< cpp‎ | container
Defined in header <queue>

    class T,
    class Container = std::vector<T>,
    class Compare = std::less<typename Container::value_type>

> class priority_queue;

A priority queue is a container adaptor that provides constant time maximum (or minimum, depending on Compare) extraction at the expense of logarithmic insertion.

Working with a priority_queue is similar to managing a heap in some random access container, with the benefit of not being able to accidentally invalidate the heap.


[edit] Template parameters

T - The type of the stored elements.
Container - The type of the underlying container to use to store the elements. The container must satisfy the requirements of SequenceContainer. Additionally, it must provide the following functions with the usual semantics:
  • front()
  • push_back()
  • pop_back()

The standard containers std::vector and std::deque satisfy these requirements.

Compare - A Compare type providing a strict weak ordering.

[edit] Member types

Member type Definition
container_type Container
value_type Container::value_type
size_type Container::size_type
reference Container::reference
const_reference Container::const_reference

[edit] Member functions

constructs the priority_queue
(public member function)
destructs the priority_queue
(public member function)
assigns values to the container adaptor
(public member function)
Element access
accesses the top element
(public member function)
checks whether the underlying container is empty
(public member function)
returns the number of elements
(public member function)
inserts element and sorts the underlying container
(public member function)
constructs element in-place and sorts the underlying container
(public member function)
removes the top element
(public member function)
swaps the contents
(public member function)

Member objects

Container c
the underlying container
(protected member object)
Compare comp
the comparison function object
(protected member object)

[edit] Non-member functions

specializes the std::swap algorithm
(function template)

[edit] Helper classes

specializes the std::uses_allocator type trait
(function template)