std::priority_queue< _Tp, _Sequence, _Compare >(3) Library Functions Manual std::priority_queue< _Tp, _Sequence, _Compare >(3)
NAME
std::priority_queue< _Tp, _Sequence, _Compare > -
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
priority_queue (const _Compare &__x, const _Sequence &__s)
priority_queue (const _Compare &__x=_Compare(), _Sequence &&__s=_Sequence())
template<typename _InputIterator > priority_queue (_InputIterator __first, _InputIterator __last, const _Compare &__x, const _Sequence
&__s)
template<typename _InputIterator > priority_queue (_InputIterator __first, _InputIterator __last, const _Compare &__x=_Compare(), _Sequence
&&__s=_Sequence())
template<typename... _Args> void emplace (_Args &&...__args)
bool empty () const
void noexcept (noexcept(swap(c, __pq.c))&&noexcept(swap(comp, __pq.comp)))
void pop ()
void push (const value_type &__x)
void push (value_type &&__x)
size_type size () const
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?)
Definition at line 367 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 402 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 442 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 468 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 531 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 496 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 473 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 481 of file stl_queue.h.
Referenced by __gnu_parallel::multiseq_partition(), and __gnu_parallel::multiseq_selection().
Author
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libstdc++ Tue Jun 10 2014 std::priority_queue< _Tp, _Sequence, _Compare >(3)