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Standard library header <queue>

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C++
Standard library headers

Este encabezado es parte de la biblioteca de contenedores .

Contenidos

Incluye

(C++20)
Soporte para operador de comparación de tres vías
(C++11)
std::initializer_list plantilla de clase

Clases

adapta un contenedor para proporcionar cola (estructura de datos FIFO)
(plantilla de clase)
adapta un contenedor para proporcionar cola de prioridad
(plantilla de clase)
(C++11)
especializa el rasgo de tipo std::uses_allocator
(especialización de plantilla de clase)
(C++11)
especializa el rasgo de tipo std::uses_allocator
(especialización de plantilla de clase)

Funciones

(C++20)
compara lexicográficamente los valores de dos queue s
(plantilla de función)
(C++11)
especializa el algoritmo std::swap
(plantilla de función)
(C++11)
especializa el algoritmo std::swap
(plantilla de función)

Sinopsis 

#include <compare>
#include <initializer_list>
namespace std {
  // plantilla de clase queue
  template<class T, class Container = deque<T>>
  class queue;
  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);
  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, class Alloc>
  struct uses_allocator<queue<T, Container>, Alloc>;
  // especialización formatter para queue
  template<class CharT, class T, formattable<CharT> Container>
  struct formatter<queue<T, Container>, CharT>;
  // plantilla de clase priority_queue
  template<class T,
           class Container = vector<T>,
           class Compare   = less<typename Container::value_type>>
  class priority_queue;
  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)));
  template<class T, class Container, class Compare, class Alloc>
  struct uses_allocator<priority_queue<T, Container, Compare>, Alloc>;
  // especialización formatter para priority_queue
  template<class CharT, class T, formattable<CharT> Container, class Compare>
  struct formatter<priority_queue<T, Container, Compare>, CharT>;
}

Plantilla de clase std::queue 

namespace std {
  template<class T, class Container = deque<T>>
  class queue
  {
  public:
    using value_type      = typename Container::value_type;
    using reference       = typename Container::referencia;
    using const_reference = typename Container::const_reference;
    using size_type       = typename Container::size_type;
    using container_type  = Container;
  protected:
    Container c;
  public:
    queue()
      : queue(Container())
    {
    }
    explicit queue(const Container&);
    explicit queue(Container&&);
    template<class InputIter>
    queue(InputIter first, InputIter last);
    template<container-compatible-range<T> R>
    queue(from_range_t, R&& rg);
    template<class Alloc>
    explicit queue(const Alloc&);
    template<class Alloc>
    queue(const Container&, const Alloc&);
    template<class Alloc>
    queue(Container&&, const Alloc&);
    template<class Alloc>
    queue(const queue&, const Alloc&);
    template<class Alloc>
    queue(queue&&, const Alloc&);
    template<class InputIter, class Alloc>
    queue(InputIter first, InputIter last, const Alloc&);
    template<container-compatible-range<T> R, class Alloc>
    queue(from_range_t, R&& rg, const Alloc&);
    bool empty() const { return c.empty(); }
    size_type size() const { return c.size(); }
    reference front() { return c.front(); }
    const_reference front() const { return c.front(); }
    reference back() { return c.back(); }
    const_reference back() const { return c.back(); }
    void push(const value_type& x) { c.push_back(x); }
    void push(value_type&& x) { c.push_back(std::move(x)); }
    template<container-compatible-range<T> R>
    void push_range(R&& rg);
    template<class... Args>
    decltype(auto) emplace(Args&&... args)
    {
      return c.emplace_back(std::forward<Args>(args)...);
    }
    void pop() { c.pop_front(); }
    void swap(queue& q) noexcept(is_nothrow_swappable_v<Container>)
    {
      using std::swap;
      swap(c, q.c);
    }
  };
  template<class Container>
  queue(Container) -> queue<typename Container::value_type, Container>;
  template<class InputIter>
  queue(InputIter, InputIter) -> queue</*tipo-de-valor-iter*/<InputIter>>;
  template<ranges::input_range R>
  queue(from_range_t, R&&) -> queue<ranges::range_value_t<R>>;
  template<class Container, class Allocator>
  queue(Container, Allocator) -> queue<typename Container::value_type, Container>;
  template<class InputIter, class Allocator>
  queue(InputIter, InputIter, Allocator)
    -> queue</*iter-value-type*/<InputIter>,
             deque</*iter-value-type*/<InputIter>, Allocator>>;
  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>>;
  template<class T, class Container, class Alloc>
  struct uses_allocator<queue<T, Container>, Alloc>
    : uses_allocator<Container, Alloc>::type
  {};
}

Plantilla de clase std::priority_queue 

namespace std {
  template<class T,
           class Container = vector<T>,
           class Compare   = less<typename Container::value_type>>
  class priority_queue
  {
  public:
    using value_type      = typename Container::value_type;
    using reference       = typename Container::referencia;
    using const_reference = typename Container::const_reference;
    using size_type       = typename Container::size_type;
    using container_type  = Container;
    using value_compare   = Compare;
  protected:
    Container c;
    Compare comp;
  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 InputIter>
    priority_queue(InputIter first, InputIter last, const Compare& x = Compare());
    template<class InputIter>
    priority_queue(InputIter first, InputIter last, const Compare& x, const Container&);
    template<class InputIter>
    priority_queue(InputIter first, InputIter last, const Compare& x, Container&&);
    template<container-compatible-range<T> R>
    priority_queue(from_range_t, R&& rg, const Compare& x = Compare());
    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 InputIter, class Alloc>
    priority_queue(InputIter, InputIter, const Alloc&);
    template<class InputIter, class Alloc>
    priority_queue(InputIter, InputIter, const Compare&, const Alloc&);
    template<class InputIter, class Alloc>
    priority_queue(InputIter, InputIter, const Compare&, const Container&, const Alloc&);
    template<class InputIter, class Alloc>
    priority_queue(InputIter, InputIter, const Compare&, Container&&, const Alloc&);
    template<container-compatible-range<T> R, class Alloc>
    priority_queue(from_range_t, R&& rg, const Compare&, const Alloc&);
    template<container-compatible-range<T> R, class Alloc>
    priority_queue(from_range_t, R&& rg, const Alloc&);
    bool empty() const { return c.empty(); }
    size_type size() const { return c.size(); }
    const_reference top() const { return c.front(); }
    void push(const value_type& x);
    void push(value_type&& x);
    template<container-compatible-range<T> R>
    void push_range(R&& rg);
    template<class... Args>
    void emplace(Args&&... args);
    void pop();
    void swap(priority_queue& q) noexcept(
      is_nothrow_swappable_v<Container>&& is_nothrow_swappable_v<Compare>)
    {
      using std::swap;
      swap(c, q.c);
      swap(comp, q.comp);
    }
  };
  template<class Compare, class Container>
  priority_queue(Compare, Container)
    -> priority_queue<typename Container::value_type, Container, Compare>;
  template<class InputIter,
           class Compare   = less</*iter-value-type*/<InputIter>>,
           class Container = vector</*iter-value-type*/<InputIter>>>
  priority_queue(InputIter, InputIter, Compare = Compare(), Container = Container())
    -> priority_queue</*iter-value-type*/<InputIter>, Container, Compare>;
  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>;
  template<class Compare, class Container, class Allocator>
  priority_queue(Compare, Container, Allocator)
    -> priority_queue<typename Container::value_type, Container, Compare>;
  template<class InputIter, class Allocator>
  priority_queue(InputIter, InputIter, Allocator)
    -> priority_queue</*iter-value-type*/<InputIter>,
                      vector</*iter-value-type*/<InputIter>, Allocator>,
                      less</*iter-value-type*/<InputIter>>>;
  template<class InputIter, class Compare, class Allocator>
  priority_queue(InputIter, InputIter, Compare, Allocator)
    -> priority_queue</*iter-value-type*/<InputIter>,
                      vector</*iter-value-type*/<InputIter>, Allocator>,
                      Compare>;
  template<class InputIter, class Compare, class Container, class Allocator>
  priority_queue(InputIter, InputIter, Compare, Container, Allocator)
    -> priority_queue<typename Container::value_type, Container, Compare>;
  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>;
  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>>;
  // no equality is provided
  template<class T, class Container, class Compare, class Alloc>
  struct uses_allocator<priority_queue<T, Container, Compare>, Alloc>
    : uses_allocator<Container, Alloc>::type
  {};
}