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# qmap.h

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

    /****************************************************************************
    ** $Id:  qt/qmap.h   3.0.3   edited Mar 4 12:05 $
    **
    ** Definition of QMap 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.
    **
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    **   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.
    **
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    **********************************************************************/

    #ifndef QMAP_H
    #define QMAP_H

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

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

    //#define QT_CHECK_MAP_RANGE

    struct QMapNodeBase
    {
        enum Color { Red, Black };

        QMapNodeBase* left;
        QMapNodeBase* right;
        QMapNodeBase* parent;

        Color color;

        QMapNodeBase* minimum() {
    	QMapNodeBase* x = this;
    	while ( x->left )
    	    x = x->left;
    	return x;
        }

        QMapNodeBase* maximum() {
    	QMapNodeBase* x = this;
    	while ( x->right )
    	    x = x->right;
    	return x;
        }
    };

    template <class K, class T>
    struct QMapNode : public QMapNodeBase
    {
        QMapNode( const K& _key, const T& _data ) { data = _data; key = _key; }
        QMapNode( const K& _key )	   { key = _key; }
        QMapNode( const QMapNode<K,T>& _n ) { key = _n.key; data = _n.data; }
        QMapNode() { }
        T data;
        K key;
    };

    template<class K, class T>
    class Q_EXPORT QMapIterator
    {
     public:
        /**
         * Typedefs
         */
        typedef QMapNode< K, T >* NodePtr;
    #ifndef QT_NO_STL
        typedef std::bidirectional_iterator_tag  iterator_category;
    #endif
        typedef T          value_type;
    #ifndef QT_NO_STL
        typedef ptrdiff_t  difference_type;
    #else
        typedef int difference_type;
    #endif
        typedef T*         pointer;
        typedef T&         reference;

        /**
         * Variables
         */
        QMapNode<K,T>* node;

        /**
         * Functions
         */
        QMapIterator() : node( 0 ) {}
        QMapIterator( QMapNode<K,T>* p ) : node( p ) {}
        QMapIterator( const QMapIterator<K,T>& it ) : node( it.node ) {}

        bool operator==( const QMapIterator<K,T>& it ) const { return node == it.node; }
        bool operator!=( const QMapIterator<K,T>& it ) const { return node != it.node; }
        T& operator*() { return node->data; }
        const T& operator*() const { return node->data; }
        // UDT for T = x*
        // T* operator->() const { return &node->data; }

        const K& key() const { return node->key; }
        T& data() { return node->data; }
        const T& data() const { return node->data; }

    private:
        int inc() {
    	QMapNodeBase* tmp = node;
    	if ( tmp->right ) {
    	    tmp = tmp->right;
    	    while ( tmp->left )
    		tmp = tmp->left;
    	} else {
    	    QMapNodeBase* y = tmp->parent;
    	    while (tmp == y->right) {
    		tmp = y;
    		y = y->parent;
    	    }
    	    if (tmp->right != y)
    		tmp = y;
    	}
    	node = (NodePtr)tmp;
    	return 0;
        }

        int dec() {
    	QMapNodeBase* tmp = node;
    	if (tmp->color == QMapNodeBase::Red &&
    	    tmp->parent->parent == tmp ) {
    	    tmp = tmp->right;
    	} else if (tmp->left != 0) {
    	    QMapNodeBase* y = tmp->left;
    	    while ( y->right )
    		y = y->right;
    	    tmp = y;
    	} else {
    	    QMapNodeBase* y = tmp->parent;
    	    while (tmp == y->left) {
    		tmp = y;
    		y = y->parent;
    	    }
    	    tmp = y;
    	}
    	node = (NodePtr)tmp;
    	return 0;
        }

    public:
        QMapIterator<K,T>& operator++() {
    	inc();
    	return *this;
        }

        QMapIterator<K,T> operator++(int) {
    	QMapIterator<K,T> tmp = *this;
    	inc();
    	return tmp;
        }

        QMapIterator<K,T>& operator--() {
    	dec();
    	return *this;
        }

        QMapIterator<K,T> operator--(int) {
    	QMapIterator<K,T> tmp = *this;
    	dec();
    	return tmp;
        }
    };

    template<class K, class T>
    class Q_EXPORT QMapConstIterator
    {
     public:
        /**
         * Typedefs
         */
        typedef QMapNode< K, T >* NodePtr;
    #ifndef QT_NO_STL
        typedef std::bidirectional_iterator_tag  iterator_category;
    #endif
        typedef T          value_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
         */
        QMapNode<K,T>* node;

        /**
         * Functions
         */
        QMapConstIterator() : node( 0 ) {}
        QMapConstIterator( QMapNode<K,T>* p ) : node( p ) {}
        QMapConstIterator( const QMapConstIterator<K,T>& it ) : node( it.node ) {}
        QMapConstIterator( const QMapIterator<K,T>& it ) : node( it.node ) {}

        bool operator==( const QMapConstIterator<K,T>& it ) const { return node == it.node; }
        bool operator!=( const QMapConstIterator<K,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; }

        const K& key() const { return node->key; }
        const T& data() const { return node->data; }

    private:
        int inc() {
    	QMapNodeBase* tmp = node;
    	if ( tmp->right ) {
    	    tmp = tmp->right;
    	    while ( tmp->left )
    		tmp = tmp->left;
    	} else {
    	    QMapNodeBase* y = tmp->parent;
    	    while (tmp == y->right) {
    		tmp = y;
    		y = y->parent;
    	    }
    	    if (tmp->right != y)
    		tmp = y;
    	}
    	node = (NodePtr)tmp;
    	return 0;
        }

        int dec() {
    	QMapNodeBase* tmp = node;
    	if (tmp->color == QMapNodeBase::Red &&
    	    tmp->parent->parent == tmp ) {
    	    tmp = tmp->right;
    	} else if (tmp->left != 0) {
    	    QMapNodeBase* y = tmp->left;
    	    while ( y->right )
    		y = y->right;
    	    tmp = y;
    	} else {
    	    QMapNodeBase* y = tmp->parent;
    	    while (tmp == y->left) {
    		tmp = y;
    		y = y->parent;
    	    }
    	    tmp = y;
    	}
    	node = (NodePtr)tmp;
    	return 0;
        }

    public:
        QMapConstIterator<K,T>& operator++() {
    	inc();
    	return *this;
        }

        QMapConstIterator<K,T> operator++(int) {
    	QMapConstIterator<K,T> tmp = *this;
    	inc();
    	return tmp;
        }

        QMapConstIterator<K,T>& operator--() {
    	dec();
    	return *this;
        }

        QMapConstIterator<K,T> operator--(int) {
    	QMapConstIterator<K,T> tmp = *this;
    	dec();
    	return tmp;
        }
    };

    class Q_EXPORT QMapPrivateBase : public QShared
    {
    public:
        QMapPrivateBase() {
    	node_count = 0;
        }
        QMapPrivateBase( const QMapPrivateBase* _map) {
    	node_count = _map->node_count;
        }

        /**
         * Implementations of basic tree algorithms
         */
        void rotateLeft( QMapNodeBase* x, QMapNodeBase*& root);
        void rotateRight( QMapNodeBase* x, QMapNodeBase*& root );
        void rebalance( QMapNodeBase* x, QMapNodeBase*& root );
        QMapNodeBase* removeAndRebalance( QMapNodeBase* z, QMapNodeBase*& root,
    				      QMapNodeBase*& leftmost,
    				      QMapNodeBase*& rightmost );

        /**
         * Variables
         */
        int node_count;
    };

    template <class Key, class T>
    class QMapPrivate : public QMapPrivateBase
    {
    public:
        /**
         * Typedefs
         */
        typedef QMapIterator< Key, T > Iterator;
        typedef QMapConstIterator< Key, T > ConstIterator;
        typedef QMapNode< Key, T > Node;
        typedef QMapNode< Key, T >* NodePtr;

        /**
         * Functions
         */
        QMapPrivate() {
    	header = new Node;
    	header->color = QMapNodeBase::Red; // Mark the header
    	header->parent = 0;
    	header->left = header->right = header;
        }
        QMapPrivate( const QMapPrivate< Key, T >* _map ) : QMapPrivateBase( _map ) {
    	header = new Node;
    	header->color = QMapNodeBase::Red; // Mark the header
    	if ( _map->header->parent == 0 ) {
    	    header->parent = 0;
    	    header->left = header->right = header;
    	} else {
    	    header->parent = copy( (NodePtr)(_map->header->parent) );
    	    header->parent->parent = header;
    	    header->left = header->parent->minimum();
    	    header->right = header->parent->maximum();
    	}
        }
        ~QMapPrivate() { clear(); delete header; }

        NodePtr copy( NodePtr p ) {
    	if ( !p )
    	    return 0;
    	NodePtr n = new Node( *p );
    	n->color = p->color;
    	if ( p->left ) {
    	    n->left = copy( (NodePtr)(p->left) );
    	    n->left->parent = n;
    	} else {
    	    n->left = 0;
    	}
    	if ( p->right ) {
    	    n->right = copy( (NodePtr)(p->right) );
    	    n->right->parent = n;
    	} else {
    	    n->right = 0;
    	}
    	return n;
        }

        void clear() {
    	clear( (NodePtr)(header->parent) );
    	header->color = QMapNodeBase::Red;
    	header->parent = 0;
    	header->left = header->right = header;
    	node_count = 0;
        }

        void clear( NodePtr p ) {
    	while ( p != 0 ) {
    	    clear( (NodePtr)p->right );
    	    NodePtr y = (NodePtr)p->left;
    	    delete p;
    	    p = y;
    	}
        }

        Iterator begin()	{ return Iterator( (NodePtr)(header->left ) ); }
        Iterator end()	{ return Iterator( header ); }
        ConstIterator begin() const { return ConstIterator( (NodePtr)(header->left ) ); }
        ConstIterator end() const { return ConstIterator( header ); }

        ConstIterator find(const Key& k) const {
    	QMapNodeBase* y = header;        // Last node
    	QMapNodeBase* x = header->parent; // Root node.

    	while ( x != 0 ) {
    	    // If as k <= key(x) go left
    	    if ( !( key(x) < k ) ) {
    		y = x;
    		x = x->left;
    	    } else {
    		x = x->right;
    	    }
    	}

    	// Was k bigger/smaller then the biggest/smallest
    	// element of the tree ? Return end()
    	if ( y == header || k < key(y) )
    	    return ConstIterator( header );
    	return ConstIterator( (NodePtr)y );
        }

        void remove( Iterator it ) {
    	NodePtr del = (NodePtr) removeAndRebalance( it.node, header->parent, header->left, header->right );
    	delete del;
    	--node_count;
        }

    #ifdef QT_QMAP_DEBUG
        void inorder( QMapNodeBase* x = 0, int level = 0 ){
    	if ( !x )
    	    x = header->parent;
    	if ( x->left )
    	    inorder( x->left, level + 1 );
        //cout << level << " Key=" << key(x) << " Value=" << ((NodePtr)x)->data << endl;
    	if ( x->right )
    	    inorder( x->right, level + 1 );
        }
    #endif

    #if 0
        Iterator insertMulti(const Key& v){
    	QMapNodeBase* y = header;
    	QMapNodeBase* x = header->parent;
    	while (x != 0){
    	    y = x;
    	    x = ( v < key(x) ) ? x->left : x->right;
    	}
    	return insert(x, y, v);
        }
    #endif

        Iterator insertSingle( const Key& k ) {
    	// Search correct position in the tree
    	QMapNodeBase* y = header;
    	QMapNodeBase* x = header->parent;
    	bool result = TRUE;
    	while ( x != 0 ) {
    	    result = ( k < key(x) );
    	    y = x;
    	    x = result ? x->left : x->right;
    	}
    	// Get iterator on the last not empty one
    	Iterator j( (NodePtr)y );
    	if ( result ) {
    	    // Smaller then the leftmost one ?
    	    if ( j == begin() ) {
    		return insert(x, y, k );
    	    } else {
    		// Perhaps daddy is the right one ?
    		--j;
    	    }
    	}
    	// Really bigger ?
    	if ( (j.node->key) < k )
    	    return insert(x, y, k );
    	// We are going to replace a node
    	return j;
        }

        Iterator insert( QMapNodeBase* x, QMapNodeBase* y, const Key& k ) {
    	NodePtr z = new Node( k );
    	if (y == header || x != 0 || k < key(y) ) {
    	    y->left = z;                // also makes leftmost = z when y == header
    	    if ( y == header ) {
    		header->parent = z;
    		header->right = z;
    	    } else if ( y == header->left )
    		header->left = z;           // maintain leftmost pointing to min node
    	} else {
    	    y->right = z;
    	    if ( y == header->right )
    		header->right = z;          // maintain rightmost pointing to max node
    	}
    	z->parent = y;
    	z->left = 0;
    	z->right = 0;
    	rebalance( z, header->parent );
    	++node_count;
    	return Iterator(z);
        }

    protected:
        /**
         * Helpers
         */
        const Key& key( QMapNodeBase* b ) const { return ((NodePtr)b)->key; }

        /**
         * Variables
         */
        NodePtr header;
    };

    #ifdef QT_CHECK_RANGE
    # if !defined( QT_NO_DEBUG ) && defined( QT_CHECK_MAP_RANGE )
    #  define QT_CHECK_INVALID_MAP_ELEMENT if ( empty() ) qWarning( "QMap: Warning invalid element" )
    #  define QT_CHECK_INVALID_MAP_ELEMENT_FATAL Q_ASSERT( !empty() );
    # else
    #  define QT_CHECK_INVALID_MAP_ELEMENT
    #  define QT_CHECK_INVALID_MAP_ELEMENT_FATAL
    # endif
    #else
    # define QT_CHECK_INVALID_MAP_ELEMENT
    # define QT_CHECK_INVALID_MAP_ELEMENT_FATAL
    #endif

    template<class Key, class T>
    class Q_EXPORT QMap
    {
    public:
        /**
         * Typedefs
         */
        typedef Key key_type;
        typedef T mapped_type;
        typedef QPair<const key_type, mapped_type> value_type;
        typedef value_type* pointer;
        typedef const value_type* const_pointer;
        typedef value_type& reference;
        typedef const value_type& const_reference;
    #ifndef QT_NO_STL
        typedef ptrdiff_t  difference_type;
    #else
        typedef int difference_type;
    #endif
        typedef size_t      size_type;
        typedef QMapIterator<Key,T> iterator;
        typedef QMapConstIterator<Key,T> const_iterator;

        /**
         * API
         */
        QMap()
        {
    	sh = new QMapPrivate< Key, T >;
        }
        QMap( const QMap<Key,T>& m )
        {
    	sh = m.sh; sh->ref();
        }

    #ifndef QT_NO_STL
        QMap( const Q_TYPENAME std::map<Key,T>& m )
        {
    	sh = new QMapPrivate<Key,T>;
    #if defined(Q_OS_WIN32)
    	std::map<Key,T>::const_iterator it = m.begin();
    #else
    	QMapConstIterator<Key,T> it = m.begin();
    #endif
    	for ( ; it != m.end(); ++it ) {
    	    value_type p( (*it).first, (*it).second );
    	    insert( p );
    	}
        }
    #endif
        ~QMap()
        {
    	if ( sh->deref() )
    	    delete sh;
        }
        QMap<Key,T>& operator= ( const QMap<Key,T>& m )
        {
    	m.sh->ref();
    	if ( sh->deref() )
    	    delete sh;
    	sh = m.sh;
    	return *this;
        }
    #ifndef QT_NO_STL
        QMap<Key,T>& operator= ( const Q_TYPENAME std::map<Key,T>& m )
        {
    	clear();
    #if defined(Q_OS_WIN32)
    	std::map<Key,T>::const_iterator it = m.begin();
    #else
    	QMapConstIterator<Key,T> it = m.begin();
    #endif
    	for ( ; it != m.end(); ++it ) {
    	    value_type p( (*it).first, (*it).second );
    	    insert( p );
    	}
    	return *this;
        }
    #endif

        iterator begin()
        {
    	detach();
    	return sh->begin();
        }
        iterator end()
        {
    	detach();
    	return sh->end();
        }
        const_iterator begin() const
        {
    	return ((const Priv*)sh)->begin();
        }
        const_iterator end() const
        {
    	return ((const Priv*)sh)->end();
        }
        iterator replace( const Key& k, const T& v )
        {
    	remove( k );
    	return insert( k, v );
        }

        size_type size() const
        {
    	return sh->node_count;
        }
        bool empty() const
        {
    	return sh->node_count == 0;
        }
        QPair<iterator,bool> insert( const value_type& x )
        {
    	detach();
    	size_type n = size();
    	iterator it = sh->insertSingle( x.first );
    	bool inserted = FALSE;
    	if ( n < size() ) {
    	    inserted = TRUE;
    	    it.data() = x.second;
    	}
    	return QPair<iterator,bool>( it, inserted );
        }
        void erase( iterator it )
        {
    	detach();
    	sh->remove( it );
        }
        void erase( const key_type& k )
        {
    	detach();
    	iterator it( sh->find( k ).node );
    	if ( it != end() )
    	    sh->remove( it );
        }
        size_type count( const key_type& k ) const
        {
    	const_iterator it( sh->find( k ).node );
    	if ( it != end() ) {
    	    size_type c = 0;
    	    while ( it != end() ) {
    		++it;
    		++c;
    	    }
    	    return c;
    	}
    	return 0;
        }

        T& operator[] ( const Key& k )
        {
    	detach();
    	QMapNode<Key,T>* p = sh->find( k ).node;
    	if ( p != sh->end().node )
    	    return p->data;
    	return insert( k, T() ).data();
        }

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

        typedef QMapIterator< Key, T > Iterator;
        typedef QMapConstIterator< Key, T > ConstIterator;
        typedef T ValueType;
        typedef QMapPrivate< Key, T > Priv;

        iterator find ( const Key& k )
        {
    	detach();
    	return iterator( sh->find( k ).node );
        }
        const_iterator find ( const Key& k ) const {	return sh->find( k ); }

        const T& operator[] ( const Key& k ) const
    	{ QT_CHECK_INVALID_MAP_ELEMENT; return sh->find( k ).data(); }
        bool contains ( const Key& k ) const
    	{ return find( k ) != end(); }
    	//{ return sh->find( k ) != ((const Priv*)sh)->end(); }

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

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

        iterator insert( const Key& key, const T& value, bool overwrite = TRUE ) {
    	detach();
    	size_type n = size();
    	iterator it = sh->insertSingle( key );
    	if ( overwrite || n < size() )
    	    it.data() = value;
    	return it;
        }

        void remove( iterator it ) { detach(); sh->remove( it ); }
        void remove( const Key& k ) {
    	detach();
    	iterator it( sh->find( k ).node );
    	if ( it != end() )
    	    sh->remove( it );
        }

    #if defined(Q_FULL_TEMPLATE_INSTANTIATION)
        bool operator==( const QMap<Key,T>& ) const { return FALSE; }
    #ifndef QT_NO_STL
        bool operator==( const Q_TYPENAME std::map<Key,T>& ) const { return FALSE; }
    #endif
    #endif

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

        Priv* sh;
    };

    #ifndef QT_NO_DATASTREAM
    template<class Key, class T>
    inline QDataStream& operator>>( QDataStream& s, QMap<Key,T>& m ) {
        m.clear();
        Q_UINT32 c;
        s >> c;
        for( Q_UINT32 i = 0; i < c; ++i ) {
    	Key k; T t;
    	s >> k >> t;
    	m.insert( k, t );
    	if ( s.atEnd() )
    	    break;
        }
        return s;
    }

    template<class Key, class T>
    inline QDataStream& operator<<( QDataStream& s, const QMap<Key,T>& m ) {
        s << (Q_UINT32)m.size();
        QMapConstIterator<Key,T> it = m.begin();
        for( ; it != m.end(); ++it )
    	s << it.key() << it.data();
        return s;
    }
    #endif

    #endif // QMAP_H