QPtrQueue(3qt)QPtrQueue(3qt)NAMEQPtrQueue - Template class that provides a queue
SYNOPSIS
#include <qptrqueue.h>
Public Members
QPtrQueue ()
QPtrQueue ( const QPtrQueue<type> & queue )
~QPtrQueue ()
QPtrQueue<type> & operator= ( const QPtrQueue<type> & queue )
bool autoDelete () const
void setAutoDelete ( bool enable )
uint count () const
bool isEmpty () const
void enqueue ( const type * d )
type * dequeue ()
bool remove ()
void clear ()
type * head () const
operator type * () const
type * current () const
Protected Members
virtual QDataStream & read ( QDataStream & s, QPtrCollection::Item &
item )
virtual QDataStream & write ( QDataStream & s, QPtrCollection::Item
item ) const
DESCRIPTION
The QPtrQueue class is a template class that provides a queue.
QValueVector can be used as an STL-compatible alternative to this
class.
A template instance QPtrQueue<X> is a queue that operates on pointers
to X (X*).
A queue is a first in, first out structure. Items are added to the tail
of the queue with enqueue() and retrieved from the head with dequeue().
You can peek at the head item without dequeing it using head().
You can control the queue's deletion policy with setAutoDelete().
For compatibility with the QPtrCollection classes, current() and
remove() are provided; both operate on the head().
See also QPtrList, QPtrStack, Collection Classes, and Non-GUI Classes.
MEMBER FUNCTION DOCUMENTATIONQPtrQueue::QPtrQueue ()
Creates an empty queue with autoDelete() set to FALSE.
QPtrQueue::QPtrQueue ( const QPtrQueue<type> & queue )
Creates a queue from queue.
Only the pointers are copied; the items are not. The autoDelete() flag
is set to FALSE.
QPtrQueue::~QPtrQueue ()
Destroys the queue. Items in the queue are deleted if autoDelete() is
TRUE.
bool QPtrQueue::autoDelete () const
Returns the setting of the auto-delete option. The default is FALSE.
See also setAutoDelete().
void QPtrQueue::clear ()
Removes all items from the queue, and deletes them if autoDelete() is
TRUE.
See also remove().
uint QPtrQueue::count () const
Returns the number of items in the queue.
See also isEmpty().
type * QPtrQueue::current () const
Returns a pointer to the head item in the queue. The queue is not
changed. Returns 0 if the queue is empty.
See also dequeue() and isEmpty().
type * QPtrQueue::dequeue ()
Takes the head item from the queue and returns a pointer to it. Returns
0 if the queue is empty.
See also enqueue() and count().
void QPtrQueue::enqueue ( const type * d )
Adds item d to the tail of the queue.
See also count() and dequeue().
type * QPtrQueue::head () const
Returns a pointer to the head item in the queue. The queue is not
changed. Returns 0 if the queue is empty.
See also dequeue() and isEmpty().
bool QPtrQueue::isEmpty () const
Returns TRUE if the queue is empty; otherwise returns FALSE.
See also count(), dequeue(), and head().
QPtrQueue::operator type * () const
Returns a pointer to the head item in the queue. The queue is not
changed. Returns 0 if the queue is empty.
See also dequeue() and isEmpty().
QPtrQueue<type> & QPtrQueue::operator= ( const QPtrQueue<type> & queue )
Assigns queue to this queue and returns a reference to this queue.
This queue is first cleared and then each item in queue is enqueued to
this queue. Only the pointers are copied.
Warning: The autoDelete() flag is not modified. If it it TRUE for both
queue and this queue, deleting the two lists will cause double-deletion
of the items.
QDataStream & QPtrQueue::read ( QDataStream & s, QPtrCollection::Item & item )
[virtual protected]
Reads a queue item, item, from the stream s and returns a reference to
the stream.
The default implementation sets item to 0.
See also write().
bool QPtrQueue::remove ()
Removes the head item from the queue, and returns TRUE if there was an
item, i.e. the queue wasn't empty; otherwise returns FALSE.
The item is deleted if autoDelete() is TRUE.
See also head(), isEmpty(), and dequeue().
void QPtrQueue::setAutoDelete ( bool enable )
Sets the queue to auto-delete its contents if enable is TRUE and not to
delete them if enable is FALSE.
If auto-deleting is turned on, all the items in a queue are deleted
when the queue itself is deleted. This can be quite convenient if the
queue has the only pointer to the items.
The default setting is FALSE, for safety. If you turn it on, be careful
about copying the queue: you might find yourself with two queues
deleting the same items.
See also autoDelete().
QDataStream & QPtrQueue::write ( QDataStream & s, QPtrCollection::Item item )
const [virtual protected]
Writes a queue item, item, to the stream s and returns a reference to
the stream.
The default implementation does nothing.
See also read().
SEE ALSO
http://doc.trolltech.com/qptrqueue.html
http://www.trolltech.com/faq/tech.html
COPYRIGHT
Copyright 1992-2007 Trolltech ASA, http://www.trolltech.com. See the
license file included in the distribution for a complete license
statement.
AUTHOR
Generated automatically from the source code.
BUGS
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help you. Thank you.
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If you find errors in this manual page, please report them to qt-
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(qptrqueue.3qt) and the Qt version (3.3.8).
Trolltech AS 2 February 2007 QPtrQueue(3qt)