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# qgcache.h

This is the verbatim text of the qgcache.h include file. It is provided only for illustration; the copyright remains with Trolltech.

    /****************************************************************************
    ** $Id: qt/src/tools/qgcache.h   2.3.2   edited 2001-01-26 $
    **
    ** Definition of QGCache and QGCacheIterator classes
    **
    ** Created : 950208
    **
    ** Copyright (C) 1992-2000 Trolltech AS.  All rights reserved.
    **
    ** This file is part of the tools module of the Qt GUI Toolkit.
    **
    ** This file may be distributed under the terms of the Q Public License
    ** as defined by Trolltech AS of Norway and appearing in the file
    ** LICENSE.QPL included in the packaging of this file.
    **
    ** This file may be distributed and/or modified under the terms of the
    ** GNU General Public License version 2 as published by the Free Software
    ** Foundation and appearing in the file LICENSE.GPL included in the
    ** packaging of this file.
    **
    ** Licensees holding valid Qt Enterprise Edition or Qt Professional Edition
    ** licenses may use this file in accordance with the Qt Commercial License
    ** Agreement provided with the Software.
    **
    ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
    ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
    **
    ** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
    **   information about Qt Commercial License Agreements.
    ** See http://www.trolltech.com/qpl/ for QPL licensing information.
    ** See http://www.trolltech.com/gpl/ for GPL licensing information.
    **
    ** Contact info@trolltech.com if any conditions of this licensing are
    ** not clear to you.
    **
    **********************************************************************/

    #ifndef QGCACHE_H
    #define QGCACHE_H

    #ifndef QT_H
    #include "qcollection.h"
    #include "qglist.h"
    #include "qgdict.h"
    #endif // QT_H

    class QCList;                                   // internal classes
    class QCListIt;
    class QCDict;

    class Q_EXPORT QGCache : public QCollection     // generic LRU cache
    {
    friend class QGCacheIterator;
    protected:
        enum KeyType { StringKey, AsciiKey, IntKey, PtrKey };
          // identical to QGDict's, but PtrKey is not used at the moment

        QGCache( int maxCost, uint size, KeyType kt, bool caseSensitive,
                 bool copyKeys );
        QGCache( const QGCache & );                 // not allowed, calls fatal()
       ~QGCache();
        QGCache &operator=( const QGCache & );      // not allowed, calls fatal()

        uint    count()     const   { return ((QGDict*)dict)->count(); }
        uint    size()      const   { return ((QGDict*)dict)->size(); }
        int     maxCost()   const   { return mCost; }
        int     totalCost() const   { return tCost; }
        void    setMaxCost( int maxCost );
        void    clear();

        bool    insert_string( const QString &key, QCollection::Item,
                               int cost, int priority );
        bool    insert_other( const char *key, QCollection::Item,
                              int cost, int priority );
        bool    remove_string( const QString &key );
        bool    remove_other( const char *key );
        QCollection::Item take_string( const QString &key );
        QCollection::Item take_other( const char *key );

        QCollection::Item find_string( const QString &key, bool ref=TRUE ) const;
        QCollection::Item find_other( const char *key, bool ref=TRUE ) const;

        void    statistics() const;

    private:
        bool    makeRoomFor( int cost, int priority = -1 );
        KeyType keytype;
        QCList *lruList;
        QCDict *dict;
        int     mCost;
        int     tCost;
        bool    copyk;
    };

    class Q_EXPORT QGCacheIterator                  // generic cache iterator
    {
    protected:
        QGCacheIterator( const QGCache & );
        QGCacheIterator( const QGCacheIterator & );
       ~QGCacheIterator();
        QGCacheIterator &operator=( const QGCacheIterator & );

        uint              count()   const;
        bool              atFirst() const;
        bool              atLast()  const;
        QCollection::Item toFirst();
        QCollection::Item toLast();

        QCollection::Item get() const;
        QString           getKeyString() const;
        const char       *getKeyAscii()  const;
        long              getKeyInt()    const;

        QCollection::Item operator()();
        QCollection::Item operator++();
        QCollection::Item operator+=( uint );
        QCollection::Item operator--();
        QCollection::Item operator-=( uint );

    protected:
        QCListIt *it;                               // iterator on cache list
    };

    #endif // QGCACHE_H