// -*- 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___CXX03_BITSET
#define _LIBCPP___CXX03_BITSET

// clang-format off

/*
    bitset synopsis

namespace std
{

namespace std {

template <size_t N>
class bitset
{
public:
    // bit reference:
    class reference
    {
        friend class bitset;
        reference() noexcept;
    public:
        ~reference() noexcept;
        reference& operator=(bool x) noexcept;           // for b[i] = x;
        reference& operator=(const reference&) noexcept; // for b[i] = b[j];
        bool operator~() const noexcept;                 // flips the bit
        operator bool() const noexcept;                  // for x = b[i];
        reference& flip() noexcept;                      // for b[i].flip();
    };

    // 23.3.5.1 constructors:
    constexpr bitset() noexcept;
    constexpr bitset(unsigned long long val) noexcept;
    template <class charT>
        constexpr explicit bitset(const charT* str,
            typename basic_string<charT>::size_type n = basic_string<charT>::npos,
            charT zero = charT('0'), charT one = charT('1'));                                // until C++26, constexpr since C++23
    template <class charT>
        constexpr explicit bitset(const charT* str,
            typename basic_string_view<charT>::size_type n = basic_string_view<charT>::npos,
            charT zero = charT('0'), charT one = charT('1'));                                // since C++26
    template<class charT, class traits>
        explicit bitset(
            const basic_string_view<charT,traits>& str,
            typename basic_string_view<charT,traits>::size_type pos = 0,
            typename basic_string_view<charT,traits>::size_type n = basic_string_view<charT,traits>::npos,
            charT zero = charT('0'), charT one = charT('1'));                                // since C++26
    template<class charT, class traits, class Allocator>
        constexpr explicit bitset(
            const basic_string<charT,traits,Allocator>& str,
            typename basic_string<charT,traits,Allocator>::size_type pos = 0,
            typename basic_string<charT,traits,Allocator>::size_type n = basic_string<charT,traits,Allocator>::npos,
            charT zero = charT('0'), charT one = charT('1'));                                // constexpr since C++23

    // 23.3.5.2 bitset operations:
    bitset& operator&=(const bitset& rhs) noexcept; // constexpr since C++23
    bitset& operator|=(const bitset& rhs) noexcept; // constexpr since C++23
    bitset& operator^=(const bitset& rhs) noexcept; // constexpr since C++23
    bitset& operator<<=(size_t pos) noexcept;       // constexpr since C++23
    bitset& operator>>=(size_t pos) noexcept;       // constexpr since C++23
    bitset& set() noexcept;                         // constexpr since C++23
    bitset& set(size_t pos, bool val = true);       // constexpr since C++23
    bitset& reset() noexcept;                       // constexpr since C++23
    bitset& reset(size_t pos);                      // constexpr since C++23
    bitset operator~() const noexcept;              // constexpr since C++23
    bitset& flip() noexcept;                        // constexpr since C++23
    bitset& flip(size_t pos);                       // constexpr since C++23

    // element access:
    constexpr bool operator[](size_t pos) const;
    reference operator[](size_t pos);            // constexpr since C++23
    unsigned long to_ulong() const;              // constexpr since C++23
    unsigned long long to_ullong() const;        // constexpr since C++23
    template <class charT, class traits, class Allocator> // constexpr since C++23
        basic_string<charT, traits, Allocator> to_string(charT zero = charT('0'), charT one = charT('1')) const;
    template <class charT, class traits> // constexpr since C++23
        basic_string<charT, traits, allocator<charT> > to_string(charT zero = charT('0'), charT one = charT('1')) const;
    template <class charT> // constexpr since C++23
        basic_string<charT, char_traits<charT>, allocator<charT> > to_string(charT zero = charT('0'), charT one = charT('1')) const;
    basic_string<char, char_traits<char>, allocator<char> > to_string(char zero = '0', char one = '1') const; // constexpr since C++23
    size_t count() const noexcept;                     // constexpr since C++23
    constexpr size_t size() const noexcept;            // constexpr since C++23
    bool operator==(const bitset& rhs) const noexcept; // constexpr since C++23
    bool operator!=(const bitset& rhs) const noexcept; // removed in C++20
    bool test(size_t pos) const;                       // constexpr since C++23
    bool all() const noexcept;                         // constexpr since C++23
    bool any() const noexcept;                         // constexpr since C++23
    bool none() const noexcept;                        // constexpr since C++23
    bitset<N> operator<<(size_t pos) const noexcept;   // constexpr since C++23
    bitset<N> operator>>(size_t pos) const noexcept;   // constexpr since C++23
};

// 23.3.5.3 bitset operators:
template <size_t N>
bitset<N> operator&(const bitset<N>&, const bitset<N>&) noexcept; // constexpr since C++23

template <size_t N>
bitset<N> operator|(const bitset<N>&, const bitset<N>&) noexcept; // constexpr since C++23

template <size_t N>
bitset<N> operator^(const bitset<N>&, const bitset<N>&) noexcept; // constexpr since C++23

template <class charT, class traits, size_t N>
basic_istream<charT, traits>&
operator>>(basic_istream<charT, traits>& is, bitset<N>& x);

template <class charT, class traits, size_t N>
basic_ostream<charT, traits>&
operator<<(basic_ostream<charT, traits>& os, const bitset<N>& x);

template <size_t N> struct hash<std::bitset<N>>;

}  // std

*/

// clang-format on

#include <__cxx03/__algorithm/count.h>
#include <__cxx03/__algorithm/fill.h>
#include <__cxx03/__algorithm/find.h>
#include <__cxx03/__bit_reference>
#include <__cxx03/__config>
#include <__cxx03/__functional/hash.h>
#include <__cxx03/__functional/unary_function.h>
#include <__cxx03/__type_traits/is_char_like_type.h>
#include <__cxx03/climits>
#include <__cxx03/cstddef>
#include <__cxx03/stdexcept>
#include <__cxx03/string_view>
#include <__cxx03/version>

// standard-mandated includes

// [bitset.syn]
#include <__cxx03/iosfwd>
#include <__cxx03/string>

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

_LIBCPP_PUSH_MACROS
#include <__cxx03/__undef_macros>

_LIBCPP_BEGIN_NAMESPACE_STD

template <size_t _N_words, size_t _Size>
class __bitset;

template <size_t _N_words, size_t _Size>
struct __has_storage_type<__bitset<_N_words, _Size> > {
  static const bool value = true;
};

template <size_t _N_words, size_t _Size>
class __bitset {
public:
  typedef ptrdiff_t difference_type;
  typedef size_t size_type;
  typedef size_type __storage_type;

protected:
  typedef __bitset __self;
  typedef __storage_type* __storage_pointer;
  typedef const __storage_type* __const_storage_pointer;
  static const unsigned __bits_per_word = static_cast<unsigned>(sizeof(__storage_type) * CHAR_BIT);

  friend class __bit_reference<__bitset>;
  friend class __bit_const_reference<__bitset>;
  friend class __bit_iterator<__bitset, false>;
  friend class __bit_iterator<__bitset, true>;
  friend struct __bit_array<__bitset>;

  __storage_type __first_[_N_words];

  typedef __bit_reference<__bitset> reference;
  typedef __bit_const_reference<__bitset> __const_reference;
  typedef __bit_iterator<__bitset, false> __iterator;
  typedef __bit_iterator<__bitset, true> __const_iterator;

  _LIBCPP_HIDE_FROM_ABI __bitset() _NOEXCEPT;
  _LIBCPP_HIDE_FROM_ABI explicit __bitset(unsigned long long __v) _NOEXCEPT;

  _LIBCPP_HIDE_FROM_ABI reference __make_ref(size_t __pos) _NOEXCEPT {
    return reference(__first_ + __pos / __bits_per_word, __storage_type(1) << __pos % __bits_per_word);
  }
  _LIBCPP_HIDE_FROM_ABI __const_reference __make_ref(size_t __pos) const _NOEXCEPT {
    return __const_reference(__first_ + __pos / __bits_per_word, __storage_type(1) << __pos % __bits_per_word);
  }
  _LIBCPP_HIDE_FROM_ABI __iterator __make_iter(size_t __pos) _NOEXCEPT {
    return __iterator(__first_ + __pos / __bits_per_word, __pos % __bits_per_word);
  }
  _LIBCPP_HIDE_FROM_ABI __const_iterator __make_iter(size_t __pos) const _NOEXCEPT {
    return __const_iterator(__first_ + __pos / __bits_per_word, __pos % __bits_per_word);
  }

  _LIBCPP_HIDE_FROM_ABI void operator&=(const __bitset& __v) _NOEXCEPT;
  _LIBCPP_HIDE_FROM_ABI void operator|=(const __bitset& __v) _NOEXCEPT;
  _LIBCPP_HIDE_FROM_ABI void operator^=(const __bitset& __v) _NOEXCEPT;

  _LIBCPP_HIDE_FROM_ABI void flip() _NOEXCEPT;
  _LIBCPP_HIDE_FROM_ABI unsigned long to_ulong() const {
    return to_ulong(integral_constant < bool, _Size< sizeof(unsigned long) * CHAR_BIT>());
  }
  _LIBCPP_HIDE_FROM_ABI unsigned long long to_ullong() const {
    return to_ullong(integral_constant < bool, _Size< sizeof(unsigned long long) * CHAR_BIT>());
  }

  _LIBCPP_HIDE_FROM_ABI bool all() const _NOEXCEPT;
  _LIBCPP_HIDE_FROM_ABI bool any() const _NOEXCEPT;
  _LIBCPP_HIDE_FROM_ABI size_t __hash_code() const _NOEXCEPT;

private:
  void __init(unsigned long long __v, false_type) _NOEXCEPT;
  _LIBCPP_HIDE_FROM_ABI void __init(unsigned long long __v, true_type) _NOEXCEPT;
  _LIBCPP_HIDE_FROM_ABI unsigned long to_ulong(false_type) const;
  _LIBCPP_HIDE_FROM_ABI unsigned long to_ulong(true_type) const;
  _LIBCPP_HIDE_FROM_ABI unsigned long long to_ullong(false_type) const;
  _LIBCPP_HIDE_FROM_ABI unsigned long long to_ullong(true_type) const;
  _LIBCPP_HIDE_FROM_ABI unsigned long long to_ullong(true_type, false_type) const;
  _LIBCPP_HIDE_FROM_ABI unsigned long long to_ullong(true_type, true_type) const;
};

template <size_t _N_words, size_t _Size>
inline __bitset<_N_words, _Size>::__bitset() _NOEXCEPT {
  std::fill_n(__first_, _N_words, __storage_type(0));
}

template <size_t _N_words, size_t _Size>
void __bitset<_N_words, _Size>::__init(unsigned long long __v, false_type) _NOEXCEPT {
  __storage_type __t[sizeof(unsigned long long) / sizeof(__storage_type)];
  size_t __sz = _Size;
  for (size_t __i = 0; __i < sizeof(__t) / sizeof(__t[0]); ++__i, __v >>= __bits_per_word, __sz -= __bits_per_word)
    if (__sz < __bits_per_word)
      __t[__i] = static_cast<__storage_type>(__v) & (1ULL << __sz) - 1;
    else
      __t[__i] = static_cast<__storage_type>(__v);

  std::copy(__t, __t + sizeof(__t) / sizeof(__t[0]), __first_);
  std::fill(
      __first_ + sizeof(__t) / sizeof(__t[0]), __first_ + sizeof(__first_) / sizeof(__first_[0]), __storage_type(0));
}

template <size_t _N_words, size_t _Size>
inline _LIBCPP_HIDE_FROM_ABI void __bitset<_N_words, _Size>::__init(unsigned long long __v, true_type) _NOEXCEPT {
  __first_[0] = __v;
  if (_Size < __bits_per_word)
    __first_[0] &= (1ULL << _Size) - 1;

  std::fill(__first_ + 1, __first_ + sizeof(__first_) / sizeof(__first_[0]), __storage_type(0));
}

template <size_t _N_words, size_t _Size>
inline __bitset<_N_words, _Size>::__bitset(unsigned long long __v) _NOEXCEPT {
  __init(__v, integral_constant<bool, sizeof(unsigned long long) == sizeof(__storage_type)>());
}

template <size_t _N_words, size_t _Size>
inline _LIBCPP_HIDE_FROM_ABI void __bitset<_N_words, _Size>::operator&=(const __bitset& __v) _NOEXCEPT {
  for (size_type __i = 0; __i < _N_words; ++__i)
    __first_[__i] &= __v.__first_[__i];
}

template <size_t _N_words, size_t _Size>
inline _LIBCPP_HIDE_FROM_ABI void __bitset<_N_words, _Size>::operator|=(const __bitset& __v) _NOEXCEPT {
  for (size_type __i = 0; __i < _N_words; ++__i)
    __first_[__i] |= __v.__first_[__i];
}

template <size_t _N_words, size_t _Size>
inline _LIBCPP_HIDE_FROM_ABI void __bitset<_N_words, _Size>::operator^=(const __bitset& __v) _NOEXCEPT {
  for (size_type __i = 0; __i < _N_words; ++__i)
    __first_[__i] ^= __v.__first_[__i];
}

template <size_t _N_words, size_t _Size>
_LIBCPP_HIDE_FROM_ABI void __bitset<_N_words, _Size>::flip() _NOEXCEPT {
  // do middle whole words
  size_type __n         = _Size;
  __storage_pointer __p = __first_;
  for (; __n >= __bits_per_word; ++__p, __n -= __bits_per_word)
    *__p = ~*__p;
  // do last partial word
  if (__n > 0) {
    __storage_type __m = ~__storage_type(0) >> (__bits_per_word - __n);
    __storage_type __b = *__p & __m;
    *__p &= ~__m;
    *__p |= ~__b & __m;
  }
}

template <size_t _N_words, size_t _Size>
_LIBCPP_HIDE_FROM_ABI unsigned long __bitset<_N_words, _Size>::to_ulong(false_type) const {
  __const_iterator __e = __make_iter(_Size);
  __const_iterator __i = std::find(__make_iter(sizeof(unsigned long) * CHAR_BIT), __e, true);
  if (__i != __e)
    __throw_overflow_error("bitset to_ulong overflow error");

  return __first_[0];
}

template <size_t _N_words, size_t _Size>
inline _LIBCPP_HIDE_FROM_ABI unsigned long __bitset<_N_words, _Size>::to_ulong(true_type) const {
  return __first_[0];
}

template <size_t _N_words, size_t _Size>
_LIBCPP_HIDE_FROM_ABI unsigned long long __bitset<_N_words, _Size>::to_ullong(false_type) const {
  __const_iterator __e = __make_iter(_Size);
  __const_iterator __i = std::find(__make_iter(sizeof(unsigned long long) * CHAR_BIT), __e, true);
  if (__i != __e)
    __throw_overflow_error("bitset to_ullong overflow error");

  return to_ullong(true_type());
}

template <size_t _N_words, size_t _Size>
inline _LIBCPP_HIDE_FROM_ABI unsigned long long __bitset<_N_words, _Size>::to_ullong(true_type) const {
  return to_ullong(true_type(), integral_constant<bool, sizeof(__storage_type) < sizeof(unsigned long long)>());
}

template <size_t _N_words, size_t _Size>
inline _LIBCPP_HIDE_FROM_ABI unsigned long long __bitset<_N_words, _Size>::to_ullong(true_type, false_type) const {
  return __first_[0];
}

template <size_t _N_words, size_t _Size>
_LIBCPP_HIDE_FROM_ABI unsigned long long __bitset<_N_words, _Size>::to_ullong(true_type, true_type) const {
  unsigned long long __r = __first_[0];
  _LIBCPP_DIAGNOSTIC_PUSH
  _LIBCPP_GCC_DIAGNOSTIC_IGNORED("-Wshift-count-overflow")
  for (size_t __i = 1; __i < sizeof(unsigned long long) / sizeof(__storage_type); ++__i)
    __r |= static_cast<unsigned long long>(__first_[__i]) << (sizeof(__storage_type) * CHAR_BIT);
  _LIBCPP_DIAGNOSTIC_POP
  return __r;
}

template <size_t _N_words, size_t _Size>
_LIBCPP_HIDE_FROM_ABI bool __bitset<_N_words, _Size>::all() const _NOEXCEPT {
  // do middle whole words
  size_type __n               = _Size;
  __const_storage_pointer __p = __first_;
  for (; __n >= __bits_per_word; ++__p, __n -= __bits_per_word)
    if (~*__p)
      return false;
  // do last partial word
  if (__n > 0) {
    __storage_type __m = ~__storage_type(0) >> (__bits_per_word - __n);
    if (~*__p & __m)
      return false;
  }
  return true;
}

template <size_t _N_words, size_t _Size>
_LIBCPP_HIDE_FROM_ABI bool __bitset<_N_words, _Size>::any() const _NOEXCEPT {
  // do middle whole words
  size_type __n               = _Size;
  __const_storage_pointer __p = __first_;
  for (; __n >= __bits_per_word; ++__p, __n -= __bits_per_word)
    if (*__p)
      return true;
  // do last partial word
  if (__n > 0) {
    __storage_type __m = ~__storage_type(0) >> (__bits_per_word - __n);
    if (*__p & __m)
      return true;
  }
  return false;
}

template <size_t _N_words, size_t _Size>
inline size_t __bitset<_N_words, _Size>::__hash_code() const _NOEXCEPT {
  size_t __h = 0;
  for (size_type __i = 0; __i < _N_words; ++__i)
    __h ^= __first_[__i];
  return __h;
}

template <size_t _Size>
class __bitset<1, _Size> {
public:
  typedef ptrdiff_t difference_type;
  typedef size_t size_type;
  typedef size_type __storage_type;

protected:
  typedef __bitset __self;
  typedef __storage_type* __storage_pointer;
  typedef const __storage_type* __const_storage_pointer;
  static const unsigned __bits_per_word = static_cast<unsigned>(sizeof(__storage_type) * CHAR_BIT);

  friend class __bit_reference<__bitset>;
  friend class __bit_const_reference<__bitset>;
  friend class __bit_iterator<__bitset, false>;
  friend class __bit_iterator<__bitset, true>;
  friend struct __bit_array<__bitset>;

  __storage_type __first_;

  typedef __bit_reference<__bitset> reference;
  typedef __bit_const_reference<__bitset> __const_reference;
  typedef __bit_iterator<__bitset, false> __iterator;
  typedef __bit_iterator<__bitset, true> __const_iterator;

  _LIBCPP_HIDE_FROM_ABI __bitset() _NOEXCEPT;
  _LIBCPP_HIDE_FROM_ABI explicit __bitset(unsigned long long __v) _NOEXCEPT;

  _LIBCPP_HIDE_FROM_ABI reference __make_ref(size_t __pos) _NOEXCEPT {
    return reference(&__first_, __storage_type(1) << __pos);
  }
  _LIBCPP_HIDE_FROM_ABI __const_reference __make_ref(size_t __pos) const _NOEXCEPT {
    return __const_reference(&__first_, __storage_type(1) << __pos);
  }
  _LIBCPP_HIDE_FROM_ABI __iterator __make_iter(size_t __pos) _NOEXCEPT {
    return __iterator(&__first_ + __pos / __bits_per_word, __pos % __bits_per_word);
  }
  _LIBCPP_HIDE_FROM_ABI __const_iterator __make_iter(size_t __pos) const _NOEXCEPT {
    return __const_iterator(&__first_ + __pos / __bits_per_word, __pos % __bits_per_word);
  }

  _LIBCPP_HIDE_FROM_ABI void operator&=(const __bitset& __v) _NOEXCEPT;
  _LIBCPP_HIDE_FROM_ABI void operator|=(const __bitset& __v) _NOEXCEPT;
  _LIBCPP_HIDE_FROM_ABI void operator^=(const __bitset& __v) _NOEXCEPT;

  _LIBCPP_HIDE_FROM_ABI void flip() _NOEXCEPT;

  _LIBCPP_HIDE_FROM_ABI unsigned long to_ulong() const;
  _LIBCPP_HIDE_FROM_ABI unsigned long long to_ullong() const;

  _LIBCPP_HIDE_FROM_ABI bool all() const _NOEXCEPT;
  _LIBCPP_HIDE_FROM_ABI bool any() const _NOEXCEPT;

  _LIBCPP_HIDE_FROM_ABI size_t __hash_code() const _NOEXCEPT;
};

template <size_t _Size>
inline __bitset<1, _Size>::__bitset() _NOEXCEPT : __first_(0) {}

template <size_t _Size>
inline __bitset<1, _Size>::__bitset(unsigned long long __v) _NOEXCEPT
    : __first_(_Size == __bits_per_word ? static_cast<__storage_type>(__v)
                                        : static_cast<__storage_type>(__v) & ((__storage_type(1) << _Size) - 1)) {}

template <size_t _Size>
inline _LIBCPP_HIDE_FROM_ABI void __bitset<1, _Size>::operator&=(const __bitset& __v) _NOEXCEPT {
  __first_ &= __v.__first_;
}

template <size_t _Size>
inline _LIBCPP_HIDE_FROM_ABI void __bitset<1, _Size>::operator|=(const __bitset& __v) _NOEXCEPT {
  __first_ |= __v.__first_;
}

template <size_t _Size>
inline _LIBCPP_HIDE_FROM_ABI void __bitset<1, _Size>::operator^=(const __bitset& __v) _NOEXCEPT {
  __first_ ^= __v.__first_;
}

template <size_t _Size>
inline _LIBCPP_HIDE_FROM_ABI void __bitset<1, _Size>::flip() _NOEXCEPT {
  __storage_type __m = ~__storage_type(0) >> (__bits_per_word - _Size);
  __first_           = ~__first_;
  __first_ &= __m;
}

template <size_t _Size>
inline unsigned long __bitset<1, _Size>::to_ulong() const {
  return __first_;
}

template <size_t _Size>
inline _LIBCPP_HIDE_FROM_ABI unsigned long long __bitset<1, _Size>::to_ullong() const {
  return __first_;
}

template <size_t _Size>
inline _LIBCPP_HIDE_FROM_ABI bool __bitset<1, _Size>::all() const _NOEXCEPT {
  __storage_type __m = ~__storage_type(0) >> (__bits_per_word - _Size);
  return !(~__first_ & __m);
}

template <size_t _Size>
inline _LIBCPP_HIDE_FROM_ABI bool __bitset<1, _Size>::any() const _NOEXCEPT {
  __storage_type __m = ~__storage_type(0) >> (__bits_per_word - _Size);
  return __first_ & __m;
}

template <size_t _Size>
inline size_t __bitset<1, _Size>::__hash_code() const _NOEXCEPT {
  return __first_;
}

template <>
class __bitset<0, 0> {
public:
  typedef ptrdiff_t difference_type;
  typedef size_t size_type;
  typedef size_type __storage_type;

protected:
  typedef __bitset __self;
  typedef __storage_type* __storage_pointer;
  typedef const __storage_type* __const_storage_pointer;
  static const unsigned __bits_per_word = static_cast<unsigned>(sizeof(__storage_type) * CHAR_BIT);

  friend class __bit_reference<__bitset>;
  friend class __bit_const_reference<__bitset>;
  friend class __bit_iterator<__bitset, false>;
  friend class __bit_iterator<__bitset, true>;
  friend struct __bit_array<__bitset>;

  typedef __bit_reference<__bitset> reference;
  typedef __bit_const_reference<__bitset> __const_reference;
  typedef __bit_iterator<__bitset, false> __iterator;
  typedef __bit_iterator<__bitset, true> __const_iterator;

  _LIBCPP_HIDE_FROM_ABI __bitset() _NOEXCEPT;
  _LIBCPP_HIDE_FROM_ABI explicit __bitset(unsigned long long) _NOEXCEPT;

  _LIBCPP_HIDE_FROM_ABI reference __make_ref(size_t) _NOEXCEPT { return reference(nullptr, 1); }
  _LIBCPP_HIDE_FROM_ABI __const_reference __make_ref(size_t) const _NOEXCEPT { return __const_reference(nullptr, 1); }
  _LIBCPP_HIDE_FROM_ABI __iterator __make_iter(size_t) _NOEXCEPT { return __iterator(nullptr, 0); }
  _LIBCPP_HIDE_FROM_ABI __const_iterator __make_iter(size_t) const _NOEXCEPT { return __const_iterator(nullptr, 0); }

  _LIBCPP_HIDE_FROM_ABI void operator&=(const __bitset&) _NOEXCEPT {}
  _LIBCPP_HIDE_FROM_ABI void operator|=(const __bitset&) _NOEXCEPT {}
  _LIBCPP_HIDE_FROM_ABI void operator^=(const __bitset&) _NOEXCEPT {}

  _LIBCPP_HIDE_FROM_ABI void flip() _NOEXCEPT {}

  _LIBCPP_HIDE_FROM_ABI unsigned long to_ulong() const { return 0; }
  _LIBCPP_HIDE_FROM_ABI unsigned long long to_ullong() const { return 0; }

  _LIBCPP_HIDE_FROM_ABI bool all() const _NOEXCEPT { return true; }
  _LIBCPP_HIDE_FROM_ABI bool any() const _NOEXCEPT { return false; }

  _LIBCPP_HIDE_FROM_ABI size_t __hash_code() const _NOEXCEPT { return 0; }
};

inline __bitset<0, 0>::__bitset() _NOEXCEPT {}

inline __bitset<0, 0>::__bitset(unsigned long long) _NOEXCEPT {}

template <size_t _Size>
class _LIBCPP_TEMPLATE_VIS bitset;
template <size_t _Size>
struct hash<bitset<_Size> >;

template <size_t _Size>
class _LIBCPP_TEMPLATE_VIS bitset
    : private __bitset<_Size == 0 ? 0 : (_Size - 1) / (sizeof(size_t) * CHAR_BIT) + 1, _Size> {
public:
  static const unsigned __n_words = _Size == 0 ? 0 : (_Size - 1) / (sizeof(size_t) * CHAR_BIT) + 1;
  typedef __bitset<__n_words, _Size> __base;

public:
  typedef typename __base::reference reference;
  typedef typename __base::__const_reference __const_reference;

  // 23.3.5.1 constructors:
  _LIBCPP_HIDE_FROM_ABI bitset() _NOEXCEPT {}
  _LIBCPP_HIDE_FROM_ABI bitset(unsigned long long __v) _NOEXCEPT : __base(__v) {}
  template <class _CharT, __enable_if_t<_IsCharLikeType<_CharT>::value, int> = 0>
  _LIBCPP_HIDE_FROM_ABI explicit bitset(
      const _CharT* __str,
      typename basic_string<_CharT>::size_type __n = basic_string<_CharT>::npos,
      _CharT __zero                                = _CharT('0'),
      _CharT __one                                 = _CharT('1')) {
    size_t __rlen = std::min(__n, char_traits<_CharT>::length(__str));
    __init_from_string_view(basic_string_view<_CharT>(__str, __rlen), __zero, __one);
  }

  template <class _CharT, class _Traits, class _Allocator>
  _LIBCPP_HIDE_FROM_ABI explicit bitset(
      const basic_string<_CharT, _Traits, _Allocator>& __str,
      typename basic_string<_CharT, _Traits, _Allocator>::size_type __pos = 0,
      typename basic_string<_CharT, _Traits, _Allocator>::size_type __n =
          basic_string<_CharT, _Traits, _Allocator>::npos,
      _CharT __zero = _CharT('0'),
      _CharT __one  = _CharT('1')) {
    if (__pos > __str.size())
      std::__throw_out_of_range("bitset string pos out of range");

    size_t __rlen = std::min(__n, __str.size() - __pos);
    __init_from_string_view(basic_string_view<_CharT, _Traits>(__str.data() + __pos, __rlen), __zero, __one);
  }

  // 23.3.5.2 bitset operations:
  _LIBCPP_HIDE_FROM_ABI bitset& operator&=(const bitset& __rhs) _NOEXCEPT;
  _LIBCPP_HIDE_FROM_ABI bitset& operator|=(const bitset& __rhs) _NOEXCEPT;
  _LIBCPP_HIDE_FROM_ABI bitset& operator^=(const bitset& __rhs) _NOEXCEPT;
  _LIBCPP_HIDE_FROM_ABI bitset& operator<<=(size_t __pos) _NOEXCEPT;
  _LIBCPP_HIDE_FROM_ABI bitset& operator>>=(size_t __pos) _NOEXCEPT;
  _LIBCPP_HIDE_FROM_ABI bitset& set() _NOEXCEPT;
  _LIBCPP_HIDE_FROM_ABI bitset& set(size_t __pos, bool __val = true);
  _LIBCPP_HIDE_FROM_ABI bitset& reset() _NOEXCEPT;
  _LIBCPP_HIDE_FROM_ABI bitset& reset(size_t __pos);
  _LIBCPP_HIDE_FROM_ABI bitset operator~() const _NOEXCEPT;
  _LIBCPP_HIDE_FROM_ABI bitset& flip() _NOEXCEPT;
  _LIBCPP_HIDE_FROM_ABI bitset& flip(size_t __pos);

  // element access:
#ifdef _LIBCPP_ABI_BITSET_VECTOR_BOOL_CONST_SUBSCRIPT_RETURN_BOOL
  _LIBCPP_HIDE_FROM_ABI bool operator[](size_t __p) const { return __base::__make_ref(__p); }
#else
  _LIBCPP_HIDE_FROM_ABI __const_reference operator[](size_t __p) const { return __base::__make_ref(__p); }
#endif
  _LIBCPP_HIDE_FROM_ABI reference operator[](size_t __p) { return __base::__make_ref(__p); }
  _LIBCPP_HIDE_FROM_ABI unsigned long to_ulong() const;
  _LIBCPP_HIDE_FROM_ABI unsigned long long to_ullong() const;
  template <class _CharT, class _Traits, class _Allocator>
  _LIBCPP_HIDE_FROM_ABI basic_string<_CharT, _Traits, _Allocator>
  to_string(_CharT __zero = _CharT('0'), _CharT __one = _CharT('1')) const;
  template <class _CharT, class _Traits>
  _LIBCPP_HIDE_FROM_ABI basic_string<_CharT, _Traits, allocator<_CharT> >
  to_string(_CharT __zero = _CharT('0'), _CharT __one = _CharT('1')) const;
  template <class _CharT>
  _LIBCPP_HIDE_FROM_ABI basic_string<_CharT, char_traits<_CharT>, allocator<_CharT> >
  to_string(_CharT __zero = _CharT('0'), _CharT __one = _CharT('1')) const;
  _LIBCPP_HIDE_FROM_ABI basic_string<char, char_traits<char>, allocator<char> >
  to_string(char __zero = '0', char __one = '1') const;
  _LIBCPP_HIDE_FROM_ABI size_t count() const _NOEXCEPT;
  _LIBCPP_HIDE_FROM_ABI size_t size() const _NOEXCEPT { return _Size; }
  _LIBCPP_HIDE_FROM_ABI bool operator==(const bitset& __rhs) const _NOEXCEPT;
  _LIBCPP_HIDE_FROM_ABI bool operator!=(const bitset& __rhs) const _NOEXCEPT;
  _LIBCPP_HIDE_FROM_ABI bool test(size_t __pos) const;
  _LIBCPP_HIDE_FROM_ABI bool all() const _NOEXCEPT;
  _LIBCPP_HIDE_FROM_ABI bool any() const _NOEXCEPT;
  _LIBCPP_HIDE_FROM_ABI bool none() const _NOEXCEPT { return !any(); }
  _LIBCPP_HIDE_FROM_ABI bitset operator<<(size_t __pos) const _NOEXCEPT;
  _LIBCPP_HIDE_FROM_ABI bitset operator>>(size_t __pos) const _NOEXCEPT;

private:
  template <class _CharT, class _Traits>
  _LIBCPP_HIDE_FROM_ABI void
  __init_from_string_view(basic_string_view<_CharT, _Traits> __str, _CharT __zero, _CharT __one) {
    for (size_t __i = 0; __i < __str.size(); ++__i)
      if (!_Traits::eq(__str[__i], __zero) && !_Traits::eq(__str[__i], __one))
        std::__throw_invalid_argument("bitset string ctor has invalid argument");

    size_t __mp = std::min(__str.size(), _Size);
    size_t __i  = 0;
    for (; __i < __mp; ++__i) {
      _CharT __c   = __str[__mp - 1 - __i];
      (*this)[__i] = _Traits::eq(__c, __one);
    }
    std::fill(__base::__make_iter(__i), __base::__make_iter(_Size), false);
  }

  _LIBCPP_HIDE_FROM_ABI size_t __hash_code() const _NOEXCEPT { return __base::__hash_code(); }

  friend struct hash<bitset>;
};

template <size_t _Size>
inline _LIBCPP_HIDE_FROM_ABI bitset<_Size>& bitset<_Size>::operator&=(const bitset& __rhs) _NOEXCEPT {
  __base::operator&=(__rhs);
  return *this;
}

template <size_t _Size>
inline _LIBCPP_HIDE_FROM_ABI bitset<_Size>& bitset<_Size>::operator|=(const bitset& __rhs) _NOEXCEPT {
  __base::operator|=(__rhs);
  return *this;
}

template <size_t _Size>
inline _LIBCPP_HIDE_FROM_ABI bitset<_Size>& bitset<_Size>::operator^=(const bitset& __rhs) _NOEXCEPT {
  __base::operator^=(__rhs);
  return *this;
}

template <size_t _Size>
_LIBCPP_HIDE_FROM_ABI bitset<_Size>& bitset<_Size>::operator<<=(size_t __pos) _NOEXCEPT {
  __pos = std::min(__pos, _Size);
  std::copy_backward(__base::__make_iter(0), __base::__make_iter(_Size - __pos), __base::__make_iter(_Size));
  std::fill_n(__base::__make_iter(0), __pos, false);
  return *this;
}

template <size_t _Size>
_LIBCPP_HIDE_FROM_ABI bitset<_Size>& bitset<_Size>::operator>>=(size_t __pos) _NOEXCEPT {
  __pos = std::min(__pos, _Size);
  std::copy(__base::__make_iter(__pos), __base::__make_iter(_Size), __base::__make_iter(0));
  std::fill_n(__base::__make_iter(_Size - __pos), __pos, false);
  return *this;
}

template <size_t _Size>
inline _LIBCPP_HIDE_FROM_ABI bitset<_Size>& bitset<_Size>::set() _NOEXCEPT {
  std::fill_n(__base::__make_iter(0), _Size, true);
  return *this;
}

template <size_t _Size>
_LIBCPP_HIDE_FROM_ABI bitset<_Size>& bitset<_Size>::set(size_t __pos, bool __val) {
  if (__pos >= _Size)
    __throw_out_of_range("bitset set argument out of range");

  (*this)[__pos] = __val;
  return *this;
}

template <size_t _Size>
inline _LIBCPP_HIDE_FROM_ABI bitset<_Size>& bitset<_Size>::reset() _NOEXCEPT {
  std::fill_n(__base::__make_iter(0), _Size, false);
  return *this;
}

template <size_t _Size>
_LIBCPP_HIDE_FROM_ABI bitset<_Size>& bitset<_Size>::reset(size_t __pos) {
  if (__pos >= _Size)
    __throw_out_of_range("bitset reset argument out of range");

  (*this)[__pos] = false;
  return *this;
}

template <size_t _Size>
inline _LIBCPP_HIDE_FROM_ABI bitset<_Size> bitset<_Size>::operator~() const _NOEXCEPT {
  bitset __x(*this);
  __x.flip();
  return __x;
}

template <size_t _Size>
inline _LIBCPP_HIDE_FROM_ABI bitset<_Size>& bitset<_Size>::flip() _NOEXCEPT {
  __base::flip();
  return *this;
}

template <size_t _Size>
_LIBCPP_HIDE_FROM_ABI bitset<_Size>& bitset<_Size>::flip(size_t __pos) {
  if (__pos >= _Size)
    __throw_out_of_range("bitset flip argument out of range");

  reference __r = __base::__make_ref(__pos);
  __r           = ~__r;
  return *this;
}

template <size_t _Size>
inline _LIBCPP_HIDE_FROM_ABI unsigned long bitset<_Size>::to_ulong() const {
  return __base::to_ulong();
}

template <size_t _Size>
inline _LIBCPP_HIDE_FROM_ABI unsigned long long bitset<_Size>::to_ullong() const {
  return __base::to_ullong();
}

template <size_t _Size>
template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_HIDE_FROM_ABI basic_string<_CharT, _Traits, _Allocator>
bitset<_Size>::to_string(_CharT __zero, _CharT __one) const {
  basic_string<_CharT, _Traits, _Allocator> __r(_Size, __zero);
  for (size_t __i = 0; __i != _Size; ++__i) {
    if ((*this)[__i])
      __r[_Size - 1 - __i] = __one;
  }
  return __r;
}

template <size_t _Size>
template <class _CharT, class _Traits>
inline _LIBCPP_HIDE_FROM_ABI basic_string<_CharT, _Traits, allocator<_CharT> >
bitset<_Size>::to_string(_CharT __zero, _CharT __one) const {
  return to_string<_CharT, _Traits, allocator<_CharT> >(__zero, __one);
}

template <size_t _Size>
template <class _CharT>
inline _LIBCPP_HIDE_FROM_ABI basic_string<_CharT, char_traits<_CharT>, allocator<_CharT> >
bitset<_Size>::to_string(_CharT __zero, _CharT __one) const {
  return to_string<_CharT, char_traits<_CharT>, allocator<_CharT> >(__zero, __one);
}

template <size_t _Size>
inline _LIBCPP_HIDE_FROM_ABI basic_string<char, char_traits<char>, allocator<char> >
bitset<_Size>::to_string(char __zero, char __one) const {
  return to_string<char, char_traits<char>, allocator<char> >(__zero, __one);
}

template <size_t _Size>
inline _LIBCPP_HIDE_FROM_ABI size_t bitset<_Size>::count() const _NOEXCEPT {
  return static_cast<size_t>(std::count(__base::__make_iter(0), __base::__make_iter(_Size), true));
}

template <size_t _Size>
inline _LIBCPP_HIDE_FROM_ABI bool bitset<_Size>::operator==(const bitset& __rhs) const _NOEXCEPT {
  return std::equal(__base::__make_iter(0), __base::__make_iter(_Size), __rhs.__make_iter(0));
}

template <size_t _Size>
inline _LIBCPP_HIDE_FROM_ABI bool bitset<_Size>::operator!=(const bitset& __rhs) const _NOEXCEPT {
  return !(*this == __rhs);
}

template <size_t _Size>
_LIBCPP_HIDE_FROM_ABI bool bitset<_Size>::test(size_t __pos) const {
  if (__pos >= _Size)
    __throw_out_of_range("bitset test argument out of range");

  return (*this)[__pos];
}

template <size_t _Size>
inline _LIBCPP_HIDE_FROM_ABI bool bitset<_Size>::all() const _NOEXCEPT {
  return __base::all();
}

template <size_t _Size>
inline _LIBCPP_HIDE_FROM_ABI bool bitset<_Size>::any() const _NOEXCEPT {
  return __base::any();
}

template <size_t _Size>
inline _LIBCPP_HIDE_FROM_ABI bitset<_Size> bitset<_Size>::operator<<(size_t __pos) const _NOEXCEPT {
  bitset __r = *this;
  __r <<= __pos;
  return __r;
}

template <size_t _Size>
inline _LIBCPP_HIDE_FROM_ABI bitset<_Size> bitset<_Size>::operator>>(size_t __pos) const _NOEXCEPT {
  bitset __r = *this;
  __r >>= __pos;
  return __r;
}

template <size_t _Size>
inline _LIBCPP_HIDE_FROM_ABI bitset<_Size> operator&(const bitset<_Size>& __x, const bitset<_Size>& __y) _NOEXCEPT {
  bitset<_Size> __r = __x;
  __r &= __y;
  return __r;
}

template <size_t _Size>
inline _LIBCPP_HIDE_FROM_ABI bitset<_Size> operator|(const bitset<_Size>& __x, const bitset<_Size>& __y) _NOEXCEPT {
  bitset<_Size> __r = __x;
  __r |= __y;
  return __r;
}

template <size_t _Size>
inline _LIBCPP_HIDE_FROM_ABI bitset<_Size> operator^(const bitset<_Size>& __x, const bitset<_Size>& __y) _NOEXCEPT {
  bitset<_Size> __r = __x;
  __r ^= __y;
  return __r;
}

template <size_t _Size>
struct _LIBCPP_TEMPLATE_VIS hash<bitset<_Size> > : public __unary_function<bitset<_Size>, size_t> {
  _LIBCPP_HIDE_FROM_ABI size_t operator()(const bitset<_Size>& __bs) const _NOEXCEPT { return __bs.__hash_code(); }
};

template <class _CharT, class _Traits, size_t _Size>
_LIBCPP_HIDE_FROM_ABI basic_istream<_CharT, _Traits>&
operator>>(basic_istream<_CharT, _Traits>& __is, bitset<_Size>& __x);

template <class _CharT, class _Traits, size_t _Size>
_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
operator<<(basic_ostream<_CharT, _Traits>& __os, const bitset<_Size>& __x);

_LIBCPP_END_NAMESPACE_STD

_LIBCPP_POP_MACROS

#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES)
#  include <__cxx03/cstdlib>
#  include <__cxx03/type_traits>
#endif

#endif // _LIBCPP___CXX03_BITSET
