std::queue< _Tp, _Sequence >(3)

NAME
std::queue< _Tp, _Sequence > -

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
queue (const _Sequence &__c)
queue (_Sequence &&__c=_Sequence())
reference back ()
const_reference back () const
template<typename... _Args> void emplace (_Args &&...__args)
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(noexcept(swap(c, __q.c)))

  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

  template<typename _Tp, typename _Sequence = deque<_Tp>> std::queue< _Tp, _Sequence >::queue (const _Sequence & __c) [inline], [explicit]

Default constructor creates no elements.

Definition at line 141 of file stl_queue.h.

Member Function Documentation

  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 188 of file stl_queue.h.

  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 199 of file stl_queue.h.

  template<typename _Tp, typename _Sequence = deque<_Tp>> bool std::queue< _Tp, _Sequence >::empty () const [inline]
Returns true if the queue is empty.

Definition at line 153 of file stl_queue.h.

  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 166 of file stl_queue.h.

  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 177 of file stl_queue.h.

  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 241 of file stl_queue.h.

  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 215 of file stl_queue.h.

  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 158 of file stl_queue.h.

Member Data Documentation

  template<typename _Tp, typename _Sequence = deque<_Tp>> _Sequence std::queue< _Tp, _Sequence >::c [protected]

Definition at line 129 of file stl_queue.h.

Referenced by std::operator<(), and std::operator==().

Author

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