Detailed Description
The QAsciiCacheIterator class provides an iterator for QAsciiCache 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 QAsciiCache. QAsciiCache updates all iterators
that refer an item when that item is removed.
QAsciiCacheIterator provides an operator++() and an operator+=()
to traverse the cache; current() and currentKey() to access the
current cache item and its key. It also provides atFirst() and
atLast(), which 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 QAsciiCache, Collection Classes and Non-GUI Classes.
Member Function Documentation
QAsciiCacheIterator::QAsciiCacheIterator ( const QAsciiCache<type> & cache )
Constructs an iterator for cache. The current iterator item is
set to point to the first item in the cache.
QAsciiCacheIterator::QAsciiCacheIterator ( const QAsciiCacheIterator<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 QAsciiCacheIterator::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 QAsciiCacheIterator::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 QAsciiCacheIterator::count () const
Returns the number of items in the cache over which this iterator
operates.
See also isEmpty().
type * QAsciiCacheIterator::current () const
Returns a pointer to the current iterator item.
const char * QAsciiCacheIterator::currentKey () const
Returns the key for the current iterator item.
bool QAsciiCacheIterator::isEmpty () const
Returns TRUE if the cache is empty, i.e. count() == 0; otherwise
returns FALSE.
See also count().
QAsciiCacheIterator::operator type * () const
Cast operator. Returns a pointer to the current iterator item.
Same as current().
type * QAsciiCacheIterator::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 * QAsciiCacheIterator::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 * QAsciiCacheIterator::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 * QAsciiCacheIterator::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 * QAsciiCacheIterator::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.
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 * QAsciiCacheIterator::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 * QAsciiCacheIterator::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 isEmpty().
This file is part of the Qt toolkit.
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Trolltech. All Rights Reserved.
