std::queue< _Tp, _Sequence > Class Template Reference

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 _Seq = _Sequence, typename _Requires = typename enable_if<is_default_constructible<_Seq>::value>::type>
	queue ()
	queue (const _Sequence &__c)
	queue (_Sequence &&__c)
template<typename _Alloc , typename _Requires = _Uses<_Alloc>>
	queue (const _Alloc &__a)
template<typename _Alloc , typename _Requires = _Uses<_Alloc>>
	queue (const _Sequence &__c, const _Alloc &__a)
template<typename _Alloc , typename _Requires = _Uses<_Alloc>>
	queue (_Sequence &&__c, const _Alloc &__a)
template<typename _Alloc , typename _Requires = _Uses<_Alloc>>
	queue (const queue &__q, const _Alloc &__a)
template<typename _Alloc , typename _Requires = _Uses<_Alloc>>
	queue (queue &&__q, const _Alloc &__a)
reference	back ()
const_reference	back () const
template<typename... _Args>
void	emplace (_Args &&... __args)
_GLIBCXX_NODISCARD bool	empty () const
reference	front ()
const_reference	front () const
void	pop ()
void	push (const value_type &__x)
void	push (value_type &&__x)
size_type	size () const
void	swap (queue &__q) noexcept(__is_nothrow_swappable< _Sequence >::value)

Protected Attributes
_Sequence	c

Friends
template<typename _Tp1 , typename _Seq1 >
bool	operator< (const queue< _Tp1, _Seq1 > &, const queue< _Tp1, _Seq1 > &)
template<typename _Tp1 , typename _Seq1 >
bool	operator== (const queue< _Tp1, _Seq1 > &, const queue< _Tp1, _Seq1 > &)

Detailed Description

template<typename _Tp, typename _Sequence = deque<_Tp>>
class std::queue< _Tp, _Sequence >

A standard container giving FIFO behavior.

Template Parameters

_Tp	Type of element.
_Sequence	Type of underlying sequence, defaults to deque<_Tp>.

Meets many of the requirements of a container, but does not define anything to do with iterators. Very few of the other standard container interfaces are defined.

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 strict first-in-first-out queue behavior.

The second template parameter defines the type of the underlying sequence/container. It defaults to std::deque, but it can be any type that supports front, back, push_back, and pop_front, such as std::list or an appropriate user-defined type.

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

Definition at line 96 of file stl_queue.h.

Constructor & Destructor Documentation

queue()

template<typename _Tp, typename _Sequence = deque<_Tp>>

template<typename _Seq = _Sequence, typename _Requires = typename enable_if<is_default_constructible<_Seq>::value>::type>

std::queue< _Tp, _Sequence >::queue ( )

inline

Default constructor creates no elements.

Definition at line 160 of file stl_queue.h.

Member Function Documentation

back() [1/2]

template<typename _Tp, typename _Sequence = deque<_Tp>>

reference std::queue< _Tp, _Sequence >::back ( )

inline

Returns a read/write reference to the data at the last element of the queue.

Definition at line 232 of file stl_queue.h.

back() [2/2]

template<typename _Tp, typename _Sequence = deque<_Tp>>

const_reference std::queue< _Tp, _Sequence >::back ( ) const

inline

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

Definition at line 243 of file stl_queue.h.

empty()

template<typename _Tp, typename _Sequence = deque<_Tp>>

_GLIBCXX_NODISCARD bool std::queue< _Tp, _Sequence >::empty ( ) const

inline

Returns true if the queue is empty.

Definition at line 197 of file stl_queue.h.

References std::queue< _Tp, _Sequence >::c.

front() [1/2]

template<typename _Tp, typename _Sequence = deque<_Tp>>

reference std::queue< _Tp, _Sequence >::front ( )

inline

Returns a read/write reference to the data at the first element of the queue.

Definition at line 210 of file stl_queue.h.

front() [2/2]

template<typename _Tp, typename _Sequence = deque<_Tp>>

const_reference std::queue< _Tp, _Sequence >::front ( ) const

inline

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

Definition at line 221 of file stl_queue.h.

pop()

template<typename _Tp, typename _Sequence = deque<_Tp>>

void std::queue< _Tp, _Sequence >::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 292 of file stl_queue.h.

push()

template<typename _Tp, typename _Sequence = deque<_Tp>>

void std::queue< _Tp, _Sequence >::push ( const value_type &  __x )

inline

Add data to the end of the queue.

Parameters

__x	Data to be added.

This is a typical queue operation. The function creates an element at the end of the queue and assigns the given data to it. The time complexity of the operation depends on the underlying sequence.

Definition at line 259 of file stl_queue.h.

References std::queue< _Tp, _Sequence >::c.

size()

template<typename _Tp, typename _Sequence = deque<_Tp>>

size_type std::queue< _Tp, _Sequence >::size ( ) const

inline

Returns the number of elements in the queue.

Definition at line 202 of file stl_queue.h.

References std::queue< _Tp, _Sequence >::c.

Member Data Documentation

c

template<typename _Tp, typename _Sequence = deque<_Tp>>

_Sequence std::queue< _Tp, _Sequence >::c

protected

c is the underlying container.

Definition at line 147 of file stl_queue.h.

Referenced by std::queue< _Tp, _Sequence >::empty(), std::operator<(), std::operator==(), std::queue< _Tp, _Sequence >::push(), and std::queue< _Tp, _Sequence >::size().

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The documentation for this class was generated from the following file:

• stl_queue.h