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Standard library header <set>

This header is part of the containers library.

Includes

<initializer_list> (C++11)

Classes

collection of unique keys, sorted by keys
(class template)
collection of keys, sorted by keys
(class template)

Functions

lexicographically compares the values in the set
(function template)
specializes the std::swap algorithm
(function template)
lexicographically compares the values in the multiset
(function template)
specializes the std::swap algorithm
(function template)

Synopsis

#include <initializer_list>
 
namespace std
{
    template <class Key, class Compare = less<Key>,
              class Allocator = allocator<Key> >
        class set;
 
    template <class Key, class Compare, class Allocator>
        bool operator==(const set<Key,Compare,Allocator>& x,
                        const set<Key,Compare,Allocator>& y);
    template <class Key, class Compare, class Allocator>
        bool operator< (const set<Key,Compare,Allocator>& x,
                        const set<Key,Compare,Allocator>& y);
    template <class Key, class Compare, class Allocator>
        bool operator!=(const set<Key,Compare,Allocator>& x,
                        const set<Key,Compare,Allocator>& y);
    template <class Key, class Compare, class Allocator>
        bool operator> (const set<Key,Compare,Allocator>& x,
                        const set<Key,Compare,Allocator>& y);
    template <class Key, class Compare, class Allocator>
        bool operator>=(const set<Key,Compare,Allocator>& x,
                        const set<Key,Compare,Allocator>& y);
    template <class Key, class Compare, class Allocator>
        bool operator<=(const set<Key,Compare,Allocator>& x,
                        const set<Key,Compare,Allocator>& y);
 
    template <class Key, class Compare, class Allocator>
        void swap(set<Key,Compare,Allocator>& x,
                  set<Key,Compare,Allocator>& y);
 
    template <class Key, class Compare = less<Key>,
             class Allocator = allocator<Key> >
        class multiset;
 
    template <class Key, class Compare, class Allocator>
        bool operator==(const multiset<Key,Compare,Allocator>&
                        const multiset<Key,Compare,Allocator>& y);
    template <class Key, class Compare, class Allocator>
        bool operator< (const multiset<Key,Compare,Allocator>& x,
                        const multiset<Key,Compare,Allocator>& y);
    template <class Key, class Compare, class Allocator>
        bool operator!=(const multiset<Key,Compare,Allocator>& x,
                        const multiset<Key,Compare,Allocator>& y);
    template <class Key, class Compare, class Allocator>
        bool operator> (const multiset<Key,Compare,Allocator>& x,
                        const multiset<Key,Compare,Allocator>& y);
    template <class Key, class Compare, class Allocator>
        bool operator>=(const multiset<Key,Compare,Allocator>& x,
                        const multiset<Key,Compare,Allocator>& y);
    template <class Key, class Compare, class Allocator>
        bool operator<=(const multiset<Key,Compare,Allocator>& x,
                        const multiset<Key,Compare,Allocator>& y);
 
    template <class Key, class Compare, class Allocator>
        void swap(multiset<Key,Compare,Allocator>& x,
                  multiset<Key,Compare,Allocator>& y);
}

Class std::set

template <class Key, class Compare = less<Key>,
class Allocator = allocator<Key> >
class set
{
public:
    // types:
    typedef Key key_type;
    typedef Key value_type;
    typedef Compare key_compare;
    typedef Compare value_compare;
    typedef Allocator allocator_type;
    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 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 set(const Compare& comp = Compare(),
                 const Allocator& = Allocator());
    template <class InputIterator>
    set(InputIterator first, InputIterator last,
        const Compare& comp = Compare(), const Allocator& = Allocator());
    set(const set<Key,Compare,Allocator>& x);
    set(set<Key,Compare,Allocator>&& x);
    explicit set(const Allocator&);
    set(const set&, const Allocator&);
    set(set&&, const Allocator&);
    set(initializer_list<value_type>,
        const Compare& = Compare(),
        const Allocator& = Allocator());
    ~set();
 
    set<Key,Compare,Allocator>& operator= (const set<Key,Compare,Allocator>& x);
    set<Key,Compare,Allocator>& operator= (set<Key,Compare,Allocator>&& x);
    set& operator=(initializer_list<value_type>);
    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:
    bool        empty() const noexcept;
    size_type   size() const noexcept;
    size_type   max_size() const noexcept;
 
    // modifiers:
    template <class... Args> pair<iterator, bool> emplace(Args&&... args);
    template <class... Args> 
        iterator emplace_hint(const_iterator position, Args&&... args);
 
    pair<iterator,bool> insert(const value_type& x);
    pair<iterator,bool> insert(value_type&& x);
    iterator insert(const_iterator position, const value_type& x);
    iterator insert(const_iterator position, value_type&& x);
    template <class InputIterator>
    void insert(InputIterator first, InputIterator last);
    void insert(initializer_list<value_type>);
 
    iterator erase(const_iterator position);
    size_type erase(const key_type& x);
    iterator erase(const_iterator first, const_iterator last);
 
    void swap(set<Key,Compare,Allocator>&);
    void clear() noexcept;
 
    // observers:
    key_compare   key_comp() const;
    value_compare value_comp() const;
 
    // set operations:
    iterator       find(const key_type& x);
    const_iterator find(const key_type& x) const;
    size_type      count(const key_type& x) const;
    iterator       lower_bound(const key_type& x);
    const_iterator lower_bound(const key_type& x) const;
    iterator       upper_bound(const key_type& x);
    const_iterator upper_bound(const key_type& x) const;
    pair<iterator,iterator> equal_range(const key_type& x);
    pair<const_iterator,const_iterator> equal_range(const key_type& x) const;
};

Class std::multiset

template <class Key, class Compare = less<Key>,
class Allocator = allocator<Key> >
class multiset
{
public:
    // types:
    typedef Key key_type;
    typedef Key value_type;
    typedef Compare key_compare;
    typedef Compare value_compare;
    typedef Allocator allocator_type;
    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 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 multiset(const Compare& comp = Compare(),
                 const Allocator& = Allocator());
    template <class InputIterator>
    multiset(InputIterator first, InputIterator last,
        const Compare& comp = Compare(), const Allocator& = Allocator());
    multiset(const multiset<Key,Compare,Allocator>& x);
    multiset(multiset<Key,Compare,Allocator>&& x);
    explicit multiset(const Allocator&);
    multiset(const multiset&, const Allocator&);
    multiset(multiset&&, const Allocator&);
    multiset(initializer_list<value_type>,
        const Compare& = Compare(),
        const Allocator& = Allocator());
    ~multiset();
 
    multiset<Key,Compare,Allocator>& operator= (const multiset<Key,Compare,Allocator>& x);
    multiset<Key,Compare,Allocator>& operator= (multiset<Key,Compare,Allocator>&& x);
    multiset& operator=(initializer_list<value_type>);
    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:
    bool        empty() const noexcept;
    size_type   size() const noexcept;
    size_type   max_size() const noexcept;
 
    // modifiers:
    template <class... Args> pair<iterator, bool> emplace(Args&&... args);
    template <class... Args> 
        iterator emplace_hint(const_iterator position, Args&&... args);
 
    pair<iterator,bool> insert(const value_type& x);
    pair<iterator,bool> insert(value_type&& x);
    iterator insert(const_iterator position, const value_type& x);
    iterator insert(const_iterator position, value_type&& x);
    template <class InputIterator>
    void insert(InputIterator first, InputIterator last);
    void insert(initializer_list<value_type>);
 
    iterator erase(const_iterator position);
    size_type erase(const key_type& x);
    iterator erase(const_iterator first, const_iterator last);
 
    void swap(multiset<Key,Compare,Allocator>&);
    void clear() noexcept;
 
    // observers:
    key_compare   key_comp() const;
    value_compare value_comp() const;
 
    // multiset operations:
    iterator       find(const key_type& x);
    const_iterator find(const key_type& x) const;
    size_type      count(const key_type& x) const;
    iterator       lower_bound(const key_type& x);
    const_iterator lower_bound(const key_type& x) const;
    iterator       upper_bound(const key_type& x);
    const_iterator upper_bound(const key_type& x) const;
    pair<iterator,iterator> equal_range(const key_type& x);
    pair<const_iterator,const_iterator> equal_range(const key_type& x) const;
};

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