std::priority_queue(3)std::priority_queue(3)NAMEstd::priority_queue-
A standard container automatically sorting its contents.
SYNOPSIS
Public Types
typedef _Sequence::const_reference const_reference
typedef _Sequence container_type
typedef _Sequence::reference reference
typedef _Sequence::size_type size_type
typedef _Sequence::value_type value_type
Public Member Functions
template<typename... _Args> void emplace (_Args &&...__args)
bool empty () const
priority_queue & operator= (priority_queue &&__pq)
void pop ()
priority_queue (priority_queue &&__pq)
template<typename _InputIterator > priority_queue (_InputIterator
__first, _InputIterator __last, const _Compare &__x=_Compare(),
_Sequence &&__s=_Sequence())
template<typename _InputIterator > priority_queue (_InputIterator
__first, _InputIterator __last, const _Compare &__x, const
_Sequence &__s)
priority_queue (const _Compare &__x=_Compare(), _Sequence
&&__s=_Sequence())
priority_queue (const _Compare &__x, const _Sequence &__s)
void push (value_type &&__x)
void push (const value_type &__x)
size_type size () const
void swap (priority_queue &&__pq)
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.
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?)
Definition at line 369 of file stl_queue.h.
Constructor & Destructor Documentation
template<typename _Tp, typename _Sequence = vector<_Tp>, typename _Compare
= less<typename _Sequence::value_type>> std::priority_queue< _Tp,
_Sequence, _Compare >::priority_queue (const _Compare & __x, const
_Sequence & __s) [inline, explicit]
Default constructor creates no elements.
Definition at line 404 of file stl_queue.h.
References std::make_heap().
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:
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.
Definition at line 444 of file stl_queue.h.
References std::make_heap().
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] Returns true if the
queue is empty.
Definition at line 481 of file stl_queue.h.
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.
Definition at line 544 of file stl_queue.h.
References std::pop_heap().
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.
Definition at line 509 of file stl_queue.h.
References std::push_heap().
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] Returns the number
of elements in the queue.
Definition at line 486 of file stl_queue.h.
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.
Definition at line 494 of file stl_queue.h.
Referenced by __gnu_parallel::multiseq_partition(), and
__gnu_parallel::multiseq_selection().
Author
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libstdc++ 22 Nov 2013 std::priority_queue(3)