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# qvaluelist.h

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

    /****************************************************************************
    ** $Id: qt/src/tools/qvaluelist.h   2.3.1   edited 2001-01-26 $
    **
    ** Definition of QValueList class
    **
    ** Created : 990406
    **
    ** 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 QVALUELIST_H
    #define QVALUELIST_H

    #ifndef QT_H
    #include "qshared.h"
    #include "qdatastream.h"
    #endif // QT_H

    #if defined(_CC_MSVC_)
    #pragma warning(disable:4284) // "return type for operator -> is not a UDT"
    #endif

    template <class T>
    class Q_EXPORT QValueListNode
    {
    public:
        QValueListNode( const T& t ) : data( t ) { }
        QValueListNode() { }
    #if defined(Q_TEMPLATEDLL)
        // Workaround MS bug in memory de/allocation in DLL vs. EXE
        virtual ~QValueListNode() { }
    #endif

        QValueListNode<T>* next;
        QValueListNode<T>* prev;
        T data;
    };

    template<class T>
    class Q_EXPORT QValueListIterator
    {
     public:
        /**
         * Typedefs
         */
        typedef QValueListNode<T>* NodePtr;

        /**
         * Variables
         */
        NodePtr node;

        /**
         * Functions
         */
        QValueListIterator() : node( 0 ) {}
        QValueListIterator( NodePtr p ) : node( p ) {}
        QValueListIterator( const QValueListIterator<T>& it ) : node( it.node ) {}

        bool operator==( const QValueListIterator<T>& it ) const { return node == it.node; }
        bool operator!=( const QValueListIterator<T>& it ) const { return node != it.node; }
        const T& operator*() const { return node->data; }
        T& operator*() { return node->data; }

        // Compilers are too dumb to understand this for QValueList<int>
        //T* operator->() const { return &(node->data); }

        QValueListIterator<T>& operator++() {
            node = node->next;
            return *this;
        }

        QValueListIterator<T> operator++(int) {
            QValueListIterator<T> tmp = *this;
            node = node->next;
            return tmp;
        }

        QValueListIterator<T>& operator--() {
            node = node->prev;
            return *this;
        }

        QValueListIterator<T> operator--(int) {
            QValueListIterator<T> tmp = *this;
            node = node->prev;
            return tmp;
        }
    };

    template<class T>
    class Q_EXPORT QValueListConstIterator
    {
     public:
        /**
         * Typedefs
         */
        typedef QValueListNode<T>* NodePtr;

        /**
         * Variables
         */
        NodePtr node;

        /**
         * Functions
         */
        QValueListConstIterator() : node( 0 ) {}
        QValueListConstIterator( NodePtr p ) : node( p ) {}
        QValueListConstIterator( const QValueListConstIterator<T>& it ) : node( it.node ) {}
        QValueListConstIterator( const QValueListIterator<T>& it ) : node( it.node ) {}

        bool operator==( const QValueListConstIterator<T>& it ) const { return node == it.node; }
        bool operator!=( const QValueListConstIterator<T>& it ) const { return node != it.node; }
        const T& operator*() const { return node->data; }

        // Compilers are too dumb to understand this for QValueList<int>
        //const T* operator->() const { return &(node->data); }

        QValueListConstIterator<T>& operator++() {
            node = node->next;
            return *this;
        }

        QValueListConstIterator<T> operator++(int) {
            QValueListConstIterator<T> tmp = *this;
            node = node->next;
            return tmp;
        }

        QValueListConstIterator<T>& operator--() {
            node = node->prev;
            return *this;
        }

        QValueListConstIterator<T> operator--(int) {
            QValueListConstIterator<T> tmp = *this;
            node = node->prev;
            return tmp;
        }
    };

    template <class T>
    class Q_EXPORT QValueListPrivate : public QShared
    {
    public:
        /**
         * Typedefs
         */
        typedef QValueListIterator<T> Iterator;
        typedef QValueListConstIterator<T> ConstIterator;
        typedef QValueListNode<T> Node;
        typedef QValueListNode<T>* NodePtr;

        /**
         * Functions
         */
        QValueListPrivate() { node = new Node; node->next = node->prev = node; nodes = 0; }
        QValueListPrivate( const QValueListPrivate<T>& _p ) : QShared() {
            node = new Node; node->next = node->prev = node; nodes = 0;
            Iterator b( _p.node->next );
            Iterator e( _p.node );
            Iterator i( node );
            while( b != e )
                insert( i, *b++ );
        }

        void derefAndDelete() // ### hack to get around hp-cc brain damage
        {
            if ( deref() )
                delete this;
        }

    #if defined(Q_TEMPLATEDLL)
        // Workaround MS bug in memory de/allocation in DLL vs. EXE
        virtual
    #endif
        ~QValueListPrivate() {
            NodePtr p = node->next;
            while( p != node ) {
                NodePtr x = p->next;
                delete p;
                p = x;
            }
            delete node;
        }

        Iterator insert( Iterator it, const T& x ) {
            NodePtr p = new Node( x );
            p->next = it.node;
            p->prev = it.node->prev;
            it.node->prev->next = p;
            it.node->prev = p;
            nodes++;
            return p;
        }

        Iterator remove( Iterator it ) {
            ASSERT ( it.node != node );
            NodePtr next = it.node->next;
            NodePtr prev = it.node->prev;
            prev->next = next;
            next->prev = prev;
            delete it.node;
            nodes--;
            return Iterator( next );
        }

        NodePtr find( NodePtr start, const T& x ) const {
            ConstIterator first( start );
            ConstIterator last( node );
            while( first != last) {
                if ( *first == x )
                    return first.node;
                ++first;
            }
            return last.node;
        }

        int findIndex( NodePtr start, const T& x ) const {
            ConstIterator first( start );
            ConstIterator last( node );
            int pos = 0;
            while( first != last) {
                if ( *first == x )
                    return pos;
                ++first;
                ++pos;
            }
            return -1;
        }

        uint contains( const T& x ) const {
            uint result = 0;
            Iterator first = Iterator( node->next );
            Iterator last = Iterator( node );
            while( first != last) {
                if ( *first == x )
                    ++result;
                ++first;
            }
            return result;
        }

        void remove( const T& x ) {
            Iterator first = Iterator( node->next );
            Iterator last = Iterator( node );
            while( first != last) {
                if ( *first == x )
                    first = remove( first );
                else
                    ++first;
            }
        }

        NodePtr at( uint i ) const {
            ASSERT( i <= nodes );
            NodePtr p = node->next;
            for( uint x = 0; x < i; ++x )
                p = p->next;
            return p;
        }

        void clear() {
            nodes = 0;
            NodePtr p = node->next;
            while( p != node ) {
                NodePtr next = p->next;
                delete p;
                p = next;
            }
            node->next = node->prev = node;
        }

        NodePtr node;
        uint nodes;
    };

    template <class T>
    class Q_EXPORT QValueList
    {
    public:
        /**
         * Typedefs
         */
        typedef QValueListIterator<T> Iterator;
        typedef QValueListConstIterator<T> ConstIterator;
        typedef T ValueType;

        /**
         * API
         */
        QValueList() { sh = new QValueListPrivate<T>; }
        QValueList( const QValueList<T>& l ) { sh = l.sh; sh->ref(); }
        ~QValueList() { sh->derefAndDelete(); }

        QValueList<T>& operator= ( const QValueList<T>& l )
        {
            l.sh->ref();
            sh->derefAndDelete();
            sh = l.sh;
            return *this;
        }

        QValueList<T> operator+ ( const QValueList<T>& l ) const
        {
            QValueList<T> l2( *this );
            for( ConstIterator it = l.begin(); it != l.end(); ++it )
                l2.append( *it );
            return l2;
        }

        QValueList<T>& operator+= ( const QValueList<T>& l )
        {
            for( ConstIterator it = l.begin(); it != l.end(); ++it )
                append( *it );
            return *this;
        }

        bool operator== ( const QValueList<T>& l ) const
        {
            if ( count() != l.count() )
                return FALSE;
            ConstIterator it2 = begin();
            ConstIterator it = l.begin();
            for( ; it != l.end(); ++it, ++it2 )
                if ( !( *it == *it2 ) )
                    return FALSE;
            return TRUE;
        }

        bool operator!= ( const QValueList<T>& l ) const { return !( *this == l ); }

        Iterator begin() { detach(); return Iterator( sh->node->next ); }
        ConstIterator begin() const { return ConstIterator( sh->node->next ); }
        Iterator end() { detach(); return Iterator( sh->node ); }
        ConstIterator end() const { return ConstIterator( sh->node ); }
        Iterator fromLast() { detach(); return Iterator( sh->node->prev ); }
        ConstIterator fromLast() const { return ConstIterator( sh->node->prev ); }

        bool isEmpty() const { return ( sh->nodes == 0 ); }

        Iterator insert( Iterator it, const T& x ) { detach(); return sh->insert( it, x ); }

        Iterator append( const T& x ) { detach(); return sh->insert( end(), x ); }
        Iterator prepend( const T& x ) { detach(); return sh->insert( begin(), x ); }

        Iterator remove( Iterator it ) { detach(); return sh->remove( it ); }
        void remove( const T& x ) { detach(); sh->remove( x ); }

        T& first() { detach(); return sh->node->next->data; }
        const T& first() const { return sh->node->next->data; }
        T& last() { detach(); return sh->node->prev->data; }
        const T& last() const { return sh->node->prev->data; }

        T& operator[] ( uint i ) { detach(); return sh->at(i)->data; }
        const T& operator[] ( uint i ) const { return sh->at(i)->data; }
        Iterator at( uint i ) { detach(); return Iterator( sh->at(i) ); }
        ConstIterator at( uint i ) const { return ConstIterator( sh->at(i) ); }
        Iterator find ( const T& x ) { detach(); return Iterator( sh->find( sh->node->next, x) ); }
        ConstIterator find ( const T& x ) const { return ConstIterator( sh->find( sh->node->next, x) ); }
        Iterator find ( Iterator it, const T& x ) { detach(); return Iterator( sh->find( it.node, x ) ); }
        ConstIterator find ( ConstIterator it, const T& x ) const { return ConstIterator( sh->find( it.node, x ) ); }
        int findIndex( const T& x ) const { return sh->findIndex( sh->node->next, x) ; }
        uint contains( const T& x ) const { return sh->contains( x ); }

        uint count() const { return sh->nodes; }

        void clear() { if ( sh->count == 1 ) sh->clear(); else { sh->deref(); sh = new QValueListPrivate<T>; } }

        QValueList<T>& operator+= ( const T& x )
        {
            append( x );
            return *this;
        }
        QValueList<T>& operator<< ( const T& x )
        {
            append( x );
            return *this;
        }

    protected:
        /**
         * Helpers
         */
        void detach() { if ( sh->count > 1 ) { sh->deref(); sh = new QValueListPrivate<T>( *sh ); } }

        /**
         * Variables
         */
        QValueListPrivate<T>* sh;
    };

    #ifndef QT_NO_DATASTREAM
    template<class T>
    inline QDataStream& operator>>( QDataStream& s, QValueList<T>& l )
    {
        l.clear();
        Q_UINT32 c;
        s >> c;
        for( Q_UINT32 i = 0; i < c; ++i )
        {
            T t;
            s >> t;
            l.append( t );
        }
        return s;
    }

    template<class T>
    inline QDataStream& operator<<( QDataStream& s, const QValueList<T>& l )
    {
        s << (Q_UINT32)l.count();
        QValueListConstIterator<T> it = l.begin();
        for( ; it != l.end(); ++it )
            s << *it;
        return s;
    }
    #endif // QT_NO_DATASTREAM
    #endif // QVALUELIST_H