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 > priority_queue (_InputIterator __first, _InputIterator __last, const _Compare &__x, const _Sequence &__s)
Builds a queue from a range. template<typename _InputIterator > priority_queue (_InputIterator __first, _InputIterator __last, const _Compare &__x=_Compare(), _Sequence &&__s=_Sequence())
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

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

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

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 > std::priority_queue< _Tp, _Sequence, _Compare >::priority_queue (_InputIterator __first, _InputIterator __last, const _Compare & __x, const _Sequence & __s) [inline]¶

Builds a queue from a range.

Parameters

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.

template<typename _Tp , typename _Sequence = vector<_Tp>, typename _Compare = less<typename _Sequence::value_type>> bool std::priority_queue< _Tp, _Sequence, _Compare >::empty () const [inline]¶

Returns true if the queue is empty.

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.

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

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

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]¶

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]¶

Returns a read-only (constant) reference to the data at the first element of the queue.