QCacheIterator(3qt)QCacheIterator(3qt)NAMEQCacheIterator - Iterator for QCache collections
SYNOPSIS
#include <qcache.h>
Public Members
QCacheIterator ( const QCache<type> & cache )
QCacheIterator ( const QCacheIterator<type> & ci )
QCacheIterator<type> & operator= ( const QCacheIterator<type> & ci )
uint count () const
bool isEmpty () const
bool atFirst () const
bool atLast () const
type * toFirst ()
type * toLast ()
operator type * () const
type * current () const
QString currentKey () const
type * operator() ()
type * operator++ ()
type * operator+= ( uint jump )
type * operator-- ()
type * operator-= ( uint jump )
DESCRIPTION
The QCacheIterator class provides an iterator for QCache collections.
Note that the traversal order is arbitrary; you are not guaranteed any
particular order. If new objects are inserted into the cache while the
iterator is active, the iterator may or may not see them.
Multiple iterators are completely independent, even when they operate
on the same QCache. QCache updates all iterators that refer an item
when that item is removed.
QCacheIterator provides an operator++(), and an operator+=() to
traverse the cache. The current() and currentKey() functions are used
to access the current cache item and its key. The atFirst() and
atLast() return TRUE if the iterator points to the first or last item
in the cache respectively. The isEmpty() function returns TRUE if the
cache is empty, and count() returns the number of items in the cache.
Note that atFirst() and atLast() refer to the iterator's arbitrary
ordering, not to the cache's internal least recently used list.
See also QCache, Collection Classes, and Non-GUI Classes.
MEMBER FUNCTION DOCUMENTATIONQCacheIterator::QCacheIterator ( const QCache<type> & cache )
Constructs an iterator for cache. The current iterator item is set to
point to the first item in the cache.
QCacheIterator::QCacheIterator ( const QCacheIterator<type> & ci )
Constructs an iterator for the same cache as ci. The new iterator
starts at the same item as ci.current(), but moves independently from
there on.
bool QCacheIterator::atFirst () const
Returns TRUE if the iterator points to the first item in the cache;
otherwise returns FALSE. Note that this refers to the iterator's
arbitrary ordering, not to the cache's internal least recently used
list.
See also toFirst() and atLast().
bool QCacheIterator::atLast () const
Returns TRUE if the iterator points to the last item in the cache;
otherwise returns FALSE. Note that this refers to the iterator's
arbitrary ordering, not to the cache's internal least recently used
list.
See also toLast() and atFirst().
uint QCacheIterator::count () const
Returns the number of items in the cache on which this iterator
operates.
See also isEmpty().
type * QCacheIterator::current () const
Returns a pointer to the current iterator item.
QString QCacheIterator::currentKey () const
Returns the key for the current iterator item.
bool QCacheIterator::isEmpty () const
Returns TRUE if the cache is empty, i.e. count() == 0; otherwise it
returns FALSE.
See also count().
QCacheIterator::operator type * () const
Cast operator. Returns a pointer to the current iterator item. Same as
current().
type * QCacheIterator::operator() ()
Makes the succeeding item current and returns the original current
item.
If the current iterator item was the last item in the cache or if it
was 0, 0 is returned.
type * QCacheIterator::operator++ ()
Prefix++ makes the iterator point to the item just after current() and
makes that the new current item for the iterator. If current() was the
last item, operator++() returns 0.
type * QCacheIterator::operator+= ( uint jump )
Returns the item jump positions after the current item, or 0 if it is
beyond the last item. Makes this the current item.
type * QCacheIterator::operator-- ()
Prefix-- makes the iterator point to the item just before current() and
makes that the new current item for the iterator. If current() was the
first item, operator--() returns 0.
type * QCacheIterator::operator-= ( uint jump )
Returns the item jump positions before the current item, or 0 if it is
before the first item. Makes this the current item.
QCacheIterator<type> & QCacheIterator::operator= ( const QCacheIterator<type>
& ci )
Makes this an iterator for the same cache as ci. The new iterator
starts at the same item as ci.current(), but moves independently
thereafter.
type * QCacheIterator::toFirst ()
Sets the iterator to point to the first item in the cache and returns a
pointer to the item.
Sets the iterator to 0 and returns 0 if the cache is empty.
See also toLast() and isEmpty().
type * QCacheIterator::toLast ()
Sets the iterator to point to the last item in the cache and returns a
pointer to the item.
Sets the iterator to 0 and returns 0 if the cache is empty.
See also toFirst() and isEmpty().
SEE ALSO
http://doc.trolltech.com/qcacheiterator.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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If you find errors in this manual page, please report them to qt-
bugs@trolltech.com. Please include the name of the manual page
(qcacheiterator.3qt) and the Qt version (3.3.8).
Trolltech AS 2 February 2007 QCacheIterator(3qt)