C::bitset<_Nb>>
{
size_t
operator()(const _GLIBCXX_STD_C::bitset<_Nb>& __b) const noexcept
{
const size_t __clength = (_Nb + __CHAR_BIT__ - 1) / __CHAR_BIT__;
return std::_Hash_impl::hash(__b._M_getdata(), __clength);
}
};
template<>
struct hash<_GLIBCXX_STD_C::bitset<0>>
: public __hash_base<size_t, _GLIBCXX_STD_C::bitset<0>>
{
size_t
operator()(const _GLIBCXX_STD_C::bitset<0>&) const noexcept
{ return 0; }
};
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace
#endif // C++11
#if defined _GLIBCXX_DEBUG && _GLIBCXX_HOSTED
# include <debug/bitset>
#endif
#endif /* _GLIBCXX_BITSET */
iosfwd
string
functional_hash.h
functexcept.h
stl_algobase.h
version.h
cxxabi_forced.h
std::bitset::_Unchecked_reset
constexpr bitset< _Nb > & _Unchecked_reset(size_t __pos) noexcept
Definition bitset:1136
std::bitset::_Unchecked_flip
constexpr bitset< _Nb > & _Unchecked_flip(size_t __pos) noexcept
Definition bitset:1144
std::bitset::_Find_first
constexpr size_t _Find_first() const noexcept
Finds the index of the first "on" bit.
Definition bitset:1458
std::bitset::_Unchecked_test
constexpr bool _Unchecked_test(size_t __pos) const noexcept
Definition bitset:1151
std::bitset::_Unchecked_set
constexpr bitset< _Nb > & _Unchecked_set(size_t __pos) noexcept
Definition bitset:1117
std::bitset::_Unchecked_set
constexpr bitset< _Nb > & _Unchecked_set(size_t __pos, int __val) noexcept
Definition bitset:1125
std::bitset::_Find_next
constexpr size_t _Find_next(size_t __prev) const noexcept
Finds the index of the next "on" bit after prev.
Definition bitset:1470
std::min
constexpr const _Tp & min(const _Tp &, const _Tp &)
This does what you think it does.
Definition stl_algobase.h:234
std::use_facet
const _Facet & use_facet(const locale &__loc)
Return a facet.
Definition locale_classes.tcc:220
std
ISO C++ entities toplevel namespace is std.
std::operator^
constexpr bitset< _Nb > operator^(const bitset< _Nb > &__x, const bitset< _Nb > &__y) noexcept
Global bitwise operations on bitsets.
Definition bitset:1582
std::operator>>
std::basic_istream< _CharT, _Traits > & operator>>(std::basic_istream< _CharT, _Traits > &__is, bitset< _Nb > &__x)
Global I/O operators for bitsets.
Definition bitset:1602
std::operator<<
std::basic_ostream< _CharT, _Traits > & operator<<(std::basic_ostream< _CharT, _Traits > &__os, const bitset< _Nb > &__x)
Global I/O operators for bitsets.
Definition bitset:1692
std::operator|
constexpr bitset< _Nb > operator|(const bitset< _Nb > &__x, const bitset< _Nb > &__y) noexcept
Global bitwise operations on bitsets.
Definition bitset:1572
std::operator&
constexpr bitset< _Nb > operator&(const bitset< _Nb > &__x, const bitset< _Nb > &__y) noexcept
Global bitwise operations on bitsets.
Definition bitset:1562
std::_Base_bitset
Definition bitset:85
std::_Base_bitset<((_Nb)/(__CHAR_BIT__ *__SIZEOF_LONG__)+((_Nb) %(__CHAR_BIT__ *__SIZEOF_LONG__)==0 ? 0 :1))>::_M_w
_WordT _M_w[_Nw]
Definition bitset:89
std::bitset
The bitset class represents a fixed-size sequence of bits.
Definition bitset:814
std::bitset::operator[]
constexpr reference operator[](size_t __position)
Array-indexing support.
Definition bitset:1257
std::bitset::operator>>=
constexpr bitset< _Nb > & operator>>=(size_t __position) noexcept
Definition bitset:1099
std::bitset::flip
constexpr bitset< _Nb > & flip() noexcept
Toggles every bit to its opposite value.
Definition bitset:1214
std::bitset::operator&=
constexpr bitset< _Nb > & operator&=(const bitset< _Nb > &__rhs) noexcept
Definition bitset:1053
std::bitset::operator>>
constexpr bitset< _Nb > operator>>(size_t __position) const noexcept
Self-explanatory.
Definition bitset:1446
std::bitset::to_ulong
constexpr unsigned long to_ulong() const
Returns a numerical interpretation of the bitset.
Definition bitset:1273
std::bitset::any
constexpr bool any() const noexcept
Tests whether any of the bits are on.
Definition bitset:1425
std::bitset::bitset
constexpr bitset() noexcept
All bits set to zero.
Definition bitset:941
std::bitset::operator^=
constexpr bitset< _Nb > & operator^=(const bitset< _Nb > &__rhs) noexcept
Definition bitset:1069
std::bitset::test
constexpr bool test(size_t __position) const
Tests the value of a bit.
Definition bitset:1402
std::bitset::operator~
constexpr bitset< _Nb > operator~() const noexcept
See the no-argument flip().
Definition bitset:1237
std::bitset::operator|=
constexpr bitset< _Nb > & operator|=(const bitset< _Nb > &__rhs) noexcept
Definition bitset:1061
std::bitset::set
constexpr bitset< _Nb > & set(size_t __position, bool __val=true)
Sets a given bit to a particular value.
Definition bitset:1177
std::bitset::count
constexpr size_t count() const noexcept
Returns the number of bits which are set.
Definition bitset:1371
std::bitset::operator<<=
constexpr bitset< _Nb > & operator<<=(size_t __position) noexcept
Definition bitset:1085
std::bitset::to_string
constexpr std::basic_string< _CharT, _Traits, _Alloc > to_string() const
Returns a character interpretation of the bitset.
Definition bitset:1295
std::bitset::bitset
constexpr bitset(const _CharT *__str, typename __bitset::__string< _CharT >::size_type __n=__bitset::__string< _CharT >::npos, _CharT __zero=_CharT('0'), _CharT __one=_CharT('1'))
Definition bitset:1025
std::bitset::reset
constexpr bitset< _Nb > & reset() noexcept
Sets every bit to false.
Definition bitset:1188
std::bitset::set
constexpr bitset< _Nb > & set() noexcept
Sets every bit to true.
Definition bitset:1162
std::bitset::bitset
constexpr bitset(const std::basic_string< _CharT, _Traits, _Alloc > &__s, size_t __position=0)
Definition bitset:967
std::bitset::bitset
constexpr bitset(const std::basic_string< _CharT, _Traits, _Alloc > &__s, size_t __position, size_t __n)
Definition bitset:989
std::bitset::bitset
constexpr bitset(unsigned long long __val) noexcept
Initial bits bitwise-copied from a single word (others set to zero).
Definition bitset:946
std::bitset::size
constexpr size_t size() const noexcept
Returns the total number of bits.
Definition bitset:1376
std::bitset::all
constexpr bool all() const noexcept
Tests whether all the bits are on.
Definition bitset:1416
std::bitset::reset
constexpr bitset< _Nb > & reset(size_t __position)
Sets a given bit to false.
Definition bitset:1203
std::bitset::none
constexpr bool none() const noexcept
Tests whether any of the bits are on.
Definition bitset:1434
std::bitset::operator==
constexpr bool operator==(const bitset< _Nb > &__rhs) const noexcept
These comparisons for equality/inequality are, well, bitwise.
Definition bitset:1383
std::bitset::operator[]
constexpr bool operator[](size_t __position) const
Array-indexing support.
Definition bitset:1261
std::bitset::flip
constexpr bitset< _Nb > & flip(size_t __position)
Toggles a given bit to its opposite value.
Definition bitset:1228
std::bitset::reference
Definition bitset:869
std::basic_ios::setstate
void setstate(iostate __state)
Sets additional flags in the error state.
Definition basic_ios.h:166
std::basic_ios::widen
char_type widen(char __c) const
Widens characters.
Definition basic_ios.h:464
std::basic_ios::rdbuf
basic_streambuf< _CharT, _Traits > * rdbuf() const
Accessing the underlying buffer.
Definition basic_ios.h:337
std::basic_istream
Template class basic_istream.
Definition istream:63
std::basic_ostream
Template class basic_ostream.
Definition ostream.h:67
std::hash
Primary class template hash.
Definition functional_hash.h:106
std::size_type
std::basic_string
Managing sequences of characters and character-like objects.
Definition basic_string.h:95
std::basic_string::size
constexpr size_type size() const noexcept
Returns the number of characters in the string, not including any null-termination.
Definition basic_string.h:1163
std::basic_string::data
constexpr const _CharT * data() const noexcept
Return const pointer to contents.
Definition basic_string.h:2886
std::basic_string::assign
constexpr basic_string & assign(const basic_string &__str)
Set value to contents of another string.
Definition basic_string.h:1740
std::basic_string::npos
static const size_type npos
Value returned by various member functions when they fail.
Definition basic_string.h:128
__cxxabiv1::__forced_unwind
Thrown as part of forced unwinding.
Definition cxxabi_forced.h:51
std::ios_base::getloc
locale getloc() const
Locale access.
Definition ios_base.h:841
bitset