Test conversion to TQt3 from Qt3 8c6fc1f8e35fd264dd01c582ca5e7549b32ab731

1 files changed, 866 insertions, 0 deletions

diff --git a/src/tools/qgcache.cpp b/src/tools/qgcache.cpp
new file mode 100644
index 000000000..2465f4a47
--- /dev/null
+++ b/src/tools/qgcache.cpp
@@ -0,0 +1,866 @@
+/****************************************************************************
+**
+** Implementation of TQGCache and TQGCacheIterator classes
+**
+** Created : 950208
+**
+** Copyright (C) 1992-2008 Trolltech ASA.  All rights reserved.
+**
+** This file is part of the tools module of the TQt GUI Toolkit.
+**
+** This file may be used under the terms of the GNU General
+** Public License versions 2.0 or 3.0 as published by the Free
+** Software Foundation and appearing in the files LICENSE.GPL2
+** and LICENSE.GPL3 included in the packaging of this file.
+** Alternatively you may (at your option) use any later version
+** of the GNU General Public License if such license has been
+** publicly approved by Trolltech ASA (or its successors, if any)
+** and the KDE Free TQt Foundation.
+**
+** Please review the following information to ensure GNU General
+** Public Licensing retquirements will be met:
+** http://trolltech.com/products/qt/licenses/licensing/opensource/.
+** If you are unsure which license is appropriate for your use, please
+** review the following information:
+** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
+** or contact the sales department at sales@trolltech.com.
+**
+** This file may be used under the terms of the Q Public License as
+** defined by Trolltech ASA and appearing in the file LICENSE.TQPL
+** included in the packaging of this file.  Licensees holding valid TQt
+** Commercial licenses may use this file in accordance with the TQt
+** Commercial License Agreement provided with the Software.
+**
+** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
+** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
+** herein.
+**
+**********************************************************************/
+
+#include "qgcache.h"
+#include "qptrlist.h"
+#include "qdict.h"
+#include "qstring.h"
+
+/*!
+  \class TQGCache qgcache.h
+  \reentrant
+  \ingroup shared
+  \ingroup collection
+  \brief The TQGCache class is an internal class for implementing TQCache
+  template classes.
+
+  \internal
+
+  TQGCache is a strictly internal class that acts as a base class for the
+  \link collection.html collection classes\endlink TQCache and TQIntCache.
+*/
+
+
+/*****************************************************************************
+  TQGCacheItem class (internal cache item)
+ *****************************************************************************/
+
+struct TQCacheItem
+{
+    TQCacheItem( void *k, TQPtrCollection::Item d, int c, short p )
+	: priority(p), skipPriority(p), cost(c), key(k), data(d), node(0) {}
+    short	priority;
+    short	skipPriority;
+    int		cost;
+    void       *key;
+    TQPtrCollection::Item data;
+    TQLNode     *node;
+};
+
+
+/*****************************************************************************
+  TQCList class (internal list of cache items)
+ *****************************************************************************/
+
+class TQCList : private TQPtrList<TQCacheItem>
+{
+friend class TQGCacheIterator;
+friend class TQCListIt;
+public:
+    TQCList()	{}
+   ~TQCList();
+
+    void	insert( TQCacheItem * );		// insert according to priority
+    void	insert( int, TQCacheItem * );
+    void	take( TQCacheItem * );
+    void	reference( TQCacheItem * );
+
+    void	setAutoDelete( bool del ) { TQPtrCollection::setAutoDelete(del); }
+
+    bool	removeFirst()	{ return TQPtrList<TQCacheItem>::removeFirst(); }
+    bool	removeLast()	{ return TQPtrList<TQCacheItem>::removeLast(); }
+
+    TQCacheItem *first()		{ return TQPtrList<TQCacheItem>::first(); }
+    TQCacheItem *last()		{ return TQPtrList<TQCacheItem>::last(); }
+    TQCacheItem *prev()		{ return TQPtrList<TQCacheItem>::prev(); }
+    TQCacheItem *next()		{ return TQPtrList<TQCacheItem>::next(); }
+
+#if defined(QT_DEBUG)
+    int		inserts;			// variables for statistics
+    int		insertCosts;
+    int		insertMisses;
+    int		finds;
+    int		hits;
+    int		hitCosts;
+    int		dumps;
+    int		dumpCosts;
+#endif
+};
+
+
+TQCList::~TQCList()
+{
+#if defined(QT_DEBUG)
+    Q_ASSERT( count() == 0 );
+#endif
+}
+
+
+void TQCList::insert( TQCacheItem *ci )
+{
+    TQCacheItem *item = first();
+    while( item && item->skipPriority > ci->priority ) {
+	item->skipPriority--;
+	item = next();
+    }
+    if ( item )
+	TQPtrList<TQCacheItem>::insert( at(), ci );
+    else
+	append( ci );
+#if defined(QT_DEBUG)
+    Q_ASSERT( ci->node == 0 );
+#endif
+    ci->node = currentNode();
+}
+
+inline void TQCList::insert( int i, TQCacheItem *ci )
+{
+    TQPtrList<TQCacheItem>::insert( i, ci );
+#if defined(QT_DEBUG)
+    Q_ASSERT( ci->node == 0 );
+#endif
+    ci->node = currentNode();
+}
+
+
+void TQCList::take( TQCacheItem *ci )
+{
+    if ( ci ) {
+#if defined(QT_DEBUG)
+	Q_ASSERT( ci->node != 0 );
+#endif
+	takeNode( ci->node );
+	ci->node = 0;
+    }
+}
+
+
+inline void TQCList::reference( TQCacheItem *ci )
+{
+#if defined(QT_DEBUG)
+    Q_ASSERT( ci != 0 && ci->node != 0 );
+#endif
+    ci->skipPriority = ci->priority;
+    relinkNode( ci->node );			// relink as first item
+}
+
+
+class TQCListIt: public TQPtrListIterator<TQCacheItem>
+{
+public:
+    TQCListIt( const TQCList *p ): TQPtrListIterator<TQCacheItem>( *p ) {}
+    TQCListIt( const TQCListIt *p ): TQPtrListIterator<TQCacheItem>( *p ) {}
+};
+
+
+/*****************************************************************************
+  TQCDict class (internal dictionary of cache items)
+ *****************************************************************************/
+
+//
+// Since we need to decide if the dictionary should use an int or const
+// char * key (the "bool trivial" argument in the constructor below)
+// we cannot use the macro/template dict, but inherit directly from TQGDict.
+//
+
+class TQCDict : public TQGDict
+{
+public:
+    TQCDict( uint size, uint kt, bool caseSensitive, bool copyKeys )
+	: TQGDict( size, (KeyType)kt, caseSensitive, copyKeys ) {}
+    ~TQCDict();
+
+    void clear() { TQGDict::clear(); }
+
+    TQCacheItem *find_string(const TQString &key) const
+	{ return (TQCacheItem*)((TQCDict*)this)->look_string(key, 0, 0); }
+    TQCacheItem *find_ascii(const char *key) const
+	{ return (TQCacheItem*)((TQCDict*)this)->look_ascii(key, 0, 0); }
+    TQCacheItem *find_int(long key) const
+	{ return (TQCacheItem*)((TQCDict*)this)->look_int(key, 0, 0); }
+
+    TQCacheItem *take_string(const TQString &key)
+	{ return (TQCacheItem*)TQGDict::take_string(key); }
+    TQCacheItem *take_ascii(const char *key)
+	{ return (TQCacheItem*)TQGDict::take_ascii(key); }
+    TQCacheItem *take_int(long key)
+	{ return (TQCacheItem*)TQGDict::take_int(key); }
+
+    bool  insert_string( const TQString &key, const TQCacheItem *ci )
+	{ return TQGDict::look_string(key,(Item)ci,1)!=0;}
+    bool  insert_ascii( const char *key, const TQCacheItem *ci )
+	{ return TQGDict::look_ascii(key,(Item)ci,1)!=0;}
+    bool  insert_int( long key, const TQCacheItem *ci )
+	{ return TQGDict::look_int(key,(Item)ci,1)!=0;}
+
+    bool  remove_string( TQCacheItem *item )
+	{ return TQGDict::remove_string(*((TQString*)(item->key)),item); }
+    bool  remove_ascii( TQCacheItem *item )
+	{ return TQGDict::remove_ascii((const char *)item->key,item); }
+    bool  remove_int( TQCacheItem *item )
+	{ return TQGDict::remove_int((long)item->key,item);}
+
+    void  statistics()			{ TQGDict::statistics(); }
+
+private:
+    void deleteItem( void *item )
+	{ if ( del_item ) { TQCacheItem *d = (TQCacheItem*)item; delete d; } }
+};
+
+inline TQCDict::~TQCDict()
+{
+    clear();
+}
+
+/*****************************************************************************
+  TQGDict member functions
+ *****************************************************************************/
+
+/*!
+  Constructs a cache.
+  The maximum cost of the cache is given by \a maxCost and the size by \a
+  size. The key type is \a kt which may be \c StringKey, \c AsciiKey,
+  \c IntKey or \c PtrKey. The case-sensitivity of lookups is set with
+  \a caseSensitive. Keys are copied if \a copyKeys is TRUE.
+*/
+
+TQGCache::TQGCache( int maxCost, uint size, KeyType kt, bool caseSensitive,
+		  bool copyKeys )
+{
+    keytype = kt;
+    lruList = new TQCList;
+    Q_CHECK_PTR( lruList );
+    lruList->setAutoDelete( TRUE );
+    copyk   = ((keytype == AsciiKey) && copyKeys);
+    dict    = new TQCDict( size, kt, caseSensitive, FALSE );
+    Q_CHECK_PTR( dict );
+    mCost   = maxCost;
+    tCost   = 0;
+#if defined(QT_DEBUG)
+    lruList->inserts	  = 0;
+    lruList->insertCosts  = 0;
+    lruList->insertMisses = 0;
+    lruList->finds	  = 0;
+    lruList->hits	  = 0;
+    lruList->hitCosts	  = 0;
+    lruList->dumps	  = 0;
+    lruList->dumpCosts	  = 0;
+#endif
+}
+
+/*!
+  Cannot copy a cache.
+*/
+
+TQGCache::TQGCache( const TQGCache & )
+    : TQPtrCollection()
+{
+#if defined(QT_CHECK_NULL)
+    qFatal( "TQGCache::TQGCache(TQGCache &): Cannot copy a cache" );
+#endif
+}
+
+/*!
+  Removes all items from the cache and destroys it.
+*/
+
+TQGCache::~TQGCache()
+{
+    clear();
+    delete dict;
+    delete lruList;
+}
+
+/*!
+  Cannot assign a cache.
+*/
+
+TQGCache &TQGCache::operator=( const TQGCache & )
+{
+#if defined(QT_CHECK_NULL)
+    qFatal( "TQGCache::operator=: Cannot copy a cache" );
+#endif
+    return *this;
+}
+
+
+/*!
+  Returns the number of items in the cache.
+*/
+
+uint TQGCache::count() const
+{
+    return dict->count();
+}
+
+/*!
+  Returns the size of the hash array.
+*/
+
+uint TQGCache::size() const
+{
+    return dict->size();
+}
+
+/*!
+  \fn int TQGCache::maxCost() const
+
+  Returns the maximum cache cost.
+*/
+
+/*!
+  \fn int TQGCache::totalCost() const
+
+  Returns the total cache cost.
+*/
+
+/*!
+  Sets the maximum cache cost to \a maxCost.
+*/
+
+void TQGCache::setMaxCost( int maxCost )
+{
+    if ( maxCost < tCost ) {
+	if ( !makeRoomFor(tCost - maxCost) )	// remove excess cost
+	    return;
+    }
+    mCost = maxCost;
+}
+
+
+/*!
+    Inserts an item with data \a data into the cache using key \a key.
+    The item has cost \a cost and priority \a priority.
+
+  \warning If this function returns FALSE, you must delete \a data
+  yourself.  Additionally, be very careful about using \a data after
+  calling this function, as any other insertions into the cache, from
+  anywhere in the application, or within TQt itself, could cause the
+  data to be discarded from the cache, and the pointer to become
+  invalid.
+*/
+
+bool TQGCache::insert_string( const TQString &key, TQPtrCollection::Item data,
+			     int cost, int priority)
+{
+    if ( tCost + cost > mCost ) {
+	if ( !makeRoomFor(tCost + cost - mCost, priority) ) {
+#if defined(QT_DEBUG)
+	    lruList->insertMisses++;
+#endif
+	    return FALSE;
+	}
+    }
+#if defined(QT_DEBUG)
+    Q_ASSERT( keytype == StringKey );
+    lruList->inserts++;
+    lruList->insertCosts += cost;
+#endif
+    if ( priority < -32768 )
+	priority = -32768;
+    else if ( priority > 32767 )
+	priority = 32677;
+    TQCacheItem *ci = new TQCacheItem( new TQString(key), newItem(data),
+				     cost, (short)priority );
+    Q_CHECK_PTR( ci );
+    lruList->insert( 0, ci );
+    dict->insert_string( key, ci );
+    tCost += cost;
+    return TRUE;
+}
+
+bool TQGCache::insert_other( const char *key, TQPtrCollection::Item data,
+			    int cost, int priority)
+{
+    if ( tCost + cost > mCost ) {
+	if ( !makeRoomFor(tCost + cost - mCost, priority) ) {
+#if defined(QT_DEBUG)
+	    lruList->insertMisses++;
+#endif
+	    return FALSE;
+	}
+    }
+#if defined(QT_DEBUG)
+    Q_ASSERT( keytype != StringKey );
+    lruList->inserts++;
+    lruList->insertCosts += cost;
+#endif
+    if ( keytype == AsciiKey && copyk )
+	key = qstrdup( key );
+    if ( priority < -32768 )
+	priority = -32768;
+    else if ( priority > 32767 )
+	priority = 32677;
+    TQCacheItem *ci = new TQCacheItem( (void*)key, newItem(data), cost,
+				     (short)priority );
+    Q_CHECK_PTR( ci );
+    lruList->insert( 0, ci );
+    if ( keytype == AsciiKey )
+	dict->insert_ascii( key, ci );
+    else
+	dict->insert_int( (long)key, ci );
+    tCost += cost;
+    return TRUE;
+}
+
+
+/*!
+  Removes the item with key \a key from the cache. Returns TRUE if the
+  item was removed; otherwise returns FALSE.
+*/
+
+bool TQGCache::remove_string( const TQString &key )
+{
+    Item d = take_string( key );
+    if ( d )
+	deleteItem( d );
+    return d != 0;
+}
+
+bool TQGCache::remove_other( const char *key )
+{
+    Item d = take_other( key );
+    if ( d )
+	deleteItem( d );
+    return d != 0;
+}
+
+
+/*!
+  Takes the item with key \a key out of the cache. The item is not
+  deleted. If no item has this \a key 0 is returned.
+*/
+
+TQPtrCollection::Item TQGCache::take_string( const TQString &key )
+{
+    TQCacheItem *ci = dict->take_string( key );	// take from dict
+    Item d;
+    if ( ci ) {
+	d = ci->data;
+	tCost -= ci->cost;
+	lruList->take( ci );			// take from list
+	delete (TQString*)ci->key;
+	delete ci;
+    } else {
+	d = 0;
+    }
+    return d;
+}
+
+/*!
+  Takes the item with key \a key out of the cache. The item is not
+  deleted. If no item has this \a key 0 is returned.
+*/
+
+TQPtrCollection::Item TQGCache::take_other( const char *key )
+{
+    TQCacheItem *ci;
+    if ( keytype == AsciiKey )
+	ci = dict->take_ascii( key );
+    else
+	ci = dict->take_int( (long)key );
+    Item d;
+    if ( ci ) {
+	d = ci->data;
+	tCost -= ci->cost;
+	lruList->take( ci );			// take from list
+	if ( copyk )
+	    delete [] (char *)ci->key;
+	delete ci;
+    } else {
+	d = 0;
+    }
+    return d;
+}
+
+
+/*!
+  Clears the cache.
+*/
+
+void TQGCache::clear()
+{
+    TQCacheItem *ci;
+    while ( (ci = lruList->first()) ) {
+	switch ( keytype ) {
+	    case StringKey:
+		dict->remove_string( ci );
+		delete (TQString*)ci->key;
+		break;
+	    case AsciiKey:
+		dict->remove_ascii( ci );
+		if ( copyk )
+		    delete [] (char*)ci->key;
+		break;
+	    case IntKey:
+		dict->remove_int( ci );
+		break;
+	    case PtrKey:			// unused
+		break;
+	}
+	deleteItem( ci->data );			// delete data
+	lruList->removeFirst();			// remove from list
+    }
+    tCost = 0;
+}
+
+
+/*!
+  Finds an item for \a key in the cache and adds a reference if \a ref is TRUE.
+*/
+
+TQPtrCollection::Item TQGCache::find_string( const TQString &key, bool ref ) const
+{
+    TQCacheItem *ci = dict->find_string( key );
+#if defined(QT_DEBUG)
+    lruList->finds++;
+#endif
+    if ( ci ) {
+#if defined(QT_DEBUG)
+	lruList->hits++;
+	lruList->hitCosts += ci->cost;
+#endif
+	if ( ref )
+	    lruList->reference( ci );
+	return ci->data;
+    }
+    return 0;
+}
+
+
+/*!
+  Finds an item for \a key in the cache and adds a reference if \a ref is TRUE.
+*/
+
+TQPtrCollection::Item TQGCache::find_other( const char *key, bool ref ) const
+{
+    TQCacheItem *ci = keytype == AsciiKey ? dict->find_ascii(key)
+					 : dict->find_int((long)key);
+#if defined(QT_DEBUG)
+    lruList->finds++;
+#endif
+    if ( ci ) {
+#if defined(QT_DEBUG)
+	lruList->hits++;
+	lruList->hitCosts += ci->cost;
+#endif
+	if ( ref )
+	    lruList->reference( ci );
+	return ci->data;
+    }
+    return 0;
+}
+
+
+/*!
+  Allocates cache space for one or more items.
+*/
+
+bool TQGCache::makeRoomFor( int cost, int priority )
+{
+    if ( cost > mCost )				// cannot make room for more
+	return FALSE;				//   than maximum cost
+    if ( priority == -1 )
+	priority = 32767;
+    register TQCacheItem *ci = lruList->last();
+    int cntCost = 0;
+    int dumps	= 0;				// number of items to dump
+    while ( cntCost < cost && ci && ci->skipPriority <= priority ) {
+	cntCost += ci->cost;
+	ci	 = lruList->prev();
+	dumps++;
+    }
+    if ( cntCost < cost )			// can enough cost be dumped?
+	return FALSE;				// no
+#if defined(QT_DEBUG)
+    Q_ASSERT( dumps > 0 );
+#endif
+    while ( dumps-- ) {
+	ci = lruList->last();
+#if defined(QT_DEBUG)
+	lruList->dumps++;
+	lruList->dumpCosts += ci->cost;
+#endif
+	switch ( keytype ) {
+	    case StringKey:
+		dict->remove_string( ci );
+		delete (TQString*)ci->key;
+		break;
+	    case AsciiKey:
+		dict->remove_ascii( ci );
+		if ( copyk )
+		    delete [] (char *)ci->key;
+		break;
+	    case IntKey:
+		dict->remove_int( ci );
+		break;
+	    case PtrKey:			// unused
+		break;
+	}
+	deleteItem( ci->data );			// delete data
+	lruList->removeLast();			// remove from list
+    }
+    tCost -= cntCost;
+    return TRUE;
+}
+
+
+/*!
+  Outputs debug statistics.
+*/
+
+void TQGCache::statistics() const
+{
+#if defined(QT_DEBUG)
+    TQString line;
+    line.fill( '*', 80 );
+    qDebug( line.ascii() );
+    qDebug( "CACHE STATISTICS:" );
+    qDebug( "cache contains %d item%s, with a total cost of %d",
+	   count(), count() != 1 ? "s" : "", tCost );
+    qDebug( "maximum cost is %d, cache is %d%% full.",
+	   mCost, (200*tCost + mCost) / (mCost*2) );
+    qDebug( "find() has been called %d time%s",
+	   lruList->finds, lruList->finds != 1 ? "s" : "" );
+    qDebug( "%d of these were hits, items found had a total cost of %d.",
+	   lruList->hits,lruList->hitCosts );
+    qDebug( "%d item%s %s been inserted with a total cost of %d.",
+	   lruList->inserts,lruList->inserts != 1 ? "s" : "",
+	   lruList->inserts != 1 ? "have" : "has", lruList->insertCosts );
+    qDebug( "%d item%s %s too large or had too low priority to be inserted.",
+	   lruList->insertMisses, lruList->insertMisses != 1 ? "s" : "",
+	   lruList->insertMisses != 1 ? "were" : "was" );
+    qDebug( "%d item%s %s been thrown away with a total cost of %d.",
+	   lruList->dumps, lruList->dumps != 1 ? "s" : "",
+	   lruList->dumps != 1 ? "have" : "has", lruList->dumpCosts );
+    qDebug( "Statistics from internal dictionary class:" );
+    dict->statistics();
+    qDebug( line.ascii() );
+#endif
+}
+
+
+/*****************************************************************************
+  TQGCacheIterator member functions
+ *****************************************************************************/
+
+/*!
+  \class TQGCacheIterator qgcache.h
+  \reentrant
+  \ingroup shared
+  \ingroup collection
+  \brief The TQGCacheIterator class is an internal class for implementing TQCacheIterator and
+  TQIntCacheIterator.
+
+  \internal
+
+  TQGCacheIterator is a strictly internal class that does the heavy work for
+  TQCacheIterator and TQIntCacheIterator.
+*/
+
+/*!
+  Constructs an iterator that operates on the cache \a c.
+*/
+
+TQGCacheIterator::TQGCacheIterator( const TQGCache &c )
+{
+    it = new TQCListIt( c.lruList );
+#if defined(QT_DEBUG)
+    Q_ASSERT( it != 0 );
+#endif
+}
+
+/*!
+  Constructs an iterator that operates on the same cache as \a ci.
+*/
+
+TQGCacheIterator::TQGCacheIterator( const TQGCacheIterator &ci )
+{
+    it = new TQCListIt( ci.it );
+#if defined(QT_DEBUG)
+    Q_ASSERT( it != 0 );
+#endif
+}
+
+/*!
+  Destroys the iterator.
+*/
+
+TQGCacheIterator::~TQGCacheIterator()
+{
+    delete it;
+}
+
+/*!
+  Assigns the iterator \a ci to this cache iterator.
+*/
+
+TQGCacheIterator &TQGCacheIterator::operator=( const TQGCacheIterator &ci )
+{
+    *it = *ci.it;
+    return *this;
+}
+
+/*!
+  Returns the number of items in the cache.
+*/
+
+uint TQGCacheIterator::count() const
+{
+    return it->count();
+}
+
+/*!
+  Returns TRUE if the iterator points to the first item.
+*/
+
+bool  TQGCacheIterator::atFirst() const
+{
+    return it->atFirst();
+}
+
+/*!
+  Returns TRUE if the iterator points to the last item.
+*/
+
+bool TQGCacheIterator::atLast() const
+{
+    return it->atLast();
+}
+
+/*!
+  Sets the list iterator to point to the first item in the cache.
+*/
+
+TQPtrCollection::Item TQGCacheIterator::toFirst()
+{
+    TQCacheItem *item = it->toFirst();
+    return item ? item->data : 0;
+}
+
+/*!
+  Sets the list iterator to point to the last item in the cache.
+*/
+
+TQPtrCollection::Item TQGCacheIterator::toLast()
+{
+    TQCacheItem *item = it->toLast();
+    return item ? item->data : 0;
+}
+
+/*!
+  Returns the current item.
+*/
+
+TQPtrCollection::Item TQGCacheIterator::get() const
+{
+    TQCacheItem *item = it->current();
+    return item ? item->data : 0;
+}
+
+/*!
+  Returns the key of the current item.
+*/
+
+TQString TQGCacheIterator::getKeyString() const
+{
+    TQCacheItem *item = it->current();
+    return item ? *((TQString*)item->key) : TQString::null;
+}
+
+/*!
+  Returns the key of the current item, as a \0-terminated C string.
+*/
+
+const char *TQGCacheIterator::getKeyAscii() const
+{
+    TQCacheItem *item = it->current();
+    return item ? (const char *)item->key : 0;
+}
+
+/*!
+  Returns the key of the current item, as a long.
+*/
+
+long TQGCacheIterator::getKeyInt() const
+{
+    TQCacheItem *item = it->current();
+    return item ? (long)item->key : 0;
+}
+
+/*!
+  Moves to the next item (postfix).
+*/
+
+TQPtrCollection::Item TQGCacheIterator::operator()()
+{
+    TQCacheItem *item = it->operator()();
+    return item ? item->data : 0;
+}
+
+/*!
+  Moves to the next item (prefix).
+*/
+
+TQPtrCollection::Item TQGCacheIterator::operator++()
+{
+    TQCacheItem *item = it->operator++();
+    return item ? item->data : 0;
+}
+
+/*!
+  Moves \a jump positions forward.
+*/
+
+TQPtrCollection::Item TQGCacheIterator::operator+=( uint jump )
+{
+    TQCacheItem *item = it->operator+=(jump);
+    return item ? item->data : 0;
+}
+
+/*!
+  Moves to the previous item (prefix).
+*/
+
+TQPtrCollection::Item TQGCacheIterator::operator--()
+{
+    TQCacheItem *item = it->operator--();
+    return item ? item->data : 0;
+}
+
+/*!
+  Moves \a jump positions backward.
+*/
+
+TQPtrCollection::Item TQGCacheIterator::operator-=( uint jump )
+{
+    TQCacheItem *item = it->operator-=(jump);
+    return item ? item->data : 0;
+}