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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/qvaluelist.h   3.0.6   edited Jul 15 02:48 $
    **
    ** 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 "qtl.h"
    #include "qshared.h"
    #include "qdatastream.h"
    #endif // QT_H

    #ifndef QT_NO_STL
    #include <iterator>
    #include <list>
    #endif

    //#define QT_CHECK_VALUELIST_RANGE

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

    template <class T>
    class 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 QValueListIterator
    {
     public:
        /**
         * Typedefs
         */
        typedef QValueListNode<T>* NodePtr;
    #ifndef QT_NO_STL
        typedef std::bidirectional_iterator_tag  iterator_category;
    #endif
        typedef T        value_type;
        typedef size_t size_type;
    #ifndef QT_NO_STL
        typedef ptrdiff_t  difference_type;
    #else
        typedef int difference_type;
    #endif
        typedef T*   pointer;
        typedef T& reference;

        /**
         * 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; }
        // UDT for T = x*
        // 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 QValueListConstIterator
    {
     public:
        /**
         * Typedefs
         */
        typedef QValueListNode<T>* NodePtr;
    #ifndef QT_NO_STL
        typedef std::bidirectional_iterator_tag  iterator_category;
    #endif
        typedef T        value_type;
        typedef size_t size_type;
    #ifndef QT_NO_STL
        typedef ptrdiff_t  difference_type;
    #else
        typedef int difference_type;
    #endif
        typedef const T*   pointer;
        typedef const T& reference;

        /**
         * 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; }
        // UDT for T = x*
        // 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 QValueListPrivate
        : public QShared
    {
    public:
        /**
         * Typedefs
         */
        typedef QValueListIterator<T> Iterator;
        typedef QValueListConstIterator<T> ConstIterator;
        typedef QValueListNode<T> Node;
        typedef QValueListNode<T>* NodePtr;
        typedef size_t size_type;

        /**
         * Functions
         */
        QValueListPrivate();
        QValueListPrivate( const QValueListPrivate<T>& _p );

        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();

        Iterator insert( Iterator it, const T& x );
        Iterator remove( Iterator it );
        NodePtr find( NodePtr start, const T& x ) const;
        int findIndex( NodePtr start, const T& x ) const;
        uint contains( const T& x ) const;
        uint remove( const T& x );
        NodePtr at( size_type i ) const;
        void clear();

        NodePtr node;
        size_type nodes;
    };

    template <class T>
    Q_INLINE_TEMPLATES QValueListPrivate<T>::QValueListPrivate()
    {
        node = new Node; node->next = node->prev = node; nodes = 0;
    }

    template <class T>
    Q_INLINE_TEMPLATES QValueListPrivate<T>::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++ );
    }

    template <class T>
    Q_INLINE_TEMPLATES QValueListPrivate<T>::~QValueListPrivate() {
        NodePtr p = node->next;
        while( p != node ) {
    	NodePtr x = p->next;
    	delete p;
    	p = x;
        }
        delete node;
    }

    template <class T>
    Q_INLINE_TEMPLATES Q_TYPENAME QValueListPrivate<T>::Iterator QValueListPrivate<T>::insert( Q_TYPENAME QValueListPrivate<T>::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;
    }

    template <class T>
    Q_INLINE_TEMPLATES Q_TYPENAME QValueListPrivate<T>::Iterator QValueListPrivate<T>::remove( Q_TYPENAME QValueListPrivate<T>::Iterator it )
    {
        Q_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 );
    }

    template <class T>
    Q_INLINE_TEMPLATES Q_TYPENAME QValueListPrivate<T>::NodePtr QValueListPrivate<T>::find( Q_TYPENAME QValueListPrivate<T>::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;
    }

    template <class T>
    Q_INLINE_TEMPLATES int QValueListPrivate<T>::findIndex( Q_TYPENAME QValueListPrivate<T>::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;
    }

    template <class T>
    Q_INLINE_TEMPLATES uint QValueListPrivate<T>::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;
    }

    template <class T>
    Q_INLINE_TEMPLATES uint QValueListPrivate<T>::remove( const T& x )
    {
        uint result = 0;
        Iterator first = Iterator( node->next );
        Iterator last = Iterator( node );
        while( first != last) {
    	if ( *first == x ) {
    	    first = remove( first );
    	    ++result;
    	} else
    	    ++first;
        }
        return result;
    }

    template <class T>
    Q_INLINE_TEMPLATES Q_TYPENAME QValueListPrivate<T>::NodePtr QValueListPrivate<T>::at( size_type i ) const
    {
        Q_ASSERT( i <= nodes );
        NodePtr p = node->next;
        for( size_type x = 0; x < i; ++x )
    	p = p->next;
        return p;
    }

    template <class T>
    Q_INLINE_TEMPLATES void QValueListPrivate<T>::clear()
    {
        nodes = 0;
        NodePtr p = node->next;
        while( p != node ) {
    	NodePtr next = p->next;
    	delete p;
    	p = next;
        }
        node->next = node->prev = node;
    }

    #ifdef QT_CHECK_RANGE
    # if !defined( QT_NO_DEBUG ) && defined( QT_CHECK_VALUELIST_RANGE )
    #  define QT_CHECK_INVALID_LIST_ELEMENT if ( empty() ) qWarning( "QValueList: Warning invalid element" )
    #  define QT_CHECK_INVALID_LIST_ELEMENT_FATAL Q_ASSERT( !empty() );
    # else
    #  define QT_CHECK_INVALID_LIST_ELEMENT
    #  define QT_CHECK_INVALID_LIST_ELEMENT_FATAL
    # endif
    #else
    # define QT_CHECK_INVALID_LIST_ELEMENT
    # define QT_CHECK_INVALID_LIST_ELEMENT_FATAL
    #endif

    template <class T>
    class QValueList
    {
    public:
        /**
         * Typedefs
         */
        typedef QValueListIterator<T> iterator;
        typedef QValueListConstIterator<T> const_iterator;
        typedef T value_type;
        typedef value_type* pointer;
        typedef const value_type* const_pointer;
        typedef value_type& reference;
        typedef const value_type& const_reference;
        typedef size_t size_type;
    #ifndef QT_NO_STL
        typedef ptrdiff_t  difference_type;
    #else
        typedef int difference_type;
    #endif

        /**
         * API
         */
        QValueList() { sh = new QValueListPrivate<T>; }
        QValueList( const QValueList<T>& l ) { sh = l.sh; sh->ref(); }
    #ifndef QT_NO_STL
    #  ifdef Q_CC_HPACC    // HP-UX aCC does require typename in some place
    #    undef Q_TYPENAME  // but not accept them at others.
    #    define Q_TYPENAME // also doesn't like re-defines ...
    #  endif
        QValueList( const Q_TYPENAME std::list<T>& l )
        {
    	sh = new QValueListPrivate<T>;
    	qCopy( l.begin(), l.end(), std::back_inserter( *this ) );
        }
    #endif
        ~QValueList() { sh->derefAndDelete(); }

        QValueList<T>& operator= ( const QValueList<T>& l )
        {
    	l.sh->ref();
    	sh->derefAndDelete();
    	sh = l.sh;
    	return *this;
        }
    #ifndef QT_NO_STL
        QValueList<T>& operator= ( const Q_TYPENAME std::list<T>& l )
        {
    	detach();
    	qCopy( l.begin(), l.end(), std::back_inserter( *this ) );
    	return *this;
        }
        bool operator== ( const Q_TYPENAME std::list<T>& l ) const
        {
    	if ( size() != l.size() )
    	    return FALSE;
    	const_iterator it2 = begin();
    #if !defined(Q_CC_MIPS)
    	typename
    #endif
    	std::list<T>::const_iterator it = l.begin();
    	for ( ; it2 != end(); ++it2, ++it )
    	if ( !((*it2) == (*it)) )
    	    return FALSE;
    	return TRUE;
        }
    #  ifdef Q_CC_HPACC    // undo the HP-UX aCC hackery done above
    #    undef Q_TYPENAME
    #    define Q_TYPENAME typename
    #  endif
    #endif
        bool operator== ( const QValueList<T>& l ) const;
        bool operator!= ( const QValueList<T>& l ) const { return !( *this == l ); }
        iterator begin() { detach(); return iterator( sh->node->next ); }
        const_iterator begin() const { return const_iterator( sh->node->next ); }
        iterator end() { detach(); return iterator( sh->node ); }
        const_iterator end() const { return const_iterator( sh->node ); }
        iterator insert( iterator it, const T& x ) { detach(); return sh->insert( it, x ); }
        uint remove( const T& x ) { detach(); return sh->remove( x ); }
        void clear();

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

        size_type size() const { return sh->nodes; }
        bool empty() const { return sh->nodes == 0; }
        void push_front( const T& x ) { detach(); sh->insert( begin(), x ); }
        void push_back( const T& x ) { detach(); sh->insert( end(), x ); }
        iterator erase( iterator pos ) { detach(); return sh->remove( pos ); }
        iterator erase( iterator first, iterator last );
        reference front() { QT_CHECK_INVALID_LIST_ELEMENT_FATAL; return *begin(); }
        const_reference front() const { QT_CHECK_INVALID_LIST_ELEMENT_FATAL; return *begin(); }
        reference back() { QT_CHECK_INVALID_LIST_ELEMENT_FATAL; return *(--end()); }
        const_reference back() const { QT_CHECK_INVALID_LIST_ELEMENT_FATAL; return *(--end()); }
        void pop_front() { QT_CHECK_INVALID_LIST_ELEMENT; erase( begin() ); }
        void pop_back() {
    	QT_CHECK_INVALID_LIST_ELEMENT;
    	iterator tmp = end();
    	erase( --tmp );
        }
        void insert( iterator pos, size_type n, const T& x );
        // Some compilers (incl. vc++) would instantiate this function even if
        // it is not used; this would constrain QValueList to classes that provide
        // an operator<
        /*
        void sort()
        {
    	qHeapSort( *this );
        }
        */

        QValueList<T> operator+ ( const QValueList<T>& l ) const;
        QValueList<T>& operator+= ( const QValueList<T>& l );

        iterator fromLast() { detach(); return iterator( sh->node->prev ); }
        const_iterator fromLast() const { return const_iterator( sh->node->prev ); }

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

        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 ); }

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

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

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

        QValueList<T>& operator+= ( const T& x )
        {
    	append( x );
    	return *this;
        }
        typedef QValueListIterator<T> Iterator;
        typedef QValueListConstIterator<T> ConstIterator;
        typedef T ValueType;

    protected:
        /**
         * Helpers
         */
        void detach() { if ( sh->count > 1 ) detachInternal(); }

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

    private:
        void detachInternal();
    };

    template <class T>
    Q_INLINE_TEMPLATES bool QValueList<T>::operator== ( const QValueList<T>& l ) const
    {
        if ( size() != l.size() )
    	return FALSE;
        const_iterator it2 = begin();
        const_iterator it = l.begin();
        for( ; it != l.end(); ++it, ++it2 )
    	if ( !( *it == *it2 ) )
    	    return FALSE;
        return TRUE;
    }

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

    template <class T>
    Q_INLINE_TEMPLATES Q_TYPENAME QValueList<T>::iterator QValueList<T>::erase( Q_TYPENAME QValueList<T>::iterator first, Q_TYPENAME QValueList<T>::iterator last )
    {
        while ( first != last )
    	erase( first++ );
        return last;
    }

    template <class T>
    Q_INLINE_TEMPLATES void QValueList<T>::insert( Q_TYPENAME QValueList<T>::iterator pos, size_type n, const T& x )
    {
        for ( ; n > 0; --n )
    	insert( pos, x );
    }

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

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

    template <class T>
    Q_INLINE_TEMPLATES void QValueList<T>::detachInternal()
    {
        sh->deref(); sh = new QValueListPrivate<T>( *sh );
    }

    #ifndef QT_NO_DATASTREAM
    template <class T>
    Q_INLINE_TEMPLATES 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 );
    	if ( s.atEnd() )
    	    break;
        }
        return s;
    }

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