std::priority_queue< _Tp, _Sequence, _Compare >(3)

NAME
std::priority_queue< _Tp, _Sequence, _Compare > - A standard container automatically sorting its contents.

SYNOPSIS

#include <queue>

  Public Types
typedef _Sequence::const_reference const_reference
typedef _Sequence container_type
typedef _Sequence::reference reference
typedef _Sequence::size_type size_type
typedef _Compare value_compare
typedef _Sequence::value_type value_type

  Public Member Functions
template<typename _Seq = _Sequence, typename _Requires = typename enable_if<__and_<is_default_constructible<_Compare>, is_default_constructible<_Seq>>::value>::type> priority_queue ()
Default constructor creates no elements.
template<typename _InputIterator, typename _Alloc, typename = std::_RequireInputIter<_InputIterator>, typename _Requires = _Uses<_Alloc>> priority_queue (_InputIterator __first, _InputIterator __last, const _Alloc &__alloc)
template<typename _InputIterator, typename = std::_RequireInputIter<_InputIterator>> priority_queue (_InputIterator __first, _InputIterator __last, const _Compare &__x, _Sequence &&__s)
template<typename _InputIterator, typename _Alloc, typename _Requires = _Uses<_Alloc>> priority_queue (_InputIterator __first, _InputIterator __last, const _Compare &__x, _Sequence &&__s, const _Alloc &__alloc)
template<typename _InputIterator, typename _Alloc, typename = std::_RequireInputIter<_InputIterator>, typename _Requires = _Uses<_Alloc>> priority_queue (_InputIterator __first, _InputIterator __last, const _Compare &__x, const _Alloc &__alloc)
template<typename _InputIterator, typename = std::_RequireInputIter<_InputIterator>> priority_queue (_InputIterator __first, _InputIterator __last, const _Compare &__x, const _Sequence &__s)
template<typename _InputIterator, typename _Alloc, typename = std::_RequireInputIter<_InputIterator>, typename _Requires = _Uses<_Alloc>> priority_queue (_InputIterator __first, _InputIterator __last, const _Compare &__x, const _Sequence &__s, const _Alloc &__alloc)
template<typename _InputIterator, typename = std::_RequireInputIter<_InputIterator>> priority_queue (_InputIterator __first, _InputIterator __last, const _Compare &__x=_Compare())
Builds a queue from a range.
template<typename _Alloc, typename _Requires = _Uses<_Alloc>> priority_queue (const _Alloc &__a)
template<typename _Alloc, typename _Requires = _Uses<_Alloc>> priority_queue (const _Compare &__x, _Sequence &&__c, const _Alloc &__a)
priority_queue (const _Compare &__x, _Sequence &&__s=_Sequence())
template<typename _Alloc, typename _Requires = _Uses<_Alloc>> priority_queue (const _Compare &__x, const _Alloc &__a)
template<typename _Alloc, typename _Requires = _Uses<_Alloc>> priority_queue (const _Compare &__x, const _Sequence &__c, const _Alloc &__a)
priority_queue (const _Compare &__x, const _Sequence &__s)
template<typename _Alloc, typename _Requires = _Uses<_Alloc>> priority_queue (const priority_queue &__q, const _Alloc &__a)
template<typename _Alloc, typename _Requires = _Uses<_Alloc>> priority_queue (priority_queue &&__q, const _Alloc &__a)
template<typename... _Args> void emplace (_Args &&... __args)
bool empty () const
void pop ()
Removes first element.
void push (const value_type &__x)
Add data to the queue.
void push (value_type &&__x)
size_type size () const
void swap (priority_queue &__pq) noexcept(__and_<//c++1z or gnu++11 __is_nothrow_swappable< _Sequence >, __is_nothrow_swappable< _Compare > >::value)
const_reference top () const

  Protected Attributes
_Sequence c
_Compare comp

Detailed Description

  template<typename _Tp, typename _Sequence = vector<_Tp>, typename _Compare = less<typename _Sequence::value_type>>
class std::priority_queue< _Tp, _Sequence, _Compare >"A standard container automatically sorting its contents.

Template Parameters
    _Tp Type of element.
    _Sequence Type of underlying sequence, defaults to vector<_Tp>.
    _Compare Comparison function object type, defaults to less<_Sequence::value_type>.

This is not a true container, but an adaptor. It holds another container, and provides a wrapper interface to that container. The wrapper is what enforces priority-based sorting and queue behavior. Very few of the standard container/sequence interface requirements are met (e.g., iterators).

The second template parameter defines the type of the underlying sequence/container. It defaults to std::vector, but it can be any type that supports front(), push_back, pop_back, and random-access iterators, such as std::deque or an appropriate user-defined type.

The third template parameter supplies the means of making priority comparisons. It defaults to less<value_type> but can be anything defining a strict weak ordering.

Members not found in normal containers are container_type, which is a typedef for the second Sequence parameter, and push, pop, and top, which are standard queue operations.

Note
    No equality/comparison operators are provided for priority_queue.

    Sorting of the elements takes place as they are added to, and removed from, the priority_queue using the priority_queue's member functions. If you access the elements by other means, and change their data such that the sorting order would be different, the priority_queue will not re-sort the elements for you. (How could it know to do so?)

Constructor & Destructor Documentation

  template<typename _Tp, typename _Sequence = vector<_Tp>, typename _Compare = less<typename _Sequence::value_type>> template<typename _Seq = _Sequence, typename _Requires = typename enable_if<__and_<is_default_constructible<_Compare>, is_default_constructible<_Seq>>::value>::type> std::priority_queue< _Tp, _Sequence, _Compare >::priority_queue () [inline]

Default constructor creates no elements.

  template<typename _Tp, typename _Sequence = vector<_Tp>, typename _Compare = less<typename _Sequence::value_type>> template<typename _InputIterator, typename = std::_RequireInputIter<_InputIterator>> std::priority_queue< _Tp, _Sequence, _Compare >::priority_queue (_InputIterator __first, _InputIterator __last, const _Compare & __x = _Compare()) [inline]

Builds a queue from a range.

Parameters
    __first An input iterator.
    __last An input iterator.
    __x A comparison functor describing a strict weak ordering.
    __s An initial sequence with which to start.

Begins by copying __s, inserting a copy of the elements from [first,last) into the copy of __s, then ordering the copy according to __x.

For more information on function objects, see the documentation on functor base classes.

Member Function Documentation

  template<typename _Tp, typename _Sequence = vector<_Tp>, typename _Compare = less<typename _Sequence::value_type>> bool std::priority_queue< _Tp, _Sequence, _Compare >::empty () const [inline], [nodiscard]
Returns true if the queue is empty.

Referenced by __gnu_parallel::multiseq_partition(), and __gnu_parallel::multiseq_selection().

  template<typename _Tp, typename _Sequence = vector<_Tp>, typename _Compare = less<typename _Sequence::value_type>> void std::priority_queue< _Tp, _Sequence, _Compare >::pop () [inline]

Removes first element. This is a typical queue operation. It shrinks the queue by one. The time complexity of the operation depends on the underlying sequence.

Note that no data is returned, and if the first element's data is needed, it should be retrieved before pop() is called.

Referenced by __gnu_parallel::multiseq_partition(), and __gnu_parallel::multiseq_selection().

  template<typename _Tp, typename _Sequence = vector<_Tp>, typename _Compare = less<typename _Sequence::value_type>> void std::priority_queue< _Tp, _Sequence, _Compare >::push (const value_type & __x) [inline]

Add data to the queue.

Parameters
    __x Data to be added.

This is a typical queue operation. The time complexity of the operation depends on the underlying sequence.

Referenced by __gnu_parallel::multiseq_partition(), and __gnu_parallel::multiseq_selection().

  template<typename _Tp, typename _Sequence = vector<_Tp>, typename _Compare = less<typename _Sequence::value_type>> size_type std::priority_queue< _Tp, _Sequence, _Compare >::size () const [inline], [nodiscard]
Returns the number of elements in the queue.

  template<typename _Tp, typename _Sequence = vector<_Tp>, typename _Compare = less<typename _Sequence::value_type>> const_reference std::priority_queue< _Tp, _Sequence, _Compare >::top () const [inline], [nodiscard]
Returns a read-only (constant) reference to the data at the first element of the queue.

Referenced by __gnu_parallel::multiseq_partition(), and __gnu_parallel::multiseq_selection().

Author

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