libcxx/include/queue

// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP_QUEUE
#define _LIBCPP_QUEUE

/*
    queue synopsis

namespace std
{

template <class T, class Container = deque<T>>
class queue
{
public:
    typedef Container                                container_type;
    typedef typename container_type::value_type      value_type;
    typedef typename container_type::reference       reference;
    typedef typename container_type::const_reference const_reference;
    typedef typename container_type::size_type       size_type;

protected:
    container_type c;

public:
    queue() = default;
    ~queue() = default;

    queue(const queue& q) = default;
    queue(queue&& q) = default;

    queue& operator=(const queue& q) = default;
    queue& operator=(queue&& q) = default;

    explicit queue(const container_type& c);
    explicit queue(container_type&& c)
    template<class InputIterator>
        queue(InputIterator first, InputIterator last); // since C++23
    template<container-compatible-range<T> R> queue(from_range_t, R&& rg); // since C++23
    template <class Alloc>
        explicit queue(const Alloc& a);
    template <class Alloc>
        queue(const container_type& c, const Alloc& a);
    template <class Alloc>
        queue(container_type&& c, const Alloc& a);
    template <class Alloc>
        queue(const queue& q, const Alloc& a);
    template <class Alloc>
        queue(queue&& q, const Alloc& a);
    template <class InputIterator, class Alloc>
        queue(InputIterator first, InputIterator last, const Alloc&); // since C++23
    template<container-compatible-range<T> R, class Alloc>
        queue(from_range_t, R&& rg, const Alloc&); // since C++23

    bool      empty() const;
    size_type size() const;

    reference       front();
    const_reference front() const;
    reference       back();
    const_reference back() const;

    void push(const value_type& v);
    void push(value_type&& v);
    template<container-compatible-range<T> R>
      void push_range(R&& rg); // C++23
    template <class... Args> reference emplace(Args&&... args); // reference in C++17
    void pop();

    void swap(queue& q) noexcept(is_nothrow_swappable_v<Container>)
};

template<class Container>
  queue(Container) -> queue<typename Container::value_type, Container>; // C++17

template<class InputIterator>
  queue(InputIterator, InputIterator) -> queue<iter-value-type<InputIterator>>; // since C++23

template<ranges::input_range R>
  queue(from_range_t, R&&) -> queue<ranges::range_value_t<R>>; // since C++23

template<class Container, class Allocator>
  queue(Container, Allocator) -> queue<typename Container::value_type, Container>; // C++17

template<class InputIterator, class Allocator>
  queue(InputIterator, InputIterator, Allocator)
  -> queue<iter-value-type<InputIterator>,
           deque<iter-value-type<InputIterator>, Allocator>>; // since C++23

template<ranges::input_range R, class Allocator>
    queue(from_range_t, R&&, Allocator)
      -> queue<ranges::range_value_t<R>, deque<ranges::range_value_t<R>, Allocator>>; // since C++23

template <class T, class Container>
  bool operator==(const queue<T, Container>& x,const queue<T, Container>& y);

template <class T, class Container>
  bool operator< (const queue<T, Container>& x,const queue<T, Container>& y);

template <class T, class Container>
  bool operator!=(const queue<T, Container>& x,const queue<T, Container>& y);

template <class T, class Container>
  bool operator> (const queue<T, Container>& x,const queue<T, Container>& y);

template <class T, class Container>
  bool operator>=(const queue<T, Container>& x,const queue<T, Container>& y);

template <class T, class Container>
  bool operator<=(const queue<T, Container>& x,const queue<T, Container>& y);

template<class T, three_way_comparable Container>
  compare_three_way_result_t<Container>
    operator<=>(const queue<T, Container>& x, const queue<T, Container>& y);  // since C++20

template <class T, class Container>
  void swap(queue<T, Container>& x, queue<T, Container>& y)
  noexcept(noexcept(x.swap(y)));

template <class T, class Container = vector<T>,
          class Compare = less<typename Container::value_type>>
class priority_queue
{
public:
    typedef Container                                container_type;
    typedef typename container_type::value_type      value_type;
    typedef typename container_type::reference       reference;
    typedef typename container_type::const_reference const_reference;
    typedef typename container_type::size_type       size_type;

protected:
    container_type c;
    Compare comp;

public:
    priority_queue() : priority_queue(Compare()) {} // C++20
    explicit priority_queue(const Compare& x) : priority_queue(x, Container()) {}
    priority_queue(const Compare& x, const Container&);
    explicit priority_queue(const Compare& x = Compare(), Container&& = Container()); // before C++20
    priority_queue(const Compare& x, Container&&); // C++20
    template <class InputIterator>
        priority_queue(InputIterator first, InputIterator last,
                       const Compare& comp = Compare());
    template <class InputIterator>
        priority_queue(InputIterator first, InputIterator last,
                       const Compare& comp, const Container& c);
    template <class InputIterator>
        priority_queue(InputIterator first, InputIterator last,
                       const Compare& comp, Container&& c);
    template <container-compatible-range<T> R>
        priority_queue(from_range_t, R&& rg, const Compare& x = Compare()); // since C++23
    template <class Alloc>
        explicit priority_queue(const Alloc& a);
    template <class Alloc>
        priority_queue(const Compare& comp, const Alloc& a);
    template <class Alloc>
        priority_queue(const Compare& comp, const Container& c,
                       const Alloc& a);
    template <class Alloc>
        priority_queue(const Compare& comp, Container&& c,
                       const Alloc& a);
    template <class InputIterator>
        priority_queue(InputIterator first, InputIterator last,
                       const Alloc& a);
    template <class InputIterator>
        priority_queue(InputIterator first, InputIterator last,
                       const Compare& comp, const Alloc& a);
    template <class InputIterator>
        priority_queue(InputIterator first, InputIterator last,
                       const Compare& comp, const Container& c, const Alloc& a);
    template <class InputIterator>
        priority_queue(InputIterator first, InputIterator last,
                       const Compare& comp, Container&& c, const Alloc& a);
    template <container-compatible-range<T> R, class Alloc>
      priority_queue(from_range_t, R&& rg, const Compare&, const Alloc&); // since C++23
    template <container-compatible-range<T> R, class Alloc>
      priority_queue(from_range_t, R&& rg, const Alloc&); // since C++23
    template <class Alloc>
        priority_queue(const priority_queue& q, const Alloc& a);
    template <class Alloc>
        priority_queue(priority_queue&& q, const Alloc& a);

    bool            empty() const;
    size_type       size() const;
    const_reference top() const;

    void push(const value_type& v);
    void push(value_type&& v);
    template<container-compatible-range<T> R>
      void push_range(R&& rg); // C++23
    template <class... Args> void emplace(Args&&... args);
    void pop();

    void swap(priority_queue& q)
        noexcept(is_nothrow_swappable_v<Container> &&
                 is_nothrow_swappable_v<Comp>)
};

template <class Compare, class Container>
priority_queue(Compare, Container)
    -> priority_queue<typename Container::value_type, Container, Compare>; // C++17

template<class InputIterator,
         class Compare = less<iter-value-type<InputIterator>>,
         class Container = vector<iter-value-type<InputIterator>>>
priority_queue(InputIterator, InputIterator, Compare = Compare(), Container = Container())
    -> priority_queue<iter-value-type<InputIterator>, Container, Compare>; // C++17

template<ranges::input_range R, class Compare = less<ranges::range_value_t<R>>>
  priority_queue(from_range_t, R&&, Compare = Compare())
    -> priority_queue<ranges::range_value_t<R>, vector<ranges::range_value_t<R>>, Compare>; // C++23

template<class Compare, class Container, class Allocator>
priority_queue(Compare, Container, Allocator)
    -> priority_queue<typename Container::value_type, Container, Compare>; // C++17

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>>>; // C++17

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>; // C++17

template<class InputIterator, class Compare, class Container, class Allocator>
priority_queue(InputIterator, InputIterator, Compare, Container, Allocator)
    -> priority_queue<typename Container::value_type, Container, Compare>; // C++17

template<ranges::input_range R, class Compare, class Allocator>
  priority_queue(from_range_t, R&&, Compare, Allocator)
    -> priority_queue<ranges::range_value_t<R>, vector<ranges::range_value_t<R>, Allocator>,
                        Compare>; // C++23

template<ranges::input_range R, class Allocator>
  priority_queue(from_range_t, R&&, Allocator)
    -> priority_queue<ranges::range_value_t<R>, vector<ranges::range_value_t<R>, Allocator>>; // C++23

template <class T, class Container, class Compare>
  void swap(priority_queue<T, Container, Compare>& x,
            priority_queue<T, Container, Compare>& y)
            noexcept(noexcept(x.swap(y)));

}  // std

*/

#if __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
#  include <__cxx03/queue>
#else
#  include <__algorithm/make_heap.h>
#  include <__algorithm/pop_heap.h>
#  include <__algorithm/push_heap.h>
#  include <__algorithm/ranges_copy.h>
#  include <__config>
#  include <__functional/operations.h>
#  include <__fwd/deque.h>
#  include <__fwd/queue.h>
#  include <__iterator/back_insert_iterator.h>
#  include <__iterator/iterator_traits.h>
#  include <__memory/uses_allocator.h>
#  include <__ranges/access.h>
#  include <__ranges/concepts.h>
#  include <__ranges/container_compatible_range.h>
#  include <__ranges/from_range.h>
#  include <__utility/forward.h>
#  include <deque>
#  include <vector>
#  include <version>

// standard-mandated includes

// [queue.syn]
#  include <compare>
#  include <initializer_list>

#  if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#    pragma GCC system_header
#  endif

_LIBCPP_PUSH_MACROS
#  include <__undef_macros>

_LIBCPP_BEGIN_NAMESPACE_STD

template <class _Tp, class _Container>
_LIBCPP_HIDE_FROM_ABI bool operator==(const queue<_Tp, _Container>& __x, const queue<_Tp, _Container>& __y);

template <class _Tp, class _Container>
_LIBCPP_HIDE_FROM_ABI bool operator<(const queue<_Tp, _Container>& __x, const queue<_Tp, _Container>& __y);

template <class _Tp, class _Container /*= deque<_Tp>*/>
class _LIBCPP_TEMPLATE_VIS queue {
public:
  typedef _Container container_type;
  typedef typename container_type::value_type value_type;
  typedef typename container_type::reference reference;
  typedef typename container_type::const_reference const_reference;
  typedef typename container_type::size_type size_type;
  static_assert(is_same<_Tp, value_type>::value, "");

protected:
  container_type c;

public:
  _LIBCPP_HIDE_FROM_ABI queue() _NOEXCEPT_(is_nothrow_default_constructible<container_type>::value) : c() {}

  _LIBCPP_HIDE_FROM_ABI queue(const queue& __q) : c(__q.c) {}

#  if _LIBCPP_STD_VER >= 23
  template <class _InputIterator, __enable_if_t<__has_input_iterator_category<_InputIterator>::value, int> = 0>
  _LIBCPP_HIDE_FROM_ABI queue(_InputIterator __first, _InputIterator __last) : c(__first, __last) {}

  template <_ContainerCompatibleRange<_Tp> _Range>
  _LIBCPP_HIDE_FROM_ABI queue(from_range_t, _Range&& __range) : c(from_range, std::forward<_Range>(__range)) {}

  template <class _InputIterator,
            class _Alloc,
            __enable_if_t<__has_input_iterator_category<_InputIterator>::value, int> = 0,
            __enable_if_t<uses_allocator<container_type, _Alloc>::value, int>        = 0>
  _LIBCPP_HIDE_FROM_ABI queue(_InputIterator __first, _InputIterator __second, const _Alloc& __alloc)
      : c(__first, __second, __alloc) {}

  template <_ContainerCompatibleRange<_Tp> _Range,
            class _Alloc,
            __enable_if_t<uses_allocator<container_type, _Alloc>::value, int> = 0>
  _LIBCPP_HIDE_FROM_ABI queue(from_range_t, _Range&& __range, const _Alloc& __alloc)
      : c(from_range, std::forward<_Range>(__range), __alloc) {}

#  endif

  _LIBCPP_HIDE_FROM_ABI queue& operator=(const queue& __q) {
    c = __q.c;
    return *this;
  }

#  ifndef _LIBCPP_CXX03_LANG
  _LIBCPP_HIDE_FROM_ABI queue(queue&& __q) noexcept(is_nothrow_move_constructible<container_type>::value)
      : c(std::move(__q.c)) {}

  _LIBCPP_HIDE_FROM_ABI queue& operator=(queue&& __q) noexcept(is_nothrow_move_assignable<container_type>::value) {
    c = std::move(__q.c);
    return *this;
  }
#  endif // _LIBCPP_CXX03_LANG

  _LIBCPP_HIDE_FROM_ABI explicit queue(const container_type& __c) : c(__c) {}
#  ifndef _LIBCPP_CXX03_LANG
  _LIBCPP_HIDE_FROM_ABI explicit queue(container_type&& __c) : c(std::move(__c)) {}
#  endif // _LIBCPP_CXX03_LANG

  template <class _Alloc, __enable_if_t<uses_allocator<container_type, _Alloc>::value, int> = 0>
  _LIBCPP_HIDE_FROM_ABI explicit queue(const _Alloc& __a) : c(__a) {}

  template <class _Alloc, __enable_if_t<uses_allocator<container_type, _Alloc>::value, int> = 0>
  _LIBCPP_HIDE_FROM_ABI queue(const queue& __q, const _Alloc& __a) : c(__q.c, __a) {}

  template <class _Alloc, __enable_if_t<uses_allocator<container_type, _Alloc>::value, int> = 0>
  _LIBCPP_HIDE_FROM_ABI queue(const container_type& __c, const _Alloc& __a) : c(__c, __a) {}

#  ifndef _LIBCPP_CXX03_LANG
  template <class _Alloc, __enable_if_t<uses_allocator<container_type, _Alloc>::value, int> = 0>
  _LIBCPP_HIDE_FROM_ABI queue(container_type&& __c, const _Alloc& __a) : c(std::move(__c), __a) {}

  template <class _Alloc, __enable_if_t<uses_allocator<container_type, _Alloc>::value, int> = 0>
  _LIBCPP_HIDE_FROM_ABI queue(queue&& __q, const _Alloc& __a) : c(std::move(__q.c), __a) {}
#  endif // _LIBCPP_CXX03_LANG

  [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI bool empty() const { return c.empty(); }
  _LIBCPP_HIDE_FROM_ABI size_type size() const { return c.size(); }

  _LIBCPP_HIDE_FROM_ABI reference front() { return c.front(); }
  _LIBCPP_HIDE_FROM_ABI const_reference front() const { return c.front(); }
  _LIBCPP_HIDE_FROM_ABI reference back() { return c.back(); }
  _LIBCPP_HIDE_FROM_ABI const_reference back() const { return c.back(); }

  _LIBCPP_HIDE_FROM_ABI void push(const value_type& __v) { c.push_back(__v); }
#  ifndef _LIBCPP_CXX03_LANG
  _LIBCPP_HIDE_FROM_ABI void push(value_type&& __v) { c.push_back(std::move(__v)); }

#    if _LIBCPP_STD_VER >= 23
  template <_ContainerCompatibleRange<_Tp> _Range>
  _LIBCPP_HIDE_FROM_ABI void push_range(_Range&& __range) {
    if constexpr (requires(container_type& __c) { __c.append_range(std::forward<_Range>(__range)); }) {
      c.append_range(std::forward<_Range>(__range));
    } else {
      ranges::copy(std::forward<_Range>(__range), std::back_inserter(c));
    }
  }
#    endif

  template <class... _Args>
  _LIBCPP_HIDE_FROM_ABI
#    if _LIBCPP_STD_VER >= 17
  decltype(auto)
  emplace(_Args&&... __args) {
    return c.emplace_back(std::forward<_Args>(__args)...);
  }
#    else
  void
  emplace(_Args&&... __args) {
    c.emplace_back(std::forward<_Args>(__args)...);
  }
#    endif
#  endif // _LIBCPP_CXX03_LANG
  _LIBCPP_HIDE_FROM_ABI void pop() { c.pop_front(); }

  _LIBCPP_HIDE_FROM_ABI void swap(queue& __q) _NOEXCEPT_(__is_nothrow_swappable_v<container_type>) {
    using std::swap;
    swap(c, __q.c);
  }

  [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI const _Container& __get_container() const { return c; }

  template <class _T1, class _OtherContainer>
  friend _LIBCPP_HIDE_FROM_ABI bool
  operator==(const queue<_T1, _OtherContainer>& __x, const queue<_T1, _OtherContainer>& __y);

  template <class _T1, class _OtherContainer>
  friend _LIBCPP_HIDE_FROM_ABI bool
  operator<(const queue<_T1, _OtherContainer>& __x, const queue<_T1, _OtherContainer>& __y);
};

#  if _LIBCPP_STD_VER >= 17
template <class _Container, class = enable_if_t<!__is_allocator<_Container>::value> >
queue(_Container) -> queue<typename _Container::value_type, _Container>;

template <class _Container,
          class _Alloc,
          class = enable_if_t<!__is_allocator<_Container>::value>,
          class = enable_if_t<uses_allocator<_Container, _Alloc>::value> >
queue(_Container, _Alloc) -> queue<typename _Container::value_type, _Container>;
#  endif

#  if _LIBCPP_STD_VER >= 23
template <class _InputIterator, __enable_if_t<__has_input_iterator_category<_InputIterator>::value, int> = 0>
queue(_InputIterator, _InputIterator) -> queue<__iter_value_type<_InputIterator>>;

template <ranges::input_range _Range>
queue(from_range_t, _Range&&) -> queue<ranges::range_value_t<_Range>>;

template <class _InputIterator,
          class _Alloc,
          __enable_if_t<__has_input_iterator_category<_InputIterator>::value, int> = 0,
          __enable_if_t<__is_allocator<_Alloc>::value, int>                        = 0>
queue(_InputIterator,
      _InputIterator,
      _Alloc) -> queue<__iter_value_type<_InputIterator>, deque<__iter_value_type<_InputIterator>, _Alloc>>;

template <ranges::input_range _Range, class _Alloc, __enable_if_t<__is_allocator<_Alloc>::value, int> = 0>
queue(from_range_t,
      _Range&&,
      _Alloc) -> queue<ranges::range_value_t<_Range>, deque<ranges::range_value_t<_Range>, _Alloc>>;
#  endif

template <class _Tp, class _Container>
inline _LIBCPP_HIDE_FROM_ABI bool operator==(const queue<_Tp, _Container>& __x, const queue<_Tp, _Container>& __y) {
  return __x.c == __y.c;
}

template <class _Tp, class _Container>
inline _LIBCPP_HIDE_FROM_ABI bool operator<(const queue<_Tp, _Container>& __x, const queue<_Tp, _Container>& __y) {
  return __x.c < __y.c;
}

template <class _Tp, class _Container>
inline _LIBCPP_HIDE_FROM_ABI bool operator!=(const queue<_Tp, _Container>& __x, const queue<_Tp, _Container>& __y) {
  return !(__x == __y);
}

template <class _Tp, class _Container>
inline _LIBCPP_HIDE_FROM_ABI bool operator>(const queue<_Tp, _Container>& __x, const queue<_Tp, _Container>& __y) {
  return __y < __x;
}

template <class _Tp, class _Container>
inline _LIBCPP_HIDE_FROM_ABI bool operator>=(const queue<_Tp, _Container>& __x, const queue<_Tp, _Container>& __y) {
  return !(__x < __y);
}

template <class _Tp, class _Container>
inline _LIBCPP_HIDE_FROM_ABI bool operator<=(const queue<_Tp, _Container>& __x, const queue<_Tp, _Container>& __y) {
  return !(__y < __x);
}

#  if _LIBCPP_STD_VER >= 20

template <class _Tp, three_way_comparable _Container>
_LIBCPP_HIDE_FROM_ABI compare_three_way_result_t<_Container>
operator<=>(const queue<_Tp, _Container>& __x, const queue<_Tp, _Container>& __y) {
  // clang 16 bug: declaring `friend operator<=>` causes "use of overloaded operator '*' is ambiguous" errors
  return __x.__get_container() <=> __y.__get_container();
}

#  endif

template <class _Tp, class _Container, __enable_if_t<__is_swappable_v<_Container>, int> = 0>
inline _LIBCPP_HIDE_FROM_ABI void swap(queue<_Tp, _Container>& __x, queue<_Tp, _Container>& __y)
    _NOEXCEPT_(_NOEXCEPT_(__x.swap(__y))) {
  __x.swap(__y);
}

template <class _Tp, class _Container, class _Alloc>
struct _LIBCPP_TEMPLATE_VIS uses_allocator<queue<_Tp, _Container>, _Alloc> : public uses_allocator<_Container, _Alloc> {
};

template <class _Tp, class _Container, class _Compare>
class _LIBCPP_TEMPLATE_VIS priority_queue {
public:
  typedef _Container container_type;
  typedef _Compare value_compare;
  typedef typename container_type::value_type value_type;
  typedef typename container_type::reference reference;
  typedef typename container_type::const_reference const_reference;
  typedef typename container_type::size_type size_type;
  static_assert(is_same<_Tp, value_type>::value, "");

protected:
  container_type c;
  value_compare comp;

public:
  _LIBCPP_HIDE_FROM_ABI priority_queue() _NOEXCEPT_(
      is_nothrow_default_constructible<container_type>::value&& is_nothrow_default_constructible<value_compare>::value)
      : c(), comp() {}

  _LIBCPP_HIDE_FROM_ABI priority_queue(const priority_queue& __q) : c(__q.c), comp(__q.comp) {}

  _LIBCPP_HIDE_FROM_ABI priority_queue& operator=(const priority_queue& __q) {
    c    = __q.c;
    comp = __q.comp;
    return *this;
  }

#  ifndef _LIBCPP_CXX03_LANG
  _LIBCPP_HIDE_FROM_ABI priority_queue(priority_queue&& __q) noexcept(
      is_nothrow_move_constructible<container_type>::value && is_nothrow_move_constructible<value_compare>::value)
      : c(std::move(__q.c)), comp(std::move(__q.comp)) {}

  _LIBCPP_HIDE_FROM_ABI priority_queue& operator=(priority_queue&& __q) noexcept(
      is_nothrow_move_assignable<container_type>::value && is_nothrow_move_assignable<value_compare>::value) {
    c    = std::move(__q.c);
    comp = std::move(__q.comp);
    return *this;
  }
#  endif // _LIBCPP_CXX03_LANG

  _LIBCPP_HIDE_FROM_ABI explicit priority_queue(const value_compare& __comp) : c(), comp(__comp) {}
  _LIBCPP_HIDE_FROM_ABI priority_queue(const value_compare& __comp, const container_type& __c);
#  ifndef _LIBCPP_CXX03_LANG
  _LIBCPP_HIDE_FROM_ABI priority_queue(const value_compare& __comp, container_type&& __c);
#  endif
  template <class _InputIter, __enable_if_t<__has_input_iterator_category<_InputIter>::value, int> = 0>
  _LIBCPP_HIDE_FROM_ABI priority_queue(_InputIter __f, _InputIter __l, const value_compare& __comp = value_compare());

  template <class _InputIter, __enable_if_t<__has_input_iterator_category<_InputIter>::value, int> = 0>
  _LIBCPP_HIDE_FROM_ABI
  priority_queue(_InputIter __f, _InputIter __l, const value_compare& __comp, const container_type& __c);

#  ifndef _LIBCPP_CXX03_LANG
  template <class _InputIter, __enable_if_t<__has_input_iterator_category<_InputIter>::value, int> = 0>
  _LIBCPP_HIDE_FROM_ABI
  priority_queue(_InputIter __f, _InputIter __l, const value_compare& __comp, container_type&& __c);
#  endif // _LIBCPP_CXX03_LANG

#  if _LIBCPP_STD_VER >= 23
  template <_ContainerCompatibleRange<_Tp> _Range>
  _LIBCPP_HIDE_FROM_ABI priority_queue(from_range_t, _Range&& __range, const value_compare& __comp = value_compare())
      : c(from_range, std::forward<_Range>(__range)), comp(__comp) {
    std::make_heap(c.begin(), c.end(), comp);
  }
#  endif

  template <class _Alloc, __enable_if_t<uses_allocator<container_type, _Alloc>::value, int> = 0>
  _LIBCPP_HIDE_FROM_ABI explicit priority_queue(const _Alloc& __a);

  template <class _Alloc, __enable_if_t<uses_allocator<container_type, _Alloc>::value, int> = 0>
  _LIBCPP_HIDE_FROM_ABI priority_queue(const value_compare& __comp, const _Alloc& __a);

  template <class _Alloc, __enable_if_t<uses_allocator<container_type, _Alloc>::value, int> = 0>
  _LIBCPP_HIDE_FROM_ABI priority_queue(const value_compare& __comp, const container_type& __c, const _Alloc& __a);

  template <class _Alloc, __enable_if_t<uses_allocator<container_type, _Alloc>::value, int> = 0>
  _LIBCPP_HIDE_FROM_ABI priority_queue(const priority_queue& __q, const _Alloc& __a);

#  ifndef _LIBCPP_CXX03_LANG
  template <class _Alloc, __enable_if_t<uses_allocator<container_type, _Alloc>::value, int> = 0>
  _LIBCPP_HIDE_FROM_ABI priority_queue(const value_compare& __comp, container_type&& __c, const _Alloc& __a);

  template <class _Alloc, __enable_if_t<uses_allocator<container_type, _Alloc>::value, int> = 0>
  _LIBCPP_HIDE_FROM_ABI priority_queue(priority_queue&& __q, const _Alloc& __a);
#  endif // _LIBCPP_CXX03_LANG

  template <
      class _InputIter,
      class _Alloc,
      __enable_if_t<__has_input_iterator_category<_InputIter>::value && uses_allocator<container_type, _Alloc>::value,
                    int> = 0>
  _LIBCPP_HIDE_FROM_ABI priority_queue(_InputIter __f, _InputIter __l, const _Alloc& __a);

  template <
      class _InputIter,
      class _Alloc,
      __enable_if_t<__has_input_iterator_category<_InputIter>::value && uses_allocator<container_type, _Alloc>::value,
                    int> = 0>
  _LIBCPP_HIDE_FROM_ABI priority_queue(_InputIter __f, _InputIter __l, const value_compare& __comp, const _Alloc& __a);

  template <
      class _InputIter,
      class _Alloc,
      __enable_if_t<__has_input_iterator_category<_InputIter>::value && uses_allocator<container_type, _Alloc>::value,
                    int> = 0>
  _LIBCPP_HIDE_FROM_ABI priority_queue(
      _InputIter __f, _InputIter __l, const value_compare& __comp, const container_type& __c, const _Alloc& __a);

#  ifndef _LIBCPP_CXX03_LANG
  template <
      class _InputIter,
      class _Alloc,
      __enable_if_t<__has_input_iterator_category<_InputIter>::value && uses_allocator<container_type, _Alloc>::value,
                    int> = 0>
  _LIBCPP_HIDE_FROM_ABI
  priority_queue(_InputIter __f, _InputIter __l, const value_compare& __comp, container_type&& __c, const _Alloc& __a);
#  endif // _LIBCPP_CXX03_LANG

#  if _LIBCPP_STD_VER >= 23

  template <_ContainerCompatibleRange<_Tp> _Range,
            class _Alloc,
            class = enable_if_t<uses_allocator<_Container, _Alloc>::value>>
  _LIBCPP_HIDE_FROM_ABI priority_queue(from_range_t, _Range&& __range, const value_compare& __comp, const _Alloc& __a)
      : c(from_range, std::forward<_Range>(__range), __a), comp(__comp) {
    std::make_heap(c.begin(), c.end(), comp);
  }

  template <_ContainerCompatibleRange<_Tp> _Range,
            class _Alloc,
            class = enable_if_t<uses_allocator<_Container, _Alloc>::value>>
  _LIBCPP_HIDE_FROM_ABI priority_queue(from_range_t, _Range&& __range, const _Alloc& __a)
      : c(from_range, std::forward<_Range>(__range), __a), comp() {
    std::make_heap(c.begin(), c.end(), comp);
  }

#  endif

  [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI bool empty() const { return c.empty(); }
  _LIBCPP_HIDE_FROM_ABI size_type size() const { return c.size(); }
  _LIBCPP_HIDE_FROM_ABI const_reference top() const { return c.front(); }

  _LIBCPP_HIDE_FROM_ABI void push(const value_type& __v);
#  ifndef _LIBCPP_CXX03_LANG
  _LIBCPP_HIDE_FROM_ABI void push(value_type&& __v);

#    if _LIBCPP_STD_VER >= 23
  template <_ContainerCompatibleRange<_Tp> _Range>
  _LIBCPP_HIDE_FROM_ABI void push_range(_Range&& __range) {
    if constexpr (requires(container_type& __c) { __c.append_range(std::forward<_Range>(__range)); }) {
      c.append_range(std::forward<_Range>(__range));
    } else {
      ranges::copy(std::forward<_Range>(__range), std::back_inserter(c));
    }

    std::make_heap(c.begin(), c.end(), comp);
  }
#    endif

  template <class... _Args>
  _LIBCPP_HIDE_FROM_ABI void emplace(_Args&&... __args);
#  endif // _LIBCPP_CXX03_LANG
  _LIBCPP_HIDE_FROM_ABI void pop();

  _LIBCPP_HIDE_FROM_ABI void swap(priority_queue& __q)
      _NOEXCEPT_(__is_nothrow_swappable_v<container_type>&& __is_nothrow_swappable_v<value_compare>);

  [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI const _Container& __get_container() const { return c; }
};

#  if _LIBCPP_STD_VER >= 17
template <class _Compare,
          class _Container,
          class = enable_if_t<!__is_allocator<_Compare>::value>,
          class = enable_if_t<!__is_allocator<_Container>::value> >
priority_queue(_Compare, _Container) -> priority_queue<typename _Container::value_type, _Container, _Compare>;

template <class _InputIterator,
          class _Compare   = less<__iter_value_type<_InputIterator>>,
          class _Container = vector<__iter_value_type<_InputIterator>>,
          class            = enable_if_t<__has_input_iterator_category<_InputIterator>::value>,
          class            = enable_if_t<!__is_allocator<_Compare>::value>,
          class            = enable_if_t<!__is_allocator<_Container>::value> >
priority_queue(_InputIterator, _InputIterator, _Compare = _Compare(), _Container = _Container())
    -> priority_queue<__iter_value_type<_InputIterator>, _Container, _Compare>;

template <class _Compare,
          class _Container,
          class _Alloc,
          class = enable_if_t<!__is_allocator<_Compare>::value>,
          class = enable_if_t<!__is_allocator<_Container>::value>,
          class = enable_if_t<uses_allocator<_Container, _Alloc>::value> >
priority_queue(_Compare, _Container, _Alloc) -> priority_queue<typename _Container::value_type, _Container, _Compare>;

template <class _InputIterator,
          class _Allocator,
          class = enable_if_t<__has_input_iterator_category<_InputIterator>::value>,
          class = enable_if_t<__is_allocator<_Allocator>::value> >
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,
          class = enable_if_t<__has_input_iterator_category<_InputIterator>::value>,
          class = enable_if_t<!__is_allocator<_Compare>::value>,
          class = enable_if_t<__is_allocator<_Allocator>::value> >
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 _Alloc,
          class = enable_if_t<__has_input_iterator_category<_InputIterator>::value>,
          class = enable_if_t<!__is_allocator<_Compare>::value>,
          class = enable_if_t<!__is_allocator<_Container>::value>,
          class = enable_if_t<uses_allocator<_Container, _Alloc>::value> >
priority_queue(_InputIterator, _InputIterator, _Compare, _Container, _Alloc)
    -> priority_queue<typename _Container::value_type, _Container, _Compare>;
#  endif

#  if _LIBCPP_STD_VER >= 23

template <ranges::input_range _Range,
          class _Compare = less<ranges::range_value_t<_Range>>,
          class          = enable_if_t<!__is_allocator<_Compare>::value>>
priority_queue(from_range_t, _Range&&, _Compare = _Compare())
    -> priority_queue<ranges::range_value_t<_Range>, vector<ranges::range_value_t<_Range>>, _Compare>;

template <ranges::input_range _Range,
          class _Compare,
          class _Alloc,
          class = enable_if_t<!__is_allocator<_Compare>::value>,
          class = enable_if_t<__is_allocator<_Alloc>::value>>
priority_queue(from_range_t, _Range&&, _Compare, _Alloc)
    -> priority_queue<ranges::range_value_t<_Range>, vector<ranges::range_value_t<_Range>, _Alloc>, _Compare>;

template <ranges::input_range _Range, class _Alloc, class = enable_if_t<__is_allocator<_Alloc>::value>>
priority_queue(from_range_t, _Range&&, _Alloc)
    -> priority_queue<ranges::range_value_t<_Range>, vector<ranges::range_value_t<_Range>, _Alloc>>;

#  endif

template <class _Tp, class _Container, class _Compare>
inline priority_queue<_Tp, _Container, _Compare>::priority_queue(const _Compare& __comp, const container_type& __c)
    : c(__c), comp(__comp) {
  std::make_heap(c.begin(), c.end(), comp);
}

#  ifndef _LIBCPP_CXX03_LANG

template <class _Tp, class _Container, class _Compare>
inline priority_queue<_Tp, _Container, _Compare>::priority_queue(const value_compare& __comp, container_type&& __c)
    : c(std::move(__c)), comp(__comp) {
  std::make_heap(c.begin(), c.end(), comp);
}

#  endif // _LIBCPP_CXX03_LANG

template <class _Tp, class _Container, class _Compare>
template <class _InputIter, __enable_if_t<__has_input_iterator_category<_InputIter>::value, int> >
inline priority_queue<_Tp, _Container, _Compare>::priority_queue(
    _InputIter __f, _InputIter __l, const value_compare& __comp)
    : c(__f, __l), comp(__comp) {
  std::make_heap(c.begin(), c.end(), comp);
}

template <class _Tp, class _Container, class _Compare>
template <class _InputIter, __enable_if_t<__has_input_iterator_category<_InputIter>::value, int> >
inline priority_queue<_Tp, _Container, _Compare>::priority_queue(
    _InputIter __f, _InputIter __l, const value_compare& __comp, const container_type& __c)
    : c(__c), comp(__comp) {
  c.insert(c.end(), __f, __l);
  std::make_heap(c.begin(), c.end(), comp);
}

#  ifndef _LIBCPP_CXX03_LANG

template <class _Tp, class _Container, class _Compare>
template <class _InputIter, __enable_if_t<__has_input_iterator_category<_InputIter>::value, int> >
inline priority_queue<_Tp, _Container, _Compare>::priority_queue(
    _InputIter __f, _InputIter __l, const value_compare& __comp, container_type&& __c)
    : c(std::move(__c)), comp(__comp) {
  c.insert(c.end(), __f, __l);
  std::make_heap(c.begin(), c.end(), comp);
}

#  endif // _LIBCPP_CXX03_LANG

template <class _Tp, class _Container, class _Compare>
template <class _Alloc, __enable_if_t<uses_allocator<_Container, _Alloc>::value, int> >
inline priority_queue<_Tp, _Container, _Compare>::priority_queue(const _Alloc& __a) : c(__a) {}

template <class _Tp, class _Container, class _Compare>
template <class _Alloc, __enable_if_t<uses_allocator<_Container, _Alloc>::value, int> >
inline priority_queue<_Tp, _Container, _Compare>::priority_queue(const value_compare& __comp, const _Alloc& __a)
    : c(__a), comp(__comp) {}

template <class _Tp, class _Container, class _Compare>
template <class _Alloc, __enable_if_t<uses_allocator<_Container, _Alloc>::value, int> >
inline priority_queue<_Tp, _Container, _Compare>::priority_queue(
    const value_compare& __comp, const container_type& __c, const _Alloc& __a)
    : c(__c, __a), comp(__comp) {
  std::make_heap(c.begin(), c.end(), comp);
}

template <class _Tp, class _Container, class _Compare>
template <class _Alloc, __enable_if_t<uses_allocator<_Container, _Alloc>::value, int> >
inline priority_queue<_Tp, _Container, _Compare>::priority_queue(const priority_queue& __q, const _Alloc& __a)
    : c(__q.c, __a), comp(__q.comp) {}

#  ifndef _LIBCPP_CXX03_LANG

template <class _Tp, class _Container, class _Compare>
template <class _Alloc, __enable_if_t<uses_allocator<_Container, _Alloc>::value, int> >
inline priority_queue<_Tp, _Container, _Compare>::priority_queue(
    const value_compare& __comp, container_type&& __c, const _Alloc& __a)
    : c(std::move(__c), __a), comp(__comp) {
  std::make_heap(c.begin(), c.end(), comp);
}

template <class _Tp, class _Container, class _Compare>
template <class _Alloc, __enable_if_t<uses_allocator<_Container, _Alloc>::value, int> >
inline priority_queue<_Tp, _Container, _Compare>::priority_queue(priority_queue&& __q, const _Alloc& __a)
    : c(std::move(__q.c), __a), comp(std::move(__q.comp)) {}

#  endif // _LIBCPP_CXX03_LANG

template <class _Tp, class _Container, class _Compare>
template <
    class _InputIter,
    class _Alloc,
    __enable_if_t<__has_input_iterator_category<_InputIter>::value && uses_allocator<_Container, _Alloc>::value, int> >
inline priority_queue<_Tp, _Container, _Compare>::priority_queue(_InputIter __f, _InputIter __l, const _Alloc& __a)
    : c(__f, __l, __a), comp() {
  std::make_heap(c.begin(), c.end(), comp);
}

template <class _Tp, class _Container, class _Compare>
template <
    class _InputIter,
    class _Alloc,
    __enable_if_t<__has_input_iterator_category<_InputIter>::value && uses_allocator<_Container, _Alloc>::value, int> >
inline priority_queue<_Tp, _Container, _Compare>::priority_queue(
    _InputIter __f, _InputIter __l, const value_compare& __comp, const _Alloc& __a)
    : c(__f, __l, __a), comp(__comp) {
  std::make_heap(c.begin(), c.end(), comp);
}

template <class _Tp, class _Container, class _Compare>
template <
    class _InputIter,
    class _Alloc,
    __enable_if_t<__has_input_iterator_category<_InputIter>::value && uses_allocator<_Container, _Alloc>::value, int> >
inline priority_queue<_Tp, _Container, _Compare>::priority_queue(
    _InputIter __f, _InputIter __l, const value_compare& __comp, const container_type& __c, const _Alloc& __a)
    : c(__c, __a), comp(__comp) {
  c.insert(c.end(), __f, __l);
  std::make_heap(c.begin(), c.end(), comp);
}

#  ifndef _LIBCPP_CXX03_LANG
template <class _Tp, class _Container, class _Compare>
template <
    class _InputIter,
    class _Alloc,
    __enable_if_t<__has_input_iterator_category<_InputIter>::value && uses_allocator<_Container, _Alloc>::value, int> >
inline priority_queue<_Tp, _Container, _Compare>::priority_queue(
    _InputIter __f, _InputIter __l, const value_compare& __comp, container_type&& __c, const _Alloc& __a)
    : c(std::move(__c), __a), comp(__comp) {
  c.insert(c.end(), __f, __l);
  std::make_heap(c.begin(), c.end(), comp);
}
#  endif // _LIBCPP_CXX03_LANG

template <class _Tp, class _Container, class _Compare>
inline void priority_queue<_Tp, _Container, _Compare>::push(const value_type& __v) {
  c.push_back(__v);
  std::push_heap(c.begin(), c.end(), comp);
}

#  ifndef _LIBCPP_CXX03_LANG

template <class _Tp, class _Container, class _Compare>
inline void priority_queue<_Tp, _Container, _Compare>::push(value_type&& __v) {
  c.push_back(std::move(__v));
  std::push_heap(c.begin(), c.end(), comp);
}

template <class _Tp, class _Container, class _Compare>
template <class... _Args>
inline void priority_queue<_Tp, _Container, _Compare>::emplace(_Args&&... __args) {
  c.emplace_back(std::forward<_Args>(__args)...);
  std::push_heap(c.begin(), c.end(), comp);
}

#  endif // _LIBCPP_CXX03_LANG

template <class _Tp, class _Container, class _Compare>
inline void priority_queue<_Tp, _Container, _Compare>::pop() {
  std::pop_heap(c.begin(), c.end(), comp);
  c.pop_back();
}

template <class _Tp, class _Container, class _Compare>
inline void priority_queue<_Tp, _Container, _Compare>::swap(priority_queue& __q)
    _NOEXCEPT_(__is_nothrow_swappable_v<container_type>&& __is_nothrow_swappable_v<value_compare>) {
  using std::swap;
  swap(c, __q.c);
  swap(comp, __q.comp);
}

template <class _Tp,
          class _Container,
          class _Compare,
          __enable_if_t<__is_swappable_v<_Container> && __is_swappable_v<_Compare>, int> = 0>
inline _LIBCPP_HIDE_FROM_ABI void
swap(priority_queue<_Tp, _Container, _Compare>& __x, priority_queue<_Tp, _Container, _Compare>& __y)
    _NOEXCEPT_(_NOEXCEPT_(__x.swap(__y))) {
  __x.swap(__y);
}

template <class _Tp, class _Container, class _Compare, class _Alloc>
struct _LIBCPP_TEMPLATE_VIS uses_allocator<priority_queue<_Tp, _Container, _Compare>, _Alloc>
    : public uses_allocator<_Container, _Alloc> {};

_LIBCPP_END_NAMESPACE_STD

_LIBCPP_POP_MACROS

#  if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
#    include <concepts>
#    include <cstdlib>
#    include <functional>
#    include <type_traits>
#  endif
#endif // __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)

#endif // _LIBCPP_QUEUE