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Showing content from https://cplusplus.github.io/LWG/issue3506 below:

Missing allocator-extended constructors for priority_queue

Modify 23.6.4 [priority.queue], class template priority_queue synopsis, as indicated:

namespace std {
  template<class T, class Container = vector<T>,
            class Compare = less<typename Container::value_type>>
  class priority_queue {

  // […]

  public:
    priority_queue() : priority_queue(Compare()) {}
    explicit priority_queue(const Compare& x) : priority_queue(x, Container()) {}
    priority_queue(const Compare& x, const Container&);
    priority_queue(const Compare& x, Container&&);
    template<class InputIterator>
      priority_queue(InputIterator first, InputIterator last, const Compare& x,
                      const Container&);
    template<class InputIterator>
      priority_queue(InputIterator first, InputIterator last,
                      const Compare& x = Compare(), Container&& = Container());
    template<class Alloc> explicit priority_queue(const Alloc&);
    template<class Alloc> priority_queue(const Compare&, const Alloc&);
    template<class Alloc> priority_queue(const Compare&, const Container&, const Alloc&);
    template<class Alloc> priority_queue(const Compare&, Container&&, const Alloc&);
    template<class Alloc> priority_queue(const priority_queue&, const Alloc&);
    template<class Alloc> priority_queue(priority_queue&&, const Alloc&);
    template<class InputIterator, class Alloc>
      priority_queue(InputIterator, InputIterator, const Alloc&);
    template<class InputIterator, class Alloc>
      priority_queue(InputIterator, InputIterator, const Compare&, const Alloc&);
    template<class InputIterator, class Alloc>
      priority_queue(InputIterator, InputIterator, const Compare&, const Container&, const Alloc&);
    template<class InputIterator, class Alloc>
      priority_queue(InputIterator, InputIterator, const Compare&, Container&&, const Alloc&);

  // […]

  };

  template<class Compare, class Container>
    priority_queue(Compare, Container)
      -> priority_queue<typename Container::value_type, Container, Compare>;

  template<class InputIterator,
            class Compare = less<typename iterator_traitsiter-value-type<InputIterator>::value_type>,
            class Container = vector<typename iterator_traitsiter-value-type<InputIterator>::value_type>>
    priority_queue(InputIterator, InputIterator, Compare = Compare(), Container = Container())
      -> priority_queue<typename iterator_traitsiter-value-type<InputIterator>::value_type, Container, Compare>;

  template<class Compare, class Container, class Allocator>
    priority_queue(Compare, Container, Allocator)
      -> priority_queue<typename Container::value_type, Container, Compare>;

  template<class InputIterator, class Allocator>
    priority_queue(InputIterator, InputIterator, Allocator)
      -> priority_queue<iter-value-type<InputIterator>,
                        vector<iter-value-type<InputIterator>, Allocator>,
                        less<iter-value-type<InputIterator>>>;

  template<class InputIterator, class Compare, class Allocator>
    priority_queue(InputIterator, InputIterator, Compare, Allocator)
      -> priority_queue<iter-value-type<InputIterator>,
                        vector<iter-value-type<InputIterator>, Allocator>, Compare>;

  template<class InputIterator, class Compare, class Container, class Allocator>
    priority_queue(InputIterator, InputIterator, Compare, Container, Allocator)
      -> priority_queue<typename Container::value_type, Container, Compare>;

  // […]
}

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