explicit deque(const Allocator&);
explicit deque(size_type n, const Allocator& = Allocator());
deque(size_type n, const T& value, const Allocator& = Allocator());
template<class InputIterator>
deque(InputIterator first, InputIterator last, const Allocator& = Allocator());
template<container-compatible-range<T> R>
deque(from_range_t, R&& rg, const Allocator& = Allocator());
void resize(size_type sz);
void resize(size_type sz, const T& c);
void shrink_to_fit();
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 InputIterator>
iterator insert(const_iterator position,
InputIterator first, InputIterator last);
template<container-compatible-range<T> R>
iterator insert_range(const_iterator position, R&& rg);
iterator insert(const_iterator position, initializer_list<T>);
template<class... Args> reference emplace_front(Args&&... args);
template<class... Args> reference emplace_back(Args&&... args);
template<class... Args> iterator emplace(const_iterator position, Args&&... args);
void push_front(const T& x);
void push_front(T&& x);
template<container-compatible-range<T> R>
void prepend_range(R&& rg);
void push_back(const T& x);
void push_back(T&& x);
template<container-compatible-range<T> R>
void append_range(R&& rg);
iterator erase(const_iterator position);
iterator erase(const_iterator first, const_iterator last);
void pop_front();
void pop_back();
template<class T, class Allocator, class U>
typename deque<T, Allocator>::size_type
erase(deque<T, Allocator>& c, const U& value);
template<class T, class Allocator, class Predicate>
typename deque<T, Allocator>::size_type
erase_if(deque<T, Allocator>& c, Predicate pred);