include/vector

// -*- C++ -*-
//===------------------------------ vector --------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP_VECTOR
#define _LIBCPP_VECTOR

/*
 vector synopsis

namespace std
{

template <class T, class Allocator = allocator<T> >
class vector
{
public:
 typedef T value_type;
 typedef Allocator allocator_type;
 typedef typename allocator_type::reference reference;
 typedef typename allocator_type::const_reference const_reference;
 typedef implementation-defined iterator;
 typedef implementation-defined const_iterator;
 typedef typename allocator_type::size_type size_type;
 typedef typename allocator_type::difference_type difference_type;
 typedef typename allocator_type::pointer pointer;
 typedef typename allocator_type::const_pointer const_pointer;
 typedef std::reverse_iterator<iterator> reverse_iterator;
 typedef std::reverse_iterator<const_iterator> const_reverse_iterator;

 vector()
 noexcept(is_nothrow_default_constructible<allocator_type>::value);
 explicit vector(const allocator_type&);
 explicit vector(size_type n);
 explicit vector(size_type n, const allocator_type&); // C++14
 vector(size_type n, const value_type& value, const allocator_type& = allocator_type());
 template <class InputIterator>
 vector(InputIterator first, InputIterator last, const allocator_type& = allocator_type());
 vector(const vector& x);
 vector(vector&& x)
 noexcept(is_nothrow_move_constructible<allocator_type>::value);
 vector(initializer_list<value_type> il);
 vector(initializer_list<value_type> il, const allocator_type& a);
 ~vector();
 vector& operator=(const vector& x);
 vector& operator=(vector&& x)
 noexcept(
 allocator_type::propagate_on_container_move_assignment::value &&
 is_nothrow_move_assignable<allocator_type>::value);
 vector& operator=(initializer_list<value_type> il);
 template <class InputIterator>
 void assign(InputIterator first, InputIterator last);
 void assign(size_type n, const value_type& u);
 void assign(initializer_list<value_type> il);

 allocator_type get_allocator() const noexcept;

 iterator begin() noexcept;
 const_iterator begin() const noexcept;
 iterator end() noexcept;
 const_iterator end() const noexcept;

 reverse_iterator rbegin() noexcept;
 const_reverse_iterator rbegin() const noexcept;
 reverse_iterator rend() noexcept;
 const_reverse_iterator rend() const noexcept;

 const_iterator cbegin() const noexcept;
 const_iterator cend() const noexcept;
 const_reverse_iterator crbegin() const noexcept;
 const_reverse_iterator crend() const noexcept;

 size_type size() const noexcept;
 size_type max_size() const noexcept;
 size_type capacity() const noexcept;
 bool empty() const noexcept;
 void reserve(size_type n);
 void shrink_to_fit() noexcept;

 reference operator[](size_type n);
 const_reference operator[](size_type n) const;
 reference at(size_type n);
 const_reference at(size_type n) const;

 reference front();
 const_reference front() const;
 reference back();
 const_reference back() const;

 value_type* data() noexcept;
 const value_type* data() const noexcept;

 void push_back(const value_type& x);
 void push_back(value_type&& x);
 template <class... Args>
 void emplace_back(Args&&... args);
 void pop_back();

 template <class... Args> iterator emplace(const_iterator position, Args&&... args);
 iterator insert(const_iterator position, const value_type& x);
 iterator insert(const_iterator position, value_type&& x);
 iterator insert(const_iterator position, size_type n, const value_type& x);
 template <class InputIterator>
 iterator insert(const_iterator position, InputIterator first, InputIterator last);
 iterator insert(const_iterator position, initializer_list<value_type> il);

 iterator erase(const_iterator position);
 iterator erase(const_iterator first, const_iterator last);

 void clear() noexcept;

 void resize(size_type sz);
 void resize(size_type sz, const value_type& c);

 void swap(vector&)
 noexcept(allocator_traits<allocator_type>::propagate_on_container_swap::value ||
 allocator_traits<allocator_type>::is_always_equal::value); // C++17

 bool __invariants() const;
};

template <class Allocator = allocator<T> >
class vector<bool, Allocator>
{
public:
 typedef bool value_type;
 typedef Allocator allocator_type;
 typedef implementation-defined iterator;
 typedef implementation-defined const_iterator;
 typedef typename allocator_type::size_type size_type;
 typedef typename allocator_type::difference_type difference_type;
 typedef iterator pointer;
 typedef const_iterator const_pointer;
 typedef std::reverse_iterator<iterator> reverse_iterator;
 typedef std::reverse_iterator<const_iterator> const_reverse_iterator;

 class reference
 {
 public:
 reference(const reference&) noexcept;
 operator bool() const noexcept;
 reference& operator=(const bool x) noexcept;
 reference& operator=(const reference& x) noexcept;
 iterator operator&() const noexcept;
 void flip() noexcept;
 };

 class const_reference
 {
 public:
 const_reference(const reference&) noexcept;
 operator bool() const noexcept;
 const_iterator operator&() const noexcept;
 };

 vector()
 noexcept(is_nothrow_default_constructible<allocator_type>::value);
 explicit vector(const allocator_type&);
 explicit vector(size_type n, const allocator_type& a = allocator_type()); // C++14
 vector(size_type n, const value_type& value, const allocator_type& = allocator_type());
 template <class InputIterator>
 vector(InputIterator first, InputIterator last, const allocator_type& = allocator_type());
 vector(const vector& x);
 vector(vector&& x)
 noexcept(is_nothrow_move_constructible<allocator_type>::value);
 vector(initializer_list<value_type> il);
 vector(initializer_list<value_type> il, const allocator_type& a);
 ~vector();
 vector& operator=(const vector& x);
 vector& operator=(vector&& x)
 noexcept(
 allocator_type::propagate_on_container_move_assignment::value &&
 is_nothrow_move_assignable<allocator_type>::value);
 vector& operator=(initializer_list<value_type> il);
 template <class InputIterator>
 void assign(InputIterator first, InputIterator last);
 void assign(size_type n, const value_type& u);
 void assign(initializer_list<value_type> il);

 allocator_type get_allocator() const noexcept;

 iterator begin() noexcept;
 const_iterator begin() const noexcept;
 iterator end() noexcept;
 const_iterator end() const noexcept;

 reverse_iterator rbegin() noexcept;
 const_reverse_iterator rbegin() const noexcept;
 reverse_iterator rend() noexcept;
 const_reverse_iterator rend() const noexcept;

 const_iterator cbegin() const noexcept;
 const_iterator cend() const noexcept;
 const_reverse_iterator crbegin() const noexcept;
 const_reverse_iterator crend() const noexcept;

 size_type size() const noexcept;
 size_type max_size() const noexcept;
 size_type capacity() const noexcept;
 bool empty() const noexcept;
 void reserve(size_type n);
 void shrink_to_fit() noexcept;

 reference operator[](size_type n);
 const_reference operator[](size_type n) const;
 reference at(size_type n);
 const_reference at(size_type n) const;

 reference front();
 const_reference front() const;
 reference back();
 const_reference back() const;

 void push_back(const value_type& x);
 template <class... Args> void emplace_back(Args&&... args); // C++14
 void pop_back();

 template <class... Args> iterator emplace(const_iterator position, Args&&... args); // C++14
 iterator insert(const_iterator position, const value_type& x);
 iterator insert(const_iterator position, size_type n, const value_type& x);
 template <class InputIterator>
 iterator insert(const_iterator position, InputIterator first, InputIterator last);
 iterator insert(const_iterator position, initializer_list<value_type> il);

 iterator erase(const_iterator position);
 iterator erase(const_iterator first, const_iterator last);

 void clear() noexcept;

 void resize(size_type sz);
 void resize(size_type sz, value_type x);

 void swap(vector&)
 noexcept(allocator_traits<allocator_type>::propagate_on_container_swap::value ||
 allocator_traits<allocator_type>::is_always_equal::value); // C++17
 void flip() noexcept;

 bool __invariants() const;
};

template <class Allocator> struct hash<std::vector<bool, Allocator>>;

template <class T, class Allocator> bool operator==(const vector<T,Allocator>& x, const vector<T,Allocator>& y);
template <class T, class Allocator> bool operator< (const vector<T,Allocator>& x, const vector<T,Allocator>& y);
template <class T, class Allocator> bool operator!=(const vector<T,Allocator>& x, const vector<T,Allocator>& y);
template <class T, class Allocator> bool operator> (const vector<T,Allocator>& x, const vector<T,Allocator>& y);
template <class T, class Allocator> bool operator>=(const vector<T,Allocator>& x, const vector<T,Allocator>& y);
template <class T, class Allocator> bool operator<=(const vector<T,Allocator>& x, const vector<T,Allocator>& y);

template <class T, class Allocator>
void swap(vector<T,Allocator>& x, vector<T,Allocator>& y)
 noexcept(noexcept(x.swap(y)));

} // std

*/

#include <__config>
#include <__bit_reference>
#include <type_traits>
#include <climits>
#include <limits>
#include <initializer_list>
#include <memory>
#include <stdexcept>
#include <algorithm>
#include <cstring>
#include <__split_buffer>
#include <__functional_base>

#include <__undef_min_max>

#include <__debug>

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

_LIBCPP_BEGIN_NAMESPACE_STD

template <bool>
class __vector_base_common
{
protected:
 _LIBCPP_ALWAYS_INLINE __vector_base_common() {}
 void __throw_length_error() const;
 void __throw_out_of_range() const;
};

template <bool __b>
void
__vector_base_common<__b>::__throw_length_error() const
{
#ifndef _LIBCPP_NO_EXCEPTIONS
 throw length_error("vector");
#else
 assert(!"vector length_error");
#endif
}

template <bool __b>
void
__vector_base_common<__b>::__throw_out_of_range() const
{
#ifndef _LIBCPP_NO_EXCEPTIONS
 throw out_of_range("vector");
#else
 assert(!"vector out_of_range");
#endif
}

#ifdef _LIBCPP_MSVC
#pragma warning( push )
#pragma warning( disable: 4231 )
#endif // _LIBCPP_MSVC
_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_TYPE_VIS __vector_base_common<true>)
#ifdef _LIBCPP_MSVC
#pragma warning( pop )
#endif // _LIBCPP_MSVC

template <class _Tp, class _Allocator>
class __vector_base
 : protected __vector_base_common<true>
{
protected:
 typedef _Tp value_type;
 typedef _Allocator allocator_type;
 typedef allocator_traits<allocator_type> __alloc_traits;
 typedef value_type& reference;
 typedef const value_type& const_reference;
 typedef typename __alloc_traits::size_type size_type;
 typedef typename __alloc_traits::difference_type difference_type;
 typedef typename __alloc_traits::pointer pointer;
 typedef typename __alloc_traits::const_pointer const_pointer;
 typedef pointer iterator;
 typedef const_pointer const_iterator;

 pointer __begin_;
 pointer __end_;
 __compressed_pair<pointer, allocator_type> __end_cap_;

 _LIBCPP_INLINE_VISIBILITY
 allocator_type& __alloc() _NOEXCEPT
 {return __end_cap_.second();}
 _LIBCPP_INLINE_VISIBILITY
 const allocator_type& __alloc() const _NOEXCEPT
 {return __end_cap_.second();}
 _LIBCPP_INLINE_VISIBILITY
 pointer& __end_cap() _NOEXCEPT
 {return __end_cap_.first();}
 _LIBCPP_INLINE_VISIBILITY
 const pointer& __end_cap() const _NOEXCEPT
 {return __end_cap_.first();}

 _LIBCPP_INLINE_VISIBILITY
 __vector_base()
 _NOEXCEPT_(is_nothrow_default_constructible<allocator_type>::value);
 _LIBCPP_INLINE_VISIBILITY __vector_base(const allocator_type& __a);
 ~__vector_base();

 _LIBCPP_INLINE_VISIBILITY
 void clear() _NOEXCEPT {__destruct_at_end(__begin_);}
 _LIBCPP_INLINE_VISIBILITY
 size_type capacity() const _NOEXCEPT
 {return static_cast<size_type>(__end_cap() - __begin_);}

 _LIBCPP_INLINE_VISIBILITY
 void __destruct_at_end(pointer __new_last) _NOEXCEPT;

 _LIBCPP_INLINE_VISIBILITY
 void __copy_assign_alloc(const __vector_base& __c)
 {__copy_assign_alloc(__c, integral_constant<bool,
 __alloc_traits::propagate_on_container_copy_assignment::value>());}

 _LIBCPP_INLINE_VISIBILITY
 void __move_assign_alloc(__vector_base& __c)
 _NOEXCEPT_(
 !__alloc_traits::propagate_on_container_move_assignment::value ||
 is_nothrow_move_assignable<allocator_type>::value)
 {__move_assign_alloc(__c, integral_constant<bool,
 __alloc_traits::propagate_on_container_move_assignment::value>());}
private:
 _LIBCPP_INLINE_VISIBILITY
 void __copy_assign_alloc(const __vector_base& __c, true_type)
 {
 if (__alloc() != __c.__alloc())
 {
 clear();
 __alloc_traits::deallocate(__alloc(), __begin_, capacity());
 __begin_ = __end_ = __end_cap() = nullptr;
 }
 __alloc() = __c.__alloc();
 }

 _LIBCPP_INLINE_VISIBILITY
 void __copy_assign_alloc(const __vector_base&, false_type)
 {}

 _LIBCPP_INLINE_VISIBILITY
 void __move_assign_alloc(__vector_base& __c, true_type)
 _NOEXCEPT_(is_nothrow_move_assignable<allocator_type>::value)
 {
 __alloc() = _VSTD::move(__c.__alloc());
 }

 _LIBCPP_INLINE_VISIBILITY
 void __move_assign_alloc(__vector_base&, false_type)
 _NOEXCEPT
 {}
};

template <class _Tp, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
void
__vector_base<_Tp, _Allocator>::__destruct_at_end(pointer __new_last) _NOEXCEPT
{
 while (__new_last != __end_)
 __alloc_traits::destroy(__alloc(), _VSTD::__to_raw_pointer(--__end_));
}

template <class _Tp, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
__vector_base<_Tp, _Allocator>::__vector_base()
 _NOEXCEPT_(is_nothrow_default_constructible<allocator_type>::value)
 : __begin_(nullptr),
 __end_(nullptr),
 __end_cap_(nullptr)
{
}

template <class _Tp, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
__vector_base<_Tp, _Allocator>::__vector_base(const allocator_type& __a)
 : __begin_(nullptr),
 __end_(nullptr),
 __end_cap_(nullptr, __a)
{
}

template <class _Tp, class _Allocator>
__vector_base<_Tp, _Allocator>::~__vector_base()
{
 if (__begin_ != nullptr)
 {
 clear();
 __alloc_traits::deallocate(__alloc(), __begin_, capacity());
 }
}

template <class _Tp, class _Allocator = allocator<_Tp> >
class _LIBCPP_TYPE_VIS_ONLY vector
 : private __vector_base<_Tp, _Allocator>
{
private:
 typedef __vector_base<_Tp, _Allocator> __base;
 typedef allocator<_Tp> __default_allocator_type;
public:
 typedef vector __self;
 typedef _Tp value_type;
 typedef _Allocator allocator_type;
 typedef typename __base::__alloc_traits __alloc_traits;
 typedef typename __base::reference reference;
 typedef typename __base::const_reference const_reference;
 typedef typename __base::size_type size_type;
 typedef typename __base::difference_type difference_type;
 typedef typename __base::pointer pointer;
 typedef typename __base::const_pointer const_pointer;
 typedef __wrap_iter<pointer> iterator;
 typedef __wrap_iter<const_pointer> const_iterator;
 typedef _VSTD::reverse_iterator<iterator> reverse_iterator;
 typedef _VSTD::reverse_iterator<const_iterator> const_reverse_iterator;

 static_assert((is_same<typename allocator_type::value_type, value_type>::value),
 "Allocator::value_type must be same type as value_type");

 _LIBCPP_INLINE_VISIBILITY
 vector() _NOEXCEPT_(is_nothrow_default_constructible<allocator_type>::value)
 {
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
#endif
 }
 _LIBCPP_INLINE_VISIBILITY explicit vector(const allocator_type& __a)
#if _LIBCPP_STD_VER <= 14
 _NOEXCEPT_(is_nothrow_copy_constructible<allocator_type>::value)
#else
 _NOEXCEPT
#endif
 : __base(__a)
 {
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
#endif
 }
 explicit vector(size_type __n);
#if _LIBCPP_STD_VER > 11
 explicit vector(size_type __n, const allocator_type& __a);
#endif
 vector(size_type __n, const_reference __x);
 vector(size_type __n, const_reference __x, const allocator_type& __a);
 template <class _InputIterator>
 vector(_InputIterator __first,
 typename enable_if<__is_input_iterator <_InputIterator>::value &&
 !__is_forward_iterator<_InputIterator>::value &&
 is_constructible<
 value_type,
 typename iterator_traits<_InputIterator>::reference>::value,
 _InputIterator>::type __last);
 template <class _InputIterator>
 vector(_InputIterator __first, _InputIterator __last, const allocator_type& __a,
 typename enable_if<__is_input_iterator <_InputIterator>::value &&
 !__is_forward_iterator<_InputIterator>::value &&
 is_constructible<
 value_type,
 typename iterator_traits<_InputIterator>::reference>::value>::type* = 0);
 template <class _ForwardIterator>
 vector(_ForwardIterator __first,
 typename enable_if<__is_forward_iterator<_ForwardIterator>::value &&
 is_constructible<
 value_type,
 typename iterator_traits<_ForwardIterator>::reference>::value,
 _ForwardIterator>::type __last);
 template <class _ForwardIterator>
 vector(_ForwardIterator __first, _ForwardIterator __last, const allocator_type& __a,
 typename enable_if<__is_forward_iterator<_ForwardIterator>::value &&
 is_constructible<
 value_type,
 typename iterator_traits<_ForwardIterator>::reference>::value>::type* = 0);
#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
 _LIBCPP_INLINE_VISIBILITY
 vector(initializer_list<value_type> __il);
 _LIBCPP_INLINE_VISIBILITY
 vector(initializer_list<value_type> __il, const allocator_type& __a);
#endif // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
#if _LIBCPP_DEBUG_LEVEL >= 2
 _LIBCPP_INLINE_VISIBILITY
 ~vector()
 {
 __get_db()->__erase_c(this);
 }
#endif

 vector(const vector& __x);
 vector(const vector& __x, const allocator_type& __a);
 _LIBCPP_INLINE_VISIBILITY
 vector& operator=(const vector& __x);
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
 _LIBCPP_INLINE_VISIBILITY
 vector(vector&& __x)
 _NOEXCEPT_(is_nothrow_move_constructible<allocator_type>::value);
 _LIBCPP_INLINE_VISIBILITY
 vector(vector&& __x, const allocator_type& __a);
 _LIBCPP_INLINE_VISIBILITY
 vector& operator=(vector&& __x)
 _NOEXCEPT_(
 __alloc_traits::propagate_on_container_move_assignment::value &&
 is_nothrow_move_assignable<allocator_type>::value);
#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
 _LIBCPP_INLINE_VISIBILITY
 vector& operator=(initializer_list<value_type> __il)
 {assign(__il.begin(), __il.end()); return *this;}
#endif // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

 template <class _InputIterator>
 typename enable_if
 <
 __is_input_iterator <_InputIterator>::value &&
 !__is_forward_iterator<_InputIterator>::value &&
 is_constructible<
 value_type,
 typename iterator_traits<_InputIterator>::reference>::value,
 void
 >::type
 assign(_InputIterator __first, _InputIterator __last);
 template <class _ForwardIterator>
 typename enable_if
 <
 __is_forward_iterator<_ForwardIterator>::value &&
 is_constructible<
 value_type,
 typename iterator_traits<_ForwardIterator>::reference>::value,
 void
 >::type
 assign(_ForwardIterator __first, _ForwardIterator __last);

 void assign(size_type __n, const_reference __u);
#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
 _LIBCPP_INLINE_VISIBILITY
 void assign(initializer_list<value_type> __il)
 {assign(__il.begin(), __il.end());}
#endif // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

 _LIBCPP_INLINE_VISIBILITY
 allocator_type get_allocator() const _NOEXCEPT
 {return this->__alloc();}

 _LIBCPP_INLINE_VISIBILITY iterator begin() _NOEXCEPT;
 _LIBCPP_INLINE_VISIBILITY const_iterator begin() const _NOEXCEPT;
 _LIBCPP_INLINE_VISIBILITY iterator end() _NOEXCEPT;
 _LIBCPP_INLINE_VISIBILITY const_iterator end() const _NOEXCEPT;

 _LIBCPP_INLINE_VISIBILITY
 reverse_iterator rbegin() _NOEXCEPT
 {return reverse_iterator(end());}
 _LIBCPP_INLINE_VISIBILITY
 const_reverse_iterator rbegin() const _NOEXCEPT
 {return const_reverse_iterator(end());}
 _LIBCPP_INLINE_VISIBILITY
 reverse_iterator rend() _NOEXCEPT
 {return reverse_iterator(begin());}
 _LIBCPP_INLINE_VISIBILITY
 const_reverse_iterator rend() const _NOEXCEPT
 {return const_reverse_iterator(begin());}

 _LIBCPP_INLINE_VISIBILITY
 const_iterator cbegin() const _NOEXCEPT
 {return begin();}
 _LIBCPP_INLINE_VISIBILITY
 const_iterator cend() const _NOEXCEPT
 {return end();}
 _LIBCPP_INLINE_VISIBILITY
 const_reverse_iterator crbegin() const _NOEXCEPT
 {return rbegin();}
 _LIBCPP_INLINE_VISIBILITY
 const_reverse_iterator crend() const _NOEXCEPT
 {return rend();}

 _LIBCPP_INLINE_VISIBILITY
 size_type size() const _NOEXCEPT
 {return static_cast<size_type>(this->__end_ - this->__begin_);}
 _LIBCPP_INLINE_VISIBILITY
 size_type capacity() const _NOEXCEPT
 {return __base::capacity();}
 _LIBCPP_INLINE_VISIBILITY
 bool empty() const _NOEXCEPT
 {return this->__begin_ == this->__end_;}
 size_type max_size() const _NOEXCEPT;
 void reserve(size_type __n);
 void shrink_to_fit() _NOEXCEPT;

 _LIBCPP_INLINE_VISIBILITY reference operator[](size_type __n);
 _LIBCPP_INLINE_VISIBILITY const_reference operator[](size_type __n) const;
 reference at(size_type __n);
 const_reference at(size_type __n) const;

 _LIBCPP_INLINE_VISIBILITY reference front()
 {
 _LIBCPP_ASSERT(!empty(), "front() called for empty vector");
 return *this->__begin_;
 }
 _LIBCPP_INLINE_VISIBILITY const_reference front() const
 {
 _LIBCPP_ASSERT(!empty(), "front() called for empty vector");
 return *this->__begin_;
 }
 _LIBCPP_INLINE_VISIBILITY reference back()
 {
 _LIBCPP_ASSERT(!empty(), "back() called for empty vector");
 return *(this->__end_ - 1);
 }
 _LIBCPP_INLINE_VISIBILITY const_reference back() const
 {
 _LIBCPP_ASSERT(!empty(), "back() called for empty vector");
 return *(this->__end_ - 1);
 }

 _LIBCPP_INLINE_VISIBILITY
 value_type* data() _NOEXCEPT
 {return _VSTD::__to_raw_pointer(this->__begin_);}
 _LIBCPP_INLINE_VISIBILITY
 const value_type* data() const _NOEXCEPT
 {return _VSTD::__to_raw_pointer(this->__begin_);}

 _LIBCPP_INLINE_VISIBILITY void push_back(const_reference __x);
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
 _LIBCPP_INLINE_VISIBILITY void push_back(value_type&& __x);
#ifndef _LIBCPP_HAS_NO_VARIADICS
 template <class... _Args>
 void emplace_back(_Args&&... __args);
#endif // _LIBCPP_HAS_NO_VARIADICS
#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
 void pop_back();

 iterator insert(const_iterator __position, const_reference __x);
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
 iterator insert(const_iterator __position, value_type&& __x);
#ifndef _LIBCPP_HAS_NO_VARIADICS
 template <class... _Args>
 iterator emplace(const_iterator __position, _Args&&... __args);
#endif // _LIBCPP_HAS_NO_VARIADICS
#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
 iterator insert(const_iterator __position, size_type __n, const_reference __x);
 template <class _InputIterator>
 typename enable_if
 <
 __is_input_iterator <_InputIterator>::value &&
 !__is_forward_iterator<_InputIterator>::value &&
 is_constructible<
 value_type,
 typename iterator_traits<_InputIterator>::reference>::value,
 iterator
 >::type
 insert(const_iterator __position, _InputIterator __first, _InputIterator __last);
 template <class _ForwardIterator>
 typename enable_if
 <
 __is_forward_iterator<_ForwardIterator>::value &&
 is_constructible<
 value_type,
 typename iterator_traits<_ForwardIterator>::reference>::value,
 iterator
 >::type
 insert(const_iterator __position, _ForwardIterator __first, _ForwardIterator __last);
#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
 _LIBCPP_INLINE_VISIBILITY
 iterator insert(const_iterator __position, initializer_list<value_type> __il)
 {return insert(__position, __il.begin(), __il.end());}
#endif // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

 _LIBCPP_INLINE_VISIBILITY iterator erase(const_iterator __position);
 iterator erase(const_iterator __first, const_iterator __last);

 _LIBCPP_INLINE_VISIBILITY
 void clear() _NOEXCEPT
 {
 size_type __old_size = size();
 __base::clear();
 __annotate_shrink(__old_size);
 __invalidate_all_iterators();
 }

 void resize(size_type __sz);
 void resize(size_type __sz, const_reference __x);

 void swap(vector&)
#if _LIBCPP_STD_VER >= 14
 _NOEXCEPT;
#else
 _NOEXCEPT_(!__alloc_traits::propagate_on_container_swap::value || 
 __is_nothrow_swappable<allocator_type>::value);
#endif

 bool __invariants() const;

#if _LIBCPP_DEBUG_LEVEL >= 2

 bool __dereferenceable(const const_iterator* __i) const;
 bool __decrementable(const const_iterator* __i) const;
 bool __addable(const const_iterator* __i, ptrdiff_t __n) const;
 bool __subscriptable(const const_iterator* __i, ptrdiff_t __n) const;

#endif // _LIBCPP_DEBUG_LEVEL >= 2

private:
 _LIBCPP_INLINE_VISIBILITY void __invalidate_all_iterators();
 void allocate(size_type __n);
 void deallocate() _NOEXCEPT;
 _LIBCPP_INLINE_VISIBILITY size_type __recommend(size_type __new_size) const;
 void __construct_at_end(size_type __n);
 void __construct_at_end(size_type __n, const_reference __x);
 template <class _ForwardIterator>
 typename enable_if
 <
 __is_forward_iterator<_ForwardIterator>::value,
 void
 >::type
 __construct_at_end(_ForwardIterator __first, _ForwardIterator __last, size_type __n);
 void __append(size_type __n);
 void __append(size_type __n, const_reference __x);
 _LIBCPP_INLINE_VISIBILITY
 iterator __make_iter(pointer __p) _NOEXCEPT;
 _LIBCPP_INLINE_VISIBILITY
 const_iterator __make_iter(const_pointer __p) const _NOEXCEPT;
 void __swap_out_circular_buffer(__split_buffer<value_type, allocator_type&>& __v);
 pointer __swap_out_circular_buffer(__split_buffer<value_type, allocator_type&>& __v, pointer __p);
 void __move_range(pointer __from_s, pointer __from_e, pointer __to);
 void __move_assign(vector& __c, true_type)
 _NOEXCEPT_(is_nothrow_move_assignable<allocator_type>::value);
 void __move_assign(vector& __c, false_type);
 _LIBCPP_INLINE_VISIBILITY
 void __destruct_at_end(pointer __new_last) _NOEXCEPT
 {
#if _LIBCPP_DEBUG_LEVEL >= 2
 __c_node* __c = __get_db()->__find_c_and_lock(this);
 for (__i_node** __p = __c->end_; __p != __c->beg_; )
 {
 --__p;
 const_iterator* __i = static_cast<const_iterator*>((*__p)->__i_);
 if (__i->base() > __new_last)
 {
 (*__p)->__c_ = nullptr;
 if (--__c->end_ != __p)
 memmove(__p, __p+1, (__c->end_ - __p)*sizeof(__i_node*));
 }
 }
 __get_db()->unlock();
#endif
 size_type __old_size = size();
 __base::__destruct_at_end(__new_last);
 __annotate_shrink(__old_size);
 }
 template <class _Up>
 void
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
 __push_back_slow_path(_Up&& __x);
#else
 __push_back_slow_path(_Up& __x);
#endif
#if !defined(_LIBCPP_HAS_NO_VARIADICS) && !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES)
 template <class... _Args>
 void
 __emplace_back_slow_path(_Args&&... __args);
#endif
 // The following functions are no-ops outside of AddressSanitizer mode.
 // We call annotatations only for the default Allocator because other allocators
 // may not meet the AddressSanitizer alignment constraints.
 // See the documentation for __sanitizer_annotate_contiguous_container for more details.
 void __annotate_contiguous_container
 (const void *__beg, const void *__end, const void *__old_mid, const void *__new_mid) const
 {
#ifndef _LIBCPP_HAS_NO_ASAN
 if (__beg && is_same<allocator_type, __default_allocator_type>::value)
 __sanitizer_annotate_contiguous_container(__beg, __end, __old_mid, __new_mid);
#endif
 }

 void __annotate_new(size_type __current_size) const
 {
 __annotate_contiguous_container(data(), data() + capacity(),
 data() + capacity(), data() + __current_size);
 }
 void __annotate_delete() const
 {
 __annotate_contiguous_container(data(), data() + capacity(),
 data() + size(), data() + capacity());
 }
 void __annotate_increase(size_type __n) const
 {
 __annotate_contiguous_container(data(), data() + capacity(),
 data() + size(), data() + size() + __n);
 }
 void __annotate_shrink(size_type __old_size) const
 {
 __annotate_contiguous_container(data(), data() + capacity(),
 data() + __old_size, data() + size());
 }
#ifndef _LIBCPP_HAS_NO_ASAN
 // The annotation for size increase should happen before the actual increase,
 // but if an exception is thrown after that the annotation has to be undone.
 struct __RAII_IncreaseAnnotator {
 __RAII_IncreaseAnnotator(const vector &__v, size_type __n = 1)
 : __commit(false), __v(__v), __old_size(__v.size() + __n) {
 __v.__annotate_increase(__n);
 }
 void __done() { __commit = true; }
 ~__RAII_IncreaseAnnotator() {
 if (__commit) return;
 __v.__annotate_shrink(__old_size);
 }
 bool __commit;
 const vector &__v;
 size_type __old_size;
 };
#else
 struct __RAII_IncreaseAnnotator {
 inline __RAII_IncreaseAnnotator(const vector &, size_type __n = 1) {}
 inline void __done() {}
 };
#endif

};

template <class _Tp, class _Allocator>
void
vector<_Tp, _Allocator>::__swap_out_circular_buffer(__split_buffer<value_type, allocator_type&>& __v)
{
 __annotate_delete();
 __alloc_traits::__construct_backward(this->__alloc(), this->__begin_, this->__end_, __v.__begin_);
 _VSTD::swap(this->__begin_, __v.__begin_);
 _VSTD::swap(this->__end_, __v.__end_);
 _VSTD::swap(this->__end_cap(), __v.__end_cap());
 __v.__first_ = __v.__begin_;
 __annotate_new(size());
 __invalidate_all_iterators();
}

template <class _Tp, class _Allocator>
typename vector<_Tp, _Allocator>::pointer
vector<_Tp, _Allocator>::__swap_out_circular_buffer(__split_buffer<value_type, allocator_type&>& __v, pointer __p)
{
 __annotate_delete();
 pointer __r = __v.__begin_;
 __alloc_traits::__construct_backward(this->__alloc(), this->__begin_, __p, __v.__begin_);
 __alloc_traits::__construct_forward(this->__alloc(), __p, this->__end_, __v.__end_);
 _VSTD::swap(this->__begin_, __v.__begin_);
 _VSTD::swap(this->__end_, __v.__end_);
 _VSTD::swap(this->__end_cap(), __v.__end_cap());
 __v.__first_ = __v.__begin_;
 __annotate_new(size());
 __invalidate_all_iterators();
 return __r;
}

// Allocate space for __n objects
// throws length_error if __n > max_size()
// throws (probably bad_alloc) if memory run out
// Precondition: __begin_ == __end_ == __end_cap() == 0
// Precondition: __n > 0
// Postcondition: capacity() == __n
// Postcondition: size() == 0
template <class _Tp, class _Allocator>
void
vector<_Tp, _Allocator>::allocate(size_type __n)
{
 if (__n > max_size())
 this->__throw_length_error();
 this->__begin_ = this->__end_ = __alloc_traits::allocate(this->__alloc(), __n);
 this->__end_cap() = this->__begin_ + __n;
 __annotate_new(0);
}

template <class _Tp, class _Allocator>
void
vector<_Tp, _Allocator>::deallocate() _NOEXCEPT
{
 if (this->__begin_ != nullptr)
 {
 clear();
 __alloc_traits::deallocate(this->__alloc(), this->__begin_, capacity());
 this->__begin_ = this->__end_ = this->__end_cap() = nullptr;
 }
}

template <class _Tp, class _Allocator>
typename vector<_Tp, _Allocator>::size_type
vector<_Tp, _Allocator>::max_size() const _NOEXCEPT
{
 return _VSTD::min<size_type>(__alloc_traits::max_size(this->__alloc()), numeric_limits<size_type>::max() / 2); // end() >= begin(), always
}

// Precondition: __new_size > capacity()
template <class _Tp, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
typename vector<_Tp, _Allocator>::size_type
vector<_Tp, _Allocator>::__recommend(size_type __new_size) const
{
 const size_type __ms = max_size();
 if (__new_size > __ms)
 this->__throw_length_error();
 const size_type __cap = capacity();
 if (__cap >= __ms / 2)
 return __ms;
 return _VSTD::max<size_type>(2*__cap, __new_size);
}

// Default constructs __n objects starting at __end_
// throws if construction throws
// Precondition: __n > 0
// Precondition: size() + __n <= capacity()
// Postcondition: size() == size() + __n
template <class _Tp, class _Allocator>
void
vector<_Tp, _Allocator>::__construct_at_end(size_type __n)
{
 allocator_type& __a = this->__alloc();
 do
 {
 __RAII_IncreaseAnnotator __annotator(*this);
 __alloc_traits::construct(__a, _VSTD::__to_raw_pointer(this->__end_));
 ++this->__end_;
 --__n;
 __annotator.__done();
 } while (__n > 0);
}

// Copy constructs __n objects starting at __end_ from __x
// throws if construction throws
// Precondition: __n > 0
// Precondition: size() + __n <= capacity()
// Postcondition: size() == old size() + __n
// Postcondition: [i] == __x for all i in [size() - __n, __n)
template <class _Tp, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
void
vector<_Tp, _Allocator>::__construct_at_end(size_type __n, const_reference __x)
{
 allocator_type& __a = this->__alloc();
 do
 {
 __RAII_IncreaseAnnotator __annotator(*this);
 __alloc_traits::construct(__a, _VSTD::__to_raw_pointer(this->__end_), __x);
 ++this->__end_;
 --__n;
 __annotator.__done();
 } while (__n > 0);
}

template <class _Tp, class _Allocator>
template <class _ForwardIterator>
typename enable_if
<
 __is_forward_iterator<_ForwardIterator>::value,
 void
>::type
vector<_Tp, _Allocator>::__construct_at_end(_ForwardIterator __first, _ForwardIterator __last, size_type __n)
{
 allocator_type& __a = this->__alloc();
 __RAII_IncreaseAnnotator __annotator(*this, __n);
 __alloc_traits::__construct_range_forward(__a, __first, __last, this->__end_);
 __annotator.__done();
}

// Default constructs __n objects starting at __end_
// throws if construction throws
// Postcondition: size() == size() + __n
// Exception safety: strong.
template <class _Tp, class _Allocator>
void
vector<_Tp, _Allocator>::__append(size_type __n)
{
 if (static_cast<size_type>(this->__end_cap() - this->__end_) >= __n)
 this->__construct_at_end(__n);
 else
 {
 allocator_type& __a = this->__alloc();
 __split_buffer<value_type, allocator_type&> __v(__recommend(size() + __n), size(), __a);
 __v.__construct_at_end(__n);
 __swap_out_circular_buffer(__v);
 }
}

// Default constructs __n objects starting at __end_
// throws if construction throws
// Postcondition: size() == size() + __n
// Exception safety: strong.
template <class _Tp, class _Allocator>
void
vector<_Tp, _Allocator>::__append(size_type __n, const_reference __x)
{
 if (static_cast<size_type>(this->__end_cap() - this->__end_) >= __n)
 this->__construct_at_end(__n, __x);
 else
 {
 allocator_type& __a = this->__alloc();
 __split_buffer<value_type, allocator_type&> __v(__recommend(size() + __n), size(), __a);
 __v.__construct_at_end(__n, __x);
 __swap_out_circular_buffer(__v);
 }
}

template <class _Tp, class _Allocator>
vector<_Tp, _Allocator>::vector(size_type __n)
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
#endif
 if (__n > 0)
 {
 allocate(__n);
 __construct_at_end(__n);
 }
}

#if _LIBCPP_STD_VER > 11
template <class _Tp, class _Allocator>
vector<_Tp, _Allocator>::vector(size_type __n, const allocator_type& __a)
 : __base(__a)
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
#endif
 if (__n > 0)
 {
 allocate(__n);
 __construct_at_end(__n);
 }
}
#endif

template <class _Tp, class _Allocator>
vector<_Tp, _Allocator>::vector(size_type __n, const_reference __x)
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
#endif
 if (__n > 0)
 {
 allocate(__n);
 __construct_at_end(__n, __x);
 }
}

template <class _Tp, class _Allocator>
vector<_Tp, _Allocator>::vector(size_type __n, const_reference __x, const allocator_type& __a)
 : __base(__a)
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
#endif
 if (__n > 0)
 {
 allocate(__n);
 __construct_at_end(__n, __x);
 }
}

template <class _Tp, class _Allocator>
template <class _InputIterator>
vector<_Tp, _Allocator>::vector(_InputIterator __first,
 typename enable_if<__is_input_iterator <_InputIterator>::value &&
 !__is_forward_iterator<_InputIterator>::value &&
 is_constructible<
 value_type,
 typename iterator_traits<_InputIterator>::reference>::value,
 _InputIterator>::type __last)
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
#endif
 for (; __first != __last; ++__first)
 push_back(*__first);
}

template <class _Tp, class _Allocator>
template <class _InputIterator>
vector<_Tp, _Allocator>::vector(_InputIterator __first, _InputIterator __last, const allocator_type& __a,
 typename enable_if<__is_input_iterator <_InputIterator>::value &&
 !__is_forward_iterator<_InputIterator>::value &&
 is_constructible<
 value_type,
 typename iterator_traits<_InputIterator>::reference>::value>::type*)
 : __base(__a)
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
#endif
 for (; __first != __last; ++__first)
 push_back(*__first);
}

template <class _Tp, class _Allocator>
template <class _ForwardIterator>
vector<_Tp, _Allocator>::vector(_ForwardIterator __first,
 typename enable_if<__is_forward_iterator<_ForwardIterator>::value &&
 is_constructible<
 value_type,
 typename iterator_traits<_ForwardIterator>::reference>::value,
 _ForwardIterator>::type __last)
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
#endif
 size_type __n = static_cast<size_type>(_VSTD::distance(__first, __last));
 if (__n > 0)
 {
 allocate(__n);
 __construct_at_end(__first, __last, __n);
 }
}

template <class _Tp, class _Allocator>
template <class _ForwardIterator>
vector<_Tp, _Allocator>::vector(_ForwardIterator __first, _ForwardIterator __last, const allocator_type& __a,
 typename enable_if<__is_forward_iterator<_ForwardIterator>::value &&
 is_constructible<
 value_type,
 typename iterator_traits<_ForwardIterator>::reference>::value>::type*)
 : __base(__a)
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
#endif
 size_type __n = static_cast<size_type>(_VSTD::distance(__first, __last));
 if (__n > 0)
 {
 allocate(__n);
 __construct_at_end(__first, __last, __n);
 }
}

template <class _Tp, class _Allocator>
vector<_Tp, _Allocator>::vector(const vector& __x)
 : __base(__alloc_traits::select_on_container_copy_construction(__x.__alloc()))
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
#endif
 size_type __n = __x.size();
 if (__n > 0)
 {
 allocate(__n);
 __construct_at_end(__x.__begin_, __x.__end_, __n);
 }
}

template <class _Tp, class _Allocator>
vector<_Tp, _Allocator>::vector(const vector& __x, const allocator_type& __a)
 : __base(__a)
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
#endif
 size_type __n = __x.size();
 if (__n > 0)
 {
 allocate(__n);
 __construct_at_end(__x.__begin_, __x.__end_, __n);
 }
}

#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES

template <class _Tp, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
vector<_Tp, _Allocator>::vector(vector&& __x)
 _NOEXCEPT_(is_nothrow_move_constructible<allocator_type>::value)
 : __base(_VSTD::move(__x.__alloc()))
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
 __get_db()->swap(this, &__x);
#endif
 this->__begin_ = __x.__begin_;
 this->__end_ = __x.__end_;
 this->__end_cap() = __x.__end_cap();
 __x.__begin_ = __x.__end_ = __x.__end_cap() = nullptr;
}

template <class _Tp, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
vector<_Tp, _Allocator>::vector(vector&& __x, const allocator_type& __a)
 : __base(__a)
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
#endif
 if (__a == __x.__alloc())
 {
 this->__begin_ = __x.__begin_;
 this->__end_ = __x.__end_;
 this->__end_cap() = __x.__end_cap();
 __x.__begin_ = __x.__end_ = __x.__end_cap() = nullptr;
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->swap(this, &__x);
#endif
 }
 else
 {
 typedef move_iterator<iterator> _Ip;
 assign(_Ip(__x.begin()), _Ip(__x.end()));
 }
}

#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

template <class _Tp, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
vector<_Tp, _Allocator>::vector(initializer_list<value_type> __il)
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
#endif
 if (__il.size() > 0)
 {
 allocate(__il.size());
 __construct_at_end(__il.begin(), __il.end(), __il.size());
 }
}

template <class _Tp, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
vector<_Tp, _Allocator>::vector(initializer_list<value_type> __il, const allocator_type& __a)
 : __base(__a)
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
#endif
 if (__il.size() > 0)
 {
 allocate(__il.size());
 __construct_at_end(__il.begin(), __il.end(), __il.size());
 }
}

#endif // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

template <class _Tp, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
vector<_Tp, _Allocator>&
vector<_Tp, _Allocator>::operator=(vector&& __x)
 _NOEXCEPT_(
 __alloc_traits::propagate_on_container_move_assignment::value &&
 is_nothrow_move_assignable<allocator_type>::value)
{
 __move_assign(__x, integral_constant<bool,
 __alloc_traits::propagate_on_container_move_assignment::value>());
 return *this;
}

template <class _Tp, class _Allocator>
void
vector<_Tp, _Allocator>::__move_assign(vector& __c, false_type)
{
 if (__base::__alloc() != __c.__alloc())
 {
 typedef move_iterator<iterator> _Ip;
 assign(_Ip(__c.begin()), _Ip(__c.end()));
 }
 else
 __move_assign(__c, true_type());
}

template <class _Tp, class _Allocator>
void
vector<_Tp, _Allocator>::__move_assign(vector& __c, true_type)
 _NOEXCEPT_(is_nothrow_move_assignable<allocator_type>::value)
{
 deallocate();
 __base::__move_assign_alloc(__c); // this can throw
 this->__begin_ = __c.__begin_;
 this->__end_ = __c.__end_;
 this->__end_cap() = __c.__end_cap();
 __c.__begin_ = __c.__end_ = __c.__end_cap() = nullptr;
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->swap(this, &__c);
#endif
}

#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES

template <class _Tp, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
vector<_Tp, _Allocator>&
vector<_Tp, _Allocator>::operator=(const vector& __x)
{
 if (this != &__x)
 {
 __base::__copy_assign_alloc(__x);
 assign(__x.__begin_, __x.__end_);
 }
 return *this;
}

template <class _Tp, class _Allocator>
template <class _InputIterator>
typename enable_if
<
 __is_input_iterator <_InputIterator>::value &&
 !__is_forward_iterator<_InputIterator>::value &&
 is_constructible<
 _Tp,
 typename iterator_traits<_InputIterator>::reference>::value,
 void
>::type
vector<_Tp, _Allocator>::assign(_InputIterator __first, _InputIterator __last)
{
 clear();
 for (; __first != __last; ++__first)
 push_back(*__first);
}

template <class _Tp, class _Allocator>
template <class _ForwardIterator>
typename enable_if
<
 __is_forward_iterator<_ForwardIterator>::value &&
 is_constructible<
 _Tp,
 typename iterator_traits<_ForwardIterator>::reference>::value,
 void
>::type
vector<_Tp, _Allocator>::assign(_ForwardIterator __first, _ForwardIterator __last)
{
 size_type __new_size = static_cast<size_type>(_VSTD::distance(__first, __last));
 if (__new_size <= capacity())
 {
 _ForwardIterator __mid = __last;
 bool __growing = false;
 if (__new_size > size())
 {
 __growing = true;
 __mid = __first;
 _VSTD::advance(__mid, size());
 }
 pointer __m = _VSTD::copy(__first, __mid, this->__begin_);
 if (__growing)
 __construct_at_end(__mid, __last, __new_size - size());
 else
 this->__destruct_at_end(__m);
 }
 else
 {
 deallocate();
 allocate(__recommend(__new_size));
 __construct_at_end(__first, __last, __new_size);
 }
}

template <class _Tp, class _Allocator>
void
vector<_Tp, _Allocator>::assign(size_type __n, const_reference __u)
{
 if (__n <= capacity())
 {
 size_type __s = size();
 _VSTD::fill_n(this->__begin_, _VSTD::min(__n, __s), __u);
 if (__n > __s)
 __construct_at_end(__n - __s, __u);
 else
 this->__destruct_at_end(this->__begin_ + __n);
 }
 else
 {
 deallocate();
 allocate(__recommend(static_cast<size_type>(__n)));
 __construct_at_end(__n, __u);
 }
}

template <class _Tp, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
typename vector<_Tp, _Allocator>::iterator
vector<_Tp, _Allocator>::__make_iter(pointer __p) _NOEXCEPT
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 return iterator(this, __p);
#else
 return iterator(__p);
#endif
}

template <class _Tp, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
typename vector<_Tp, _Allocator>::const_iterator
vector<_Tp, _Allocator>::__make_iter(const_pointer __p) const _NOEXCEPT
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 return const_iterator(this, __p);
#else
 return const_iterator(__p);
#endif
}

template <class _Tp, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
typename vector<_Tp, _Allocator>::iterator
vector<_Tp, _Allocator>::begin() _NOEXCEPT
{
 return __make_iter(this->__begin_);
}

template <class _Tp, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
typename vector<_Tp, _Allocator>::const_iterator
vector<_Tp, _Allocator>::begin() const _NOEXCEPT
{
 return __make_iter(this->__begin_);
}

template <class _Tp, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
typename vector<_Tp, _Allocator>::iterator
vector<_Tp, _Allocator>::end() _NOEXCEPT
{
 return __make_iter(this->__end_);
}

template <class _Tp, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
typename vector<_Tp, _Allocator>::const_iterator
vector<_Tp, _Allocator>::end() const _NOEXCEPT
{
 return __make_iter(this->__end_);
}

template <class _Tp, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
typename vector<_Tp, _Allocator>::reference
vector<_Tp, _Allocator>::operator[](size_type __n)
{
 _LIBCPP_ASSERT(__n < size(), "vector[] index out of bounds");
 return this->__begin_[__n];
}

template <class _Tp, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
typename vector<_Tp, _Allocator>::const_reference
vector<_Tp, _Allocator>::operator[](size_type __n) const
{
 _LIBCPP_ASSERT(__n < size(), "vector[] index out of bounds");
 return this->__begin_[__n];
}

template <class _Tp, class _Allocator>
typename vector<_Tp, _Allocator>::reference
vector<_Tp, _Allocator>::at(size_type __n)
{
 if (__n >= size())
 this->__throw_out_of_range();
 return this->__begin_[__n];
}

template <class _Tp, class _Allocator>
typename vector<_Tp, _Allocator>::const_reference
vector<_Tp, _Allocator>::at(size_type __n) const
{
 if (__n >= size())
 this->__throw_out_of_range();
 return this->__begin_[__n];
}

template <class _Tp, class _Allocator>
void
vector<_Tp, _Allocator>::reserve(size_type __n)
{
 if (__n > capacity())
 {
 allocator_type& __a = this->__alloc();
 __split_buffer<value_type, allocator_type&> __v(__n, size(), __a);
 __swap_out_circular_buffer(__v);
 }
}

template <class _Tp, class _Allocator>
void
vector<_Tp, _Allocator>::shrink_to_fit() _NOEXCEPT
{
 if (capacity() > size())
 {
#ifndef _LIBCPP_NO_EXCEPTIONS
 try
 {
#endif // _LIBCPP_NO_EXCEPTIONS
 allocator_type& __a = this->__alloc();
 __split_buffer<value_type, allocator_type&> __v(size(), size(), __a);
 __swap_out_circular_buffer(__v);
#ifndef _LIBCPP_NO_EXCEPTIONS
 }
 catch (...)
 {
 }
#endif // _LIBCPP_NO_EXCEPTIONS
 }
}

template <class _Tp, class _Allocator>
template <class _Up>
void
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
vector<_Tp, _Allocator>::__push_back_slow_path(_Up&& __x)
#else
vector<_Tp, _Allocator>::__push_back_slow_path(_Up& __x)
#endif
{
 allocator_type& __a = this->__alloc();
 __split_buffer<value_type, allocator_type&> __v(__recommend(size() + 1), size(), __a);
 // __v.push_back(_VSTD::forward<_Up>(__x));
 __alloc_traits::construct(__a, _VSTD::__to_raw_pointer(__v.__end_), _VSTD::forward<_Up>(__x));
 __v.__end_++;
 __swap_out_circular_buffer(__v);
}

template <class _Tp, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
void
vector<_Tp, _Allocator>::push_back(const_reference __x)
{
 if (this->__end_ != this->__end_cap())
 {
 __RAII_IncreaseAnnotator __annotator(*this);
 __alloc_traits::construct(this->__alloc(),
 _VSTD::__to_raw_pointer(this->__end_), __x);
 __annotator.__done();
 ++this->__end_;
 }
 else
 __push_back_slow_path(__x);
}

#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES

template <class _Tp, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
void
vector<_Tp, _Allocator>::push_back(value_type&& __x)
{
 if (this->__end_ < this->__end_cap())
 {
 __RAII_IncreaseAnnotator __annotator(*this);
 __alloc_traits::construct(this->__alloc(),
 _VSTD::__to_raw_pointer(this->__end_),
 _VSTD::move(__x));
 __annotator.__done();
 ++this->__end_;
 }
 else
 __push_back_slow_path(_VSTD::move(__x));
}

#ifndef _LIBCPP_HAS_NO_VARIADICS

template <class _Tp, class _Allocator>
template <class... _Args>
void
vector<_Tp, _Allocator>::__emplace_back_slow_path(_Args&&... __args)
{
 allocator_type& __a = this->__alloc();
 __split_buffer<value_type, allocator_type&> __v(__recommend(size() + 1), size(), __a);
// __v.emplace_back(_VSTD::forward<_Args>(__args)...);
 __alloc_traits::construct(__a, _VSTD::__to_raw_pointer(__v.__end_), _VSTD::forward<_Args>(__args)...);
 __v.__end_++;
 __swap_out_circular_buffer(__v);
}

template <class _Tp, class _Allocator>
template <class... _Args>
inline _LIBCPP_INLINE_VISIBILITY
void
vector<_Tp, _Allocator>::emplace_back(_Args&&... __args)
{
 if (this->__end_ < this->__end_cap())
 {
 __RAII_IncreaseAnnotator __annotator(*this);
 __alloc_traits::construct(this->__alloc(),
 _VSTD::__to_raw_pointer(this->__end_),
 _VSTD::forward<_Args>(__args)...);
 __annotator.__done();
 ++this->__end_;
 }
 else
 __emplace_back_slow_path(_VSTD::forward<_Args>(__args)...);
}

#endif // _LIBCPP_HAS_NO_VARIADICS
#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES

template <class _Tp, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
void
vector<_Tp, _Allocator>::pop_back()
{
 _LIBCPP_ASSERT(!empty(), "vector::pop_back called for empty vector");
 this->__destruct_at_end(this->__end_ - 1);
}

template <class _Tp, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
typename vector<_Tp, _Allocator>::iterator
vector<_Tp, _Allocator>::erase(const_iterator __position)
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__position) == this,
 "vector::erase(iterator) called with an iterator not"
 " referring to this vector");
#endif
 _LIBCPP_ASSERT(__position != end(),
 "vector::erase(iterator) called with a non-dereferenceable iterator");
 difference_type __ps = __position - cbegin();
 pointer __p = this->__begin_ + __ps;
 iterator __r = __make_iter(__p);
 this->__destruct_at_end(_VSTD::move(__p + 1, this->__end_, __p));
 return __r;
}

template <class _Tp, class _Allocator>
typename vector<_Tp, _Allocator>::iterator
vector<_Tp, _Allocator>::erase(const_iterator __first, const_iterator __last)
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__first) == this,
 "vector::erase(iterator, iterator) called with an iterator not"
 " referring to this vector");
#endif
 _LIBCPP_ASSERT(__first <= __last, "vector::erase(first, last) called with invalid range");
 pointer __p = this->__begin_ + (__first - begin());
 iterator __r = __make_iter(__p);
 if (__first != __last)
 this->__destruct_at_end(_VSTD::move(__p + (__last - __first), this->__end_, __p));
 return __r;
}

template <class _Tp, class _Allocator>
void
vector<_Tp, _Allocator>::__move_range(pointer __from_s, pointer __from_e, pointer __to)
{
 pointer __old_last = this->__end_;
 difference_type __n = __old_last - __to;
 for (pointer __i = __from_s + __n; __i < __from_e; ++__i, ++this->__end_)
 __alloc_traits::construct(this->__alloc(),
 _VSTD::__to_raw_pointer(this->__end_),
 _VSTD::move(*__i));
 _VSTD::move_backward(__from_s, __from_s + __n, __old_last);
}

template <class _Tp, class _Allocator>
typename vector<_Tp, _Allocator>::iterator
vector<_Tp, _Allocator>::insert(const_iterator __position, const_reference __x)
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__position) == this,
 "vector::insert(iterator, x) called with an iterator not"
 " referring to this vector");
#endif
 pointer __p = this->__begin_ + (__position - begin());
 if (this->__end_ < this->__end_cap())
 {
 __RAII_IncreaseAnnotator __annotator(*this);
 if (__p == this->__end_)
 {
 __alloc_traits::construct(this->__alloc(),
 _VSTD::__to_raw_pointer(this->__end_), __x);
 ++this->__end_;
 }
 else
 {
 __move_range(__p, this->__end_, __p + 1);
 const_pointer __xr = pointer_traits<const_pointer>::pointer_to(__x);
 if (__p <= __xr && __xr < this->__end_)
 ++__xr;
 *__p = *__xr;
 }
 __annotator.__done();
 }
 else
 {
 allocator_type& __a = this->__alloc();
 __split_buffer<value_type, allocator_type&> __v(__recommend(size() + 1), __p - this->__begin_, __a);
 __v.push_back(__x);
 __p = __swap_out_circular_buffer(__v, __p);
 }
 return __make_iter(__p);
}

#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES

template <class _Tp, class _Allocator>
typename vector<_Tp, _Allocator>::iterator
vector<_Tp, _Allocator>::insert(const_iterator __position, value_type&& __x)
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__position) == this,
 "vector::insert(iterator, x) called with an iterator not"
 " referring to this vector");
#endif
 pointer __p = this->__begin_ + (__position - begin());
 if (this->__end_ < this->__end_cap())
 {
 __RAII_IncreaseAnnotator __annotator(*this);
 if (__p == this->__end_)
 {
 __alloc_traits::construct(this->__alloc(),
 _VSTD::__to_raw_pointer(this->__end_),
 _VSTD::move(__x));
 ++this->__end_;
 }
 else
 {
 __move_range(__p, this->__end_, __p + 1);
 *__p = _VSTD::move(__x);
 }
 __annotator.__done();
 }
 else
 {
 allocator_type& __a = this->__alloc();
 __split_buffer<value_type, allocator_type&> __v(__recommend(size() + 1), __p - this->__begin_, __a);
 __v.push_back(_VSTD::move(__x));
 __p = __swap_out_circular_buffer(__v, __p);
 }
 return __make_iter(__p);
}

#ifndef _LIBCPP_HAS_NO_VARIADICS

template <class _Tp, class _Allocator>
template <class... _Args>
typename vector<_Tp, _Allocator>::iterator
vector<_Tp, _Allocator>::emplace(const_iterator __position, _Args&&... __args)
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__position) == this,
 "vector::emplace(iterator, x) called with an iterator not"
 " referring to this vector");
#endif
 pointer __p = this->__begin_ + (__position - begin());
 if (this->__end_ < this->__end_cap())
 {
 __RAII_IncreaseAnnotator __annotator(*this);
 if (__p == this->__end_)
 {
 __alloc_traits::construct(this->__alloc(),
 _VSTD::__to_raw_pointer(this->__end_),
 _VSTD::forward<_Args>(__args)...);
 ++this->__end_;
 }
 else
 {
 value_type __tmp(_VSTD::forward<_Args>(__args)...);
 __move_range(__p, this->__end_, __p + 1);
 *__p = _VSTD::move(__tmp);
 }
 __annotator.__done();
 }
 else
 {
 allocator_type& __a = this->__alloc();
 __split_buffer<value_type, allocator_type&> __v(__recommend(size() + 1), __p - this->__begin_, __a);
 __v.emplace_back(_VSTD::forward<_Args>(__args)...);
 __p = __swap_out_circular_buffer(__v, __p);
 }
 return __make_iter(__p);
}

#endif // _LIBCPP_HAS_NO_VARIADICS
#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES

template <class _Tp, class _Allocator>
typename vector<_Tp, _Allocator>::iterator
vector<_Tp, _Allocator>::insert(const_iterator __position, size_type __n, const_reference __x)
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__position) == this,
 "vector::insert(iterator, n, x) called with an iterator not"
 " referring to this vector");
#endif
 pointer __p = this->__begin_ + (__position - begin());
 if (__n > 0)
 {
 if (__n <= static_cast<size_type>(this->__end_cap() - this->__end_))
 {
 size_type __old_n = __n;
 pointer __old_last = this->__end_;
 if (__n > static_cast<size_type>(this->__end_ - __p))
 {
 size_type __cx = __n - (this->__end_ - __p);
 __construct_at_end(__cx, __x);
 __n -= __cx;
 }
 if (__n > 0)
 {
 __RAII_IncreaseAnnotator __annotator(*this, __n);
 __move_range(__p, __old_last, __p + __old_n);
 __annotator.__done();
 const_pointer __xr = pointer_traits<const_pointer>::pointer_to(__x);
 if (__p <= __xr && __xr < this->__end_)
 __xr += __old_n;
 _VSTD::fill_n(__p, __n, *__xr);
 }
 }
 else
 {
 allocator_type& __a = this->__alloc();
 __split_buffer<value_type, allocator_type&> __v(__recommend(size() + __n), __p - this->__begin_, __a);
 __v.__construct_at_end(__n, __x);
 __p = __swap_out_circular_buffer(__v, __p);
 }
 }
 return __make_iter(__p);
}

template <class _Tp, class _Allocator>
template <class _InputIterator>
typename enable_if
<
 __is_input_iterator <_InputIterator>::value &&
 !__is_forward_iterator<_InputIterator>::value &&
 is_constructible<
 _Tp,
 typename iterator_traits<_InputIterator>::reference>::value,
 typename vector<_Tp, _Allocator>::iterator
>::type
vector<_Tp, _Allocator>::insert(const_iterator __position, _InputIterator __first, _InputIterator __last)
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__position) == this,
 "vector::insert(iterator, range) called with an iterator not"
 " referring to this vector");
#endif
 difference_type __off = __position - begin();
 pointer __p = this->__begin_ + __off;
 allocator_type& __a = this->__alloc();
 pointer __old_last = this->__end_;
 for (; this->__end_ != this->__end_cap() && __first != __last; ++__first)
 {
 __alloc_traits::construct(__a, _VSTD::__to_raw_pointer(this->__end_),
 *__first);
 ++this->__end_;
 }
 __split_buffer<value_type, allocator_type&> __v(__a);
 if (__first != __last)
 {
#ifndef _LIBCPP_NO_EXCEPTIONS
 try
 {
#endif // _LIBCPP_NO_EXCEPTIONS
 __v.__construct_at_end(__first, __last);
 difference_type __old_size = __old_last - this->__begin_;
 difference_type __old_p = __p - this->__begin_;
 reserve(__recommend(size() + __v.size()));
 __p = this->__begin_ + __old_p;
 __old_last = this->__begin_ + __old_size;
#ifndef _LIBCPP_NO_EXCEPTIONS
 }
 catch (...)
 {
 erase(__make_iter(__old_last), end());
 throw;
 }
#endif // _LIBCPP_NO_EXCEPTIONS
 }
 __p = _VSTD::rotate(__p, __old_last, this->__end_);
 insert(__make_iter(__p), make_move_iterator(__v.begin()),
 make_move_iterator(__v.end()));
 return begin() + __off;
}

template <class _Tp, class _Allocator>
template <class _ForwardIterator>
typename enable_if
<
 __is_forward_iterator<_ForwardIterator>::value &&
 is_constructible<
 _Tp,
 typename iterator_traits<_ForwardIterator>::reference>::value,
 typename vector<_Tp, _Allocator>::iterator
>::type
vector<_Tp, _Allocator>::insert(const_iterator __position, _ForwardIterator __first, _ForwardIterator __last)
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__position) == this,
 "vector::insert(iterator, range) called with an iterator not"
 " referring to this vector");
#endif
 pointer __p = this->__begin_ + (__position - begin());
 difference_type __n = _VSTD::distance(__first, __last);
 if (__n > 0)
 {
 if (__n <= this->__end_cap() - this->__end_)
 {
 size_type __old_n = __n;
 pointer __old_last = this->__end_;
 _ForwardIterator __m = __last;
 difference_type __dx = this->__end_ - __p;
 if (__n > __dx)
 {
 __m = __first;
 difference_type __diff = this->__end_ - __p;
 _VSTD::advance(__m, __diff);
 __construct_at_end(__m, __last, __n - __diff);
 __n = __dx;
 }
 if (__n > 0)
 {
 __RAII_IncreaseAnnotator __annotator(*this, __n);
 __move_range(__p, __old_last, __p + __old_n);
 __annotator.__done();
 _VSTD::copy(__first, __m, __p);
 }
 }
 else
 {
 allocator_type& __a = this->__alloc();
 __split_buffer<value_type, allocator_type&> __v(__recommend(size() + __n), __p - this->__begin_, __a);
 __v.__construct_at_end(__first, __last);
 __p = __swap_out_circular_buffer(__v, __p);
 }
 }
 return __make_iter(__p);
}

template <class _Tp, class _Allocator>
void
vector<_Tp, _Allocator>::resize(size_type __sz)
{
 size_type __cs = size();
 if (__cs < __sz)
 this->__append(__sz - __cs);
 else if (__cs > __sz)
 this->__destruct_at_end(this->__begin_ + __sz);
}

template <class _Tp, class _Allocator>
void
vector<_Tp, _Allocator>::resize(size_type __sz, const_reference __x)
{
 size_type __cs = size();
 if (__cs < __sz)
 this->__append(__sz - __cs, __x);
 else if (__cs > __sz)
 this->__destruct_at_end(this->__begin_ + __sz);
}

template <class _Tp, class _Allocator>
void
vector<_Tp, _Allocator>::swap(vector& __x)
#if _LIBCPP_STD_VER >= 14
 _NOEXCEPT
#else
 _NOEXCEPT_(!__alloc_traits::propagate_on_container_swap::value || 
 __is_nothrow_swappable<allocator_type>::value)
#endif
{
 _LIBCPP_ASSERT(__alloc_traits::propagate_on_container_swap::value ||
 this->__alloc() == __x.__alloc(),
 "vector::swap: Either propagate_on_container_swap must be true"
 " or the allocators must compare equal");
 _VSTD::swap(this->__begin_, __x.__begin_);
 _VSTD::swap(this->__end_, __x.__end_);
 _VSTD::swap(this->__end_cap(), __x.__end_cap());
 __swap_allocator(this->__alloc(), __x.__alloc(), 
 integral_constant<bool,__alloc_traits::propagate_on_container_swap::value>());
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->swap(this, &__x);
#endif // _LIBCPP_DEBUG_LEVEL >= 2
}

template <class _Tp, class _Allocator>
bool
vector<_Tp, _Allocator>::__invariants() const
{
 if (this->__begin_ == nullptr)
 {
 if (this->__end_ != nullptr || this->__end_cap() != nullptr)
 return false;
 }
 else
 {
 if (this->__begin_ > this->__end_)
 return false;
 if (this->__begin_ == this->__end_cap())
 return false;
 if (this->__end_ > this->__end_cap())
 return false;
 }
 return true;
}

#if _LIBCPP_DEBUG_LEVEL >= 2

template <class _Tp, class _Allocator>
bool
vector<_Tp, _Allocator>::__dereferenceable(const const_iterator* __i) const
{
 return this->__begin_ <= __i->base() && __i->base() < this->__end_;
}

template <class _Tp, class _Allocator>
bool
vector<_Tp, _Allocator>::__decrementable(const const_iterator* __i) const
{
 return this->__begin_ < __i->base() && __i->base() <= this->__end_;
}

template <class _Tp, class _Allocator>
bool
vector<_Tp, _Allocator>::__addable(const const_iterator* __i, ptrdiff_t __n) const
{
 const_pointer __p = __i->base() + __n;
 return this->__begin_ <= __p && __p <= this->__end_;
}

template <class _Tp, class _Allocator>
bool
vector<_Tp, _Allocator>::__subscriptable(const const_iterator* __i, ptrdiff_t __n) const
{
 const_pointer __p = __i->base() + __n;
 return this->__begin_ <= __p && __p < this->__end_;
}

#endif // _LIBCPP_DEBUG_LEVEL >= 2

template <class _Tp, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
void
vector<_Tp, _Allocator>::__invalidate_all_iterators()
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__invalidate_all(this);
#endif // _LIBCPP_DEBUG_LEVEL >= 2
}

// vector<bool>

template <class _Allocator> class vector<bool, _Allocator>;

template <class _Allocator> struct hash<vector<bool, _Allocator> >;

template <class _Allocator>
struct __has_storage_type<vector<bool, _Allocator> >
{
 static const bool value = true;
};

template <class _Allocator>
class _LIBCPP_TYPE_VIS_ONLY vector<bool, _Allocator>
 : private __vector_base_common<true>
{
public:
 typedef vector __self;
 typedef bool value_type;
 typedef _Allocator allocator_type;
 typedef allocator_traits<allocator_type> __alloc_traits;
 typedef typename __alloc_traits::size_type size_type;
 typedef typename __alloc_traits::difference_type difference_type;
 typedef size_type __storage_type;
 typedef __bit_iterator<vector, false> pointer;
 typedef __bit_iterator<vector, true> const_pointer;
 typedef pointer iterator;
 typedef const_pointer const_iterator;
 typedef _VSTD::reverse_iterator<iterator> reverse_iterator;
 typedef _VSTD::reverse_iterator<const_iterator> const_reverse_iterator;

private:
 typedef typename __rebind_alloc_helper<__alloc_traits, __storage_type>::type __storage_allocator;
 typedef allocator_traits<__storage_allocator> __storage_traits;
 typedef typename __storage_traits::pointer __storage_pointer;
 typedef typename __storage_traits::const_pointer __const_storage_pointer;

 __storage_pointer __begin_;
 size_type __size_;
 __compressed_pair<size_type, __storage_allocator> __cap_alloc_;
public:
 typedef __bit_reference<vector> reference;
 typedef __bit_const_reference<vector> const_reference;
private:
 _LIBCPP_INLINE_VISIBILITY
 size_type& __cap() _NOEXCEPT
 {return __cap_alloc_.first();}
 _LIBCPP_INLINE_VISIBILITY
 const size_type& __cap() const _NOEXCEPT
 {return __cap_alloc_.first();}
 _LIBCPP_INLINE_VISIBILITY
 __storage_allocator& __alloc() _NOEXCEPT
 {return __cap_alloc_.second();}
 _LIBCPP_INLINE_VISIBILITY
 const __storage_allocator& __alloc() const _NOEXCEPT
 {return __cap_alloc_.second();}

 static const unsigned __bits_per_word = static_cast<unsigned>(sizeof(__storage_type) * CHAR_BIT);

 _LIBCPP_INLINE_VISIBILITY
 static size_type __internal_cap_to_external(size_type __n) _NOEXCEPT
 {return __n * __bits_per_word;}
 _LIBCPP_INLINE_VISIBILITY
 static size_type __external_cap_to_internal(size_type __n) _NOEXCEPT
 {return (__n - 1) / __bits_per_word + 1;}

public:
 _LIBCPP_INLINE_VISIBILITY
 vector() _NOEXCEPT_(is_nothrow_default_constructible<allocator_type>::value);

 _LIBCPP_INLINE_VISIBILITY explicit vector(const allocator_type& __a)
#if _LIBCPP_STD_VER <= 14
 _NOEXCEPT_(is_nothrow_copy_constructible<allocator_type>::value);
#else
 _NOEXCEPT;
#endif
 ~vector();
 explicit vector(size_type __n);
#if _LIBCPP_STD_VER > 11
 explicit vector(size_type __n, const allocator_type& __a);
#endif
 vector(size_type __n, const value_type& __v);
 vector(size_type __n, const value_type& __v, const allocator_type& __a);
 template <class _InputIterator>
 vector(_InputIterator __first, _InputIterator __last,
 typename enable_if<__is_input_iterator <_InputIterator>::value &&
 !__is_forward_iterator<_InputIterator>::value>::type* = 0);
 template <class _InputIterator>
 vector(_InputIterator __first, _InputIterator __last, const allocator_type& __a,
 typename enable_if<__is_input_iterator <_InputIterator>::value &&
 !__is_forward_iterator<_InputIterator>::value>::type* = 0);
 template <class _ForwardIterator>
 vector(_ForwardIterator __first, _ForwardIterator __last,
 typename enable_if<__is_forward_iterator<_ForwardIterator>::value>::type* = 0);
 template <class _ForwardIterator>
 vector(_ForwardIterator __first, _ForwardIterator __last, const allocator_type& __a,
 typename enable_if<__is_forward_iterator<_ForwardIterator>::value>::type* = 0);

 vector(const vector& __v);
 vector(const vector& __v, const allocator_type& __a);
 vector& operator=(const vector& __v);
#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
 vector(initializer_list<value_type> __il);
 vector(initializer_list<value_type> __il, const allocator_type& __a);
#endif // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
 _LIBCPP_INLINE_VISIBILITY
 vector(vector&& __v)
 _NOEXCEPT_(is_nothrow_move_constructible<allocator_type>::value);
 vector(vector&& __v, const allocator_type& __a);
 _LIBCPP_INLINE_VISIBILITY
 vector& operator=(vector&& __v)
 _NOEXCEPT_(
 __alloc_traits::propagate_on_container_move_assignment::value &&
 is_nothrow_move_assignable<allocator_type>::value);
#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
 _LIBCPP_INLINE_VISIBILITY
 vector& operator=(initializer_list<value_type> __il)
 {assign(__il.begin(), __il.end()); return *this;}
#endif // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

 template <class _InputIterator>
 typename enable_if
 <
 __is_input_iterator<_InputIterator>::value &&
 !__is_forward_iterator<_InputIterator>::value,
 void
 >::type
 assign(_InputIterator __first, _InputIterator __last);
 template <class _ForwardIterator>
 typename enable_if
 <
 __is_forward_iterator<_ForwardIterator>::value,
 void
 >::type
 assign(_ForwardIterator __first, _ForwardIterator __last);

 void assign(size_type __n, const value_type& __x);
#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
 _LIBCPP_INLINE_VISIBILITY
 void assign(initializer_list<value_type> __il)
 {assign(__il.begin(), __il.end());}
#endif // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

 _LIBCPP_INLINE_VISIBILITY allocator_type get_allocator() const _NOEXCEPT
 {return allocator_type(this->__alloc());}

 size_type max_size() const _NOEXCEPT;
 _LIBCPP_INLINE_VISIBILITY
 size_type capacity() const _NOEXCEPT
 {return __internal_cap_to_external(__cap());}
 _LIBCPP_INLINE_VISIBILITY
 size_type size() const _NOEXCEPT
 {return __size_;}
 _LIBCPP_INLINE_VISIBILITY
 bool empty() const _NOEXCEPT
 {return __size_ == 0;}
 void reserve(size_type __n);
 void shrink_to_fit() _NOEXCEPT;

 _LIBCPP_INLINE_VISIBILITY
 iterator begin() _NOEXCEPT
 {return __make_iter(0);}
 _LIBCPP_INLINE_VISIBILITY
 const_iterator begin() const _NOEXCEPT
 {return __make_iter(0);}
 _LIBCPP_INLINE_VISIBILITY
 iterator end() _NOEXCEPT
 {return __make_iter(__size_);}
 _LIBCPP_INLINE_VISIBILITY
 const_iterator end() const _NOEXCEPT
 {return __make_iter(__size_);}

 _LIBCPP_INLINE_VISIBILITY
 reverse_iterator rbegin() _NOEXCEPT
 {return reverse_iterator(end());}
 _LIBCPP_INLINE_VISIBILITY
 const_reverse_iterator rbegin() const _NOEXCEPT
 {return const_reverse_iterator(end());}
 _LIBCPP_INLINE_VISIBILITY
 reverse_iterator rend() _NOEXCEPT
 {return reverse_iterator(begin());}
 _LIBCPP_INLINE_VISIBILITY
 const_reverse_iterator rend() const _NOEXCEPT
 {return const_reverse_iterator(begin());}

 _LIBCPP_INLINE_VISIBILITY
 const_iterator cbegin() const _NOEXCEPT
 {return __make_iter(0);}
 _LIBCPP_INLINE_VISIBILITY
 const_iterator cend() const _NOEXCEPT
 {return __make_iter(__size_);}
 _LIBCPP_INLINE_VISIBILITY
 const_reverse_iterator crbegin() const _NOEXCEPT
 {return rbegin();}
 _LIBCPP_INLINE_VISIBILITY
 const_reverse_iterator crend() const _NOEXCEPT
 {return rend();}

 _LIBCPP_INLINE_VISIBILITY reference operator[](size_type __n) {return __make_ref(__n);}
 _LIBCPP_INLINE_VISIBILITY const_reference operator[](size_type __n) const {return __make_ref(__n);}
 reference at(size_type __n);
 const_reference at(size_type __n) const;

 _LIBCPP_INLINE_VISIBILITY reference front() {return __make_ref(0);}
 _LIBCPP_INLINE_VISIBILITY const_reference front() const {return __make_ref(0);}
 _LIBCPP_INLINE_VISIBILITY reference back() {return __make_ref(__size_ - 1);}
 _LIBCPP_INLINE_VISIBILITY const_reference back() const {return __make_ref(__size_ - 1);}

 void push_back(const value_type& __x);
#if _LIBCPP_STD_VER > 11
 template <class... _Args>
 _LIBCPP_INLINE_VISIBILITY void emplace_back(_Args&&... __args)
 { push_back ( value_type ( _VSTD::forward<_Args>(__args)... )); }
#endif

 _LIBCPP_INLINE_VISIBILITY void pop_back() {--__size_;}

#if _LIBCPP_STD_VER > 11
 template <class... _Args>
 _LIBCPP_INLINE_VISIBILITY iterator emplace(const_iterator position, _Args&&... __args)
 { return insert ( position, value_type ( _VSTD::forward<_Args>(__args)... )); }
#endif

 iterator insert(const_iterator __position, const value_type& __x);
 iterator insert(const_iterator __position, size_type __n, const value_type& __x);
 iterator insert(const_iterator __position, size_type __n, const_reference __x);
 template <class _InputIterator>
 typename enable_if
 <
 __is_input_iterator <_InputIterator>::value &&
 !__is_forward_iterator<_InputIterator>::value,
 iterator
 >::type
 insert(const_iterator __position, _InputIterator __first, _InputIterator __last);
 template <class _ForwardIterator>
 typename enable_if
 <
 __is_forward_iterator<_ForwardIterator>::value,
 iterator
 >::type
 insert(const_iterator __position, _ForwardIterator __first, _ForwardIterator __last);
#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
 _LIBCPP_INLINE_VISIBILITY
 iterator insert(const_iterator __position, initializer_list<value_type> __il)
 {return insert(__position, __il.begin(), __il.end());}
#endif // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

 _LIBCPP_INLINE_VISIBILITY iterator erase(const_iterator __position);
 iterator erase(const_iterator __first, const_iterator __last);

 _LIBCPP_INLINE_VISIBILITY
 void clear() _NOEXCEPT {__size_ = 0;}

 void swap(vector&)
#if _LIBCPP_STD_VER >= 14
 _NOEXCEPT;
#else
 _NOEXCEPT_(!__alloc_traits::propagate_on_container_swap::value || 
 __is_nothrow_swappable<allocator_type>::value);
#endif

 void resize(size_type __sz, value_type __x = false);
 void flip() _NOEXCEPT;

 bool __invariants() const;

private:
 _LIBCPP_INLINE_VISIBILITY void __invalidate_all_iterators();
 void allocate(size_type __n);
 void deallocate() _NOEXCEPT;
 _LIBCPP_INLINE_VISIBILITY
 static size_type __align_it(size_type __new_size) _NOEXCEPT
 {return __new_size + (__bits_per_word-1) & ~((size_type)__bits_per_word-1);};
 _LIBCPP_INLINE_VISIBILITY size_type __recommend(size_type __new_size) const;
 _LIBCPP_INLINE_VISIBILITY void __construct_at_end(size_type __n, bool __x);
 template <class _ForwardIterator>
 typename enable_if
 <
 __is_forward_iterator<_ForwardIterator>::value,
 void
 >::type
 __construct_at_end(_ForwardIterator __first, _ForwardIterator __last);
 void __append(size_type __n, const_reference __x);
 _LIBCPP_INLINE_VISIBILITY
 reference __make_ref(size_type __pos) _NOEXCEPT
 {return reference(__begin_ + __pos / __bits_per_word, __storage_type(1) << __pos % __bits_per_word);}
 _LIBCPP_INLINE_VISIBILITY
 const_reference __make_ref(size_type __pos) const _NOEXCEPT
 {return const_reference(__begin_ + __pos / __bits_per_word, __storage_type(1) << __pos % __bits_per_word);}
 _LIBCPP_INLINE_VISIBILITY
 iterator __make_iter(size_type __pos) _NOEXCEPT
 {return iterator(__begin_ + __pos / __bits_per_word, static_cast<unsigned>(__pos % __bits_per_word));}
 _LIBCPP_INLINE_VISIBILITY
 const_iterator __make_iter(size_type __pos) const _NOEXCEPT
 {return const_iterator(__begin_ + __pos / __bits_per_word, static_cast<unsigned>(__pos % __bits_per_word));}
 _LIBCPP_INLINE_VISIBILITY
 iterator __const_iterator_cast(const_iterator __p) _NOEXCEPT
 {return begin() + (__p - cbegin());}

 _LIBCPP_INLINE_VISIBILITY
 void __copy_assign_alloc(const vector& __v)
 {__copy_assign_alloc(__v, integral_constant<bool,
 __storage_traits::propagate_on_container_copy_assignment::value>());}
 _LIBCPP_INLINE_VISIBILITY
 void __copy_assign_alloc(const vector& __c, true_type)
 {
 if (__alloc() != __c.__alloc())
 deallocate();
 __alloc() = __c.__alloc();
 }

 _LIBCPP_INLINE_VISIBILITY
 void __copy_assign_alloc(const vector&, false_type)
 {}

 void __move_assign(vector& __c, false_type);
 void __move_assign(vector& __c, true_type)
 _NOEXCEPT_(is_nothrow_move_assignable<allocator_type>::value);
 _LIBCPP_INLINE_VISIBILITY
 void __move_assign_alloc(vector& __c)
 _NOEXCEPT_(
 !__storage_traits::propagate_on_container_move_assignment::value ||
 is_nothrow_move_assignable<allocator_type>::value)
 {__move_assign_alloc(__c, integral_constant<bool,
 __storage_traits::propagate_on_container_move_assignment::value>());}
 _LIBCPP_INLINE_VISIBILITY
 void __move_assign_alloc(vector& __c, true_type)
 _NOEXCEPT_(is_nothrow_move_assignable<allocator_type>::value)
 {
 __alloc() = _VSTD::move(__c.__alloc());
 }

 _LIBCPP_INLINE_VISIBILITY
 void __move_assign_alloc(vector&, false_type)
 _NOEXCEPT
 {}

 size_t __hash_code() const _NOEXCEPT;

 friend class __bit_reference<vector>;
 friend class __bit_const_reference<vector>;
 friend class __bit_iterator<vector, false>;
 friend class __bit_iterator<vector, true>;
 friend struct __bit_array<vector>;
 friend struct _LIBCPP_TYPE_VIS_ONLY hash<vector>;
};

template <class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
void
vector<bool, _Allocator>::__invalidate_all_iterators()
{
}

// Allocate space for __n objects
// throws length_error if __n > max_size()
// throws (probably bad_alloc) if memory run out
// Precondition: __begin_ == __end_ == __cap() == 0
// Precondition: __n > 0
// Postcondition: capacity() == __n
// Postcondition: size() == 0
template <class _Allocator>
void
vector<bool, _Allocator>::allocate(size_type __n)
{
 if (__n > max_size())
 this->__throw_length_error();
 __n = __external_cap_to_internal(__n);
 this->__begin_ = __storage_traits::allocate(this->__alloc(), __n);
 this->__size_ = 0;
 this->__cap() = __n;
}

template <class _Allocator>
void
vector<bool, _Allocator>::deallocate() _NOEXCEPT
{
 if (this->__begin_ != nullptr)
 {
 __storage_traits::deallocate(this->__alloc(), this->__begin_, __cap());
 __invalidate_all_iterators();
 this->__begin_ = nullptr;
 this->__size_ = this->__cap() = 0;
 }
}

template <class _Allocator>
typename vector<bool, _Allocator>::size_type
vector<bool, _Allocator>::max_size() const _NOEXCEPT
{
 size_type __amax = __storage_traits::max_size(__alloc());
 size_type __nmax = numeric_limits<size_type>::max() / 2; // end() >= begin(), always
 if (__nmax / __bits_per_word <= __amax)
 return __nmax;
 return __internal_cap_to_external(__amax);
}

// Precondition: __new_size > capacity()
template <class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
typename vector<bool, _Allocator>::size_type
vector<bool, _Allocator>::__recommend(size_type __new_size) const
{
 const size_type __ms = max_size();
 if (__new_size > __ms)
 this->__throw_length_error();
 const size_type __cap = capacity();
 if (__cap >= __ms / 2)
 return __ms;
 return _VSTD::max(2*__cap, __align_it(__new_size));
}

// Default constructs __n objects starting at __end_
// Precondition: __n > 0
// Precondition: size() + __n <= capacity()
// Postcondition: size() == size() + __n
template <class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
void
vector<bool, _Allocator>::__construct_at_end(size_type __n, bool __x)
{
 size_type __old_size = this->__size_;
 this->__size_ += __n;
 _VSTD::fill_n(__make_iter(__old_size), __n, __x);
}

template <class _Allocator>
template <class _ForwardIterator>
typename enable_if
<
 __is_forward_iterator<_ForwardIterator>::value,
 void
>::type
vector<bool, _Allocator>::__construct_at_end(_ForwardIterator __first, _ForwardIterator __last)
{
 size_type __old_size = this->__size_;
 this->__size_ += _VSTD::distance(__first, __last);
 _VSTD::copy(__first, __last, __make_iter(__old_size));
}

template <class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
vector<bool, _Allocator>::vector()
 _NOEXCEPT_(is_nothrow_default_constructible<allocator_type>::value)
 : __begin_(nullptr),
 __size_(0),
 __cap_alloc_(0)
{
}

template <class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
vector<bool, _Allocator>::vector(const allocator_type& __a)
#if _LIBCPP_STD_VER <= 14
 _NOEXCEPT_(is_nothrow_copy_constructible<allocator_type>::value)
#else
 _NOEXCEPT
#endif
 : __begin_(nullptr),
 __size_(0),
 __cap_alloc_(0, static_cast<__storage_allocator>(__a))
{
}

template <class _Allocator>
vector<bool, _Allocator>::vector(size_type __n)
 : __begin_(nullptr),
 __size_(0),
 __cap_alloc_(0)
{
 if (__n > 0)
 {
 allocate(__n);
 __construct_at_end(__n, false);
 }
}

#if _LIBCPP_STD_VER > 11
template <class _Allocator>
vector<bool, _Allocator>::vector(size_type __n, const allocator_type& __a)
 : __begin_(nullptr),
 __size_(0),
 __cap_alloc_(0, static_cast<__storage_allocator>(__a))
{
 if (__n > 0)
 {
 allocate(__n);
 __construct_at_end(__n, false);
 }
}
#endif

template <class _Allocator>
vector<bool, _Allocator>::vector(size_type __n, const value_type& __x)
 : __begin_(nullptr),
 __size_(0),
 __cap_alloc_(0)
{
 if (__n > 0)
 {
 allocate(__n);
 __construct_at_end(__n, __x);
 }
}

template <class _Allocator>
vector<bool, _Allocator>::vector(size_type __n, const value_type& __x, const allocator_type& __a)
 : __begin_(nullptr),
 __size_(0),
 __cap_alloc_(0, static_cast<__storage_allocator>(__a))
{
 if (__n > 0)
 {
 allocate(__n);
 __construct_at_end(__n, __x);
 }
}

template <class _Allocator>
template <class _InputIterator>
vector<bool, _Allocator>::vector(_InputIterator __first, _InputIterator __last,
 typename enable_if<__is_input_iterator <_InputIterator>::value &&
 !__is_forward_iterator<_InputIterator>::value>::type*)
 : __begin_(nullptr),
 __size_(0),
 __cap_alloc_(0)
{
#ifndef _LIBCPP_NO_EXCEPTIONS
 try
 {
#endif // _LIBCPP_NO_EXCEPTIONS
 for (; __first != __last; ++__first)
 push_back(*__first);
#ifndef _LIBCPP_NO_EXCEPTIONS
 }
 catch (...)
 {
 if (__begin_ != nullptr)
 __storage_traits::deallocate(__alloc(), __begin_, __cap());
 __invalidate_all_iterators();
 throw;
 }
#endif // _LIBCPP_NO_EXCEPTIONS
}

template <class _Allocator>
template <class _InputIterator>
vector<bool, _Allocator>::vector(_InputIterator __first, _InputIterator __last, const allocator_type& __a,
 typename enable_if<__is_input_iterator <_InputIterator>::value &&
 !__is_forward_iterator<_InputIterator>::value>::type*)
 : __begin_(nullptr),
 __size_(0),
 __cap_alloc_(0, static_cast<__storage_allocator>(__a))
{
#ifndef _LIBCPP_NO_EXCEPTIONS
 try
 {
#endif // _LIBCPP_NO_EXCEPTIONS
 for (; __first != __last; ++__first)
 push_back(*__first);
#ifndef _LIBCPP_NO_EXCEPTIONS
 }
 catch (...)
 {
 if (__begin_ != nullptr)
 __storage_traits::deallocate(__alloc(), __begin_, __cap());
 __invalidate_all_iterators();
 throw;
 }
#endif // _LIBCPP_NO_EXCEPTIONS
}

template <class _Allocator>
template <class _ForwardIterator>
vector<bool, _Allocator>::vector(_ForwardIterator __first, _ForwardIterator __last,
 typename enable_if<__is_forward_iterator<_ForwardIterator>::value>::type*)
 : __begin_(nullptr),
 __size_(0),
 __cap_alloc_(0)
{
 size_type __n = static_cast<size_type>(_VSTD::distance(__first, __last));
 if (__n > 0)
 {
 allocate(__n);
 __construct_at_end(__first, __last);
 }
}

template <class _Allocator>
template <class _ForwardIterator>
vector<bool, _Allocator>::vector(_ForwardIterator __first, _ForwardIterator __last, const allocator_type& __a,
 typename enable_if<__is_forward_iterator<_ForwardIterator>::value>::type*)
 : __begin_(nullptr),
 __size_(0),
 __cap_alloc_(0, static_cast<__storage_allocator>(__a))
{
 size_type __n = static_cast<size_type>(_VSTD::distance(__first, __last));
 if (__n > 0)
 {
 allocate(__n);
 __construct_at_end(__first, __last);
 }
}

#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

template <class _Allocator>
vector<bool, _Allocator>::vector(initializer_list<value_type> __il)
 : __begin_(nullptr),
 __size_(0),
 __cap_alloc_(0)
{
 size_type __n = static_cast<size_type>(__il.size());
 if (__n > 0)
 {
 allocate(__n);
 __construct_at_end(__il.begin(), __il.end());
 }
}

template <class _Allocator>
vector<bool, _Allocator>::vector(initializer_list<value_type> __il, const allocator_type& __a)
 : __begin_(nullptr),
 __size_(0),
 __cap_alloc_(0, static_cast<__storage_allocator>(__a))
{
 size_type __n = static_cast<size_type>(__il.size());
 if (__n > 0)
 {
 allocate(__n);
 __construct_at_end(__il.begin(), __il.end());
 }
}

#endif // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

template <class _Allocator>
vector<bool, _Allocator>::~vector()
{
 if (__begin_ != nullptr)
 __storage_traits::deallocate(__alloc(), __begin_, __cap());
 __invalidate_all_iterators();
}

template <class _Allocator>
vector<bool, _Allocator>::vector(const vector& __v)
 : __begin_(nullptr),
 __size_(0),
 __cap_alloc_(0, __storage_traits::select_on_container_copy_construction(__v.__alloc()))
{
 if (__v.size() > 0)
 {
 allocate(__v.size());
 __construct_at_end(__v.begin(), __v.end());
 }
}

template <class _Allocator>
vector<bool, _Allocator>::vector(const vector& __v, const allocator_type& __a)
 : __begin_(nullptr),
 __size_(0),
 __cap_alloc_(0, __a)
{
 if (__v.size() > 0)
 {
 allocate(__v.size());
 __construct_at_end(__v.begin(), __v.end());
 }
}

template <class _Allocator>
vector<bool, _Allocator>&
vector<bool, _Allocator>::operator=(const vector& __v)
{
 if (this != &__v)
 {
 __copy_assign_alloc(__v);
 if (__v.__size_)
 {
 if (__v.__size_ > capacity())
 {
 deallocate();
 allocate(__v.__size_);
 }
 _VSTD::copy(__v.__begin_, __v.__begin_ + __external_cap_to_internal(__v.__size_), __begin_);
 }
 __size_ = __v.__size_;
 }
 return *this;
}

#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES

template <class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
vector<bool, _Allocator>::vector(vector&& __v)
 _NOEXCEPT_(is_nothrow_move_constructible<allocator_type>::value)
 : __begin_(__v.__begin_),
 __size_(__v.__size_),
 __cap_alloc_(__v.__cap_alloc_)
{
 __v.__begin_ = nullptr;
 __v.__size_ = 0;
 __v.__cap() = 0;
}

template <class _Allocator>
vector<bool, _Allocator>::vector(vector&& __v, const allocator_type& __a)
 : __begin_(nullptr),
 __size_(0),
 __cap_alloc_(0, __a)
{
 if (__a == allocator_type(__v.__alloc()))
 {
 this->__begin_ = __v.__begin_;
 this->__size_ = __v.__size_;
 this->__cap() = __v.__cap();
 __v.__begin_ = nullptr;
 __v.__cap() = __v.__size_ = 0;
 }
 else if (__v.size() > 0)
 {
 allocate(__v.size());
 __construct_at_end(__v.begin(), __v.end());
 }
}

template <class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
vector<bool, _Allocator>&
vector<bool, _Allocator>::operator=(vector&& __v)
 _NOEXCEPT_(
 __alloc_traits::propagate_on_container_move_assignment::value &&
 is_nothrow_move_assignable<allocator_type>::value)
{
 __move_assign(__v, integral_constant<bool,
 __storage_traits::propagate_on_container_move_assignment::value>());
 return *this;
}

template <class _Allocator>
void
vector<bool, _Allocator>::__move_assign(vector& __c, false_type)
{
 if (__alloc() != __c.__alloc())
 assign(__c.begin(), __c.end());
 else
 __move_assign(__c, true_type());
}

template <class _Allocator>
void
vector<bool, _Allocator>::__move_assign(vector& __c, true_type)
 _NOEXCEPT_(is_nothrow_move_assignable<allocator_type>::value)
{
 deallocate();
 __move_assign_alloc(__c);
 this->__begin_ = __c.__begin_;
 this->__size_ = __c.__size_;
 this->__cap() = __c.__cap();
 __c.__begin_ = nullptr;
 __c.__cap() = __c.__size_ = 0;
}

#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES

template <class _Allocator>
void
vector<bool, _Allocator>::assign(size_type __n, const value_type& __x)
{
 __size_ = 0;
 if (__n > 0)
 {
 size_type __c = capacity();
 if (__n <= __c)
 __size_ = __n;
 else
 {
 vector __v(__alloc());
 __v.reserve(__recommend(__n));
 __v.__size_ = __n;
 swap(__v);
 }
 _VSTD::fill_n(begin(), __n, __x);
 }
}

template <class _Allocator>
template <class _InputIterator>
typename enable_if
<
 __is_input_iterator<_InputIterator>::value &&
 !__is_forward_iterator<_InputIterator>::value,
 void
>::type
vector<bool, _Allocator>::assign(_InputIterator __first, _InputIterator __last)
{
 clear();
 for (; __first != __last; ++__first)
 push_back(*__first);
}

template <class _Allocator>
template <class _ForwardIterator>
typename enable_if
<
 __is_forward_iterator<_ForwardIterator>::value,
 void
>::type
vector<bool, _Allocator>::assign(_ForwardIterator __first, _ForwardIterator __last)
{
 clear();
 difference_type __n = _VSTD::distance(__first, __last);
 if (__n)
 {
 if (__n > capacity())
 {
 deallocate();
 allocate(__n);
 }
 __construct_at_end(__first, __last);
 }
}

template <class _Allocator>
void
vector<bool, _Allocator>::reserve(size_type __n)
{
 if (__n > capacity())
 {
 vector __v(this->__alloc());
 __v.allocate(__n);
 __v.__construct_at_end(this->begin(), this->end());
 swap(__v);
 __invalidate_all_iterators();
 }
}

template <class _Allocator>
void
vector<bool, _Allocator>::shrink_to_fit() _NOEXCEPT
{
 if (__external_cap_to_internal(size()) > __cap())
 {
#ifndef _LIBCPP_NO_EXCEPTIONS
 try
 {
#endif // _LIBCPP_NO_EXCEPTIONS
 vector(*this, allocator_type(__alloc())).swap(*this);
#ifndef _LIBCPP_NO_EXCEPTIONS
 }
 catch (...)
 {
 }
#endif // _LIBCPP_NO_EXCEPTIONS
 }
}

template <class _Allocator>
typename vector<bool, _Allocator>::reference
vector<bool, _Allocator>::at(size_type __n)
{
 if (__n >= size())
 this->__throw_out_of_range();
 return (*this)[__n];
}

template <class _Allocator>
typename vector<bool, _Allocator>::const_reference
vector<bool, _Allocator>::at(size_type __n) const
{
 if (__n >= size())
 this->__throw_out_of_range();
 return (*this)[__n];
}

template <class _Allocator>
void
vector<bool, _Allocator>::push_back(const value_type& __x)
{
 if (this->__size_ == this->capacity())
 reserve(__recommend(this->__size_ + 1));
 ++this->__size_;
 back() = __x;
}

template <class _Allocator>
typename vector<bool, _Allocator>::iterator
vector<bool, _Allocator>::insert(const_iterator __position, const value_type& __x)
{
 iterator __r;
 if (size() < capacity())
 {
 const_iterator __old_end = end();
 ++__size_;
 _VSTD::copy_backward(__position, __old_end, end());
 __r = __const_iterator_cast(__position);
 }
 else
 {
 vector __v(__alloc());
 __v.reserve(__recommend(__size_ + 1));
 __v.__size_ = __size_ + 1;
 __r = _VSTD::copy(cbegin(), __position, __v.begin());
 _VSTD::copy_backward(__position, cend(), __v.end());
 swap(__v);
 }
 *__r = __x;
 return __r;
}

template <class _Allocator>
typename vector<bool, _Allocator>::iterator
vector<bool, _Allocator>::insert(const_iterator __position, size_type __n, const value_type& __x)
{
 iterator __r;
 size_type __c = capacity();
 if (__n <= __c && size() <= __c - __n)
 {
 const_iterator __old_end = end();
 __size_ += __n;
 _VSTD::copy_backward(__position, __old_end, end());
 __r = __const_iterator_cast(__position);
 }
 else
 {
 vector __v(__alloc());
 __v.reserve(__recommend(__size_ + __n));
 __v.__size_ = __size_ + __n;
 __r = _VSTD::copy(cbegin(), __position, __v.begin());
 _VSTD::copy_backward(__position, cend(), __v.end());
 swap(__v);
 }
 _VSTD::fill_n(__r, __n, __x);
 return __r;
}

template <class _Allocator>
template <class _InputIterator>
typename enable_if
<
 __is_input_iterator <_InputIterator>::value &&
 !__is_forward_iterator<_InputIterator>::value,
 typename vector<bool, _Allocator>::iterator
>::type
vector<bool, _Allocator>::insert(const_iterator __position, _InputIterator __first, _InputIterator __last)
{
 difference_type __off = __position - begin();
 iterator __p = __const_iterator_cast(__position);
 iterator __old_end = end();
 for (; size() != capacity() && __first != __last; ++__first)
 {
 ++this->__size_;
 back() = *__first;
 }
 vector __v(__alloc());
 if (__first != __last)
 {
#ifndef _LIBCPP_NO_EXCEPTIONS
 try
 {
#endif // _LIBCPP_NO_EXCEPTIONS
 __v.assign(__first, __last);
 difference_type __old_size = static_cast<difference_type>(__old_end - begin());
 difference_type __old_p = __p - begin();
 reserve(__recommend(size() + __v.size()));
 __p = begin() + __old_p;
 __old_end = begin() + __old_size;
#ifndef _LIBCPP_NO_EXCEPTIONS
 }
 catch (...)
 {
 erase(__old_end, end());
 throw;
 }
#endif // _LIBCPP_NO_EXCEPTIONS
 }
 __p = _VSTD::rotate(__p, __old_end, end());
 insert(__p, __v.begin(), __v.end());
 return begin() + __off;
}

template <class _Allocator>
template <class _ForwardIterator>
typename enable_if
<
 __is_forward_iterator<_ForwardIterator>::value,
 typename vector<bool, _Allocator>::iterator
>::type
vector<bool, _Allocator>::insert(const_iterator __position, _ForwardIterator __first, _ForwardIterator __last)
{
 difference_type __n = _VSTD::distance(__first, __last);
 iterator __r;
 size_type __c = capacity();
 if (__n <= __c && size() <= __c - __n)
 {
 const_iterator __old_end = end();
 __size_ += __n;
 _VSTD::copy_backward(__position, __old_end, end());
 __r = __const_iterator_cast(__position);
 }
 else
 {
 vector __v(__alloc());
 __v.reserve(__recommend(__size_ + __n));
 __v.__size_ = __size_ + __n;
 __r = _VSTD::copy(cbegin(), __position, __v.begin());
 _VSTD::copy_backward(__position, cend(), __v.end());
 swap(__v);
 }
 _VSTD::copy(__first, __last, __r);
 return __r;
}

template <class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
typename vector<bool, _Allocator>::iterator
vector<bool, _Allocator>::erase(const_iterator __position)
{
 iterator __r = __const_iterator_cast(__position);
 _VSTD::copy(__position + 1, this->cend(), __r);
 --__size_;
 return __r;
}

template <class _Allocator>
typename vector<bool, _Allocator>::iterator
vector<bool, _Allocator>::erase(const_iterator __first, const_iterator __last)
{
 iterator __r = __const_iterator_cast(__first);
 difference_type __d = __last - __first;
 _VSTD::copy(__last, this->cend(), __r);
 __size_ -= __d;
 return __r;
}

template <class _Allocator>
void
vector<bool, _Allocator>::swap(vector& __x)
#if _LIBCPP_STD_VER >= 14
 _NOEXCEPT
#else
 _NOEXCEPT_(!__alloc_traits::propagate_on_container_swap::value || 
 __is_nothrow_swappable<allocator_type>::value)
#endif
{
 _VSTD::swap(this->__begin_, __x.__begin_);
 _VSTD::swap(this->__size_, __x.__size_);
 _VSTD::swap(this->__cap(), __x.__cap());
 __swap_allocator(this->__alloc(), __x.__alloc(), 
 integral_constant<bool, __alloc_traits::propagate_on_container_swap::value>());
}

template <class _Allocator>
void
vector<bool, _Allocator>::resize(size_type __sz, value_type __x)
{
 size_type __cs = size();
 if (__cs < __sz)
 {
 iterator __r;
 size_type __c = capacity();
 size_type __n = __sz - __cs;
 if (__n <= __c && __cs <= __c - __n)
 {
 __r = end();
 __size_ += __n;
 }
 else
 {
 vector __v(__alloc());
 __v.reserve(__recommend(__size_ + __n));
 __v.__size_ = __size_ + __n;
 __r = _VSTD::copy(cbegin(), cend(), __v.begin());
 swap(__v);
 }
 _VSTD::fill_n(__r, __n, __x);
 }
 else
 __size_ = __sz;
}

template <class _Allocator>
void
vector<bool, _Allocator>::flip() _NOEXCEPT
{
 // do middle whole words
 size_type __n = __size_;
 __storage_pointer __p = __begin_;
 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 <class _Allocator>
bool
vector<bool, _Allocator>::__invariants() const
{
 if (this->__begin_ == nullptr)
 {
 if (this->__size_ != 0 || this->__cap() != 0)
 return false;
 }
 else
 {
 if (this->__cap() == 0)
 return false;
 if (this->__size_ > this->capacity())
 return false;
 }
 return true;
}

template <class _Allocator>
size_t
vector<bool, _Allocator>::__hash_code() const _NOEXCEPT
{
 size_t __h = 0;
 // do middle whole words
 size_type __n = __size_;
 __storage_pointer __p = __begin_;
 for (; __n >= __bits_per_word; ++__p, __n -= __bits_per_word)
 __h ^= *__p;
 // do last partial word
 if (__n > 0)
 {
 const __storage_type __m = ~__storage_type(0) >> (__bits_per_word - __n);
 __h ^= *__p & __m;
 }
 return __h;
}

template <class _Allocator>
struct _LIBCPP_TYPE_VIS_ONLY hash<vector<bool, _Allocator> >
 : public unary_function<vector<bool, _Allocator>, size_t>
{
 _LIBCPP_INLINE_VISIBILITY
 size_t operator()(const vector<bool, _Allocator>& __vec) const _NOEXCEPT
 {return __vec.__hash_code();}
};

template <class _Tp, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator==(const vector<_Tp, _Allocator>& __x, const vector<_Tp, _Allocator>& __y)
{
 const typename vector<_Tp, _Allocator>::size_type __sz = __x.size();
 return __sz == __y.size() && _VSTD::equal(__x.begin(), __x.end(), __y.begin());
}

template <class _Tp, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator!=(const vector<_Tp, _Allocator>& __x, const vector<_Tp, _Allocator>& __y)
{
 return !(__x == __y);
}

template <class _Tp, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator< (const vector<_Tp, _Allocator>& __x, const vector<_Tp, _Allocator>& __y)
{
 return _VSTD::lexicographical_compare(__x.begin(), __x.end(), __y.begin(), __y.end());
}

template <class _Tp, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator> (const vector<_Tp, _Allocator>& __x, const vector<_Tp, _Allocator>& __y)
{
 return __y < __x;
}

template <class _Tp, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator>=(const vector<_Tp, _Allocator>& __x, const vector<_Tp, _Allocator>& __y)
{
 return !(__x < __y);
}

template <class _Tp, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator<=(const vector<_Tp, _Allocator>& __x, const vector<_Tp, _Allocator>& __y)
{
 return !(__y < __x);
}

template <class _Tp, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
void
swap(vector<_Tp, _Allocator>& __x, vector<_Tp, _Allocator>& __y)
 _NOEXCEPT_(_NOEXCEPT_(__x.swap(__y)))
{
 __x.swap(__y);
}

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP_VECTOR