qcacheiterator.3qt

Qt/Embedded是一个多平台的C++图形用户界面应用程序框架

.TH QCacheIterator 3qt "10 November 2000" "Trolltech AS" \" -*- nroff -*-
.\" Copyright 1992-2000 Trolltech AS.  All rights reserved.  See the
.\" license file included in the distribution for a complete license
.\" statement.
.\"
.ad l
.nh
.SH NAME
QCacheIterator \- Iterator for QCache collections
.SH SYNOPSIS
.br
.PP
\fC#include <qcache.h>\fR
.PP
Inherits QGCacheIterator.
.PP
.SS "Public Members"
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.BI "\fBQCacheIterator\fR ( const QCache<type> & cache ) "
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.BI "\fBQCacheIterator\fR ( const QCacheIterator<type> & ci ) "
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.BI "QCacheIterator<type>& \fBoperator=\fR ( const QCacheIterator<type> & ci ) "
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.BI "uint \fBcount\fR () const"
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.BI "bool \fBisEmpty\fR () const"
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.BI "bool \fBatFirst\fR () const"
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.BI "bool \fBatLast\fR () const"
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.BI "type* \fBtoFirst\fR () "
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.BI "type* \fBtoLast\fR () "
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.BI "operator \fBtype*\fR ()const"
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.BI "type* \fBcurrent\fR () const"
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.BI "QString \fBcurrentKey\fR () const"
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.BI "type* \fBoperator\fR () "
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.BI "type* \fBoperator++\fR () "
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.BI "type* \fBoperator+=\fR ( uint jump ) "
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.BI "type* \fBoperator--\fR () "
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.BI "type* \fBoperator-=\fR ( uint jump ) "
.br
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.SH DESCRIPTION
The QCacheIterator class provides an iterator for QCache collections.
.PP
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.
.PP
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.
.PP
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.
.PP
Note that atFirst() and atLast() refer to the iterator's arbitrary ordering, not to the cache's internal LRU list.
.PP
See also QCache.
.SH MEMBER FUNCTION DOCUMENTATION
.SH "QCacheIterator::QCacheIterator ( const QCache<type> & cache )"
Constructs an iterator for \fIcache.\fR The current iterator item is set to point on the first item in the \fIcache\fR (or rather, the first item is defined to be the item at which this constructor sets the iterator to point).
.SH "QCacheIterator::QCacheIterator ( const QCacheIterator<type> & ci )"
Constructs an iterator for the same cache as \fIci.\fR The new iterator starts at the same item as ci.current(), but moves independently from there on.
.SH "QCacheIterator::operator type * () const"
Cast operator. Returns a pointer to the current iterator item. Same as current().
.SH "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.
.PP
See also toFirst() and atLast().
.SH "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.
.PP
See also toLast() and atFirst().
.SH "uint QCacheIterator::count () const"
Returns the number of items in the cache on which this iterator operates.
.PP
See also isEmpty().
.SH "type * QCacheIterator::current () const"
Returns a pointer to the current iterator item.
.SH "QString QCacheIterator::currentKey () const"
Returns the key for the current iterator item.
.SH "bool QCacheIterator::isEmpty () const"
Returns TRUE if the cache is empty, i.e. count() == 0, otherwise FALSE.
.PP
See also count().
.SH "type * QCacheIterator::operator() ()"
Makes the succeeding item current and returns the original current item.
.PP
If the current iterator item was the last item in the cache or if it was null, null is returned.
.SH "type * QCacheIterator::operator++ ()"
Prefix ++ makes the iterator point to the item just after \fIcurrent(),\fR and makes that the new current item for the iterator. If current() was the last item, operator--() returns 0.
.SH "type * QCacheIterator::operator+= ( uint jump )"
Returns the item \fIjump\fR positions after the current item, or null if it is beyond the last item. Makes this the current item.
.SH "type * QCacheIterator::operator-- ()"
Prefix -- makes the iterator point to the item just before \fIcurrent(),\fR and makes that the new current item for the iterator. If current() was the first item, operator--() returns 0.
.SH "type * QCacheIterator::operator-= ( uint jump )"
Returns the item \fIjump\fR positions before the current item, or null if it is beyond the first item. Makes this the current item.
.SH "QCacheIterator<type>& QCacheIterator::operator= ( const QCacheIterator<type> & ci )"
Makes this an iterator for the same cache as \fIci.\fR The new iterator starts at the same item as ci.current(), but moves independently thereafter.
.SH "type * QCacheIterator::toFirst ()"
Sets the iterator to point to the first item in the cache and returns a pointer to the item.
.PP
Sets the iterator to null and returns null if if the cache is empty.
.PP
See also toLast() and isEmpty().
.SH "type * QCacheIterator::toLast ()"
Sets the iterator to point to the last item in the cache and returns a pointer to the item.
.PP
Sets the iterator to null and returns null if if the cache is empty.
.PP
See also  toFirst() and isEmpty().
.SH "SEE ALSO"
.BR http://doc.trolltech.com/qcacheiterator.html
.SH COPYRIGHT
Copyright 1992-2000 Trolltech AS, http://www.trolltech.com/.  See the
license file included in the distribution for a complete license
statement.
.SH AUTHOR
Generated automatically from the source code.