Standard library header <vector>

#include <compare>
#include <initializer_list>
namespace std {
  // 类模板 vector
  template<class T, class Allocator = allocator<T>>
  class vector;
  template<class T, class Allocator>
  constexpr bool operator==(const vector<T, Allocator>& x, const vector<T, Allocator>& y);
  template<class T, class Allocator>
  constexpr /*synth-three-way-result*/<T> operator<=>(const vector<T, Allocator>& x,
                                                      const vector<T, Allocator>& y);
  template<class T, class Allocator>
  constexpr void swap(vector<T, Allocator>& x,
                      vector<T, Allocator>& y) noexcept(noexcept(x.swap(y)));
  // 擦除
  template<class T, class Allocator, class U = T>
  constexpr typename vector<T, Allocator>::size_type erase(vector<T, Allocator>& c,
                                                           const U& value);
  template<class T, class Allocator, class Predicate>
  constexpr typename vector<T, Allocator>::size_type erase_if(vector<T, Allocator>& c,
                                                              Predicate pred);
  namespace pmr {
    template<class T>
    using vector = std::vector<T, polymorphic_allocator<T>>;
  }
  // bool 类型的 vector 特化
  // 部分类模板特化 vector<bool, Allocator>
  template<class Allocator>
  class vector<bool, Allocator>;
  template<class T>
  constexpr bool /*is-vector-bool-reference*/ = /* 见描述 */; // 仅用于说明
  // 哈希支持
  template<class T>
  struct hash;
  template<class Allocator>
  struct hash<vector<bool, Allocator>>;
  // vector<bool> 的格式化器特化
  template<class T, class CharT>
    requires /*is-vector-bool-reference*/<T>
  struct formatter<T, CharT>;
}

namespace std {
  template<class T, class Allocator = allocator<T>>
  class vector
  {
  public:
    // 类型定义
    using value_type             = T;
    using allocator_type         = Allocator;
    using pointer                = typename allocator_traits<Allocator>::pointer;
    using const_pointer          = typename allocator_traits<Allocator>::const_pointer;
    using reference              = value_type&;
    using const_reference        = const value_type&;
    using size_type              = /* 实现定义 */;
    using difference_type        = /* 实现定义 */;
    using iterator               = /* 实现定义 */;
    using const_iterator         = /* 实现定义 */;
    using reverse_iterator       = std::reverse_iterator<iterator>;
    using const_reverse_iterator = std::reverse_iterator<const_iterator>;
    // 构造/复制/销毁
    constexpr vector() noexcept(noexcept(Allocator()))
      : vector(Allocator())
    {
    }
    constexpr explicit vector(const Allocator&) noexcept;
    constexpr explicit vector(size_type n, const Allocator& = Allocator());
    constexpr vector(size_type n, const T& value, const Allocator& = Allocator());
    template<class InputIter>
    constexpr vector(InputIter first, InputIter last, const Allocator& = Allocator());
    template<container-compatible-range<T> R>
    constexpr vector(from_range_t, R&& rg, const Allocator& = Allocator());
    constexpr vector(const vector& x);
    constexpr vector(vector&&) noexcept;
    constexpr vector(const vector&, const type_identity_t<Allocator>&);
    constexpr vector(vector&&, const type_identity_t<Allocator>&);
    constexpr vector(initializer_list<T>, const Allocator& = Allocator());
    constexpr ~vector();
    constexpr vector& operator=(const vector& x);
    constexpr vector& operator=(vector&& x) noexcept(
      allocator_traits<Allocator>::propagate_on_container_move_assignment::value ||
      allocator_traits<Allocator>::is_always_equal::value);
    constexpr vector& operator=(initializer_list<T>);
    template<class InputIter>
    constexpr void assign(InputIter first, InputIter last);
    template<container-compatible-range<T> R>
    constexpr void assign_range(R&& rg);
    constexpr void assign(size_type n, const T& u);
    constexpr void assign(initializer_list<T>);
    constexpr allocator_type get_allocator() const noexcept;
    // 迭代器
    constexpr iterator begin() noexcept;
    constexpr const_iterator begin() const noexcept;
    constexpr iterator end() noexcept;
    constexpr const_iterator end() const noexcept;
    constexpr reverse_iterator rbegin() noexcept;
    constexpr const_reverse_iterator rbegin() const noexcept;
    constexpr reverse_iterator rend() noexcept;
    constexpr const_reverse_iterator rend() const noexcept;
    constexpr const_iterator cbegin() const noexcept;
    constexpr const_iterator cend() const noexcept;
    constexpr const_reverse_iterator crbegin() const noexcept;
    constexpr const_reverse_iterator crend() const noexcept;
    // 容量
    constexpr bool empty<span class="br

namespace std {
  template<class Allocator>
  class vector<bool, Allocator>
  {
  public:
    // 类型定义
    using value_type             = bool;
    using allocator_type         = Allocator;
    using pointer                = /* 实现定义 */;
    using const_pointer          = /* 实现定义 */;
    using const_reference        = bool;
    using size_type              = /* 实现定义 */;
    using difference_type        = /* 实现定义 */;
    using iterator               = /* 实现定义 */;
    using const_iterator         = /* 实现定义 */;
    using reverse_iterator       = std::reverse_iterator<iterator>;
    using const_reverse_iterator = std::reverse_iterator<const_iterator>;
    // 位引用
    class reference
    {
    public:
      constexpr reference(const reference&) = default;
      constexpr ~reference();
      constexpr operator bool() const noexcept;
      constexpr reference& operator=(bool x) noexcept;
      constexpr reference& operator=(const reference& x) noexcept;
      constexpr const reference& operator=(bool x) const noexcept;
      constexpr void flip() noexcept; // 翻转位
    };
    // 构造/复制/销毁
    constexpr vector() noexcept(noexcept(Allocator()))
      : vector(Allocator())
    {
    }
    constexpr explicit vector(const Allocator&) noexcept;
    constexpr explicit vector(size_type n, const Allocator& = Allocator());
    constexpr vector(size_type n, const bool& value, const Allocator& = Allocator());
    template<class InputIter>
    constexpr vector(InputIter first, InputIter last, const Allocator& = Allocator());
    template<container-compatible-range<bool> R>
    constexpr vector(from_range_t, R&& rg, const Allocator& = Allocator());
    constexpr vector(const vector& x);
    constexpr vector(vector&& x) noexcept;
    constexpr vector(const vector&, const type_identity_t<Allocator>&);
    constexpr vector(vector&&, const type_identity_t<Allocator>&);
    constexpr vector(initializer_list<bool>, const Allocator& = Allocator());
    constexpr ~vector();
    constexpr vector& operator=(const vector& x);
    constexpr vector& operator=(vector&& x) noexcept(
      allocator_traits<Allocator>::propagate_on_container_move_assignment::value ||
      allocator_traits<Allocator>::is_always_equal::value);
    constexpr vector& operator=(initializer_list<bool>);
    template<class InputIter>
    constexpr void assign(InputIter first, InputIter last);
    template<container-compatible-range<bool> R>
    constexpr void assign_range(R&& rg);
    constexpr void assign(size_type n, const bool& t);
    constexpr void assign(initializer_list<bool>);
    constexpr allocator_type get_allocator() const noexcept;
    // 迭代器
    constexpr iterator begin() noexcept;
    constexpr const_iterator begin() const noexcept;
    constexpr iterator end() noexcept;
    constexpr const_iterator end() const <span class="kw

namespace std {
  template<class T, class CharT>
    requires /*is-vector-bool-reference*/<T>
  struct formatter<T, CharT>
  {
  private:
    formatter<bool, CharT> /*underlying_*/; // 仅用于说明
  public:
    template<class ParseContext>
    constexpr typename ParseContext::iterator parse(ParseContext& ctx);
    template<class FormatContext>
    typename FormatContext::iterator format(const T& ref, FormatContext& ctx) const;
  };
}