# Standard library header <vector>

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< cpp‎ | header

This header is part of the containers library.

### Includes

`<initializer_list>` (C++11)

### Classes

vector | dynamic contiguous array (class template)
vector<bool> | space-efficient dynamic bitset (class template specialization)
std::hash<std::vector<bool>> (C++11) | hash support for std::vector <bool> (class template specialization)

### Functions

operator==operator!=operator<operator<=operator>operator>= | lexicographically compares the values in the vector (function template)
std::swap(std::vector) | specializes the std::swap algorithm (function template)

### Synopsis

    #include <initializer_list>
    namespace std {
        template <class T, class Allocator = allocator<T> > class vector;

        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)));

        template <class T, class Allocator, class U>
            void erase(vector<T, Allocator>& c, const U& value);
        template <class T, class Allocator, class Predicate>
            void erase_if(vector<T, Allocator>& c, Predicate pred);

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

        // hash support
        template <class T> struct hash;
        template <class Allocator> struct hash<vector<bool, Allocator> >;

        namespace pmr {
            template<class T>
                using vector = std::vector<T, polymorphic_allocator<T>>;
        }
    }

#### Class std::vector

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

        // construct/copy/destroy:
        explicit vector(const Allocator& = Allocator());
        explicit vector(size_type n);
        vector(size_type n, const T& value,const Allocator& = Allocator());
        template <class InputIt>
            vector(InputIt first, InputIt last,const Allocator& = Allocator());
        vector(const vector<T,Allocator>& x);
        vector(vector&&);
        vector(const vector&, const Allocator&);
        vector(vector&&, const Allocator&);
        vector(initializer_list<T>, const Allocator& = Allocator());

        ~vector();
        vector<T,Allocator>& operator=(const vector<T,Allocator>& x);
        vector<T,Allocator>& operator=(vector<T,Allocator>&& x);
        vector& operator=(initializer_list<T>);
        template <class InputIt>
            void assign(InputIt first, InputIt last);
        void assign(size_type n, const T& t);
        void assign(initializer_list<T>);
        allocator_type get_allocator() const noexcept;

        // iterators:
        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;

        // capacity:
        size_type size() const noexcept;
        size_type max_size() const noexcept;
        void      resize(size_type sz);
        void      resize(size_type sz, const T& c);
        size_type capacity() const noexcept;
        [[nodiscard]] bool empty() const noexcept;
        void      reserve(size_type n);
        void      shrink_to_fit();

        // element access:
        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;

        // data access
        T*       data() noexcept;
        const T* data() const noexcept;

        // modifiers:
        template <class... Args> void emplace_back(Args&&... args);
        void push_back(const T& x);
        void push_back(T&& x);
        void pop_back();

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

        iterator erase(const_iterator position);
        iterator erase(const_iterator first, const_iterator last);
        void     swap(vector<T,Allocator>&);
        void     clear() noexcept;
    };

    template<class InputIt,
             class Allocator = allocator</*iter-value-type*/<InputIt>>>
        vector(InputIt, InputIt, Allocator = Allocator())
            -> vector</*iter-value-type*/<InputIt>, Allocator>;

#### Specialization std::vector <bool>

    template < class Allocator >
    class vector<bool, Allocator> {
    public:
        // types:
        typedef bool                                                const_reference;
        typedef /*implementation-defined*/                          iterator;
        typedef /*implementation-defined*/                          const_iterator;
        typedef /*implementation-defined*/                          size_type;
        typedef /*implementation-defined*/                          difference_type;
        typedef bool                                                value_type;
        typedef Allocator                                           allocator_type;
        typedef /*implementation-defined*/                          pointer;
        typedef /*implementation-defined*/                          const_pointer;
        typedef std::reverse_iterator<iterator>                     reverse_iterator;
        typedef std::reverse_iterator<const_iterator>               const_reverse_iterator;

        // bit reference:
        class reference {
            friend class vector;
            reference() noexcept;
        public:
            ~reference();
            operator bool() const noexcept;
            reference& operator=(const bool x) noexcept;
            reference& operator=(const reference& x) noexcept;
            void flip() noexcept; // flips the bit
        };

        // construct/copy/destroy:
        explicit vector(const Allocator& = Allocator());
        explicit vector(size_type n);
        vector(size_type n, const bool& value,const Allocator& = Allocator());
        template <class InputIt>
            vector(InputIt first, InputIt last,const Allocator& = Allocator());
        vector(const vector<bool,Allocator>& x);
        vector(vector&&);
        vector(const vector&, const Allocator&);
        vector(vector&&, const Allocator&);
        vector(initializer_list<bool>, const Allocator& = Allocator());

        ~vector();
        vector<bool,Allocator>& operator=(const vector<bool,Allocator>& x);
        vector<bool,Allocator>& operator=(vector<bool,Allocator>&& x);
        vector& operator=(initializer_list<bool>);
        template <class InputIt>
            void assign(InputIt first, InputIt last);
        void assign(size_type n, const bool& t);
        void assign(initializer_list<bool>);
        allocator_type get_allocator() const noexcept;

        // iterators:
        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;

        // capacity:
        size_type size() const noexcept;
        size_type max_size() const noexcept;
        void      resize(size_type sz);
        void      resize(size_type sz, const bool& c);
        size_type capacity() const noexcept;
        [[nodiscard]] bool empty() const noexcept;
        void      reserve(size_type n);
        void      shrink_to_fit();

        // element access:
        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;

        // modifiers:
        template <class... Args> void emplace_back(Args&&... args);
        void push_back(const bool& x);
        void push_back(bool&& x);
        void pop_back();

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

        iterator erase(const_iterator position);
        iterator erase(const_iterator first, const_iterator last);
        void     swap(vector<bool,Allocator>&);
        static void swap(reference x, reference y) noexcept;
        void     flip() noexcept;// flips all bits
        void     clear() noexcept;
    };

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