QCacheIterator Class Reference
The QCacheIterator class provides an iterator for QCache collections.
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#include <qcache.h>
Inherits QGCacheIterator.
List of all member functions.
Public Members
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QCacheIterator<type>&Â
operator= ( const QCacheIterator<type> & ci )Â
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Detailed 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, current() and currentKey() to access the current
cache item and its key, atFirst() and atLast() which return TRUE if
the iterator points to the first/last item in the cache, isEmpty()
which returns TRUE if the cache is empty and finally count() which
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 LRU list.
See also QCache.
Member Function Documentation
QCacheIterator::QCacheIterator ( const QCache<type> & cache )
Constructs an iterator for cache. The current iterator item is
set to point on the first item in the cache (or rather, the first
item is defined to be the item at which this constructor sets the
iterator to point).
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.
QCacheIterator::operator type * () const
Cast operator. Returns a pointer to the current iterator item.
Same as current().
bool QCacheIterator::atFirst () const
Returns TRUE if the iterator points to the first item in the
cache. Note that this refers to the iterator's arbitrary ordering,
not to the cache's internal LRU list.
See also toFirst() and atLast().
bool QCacheIterator::atLast () const
Returns TRUE if the iterator points to the last item in the
cache. Note that this refers to the iterator's arbitrary ordering,
not to the cache's internal LRU 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
FALSE.
See also count().
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 null, null 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 null 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 null if
it is beyond 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 null and returns null if 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 null and returns null if if the cache is empty.
See also toFirst() and isEmpty().
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