26 Containers library [containers]

#include <initializer_list>

namespace std {
  // [deque], class template deque
  template <class T, class Allocator = allocator<T>> class deque;
  template <class T, class Allocator>
    bool operator==(const deque<T, Allocator>& x, const deque<T, Allocator>& y);
  template <class T, class Allocator>
    bool operator< (const deque<T, Allocator>& x, const deque<T, Allocator>& y);
  template <class T, class Allocator>
    bool operator!=(const deque<T, Allocator>& x, const deque<T, Allocator>& y);
  template <class T, class Allocator>
    bool operator> (const deque<T, Allocator>& x, const deque<T, Allocator>& y);
  template <class T, class Allocator>
    bool operator>=(const deque<T, Allocator>& x, const deque<T, Allocator>& y);
  template <class T, class Allocator>
    bool operator<=(const deque<T, Allocator>& x, const deque<T, Allocator>& y);
  template <class T, class Allocator>
    void swap(deque<T, Allocator>& x, deque<T, Allocator>& y)
      noexcept(noexcept(x.swap(y)));

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