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__bit_reference
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// -*- 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_REFERENCE
#define _LIBCPP___BIT_REFERENCE
#include <__algorithm/copy_n.h>
#include <__algorithm/min.h>
#include <__bit/countr.h>
#include <__compare/ordering.h>
#include <__config>
#include <__cstddef/size_t.h>
#include <__fwd/bit_reference.h>
#include <__iterator/iterator_traits.h>
#include <__memory/construct_at.h>
#include <__memory/pointer_traits.h>
#include <__type_traits/conditional.h>
#include <__type_traits/is_constant_evaluated.h>
#include <__utility/swap.h>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_PUSH_MACROS
#include <__undef_macros>
_LIBCPP_BEGIN_NAMESPACE_STD
template <class _Cp>
class __bit_const_reference;
template <class _Tp>
struct __has_storage_type {
static const bool value = false;
};
template <class _Cp, bool = __has_storage_type<_Cp>::value>
class __bit_reference {
using __storage_type = typename _Cp::__storage_type;
using __storage_pointer = typename _Cp::__storage_pointer;
__storage_pointer __seg_;
__storage_type __mask_;
friend typename _Cp::__self;
friend class __bit_const_reference<_Cp>;
friend class __bit_iterator<_Cp, false>;
public:
using __container = typename _Cp::__self;
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __bit_reference(const __bit_reference&) = default;
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 operator bool() const _NOEXCEPT {
return static_cast<bool>(*__seg_ & __mask_);
}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool operator~() const _NOEXCEPT {
return !static_cast<bool>(*this);
}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __bit_reference& operator=(bool __x) _NOEXCEPT {
if (__x)
*__seg_ |= __mask_;
else
*__seg_ &= ~__mask_;
return *this;
}
#if _LIBCPP_STD_VER >= 23
_LIBCPP_HIDE_FROM_ABI constexpr const __bit_reference& operator=(bool __x) const noexcept {
if (__x)
*__seg_ |= __mask_;
else
*__seg_ &= ~__mask_;
return *this;
}
#endif
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __bit_reference& operator=(const __bit_reference& __x) _NOEXCEPT {
return operator=(static_cast<bool>(__x));
}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void flip() _NOEXCEPT { *__seg_ ^= __mask_; }
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __bit_iterator<_Cp, false> operator&() const _NOEXCEPT {
return __bit_iterator<_Cp, false>(__seg_, static_cast<unsigned>(std::__libcpp_ctz(__mask_)));
}
private:
_LIBCPP_HIDE_FROM_ABI
_LIBCPP_CONSTEXPR_SINCE_CXX20 explicit __bit_reference(__storage_pointer __s, __storage_type __m) _NOEXCEPT
: __seg_(__s),
__mask_(__m) {}
};
template <class _Cp>
class __bit_reference<_Cp, false> {};
template <class _Cp>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void
swap(__bit_reference<_Cp> __x, __bit_reference<_Cp> __y) _NOEXCEPT {
bool __t = __x;
__x = __y;
__y = __t;
}
template <class _Cp, class _Dp>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void
swap(__bit_reference<_Cp> __x, __bit_reference<_Dp> __y) _NOEXCEPT {
bool __t = __x;
__x = __y;
__y = __t;
}
template <class _Cp>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void swap(__bit_reference<_Cp> __x, bool& __y) _NOEXCEPT {
bool __t = __x;
__x = __y;
__y = __t;
}
template <class _Cp>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void swap(bool& __x, __bit_reference<_Cp> __y) _NOEXCEPT {
bool __t = __x;
__x = __y;
__y = __t;
}
template <class _Cp>
class __bit_const_reference {
using __storage_type = typename _Cp::__storage_type;
using __storage_pointer = typename _Cp::__const_storage_pointer;
__storage_pointer __seg_;
__storage_type __mask_;
friend typename _Cp::__self;
friend class __bit_iterator<_Cp, true>;
public:
using __container = typename _Cp::__self;
_LIBCPP_HIDE_FROM_ABI __bit_const_reference(const __bit_const_reference&) = default;
__bit_const_reference& operator=(const __bit_const_reference&) = delete;
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __bit_const_reference(const __bit_reference<_Cp>& __x) _NOEXCEPT
: __seg_(__x.__seg_),
__mask_(__x.__mask_) {}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR operator bool() const _NOEXCEPT {
return static_cast<bool>(*__seg_ & __mask_);
}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __bit_iterator<_Cp, true> operator&() const _NOEXCEPT {
return __bit_iterator<_Cp, true>(__seg_, static_cast<unsigned>(std::__libcpp_ctz(__mask_)));
}
private:
_LIBCPP_HIDE_FROM_ABI
_LIBCPP_CONSTEXPR explicit __bit_const_reference(__storage_pointer __s, __storage_type __m) _NOEXCEPT
: __seg_(__s),
__mask_(__m) {}
};
// copy
template <class _Cp, bool _IsConst>
_LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI __bit_iterator<_Cp, false> __copy_aligned(
__bit_iterator<_Cp, _IsConst> __first, __bit_iterator<_Cp, _IsConst> __last, __bit_iterator<_Cp, false> __result) {
using _In = __bit_iterator<_Cp, _IsConst>;
using difference_type = typename _In::difference_type;
using __storage_type = typename _In::__storage_type;
const int __bits_per_word = _In::__bits_per_word;
difference_type __n = __last - __first;
if (__n > 0) {
// do first word
if (__first.__ctz_ != 0) {
unsigned __clz = __bits_per_word - __first.__ctz_;
difference_type __dn = std::min(static_cast<difference_type>(__clz), __n);
__n -= __dn;
__storage_type __m = (~__storage_type(0) << __first.__ctz_) & (~__storage_type(0) >> (__clz - __dn));
__storage_type __b = *__first.__seg_ & __m;
*__result.__seg_ &= ~__m;
*__result.__seg_ |= __b;
__result.__seg_ += (__dn + __result.__ctz_) / __bits_per_word;
__result.__ctz_ = static_cast<unsigned>((__dn + __result.__ctz_) % __bits_per_word);
++__first.__seg_;
// __first.__ctz_ = 0;
}
// __first.__ctz_ == 0;
// do middle words
__storage_type __nw = __n / __bits_per_word;
std::copy_n(std::__to_address(__first.__seg_), __nw, std::__to_address(__result.__seg_));
__n -= __nw * __bits_per_word;
__result.__seg_ += __nw;
// do last word
if (__n > 0) {
__first.__seg_ += __nw;
__storage_type __m = ~__storage_type(0) >> (__bits_per_word - __n);
__storage_type __b = *__first.__seg_ & __m;
*__result.__seg_ &= ~__m;
*__result.__seg_ |= __b;
__result.__ctz_ = static_cast<unsigned>(__n);
}
}
return __result;
}
template <class _Cp, bool _IsConst>
_LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI __bit_iterator<_Cp, false> __copy_unaligned(
__bit_iterator<_Cp, _IsConst> __first, __bit_iterator<_Cp, _IsConst> __last, __bit_iterator<_Cp, false> __result) {
using _In = __bit_iterator<_Cp, _IsConst>;
using difference_type = typename _In::difference_type;
using __storage_type = typename _In::__storage_type;
const int __bits_per_word = _In::__bits_per_word;
difference_type __n = __last - __first;
if (__n > 0) {
// do first word
if (__first.__ctz_ != 0) {
unsigned __clz_f = __bits_per_word - __first.__ctz_;
difference_type __dn = std::min(static_cast<difference_type>(__clz_f), __n);
__n -= __dn;
__storage_type __m = (~__storage_type(0) << __first.__ctz_) & (~__storage_type(0) >> (__clz_f - __dn));
__storage_type __b = *__first.__seg_ & __m;
unsigned __clz_r = __bits_per_word - __result.__ctz_;
__storage_type __ddn = std::min<__storage_type>(__dn, __clz_r);
__m = (~__storage_type(0) << __result.__ctz_) & (~__storage_type(0) >> (__clz_r - __ddn));
*__result.__seg_ &= ~__m;
if (__result.__ctz_ > __first.__ctz_)
*__result.__seg_ |= __b << (__result.__ctz_ - __first.__ctz_);
else
*__result.__seg_ |= __b >> (__first.__ctz_ - __result.__ctz_);
__result.__seg_ += (__ddn + __result.__ctz_) / __bits_per_word;
__result.__ctz_ = static_cast<unsigned>((__ddn + __result.__ctz_) % __bits_per_word);
__dn -= __ddn;
if (__dn > 0) {
__m = ~__storage_type(0) >> (__bits_per_word - __dn);
*__result.__seg_ &= ~__m;
*__result.__seg_ |= __b >> (__first.__ctz_ + __ddn);
__result.__ctz_ = static_cast<unsigned>(__dn);
}
++__first.__seg_;
// __first.__ctz_ = 0;
}
// __first.__ctz_ == 0;
// do middle words
unsigned __clz_r = __bits_per_word - __result.__ctz_;
__storage_type __m = ~__storage_type(0) << __result.__ctz_;
for (; __n >= __bits_per_word; __n -= __bits_per_word, ++__first.__seg_) {
__storage_type __b = *__first.__seg_;
*__result.__seg_ &= ~__m;
*__result.__seg_ |= __b << __result.__ctz_;
++__result.__seg_;
*__result.__seg_ &= __m;
*__result.__seg_ |= __b >> __clz_r;
}
// do last word
if (__n > 0) {
__m = ~__storage_type(0) >> (__bits_per_word - __n);
__storage_type __b = *__first.__seg_ & __m;
__storage_type __dn = std::min(__n, static_cast<difference_type>(__clz_r));
__m = (~__storage_type(0) << __result.__ctz_) & (~__storage_type(0) >> (__clz_r - __dn));
*__result.__seg_ &= ~__m;
*__result.__seg_ |= __b << __result.__ctz_;
__result.__seg_ += (__dn + __result.__ctz_) / __bits_per_word;
__result.__ctz_ = static_cast<unsigned>((__dn + __result.__ctz_) % __bits_per_word);
__n -= __dn;
if (__n > 0) {
__m = ~__storage_type(0) >> (__bits_per_word - __n);
*__result.__seg_ &= ~__m;
*__result.__seg_ |= __b >> __dn;
__result.__ctz_ = static_cast<unsigned>(__n);
}
}
}
return __result;
}
template <class _Cp, bool _IsConst>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __bit_iterator<_Cp, false>
copy(__bit_iterator<_Cp, _IsConst> __first, __bit_iterator<_Cp, _IsConst> __last, __bit_iterator<_Cp, false> __result) {
if (__first.__ctz_ == __result.__ctz_)
return std::__copy_aligned(__first, __last, __result);
return std::__copy_unaligned(__first, __last, __result);
}
// copy_backward
template <class _Cp, bool _IsConst>
_LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI __bit_iterator<_Cp, false> __copy_backward_aligned(
__bit_iterator<_Cp, _IsConst> __first, __bit_iterator<_Cp, _IsConst> __last, __bit_iterator<_Cp, false> __result) {
using _In = __bit_iterator<_Cp, _IsConst>;
using difference_type = typename _In::difference_type;
using __storage_type = typename _In::__storage_type;
const int __bits_per_word = _In::__bits_per_word;
difference_type __n = __last - __first;
if (__n > 0) {
// do first word
if (__last.__ctz_ != 0) {
difference_type __dn = std::min(static_cast<difference_type>(__last.__ctz_), __n);
__n -= __dn;
unsigned __clz = __bits_per_word - __last.__ctz_;
__storage_type __m = (~__storage_type(0) << (__last.__ctz_ - __dn)) & (~__storage_type(0) >> __clz);
__storage_type __b = *__last.__seg_ & __m;
*__result.__seg_ &= ~__m;
*__result.__seg_ |= __b;
__result.__ctz_ = static_cast<unsigned>(((-__dn & (__bits_per_word - 1)) + __result.__ctz_) % __bits_per_word);
// __last.__ctz_ = 0
}
// __last.__ctz_ == 0 || __n == 0
// __result.__ctz_ == 0 || __n == 0
// do middle words
__storage_type __nw = __n / __bits_per_word;
__result.__seg_ -= __nw;
__last.__seg_ -= __nw;
std::copy_n(std::__to_address(__last.__seg_), __nw, std::__to_address(__result.__seg_));
__n -= __nw * __bits_per_word;
// do last word
if (__n > 0) {
__storage_type __m = ~__storage_type(0) << (__bits_per_word - __n);
__storage_type __b = *--__last.__seg_ & __m;
*--__result.__seg_ &= ~__m;
*__result.__seg_ |= __b;
__result.__ctz_ = static_cast<unsigned>(-__n & (__bits_per_word - 1));
}
}
return __result;
}
template <class _Cp, bool _IsConst>
_LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI __bit_iterator<_Cp, false> __copy_backward_unaligned(
__bit_iterator<_Cp, _IsConst> __first, __bit_iterator<_Cp, _IsConst> __last, __bit_iterator<_Cp, false> __result) {
using _In = __bit_iterator<_Cp, _IsConst>;
using difference_type = typename _In::difference_type;
using __storage_type = typename _In::__storage_type;
const int __bits_per_word = _In::__bits_per_word;
difference_type __n = __last - __first;
if (__n > 0) {
// do first word
if (__last.__ctz_ != 0) {
difference_type __dn = std::min(static_cast<difference_type>(__last.__ctz_), __n);
__n -= __dn;
unsigned __clz_l = __bits_per_word - __last.__ctz_;
__storage_type __m = (~__storage_type(0) << (__last.__ctz_ - __dn)) & (~__storage_type(0) >> __clz_l);
__storage_type __b = *__last.__seg_ & __m;
unsigned __clz_r = __bits_per_word - __result.__ctz_;
__storage_type __ddn = std::min(__dn, static_cast<difference_type>(__result.__ctz_));
if (__ddn > 0) {
__m = (~__storage_type(0) << (__result.__ctz_ - __ddn)) & (~__storage_type(0) >> __clz_r);
*__result.__seg_ &= ~__m;
if (__result.__ctz_ > __last.__ctz_)
*__result.__seg_ |= __b << (__result.__ctz_ - __last.__ctz_);
else
*__result.__seg_ |= __b >> (__last.__ctz_ - __result.__ctz_);
__result.__ctz_ = static_cast<unsigned>(((-__ddn & (__bits_per_word - 1)) + __result.__ctz_) % __bits_per_word);
__dn -= __ddn;
}
if (__dn > 0) {
// __result.__ctz_ == 0
--__result.__seg_;
__result.__ctz_ = static_cast<unsigned>(-__dn & (__bits_per_word - 1));
__m = ~__storage_type(0) << __result.__ctz_;
*__result.__seg_ &= ~__m;
__last.__ctz_ -= __dn + __ddn;
*__result.__seg_ |= __b << (__result.__ctz_ - __last.__ctz_);
}
// __last.__ctz_ = 0
}
// __last.__ctz_ == 0 || __n == 0
// __result.__ctz_ != 0 || __n == 0
// do middle words
unsigned __clz_r = __bits_per_word - __result.__ctz_;
__storage_type __m = ~__storage_type(0) >> __clz_r;
for (; __n >= __bits_per_word; __n -= __bits_per_word) {
__storage_type __b = *--__last.__seg_;
*__result.__seg_ &= ~__m;
*__result.__seg_ |= __b >> __clz_r;
*--__result.__seg_ &= __m;
*__result.__seg_ |= __b << __result.__ctz_;
}
// do last word
if (__n > 0) {
__m = ~__storage_type(0) << (__bits_per_word - __n);
__storage_type __b = *--__last.__seg_ & __m;
__clz_r = __bits_per_word - __result.__ctz_;
__storage_type __dn = std::min(__n, static_cast<difference_type>(__result.__ctz_));
__m = (~__storage_type(0) << (__result.__ctz_ - __dn)) & (~__storage_type(0) >> __clz_r);
*__result.__seg_ &= ~__m;
*__result.__seg_ |= __b >> (__bits_per_word - __result.__ctz_);
__result.__ctz_ = static_cast<unsigned>(((-__dn & (__bits_per_word - 1)) + __result.__ctz_) % __bits_per_word);
__n -= __dn;
if (__n > 0) {
// __result.__ctz_ == 0
--__result.__seg_;
__result.__ctz_ = static_cast<unsigned>(-__n & (__bits_per_word - 1));
__m = ~__storage_type(0) << __result.__ctz_;
*__result.__seg_ &= ~__m;
*__result.__seg_ |= __b << (__result.__ctz_ - (__bits_per_word - __n - __dn));
}
}
}
return __result;
}
template <class _Cp, bool _IsConst>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __bit_iterator<_Cp, false> copy_backward(
__bit_iterator<_Cp, _IsConst> __first, __bit_iterator<_Cp, _IsConst> __last, __bit_iterator<_Cp, false> __result) {
if (__last.__ctz_ == __result.__ctz_)
return std::__copy_backward_aligned(__first, __last, __result);
return std::__copy_backward_unaligned(__first, __last, __result);
}
// move
template <class _Cp, bool _IsConst>
inline _LIBCPP_HIDE_FROM_ABI __bit_iterator<_Cp, false>
move(__bit_iterator<_Cp, _IsConst> __first, __bit_iterator<_Cp, _IsConst> __last, __bit_iterator<_Cp, false> __result) {
return std::copy(__first, __last, __result);
}
// move_backward
template <class _Cp, bool _IsConst>
inline _LIBCPP_HIDE_FROM_ABI __bit_iterator<_Cp, false> move_backward(
__bit_iterator<_Cp, _IsConst> __first, __bit_iterator<_Cp, _IsConst> __last, __bit_iterator<_Cp, false> __result) {
return std::copy_backward(__first, __last, __result);
}
// swap_ranges
template <class _Cl, class _Cr>
_LIBCPP_HIDE_FROM_ABI __bit_iterator<_Cr, false> __swap_ranges_aligned(
__bit_iterator<_Cl, false> __first, __bit_iterator<_Cl, false> __last, __bit_iterator<_Cr, false> __result) {
using _I1 = __bit_iterator<_Cl, false>;
using difference_type = typename _I1::difference_type;
using __storage_type = typename _I1::__storage_type;
const int __bits_per_word = _I1::__bits_per_word;
difference_type __n = __last - __first;
if (__n > 0) {
// do first word
if (__first.__ctz_ != 0) {
unsigned __clz = __bits_per_word - __first.__ctz_;
difference_type __dn = std::min(static_cast<difference_type>(__clz), __n);
__n -= __dn;
__storage_type __m = (~__storage_type(0) << __first.__ctz_) & (~__storage_type(0) >> (__clz - __dn));
__storage_type __b1 = *__first.__seg_ & __m;
*__first.__seg_ &= ~__m;
__storage_type __b2 = *__result.__seg_ & __m;
*__result.__seg_ &= ~__m;
*__result.__seg_ |= __b1;
*__first.__seg_ |= __b2;
__result.__seg_ += (__dn + __result.__ctz_) / __bits_per_word;
__result.__ctz_ = static_cast<unsigned>((__dn + __result.__ctz_) % __bits_per_word);
++__first.__seg_;
// __first.__ctz_ = 0;
}
// __first.__ctz_ == 0;
// do middle words
for (; __n >= __bits_per_word; __n -= __bits_per_word, ++__first.__seg_, ++__result.__seg_)
swap(*__first.__seg_, *__result.__seg_);
// do last word
if (__n > 0) {
__storage_type __m = ~__storage_type(0) >> (__bits_per_word - __n);
__storage_type __b1 = *__first.__seg_ & __m;
*__first.__seg_ &= ~__m;
__storage_type __b2 = *__result.__seg_ & __m;
*__result.__seg_ &= ~__m;
*__result.__seg_ |= __b1;
*__first.__seg_ |= __b2;
__result.__ctz_ = static_cast<unsigned>(__n);
}
}
return __result;
}
template <class _Cl, class _Cr>
_LIBCPP_HIDE_FROM_ABI __bit_iterator<_Cr, false> __swap_ranges_unaligned(
__bit_iterator<_Cl, false> __first, __bit_iterator<_Cl, false> __last, __bit_iterator<_Cr, false> __result) {
using _I1 = __bit_iterator<_Cl, false>;
using difference_type = typename _I1::difference_type;
using __storage_type = typename _I1::__storage_type;
const int __bits_per_word = _I1::__bits_per_word;
difference_type __n = __last - __first;
if (__n > 0) {
// do first word
if (__first.__ctz_ != 0) {
unsigned __clz_f = __bits_per_word - __first.__ctz_;
difference_type __dn = std::min(static_cast<difference_type>(__clz_f), __n);
__n -= __dn;
__storage_type __m = (~__storage_type(0) << __first.__ctz_) & (~__storage_type(0) >> (__clz_f - __dn));
__storage_type __b1 = *__first.__seg_ & __m;
*__first.__seg_ &= ~__m;
unsigned __clz_r = __bits_per_word - __result.__ctz_;
__storage_type __ddn = std::min<__storage_type>(__dn, __clz_r);
__m = (~__storage_type(0) << __result.__ctz_) & (~__storage_type(0) >> (__clz_r - __ddn));
__storage_type __b2 = *__result.__seg_ & __m;
*__result.__seg_ &= ~__m;
if (__result.__ctz_ > __first.__ctz_) {
unsigned __s = __result.__ctz_ - __first.__ctz_;
*__result.__seg_ |= __b1 << __s;
*__first.__seg_ |= __b2 >> __s;
} else {
unsigned __s = __first.__ctz_ - __result.__ctz_;
*__result.__seg_ |= __b1 >> __s;
*__first.__seg_ |= __b2 << __s;
}
__result.__seg_ += (__ddn + __result.__ctz_) / __bits_per_word;
__result.__ctz_ = static_cast<unsigned>((__ddn + __result.__ctz_) % __bits_per_word);
__dn -= __ddn;
if (__dn > 0) {
__m = ~__storage_type(0) >> (__bits_per_word - __dn);
__b2 = *__result.__seg_ & __m;
*__result.__seg_ &= ~__m;
unsigned __s = __first.__ctz_ + __ddn;
*__result.__seg_ |= __b1 >> __s;
*__first.__seg_ |= __b2 << __s;
__result.__ctz_ = static_cast<unsigned>(__dn);
}
++__first.__seg_;
// __first.__ctz_ = 0;
}
// __first.__ctz_ == 0;
// do middle words
__storage_type __m = ~__storage_type(0) << __result.__ctz_;
unsigned __clz_r = __bits_per_word - __result.__ctz_;
for (; __n >= __bits_per_word; __n -= __bits_per_word, ++__first.__seg_) {
__storage_type __b1 = *__first.__seg_;
__storage_type __b2 = *__result.__seg_ & __m;
*__result.__seg_ &= ~__m;
*__result.__seg_ |= __b1 << __result.__ctz_;
*__first.__seg_ = __b2 >> __result.__ctz_;
++__result.__seg_;
__b2 = *__result.__seg_ & ~__m;
*__result.__seg_ &= __m;
*__result.__seg_ |= __b1 >> __clz_r;
*__first.__seg_ |= __b2 << __clz_r;
}
// do last word
if (__n > 0) {
__m = ~__storage_type(0) >> (__bits_per_word - __n);
__storage_type __b1 = *__first.__seg_ & __m;
*__first.__seg_ &= ~__m;
__storage_type __dn = std::min<__storage_type>(__n, __clz_r);
__m = (~__storage_type(0) << __result.__ctz_) & (~__storage_type(0) >> (__clz_r - __dn));
__storage_type __b2 = *__result.__seg_ & __m;
*__result.__seg_ &= ~__m;
*__result.__seg_ |= __b1 << __result.__ctz_;
*__first.__seg_ |= __b2 >> __result.__ctz_;
__result.__seg_ += (__dn + __result.__ctz_) / __bits_per_word;
__result.__ctz_ = static_cast<unsigned>((__dn + __result.__ctz_) % __bits_per_word);
__n -= __dn;
if (__n > 0) {
__m = ~__storage_type(0) >> (__bits_per_word - __n);
__b2 = *__result.__seg_ & __m;
*__result.__seg_ &= ~__m;
*__result.__seg_ |= __b1 >> __dn;
*__first.__seg_ |= __b2 << __dn;
__result.__ctz_ = static_cast<unsigned>(__n);
}
}
}
return __result;
}
template <class _Cl, class _Cr>
inline _LIBCPP_HIDE_FROM_ABI __bit_iterator<_Cr, false> swap_ranges(
__bit_iterator<_Cl, false> __first1, __bit_iterator<_Cl, false> __last1, __bit_iterator<_Cr, false> __first2) {
if (__first1.__ctz_ == __first2.__ctz_)
return std::__swap_ranges_aligned(__first1, __last1, __first2);
return std::__swap_ranges_unaligned(__first1, __last1, __first2);
}
// rotate
template <class _Cp>
struct __bit_array {
using difference_type = typename _Cp::difference_type;
using __storage_type = typename _Cp::__storage_type;
using __storage_pointer = typename _Cp::__storage_pointer;
using iterator = typename _Cp::iterator;
static const unsigned __bits_per_word = _Cp::__bits_per_word;
static const unsigned _Np = 4;
difference_type __size_;
__storage_type __word_[_Np];
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 static difference_type capacity() {
return static_cast<difference_type>(_Np * __bits_per_word);
}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit __bit_array(difference_type __s) : __size_(__s) {
if (__libcpp_is_constant_evaluated()) {
for (size_t __i = 0; __i != __bit_array<_Cp>::_Np; ++__i)
std::__construct_at(__word_ + __i, 0);
}
}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 iterator begin() {
return iterator(pointer_traits<__storage_pointer>::pointer_to(__word_[0]), 0);
}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 iterator end() {
return iterator(pointer_traits<__storage_pointer>::pointer_to(__word_[0]) + __size_ / __bits_per_word,
static_cast<unsigned>(__size_ % __bits_per_word));
}
};
template <class _Cp>
_LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI __bit_iterator<_Cp, false>
rotate(__bit_iterator<_Cp, false> __first, __bit_iterator<_Cp, false> __middle, __bit_iterator<_Cp, false> __last) {
using _I1 = __bit_iterator<_Cp, false>;
using difference_type = typename _I1::difference_type;
difference_type __d1 = __middle - __first;
difference_type __d2 = __last - __middle;
_I1 __r = __first + __d2;
while (__d1 != 0 && __d2 != 0) {
if (__d1 <= __d2) {
if (__d1 <= __bit_array<_Cp>::capacity()) {
__bit_array<_Cp> __b(__d1);
std::copy(__first, __middle, __b.begin());
std::copy(__b.begin(), __b.end(), std::copy(__middle, __last, __first));
break;
} else {
__bit_iterator<_Cp, false> __mp = std::swap_ranges(__first, __middle, __middle);
__first = __middle;
__middle = __mp;
__d2 -= __d1;
}
} else {
if (__d2 <= __bit_array<_Cp>::capacity()) {
__bit_array<_Cp> __b(__d2);
std::copy(__middle, __last, __b.begin());
std::copy_backward(__b.begin(), __b.end(), std::copy_backward(__first, __middle, __last));
break;
} else {
__bit_iterator<_Cp, false> __mp = __first + __d2;
std::swap_ranges(__first, __mp, __middle);
__first = __mp;
__d1 -= __d2;
}
}
}
return __r;
}
// equal
template <class _Cp, bool _IC1, bool _IC2>
_LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI bool __equal_unaligned(
__bit_iterator<_Cp, _IC1> __first1, __bit_iterator<_Cp, _IC1> __last1, __bit_iterator<_Cp, _IC2> __first2) {
using _It = __bit_iterator<_Cp, _IC1>;
using difference_type = typename _It::difference_type;
using __storage_type = typename _It::__storage_type;
const int __bits_per_word = _It::__bits_per_word;
difference_type __n = __last1 - __first1;
if (__n > 0) {
// do first word
if (__first1.__ctz_ != 0) {
unsigned __clz_f = __bits_per_word - __first1.__ctz_;
difference_type __dn = std::min(static_cast<difference_type>(__clz_f), __n);
__n -= __dn;
__storage_type __m = (~__storage_type(0) << __first1.__ctz_) & (~__storage_type(0) >> (__clz_f - __dn));
__storage_type __b = *__first1.__seg_ & __m;
unsigned __clz_r = __bits_per_word - __first2.__ctz_;
__storage_type __ddn = std::min<__storage_type>(__dn, __clz_r);
__m = (~__storage_type(0) << __first2.__ctz_) & (~__storage_type(0) >> (__clz_r - __ddn));
if (__first2.__ctz_ > __first1.__ctz_) {
if ((*__first2.__seg_ & __m) != (__b << (__first2.__ctz_ - __first1.__ctz_)))
return false;
} else {
if ((*__first2.__seg_ & __m) != (__b >> (__first1.__ctz_ - __first2.__ctz_)))
return false;
}
__first2.__seg_ += (__ddn + __first2.__ctz_) / __bits_per_word;
__first2.__ctz_ = static_cast<unsigned>((__ddn + __first2.__ctz_) % __bits_per_word);
__dn -= __ddn;
if (__dn > 0) {
__m = ~__storage_type(0) >> (__bits_per_word - __dn);
if ((*__first2.__seg_ & __m) != (__b >> (__first1.__ctz_ + __ddn)))
return false;
__first2.__ctz_ = static_cast<unsigned>(__dn);
}
++__first1.__seg_;
// __first1.__ctz_ = 0;
}
// __first1.__ctz_ == 0;
// do middle words
unsigned __clz_r = __bits_per_word - __first2.__ctz_;
__storage_type __m = ~__storage_type(0) << __first2.__ctz_;
for (; __n >= __bits_per_word; __n -= __bits_per_word, ++__first1.__seg_) {
__storage_type __b = *__first1.__seg_;
if ((*__first2.__seg_ & __m) != (__b << __first2.__ctz_))
return false;
++__first2.__seg_;
if ((*__first2.__seg_ & ~__m) != (__b >> __clz_r))
return false;
}
// do last word
if (__n > 0) {
__m = ~__storage_type(0) >> (__bits_per_word - __n);
__storage_type __b = *__first1.__seg_ & __m;
__storage_type __dn = std::min(__n, static_cast<difference_type>(__clz_r));
__m = (~__storage_type(0) << __first2.__ctz_) & (~__storage_type(0) >> (__clz_r - __dn));
if ((*__first2.__seg_ & __m) != (__b << __first2.__ctz_))
return false;
__first2.__seg_ += (__dn + __first2.__ctz_) / __bits_per_word;
__first2.__ctz_ = static_cast<unsigned>((__dn + __first2.__ctz_) % __bits_per_word);
__n -= __dn;
if (__n > 0) {
__m = ~__storage_type(0) >> (__bits_per_word - __n);
if ((*__first2.__seg_ & __m) != (__b >> __dn))
return false;
}
}
}
return true;
}
template <class _Cp, bool _IC1, bool _IC2>
_LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI bool __equal_aligned(
__bit_iterator<_Cp, _IC1> __first1, __bit_iterator<_Cp, _IC1> __last1, __bit_iterator<_Cp, _IC2> __first2) {
using _It = __bit_iterator<_Cp, _IC1>;
using difference_type = typename _It::difference_type;
using __storage_type = typename _It::__storage_type;
const int __bits_per_word = _It::__bits_per_word;
difference_type __n = __last1 - __first1;
if (__n > 0) {
// do first word
if (__first1.__ctz_ != 0) {
unsigned __clz = __bits_per_word - __first1.__ctz_;
difference_type __dn = std::min(static_cast<difference_type>(__clz), __n);
__n -= __dn;
__storage_type __m = (~__storage_type(0) << __first1.__ctz_) & (~__storage_type(0) >> (__clz - __dn));
if ((*__first2.__seg_ & __m) != (*__first1.__seg_ & __m))
return false;
++__first2.__seg_;
++__first1.__seg_;
// __first1.__ctz_ = 0;
// __first2.__ctz_ = 0;
}
// __first1.__ctz_ == 0;
// __first2.__ctz_ == 0;
// do middle words
for (; __n >= __bits_per_word; __n -= __bits_per_word, ++__first1.__seg_, ++__first2.__seg_)
if (*__first2.__seg_ != *__first1.__seg_)
return false;
// do last word
if (__n > 0) {
__storage_type __m = ~__storage_type(0) >> (__bits_per_word - __n);
if ((*__first2.__seg_ & __m) != (*__first1.__seg_ & __m))
return false;
}
}
return true;
}
template <class _Cp, bool _IC1, bool _IC2>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool
equal(__bit_iterator<_Cp, _IC1> __first1, __bit_iterator<_Cp, _IC1> __last1, __bit_iterator<_Cp, _IC2> __first2) {
if (__first1.__ctz_ == __first2.__ctz_)
return std::__equal_aligned(__first1, __last1, __first2);
return std::__equal_unaligned(__first1, __last1, __first2);
}
template <class _Cp, bool _IsConst, typename _Cp::__storage_type>
class __bit_iterator {
public:
using difference_type = typename _Cp::difference_type;
using value_type = bool;
using pointer = __bit_iterator;
#ifndef _LIBCPP_ABI_BITSET_VECTOR_BOOL_CONST_SUBSCRIPT_RETURN_BOOL
using reference = __conditional_t<_IsConst, __bit_const_reference<_Cp>, __bit_reference<_Cp> >;
#else
using reference = __conditional_t<_IsConst, bool, __bit_reference<_Cp> >;
#endif
using iterator_category = random_access_iterator_tag;
private:
using __storage_type = typename _Cp::__storage_type;
using __storage_pointer =
__conditional_t<_IsConst, typename _Cp::__const_storage_pointer, typename _Cp::__storage_pointer>;
static const unsigned __bits_per_word = _Cp::__bits_per_word;
__storage_pointer __seg_;
unsigned __ctz_;
public:
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __bit_iterator() _NOEXCEPT
#if _LIBCPP_STD_VER >= 14
: __seg_(nullptr),
__ctz_(0)
#endif
{
}
// When _IsConst=false, this is the copy constructor.
// It is non-trivial. Making it trivial would break ABI.
// When _IsConst=true, this is a converting constructor;
// the copy and move constructors are implicitly generated
// and trivial.
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __bit_iterator(const __bit_iterator<_Cp, false>& __it) _NOEXCEPT
: __seg_(__it.__seg_),
__ctz_(__it.__ctz_) {}
// When _IsConst=false, we have a user-provided copy constructor,
// so we must also provide a copy assignment operator because
// the implicit generation of a defaulted one is deprecated.
// When _IsConst=true, the assignment operators are
// implicitly generated and trivial.
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __bit_iterator&
operator=(const _If<_IsConst, struct __private_nat, __bit_iterator>& __it) {
__seg_ = __it.__seg_;
__ctz_ = __it.__ctz_;
return *this;
}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 reference operator*() const _NOEXCEPT {
return __conditional_t<_IsConst, __bit_const_reference<_Cp>, __bit_reference<_Cp> >(
__seg_, __storage_type(1) << __ctz_);
}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __bit_iterator& operator++() {
if (__ctz_ != __bits_per_word - 1)
++__ctz_;
else {
__ctz_ = 0;
++__seg_;
}
return *this;
}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __bit_iterator operator++(int) {
__bit_iterator __tmp = *this;
++(*this);
return __tmp;
}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __bit_iterator& operator--() {
if (__ctz_ != 0)
--__ctz_;
else {
__ctz_ = __bits_per_word - 1;
--__seg_;
}
return *this;
}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __bit_iterator operator--(int) {
__bit_iterator __tmp = *this;
--(*this);
return __tmp;
}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __bit_iterator& operator+=(difference_type __n) {
if (__n >= 0)
__seg_ += (__n + __ctz_) / __bits_per_word;
else
__seg_ += static_cast<difference_type>(__n - __bits_per_word + __ctz_ + 1) /
static_cast<difference_type>(__bits_per_word);
__n &= (__bits_per_word - 1);
__ctz_ = static_cast<unsigned>((__n + __ctz_) % __bits_per_word);
return *this;
}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __bit_iterator& operator-=(difference_type __n) {
return *this += -__n;
}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __bit_iterator operator+(difference_type __n) const {
__bit_iterator __t(*this);
__t += __n;
return __t;
}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __bit_iterator operator-(difference_type __n) const {
__bit_iterator __t(*this);
__t -= __n;
return __t;
}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 friend __bit_iterator
operator+(difference_type __n, const __bit_iterator& __it) {
return __it + __n;
}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 friend difference_type
operator-(const __bit_iterator& __x, const __bit_iterator& __y) {
return (__x.__seg_ - __y.__seg_) * __bits_per_word + __x.__ctz_ - __y.__ctz_;
}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 reference operator[](difference_type __n) const {
return *(*this + __n);
}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 friend bool
operator==(const __bit_iterator& __x, const __bit_iterator& __y) {
return __x.__seg_ == __y.__seg_ && __x.__ctz_ == __y.__ctz_;
}
#if _LIBCPP_STD_VER <= 17
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 friend bool
operator!=(const __bit_iterator& __x, const __bit_iterator& __y) {
return !(__x == __y);
}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 friend bool
operator<(const __bit_iterator& __x, const __bit_iterator& __y) {
return __x.__seg_ < __y.__seg_ || (__x.__seg_ == __y.__seg_ && __x.__ctz_ < __y.__ctz_);
}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 friend bool
operator>(const __bit_iterator& __x, const __bit_iterator& __y) {
return __y < __x;
}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 friend bool
operator<=(const __bit_iterator& __x, const __bit_iterator& __y) {
return !(__y < __x);
}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 friend bool
operator>=(const __bit_iterator& __x, const __bit_iterator& __y) {
return !(__x < __y);
}
#else // _LIBCPP_STD_VER <= 17
_LIBCPP_HIDE_FROM_ABI constexpr friend strong_ordering
operator<=>(const __bit_iterator& __x, const __bit_iterator& __y) {
if (__x.__seg_ < __y.__seg_)
return strong_ordering::less;
if (__x.__seg_ == __y.__seg_)
return __x.__ctz_ <=> __y.__ctz_;
return strong_ordering::greater;
}
#endif // _LIBCPP_STD_VER <= 17
private:
_LIBCPP_HIDE_FROM_ABI
_LIBCPP_CONSTEXPR_SINCE_CXX20 explicit __bit_iterator(__storage_pointer __s, unsigned __ctz) _NOEXCEPT
: __seg_(__s),
__ctz_(__ctz) {}
friend typename _Cp::__self;
friend class __bit_reference<_Cp>;
friend class __bit_const_reference<_Cp>;
friend class __bit_iterator<_Cp, true>;
template <class _Dp>
friend struct __bit_array;
template <bool _FillVal, class _Dp>
_LIBCPP_CONSTEXPR_SINCE_CXX20 friend void
__fill_n_bool(__bit_iterator<_Dp, false> __first, typename _Dp::size_type __n);
template <class _Dp, bool _IC>
_LIBCPP_CONSTEXPR_SINCE_CXX20 friend __bit_iterator<_Dp, false> __copy_aligned(
__bit_iterator<_Dp, _IC> __first, __bit_iterator<_Dp, _IC> __last, __bit_iterator<_Dp, false> __result);
template <class _Dp, bool _IC>
_LIBCPP_CONSTEXPR_SINCE_CXX20 friend __bit_iterator<_Dp, false> __copy_unaligned(
__bit_iterator<_Dp, _IC> __first, __bit_iterator<_Dp, _IC> __last, __bit_iterator<_Dp, false> __result);
template <class _Dp, bool _IC>
_LIBCPP_CONSTEXPR_SINCE_CXX20 friend __bit_iterator<_Dp, false>
copy(__bit_iterator<_Dp, _IC> __first, __bit_iterator<_Dp, _IC> __last, __bit_iterator<_Dp, false> __result);
template <class _Dp, bool _IC>
_LIBCPP_CONSTEXPR_SINCE_CXX20 friend __bit_iterator<_Dp, false> __copy_backward_aligned(
__bit_iterator<_Dp, _IC> __first, __bit_iterator<_Dp, _IC> __last, __bit_iterator<_Dp, false> __result);
template <class _Dp, bool _IC>
_LIBCPP_CONSTEXPR_SINCE_CXX20 friend __bit_iterator<_Dp, false> __copy_backward_unaligned(
__bit_iterator<_Dp, _IC> __first, __bit_iterator<_Dp, _IC> __last, __bit_iterator<_Dp, false> __result);
template <class _Dp, bool _IC>
_LIBCPP_CONSTEXPR_SINCE_CXX20 friend __bit_iterator<_Dp, false>
copy_backward(__bit_iterator<_Dp, _IC> __first, __bit_iterator<_Dp, _IC> __last, __bit_iterator<_Dp, false> __result);
template <class _Cl, class _Cr>
friend __bit_iterator<_Cr, false>
__swap_ranges_aligned(__bit_iterator<_Cl, false>, __bit_iterator<_Cl, false>, __bit_iterator<_Cr, false>);
template <class _Cl, class _Cr>
friend __bit_iterator<_Cr, false>
__swap_ranges_unaligned(__bit_iterator<_Cl, false>, __bit_iterator<_Cl, false>, __bit_iterator<_Cr, false>);
template <class _Cl, class _Cr>
friend __bit_iterator<_Cr, false>
swap_ranges(__bit_iterator<_Cl, false>, __bit_iterator<_Cl, false>, __bit_iterator<_Cr, false>);
template <class _Dp>
_LIBCPP_CONSTEXPR_SINCE_CXX20 friend __bit_iterator<_Dp, false>
rotate(__bit_iterator<_Dp, false>, __bit_iterator<_Dp, false>, __bit_iterator<_Dp, false>);