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-/****************************************************************************
-**
-** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
-** Contact: Nokia Corporation (qt-info@nokia.com)
-**
-** This file is part of the documentation of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** No Commercial Usage
-** This file contains pre-release code and may not be distributed.
-** You may use this file in accordance with the terms and conditions
-** contained in the either Technology Preview License Agreement or the
-** Beta Release License Agreement.
-**
-** GNU Lesser General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU Lesser
-** General Public License version 2.1 as published by the Free Software
-** Foundation and appearing in the file LICENSE.LGPL included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU Lesser General Public License version 2.1 requirements
-** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
-**
-** In addition, as a special exception, Nokia gives you certain
-** additional rights. These rights are described in the Nokia Qt LGPL
-** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
-** package.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 3.0 as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU General Public License version 3.0 requirements will be
-** met: http://www.gnu.org/copyleft/gpl.html.
-**
-** If you are unsure which license is appropriate for your use, please
-** contact the sales department at http://qt.nokia.com/contact.
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-/*!
- \class Q3Dict
- \brief The Q3Dict class is a template class that provides a
- dictionary based on QString keys.
- \compat
-
- Q3Dict is implemented as a template class. Define a template
- instance Q3Dict\<X\> to create a dictionary that operates on
- pointers to X (X *).
-
- A dictionary is a collection of key-value pairs. The key is a
- QString used for insertion, removal and lookup. The value is a
- pointer. Dictionaries provide very fast insertion and lookup.
-
- If you want to use non-Unicode, plain 8-bit \c char* keys, use the
- Q3AsciiDict template. A Q3Dict has the same performance as a
- Q3AsciiDict. If you want to have a dictionary that maps QStrings to
- QStrings use QMap.
-
- The size() of the dictionary is very important. In order to get
- good performance, you should use a suitably large prime number.
- Suitable means equal to or larger than the maximum expected number
- of dictionary items. Size is set in the constructor but may be
- changed with resize().
-
- Items are inserted with insert(); 0 pointers cannot be inserted.
- Items are removed with remove(). All the items in a dictionary can
- be removed with clear(). The number of items in the dictionary is
- returned by count(). If the dictionary contains no items isEmpty()
- returns TRUE. You can change an item's value with replace(). Items
- are looked up with operator[](), or with find() which return a
- pointer to the value or 0 if the given key does not exist. You can
- take an item out of the dictionary with take().
-
- Calling setAutoDelete(TRUE) for a dictionary tells it to delete
- items that are removed. The default behavior is not to delete
- items when they are removed.
-
- When an item is inserted, the key is converted (hashed) to an
- integer index into an internal hash array. This makes lookup very
- fast.
-
- Items with equal keys are allowed. When inserting two items with
- the same key, only the last inserted item will be accessible (last
- in, first out) until it is removed.
-
- The Q3DictIterator class can traverse the dictionary, but only in
- an arbitrary order. Multiple iterators may independently traverse
- the same dictionary.
-
- When inserting an item into a dictionary, only the pointer is
- copied, not the item itself, i.e. a shallow copy is made. It is
- possible to make the dictionary copy all of the item's data (a
- deep copy) when an item is inserted. insert() calls the virtual
- function Q3PtrCollection::newItem() for the item to be inserted.
- Inherit a dictionary and reimplement newItem() if you want deep
- copies.
-
- When removing a dictionary item, the virtual function
- Q3PtrCollection::deleteItem() is called. Q3Dict's default
- implementation is to delete the item if auto-deletion is enabled.
-
- \sa Q3DictIterator, Q3AsciiDict, Q3IntDict, Q3PtrDict
-*/
-
-
-/*!
- \fn Q3Dict::Q3Dict( int size, bool caseSensitive )
-
- Constructs a dictionary optimized for less than \a size entries.
-
- We recommend setting \a size to a suitably large prime number
- (e.g. a prime that's slightly larger than the expected number of
- entries). This makes the hash distribution better which will lead
- to faster lookup.
-
- If \a caseSensitive is TRUE (the default), keys which differ only
- by case are considered different.
-*/
-
-/*!
- \fn Q3Dict::Q3Dict( const Q3Dict<type> &dict )
-
- Constructs a copy of \a dict.
-
- Each item in \a dict is inserted into this dictionary. Only the
- pointers are copied (shallow copy).
-*/
-
-/*!
- \fn Q3Dict::~Q3Dict()
-
- Removes all items from the dictionary and destroys it. If
- setAutoDelete() is TRUE, each value is deleted. All iterators that
- access this dictionary will be reset.
-
- \sa setAutoDelete()
-*/
-
-/*!
- \fn Q3Dict<type> &Q3Dict::operator=(const Q3Dict<type> &dict)
-
- Assigns \a dict to this dictionary and returns a reference to this
- dictionary.
-
- This dictionary is first cleared, then each item in \a dict is
- inserted into this dictionary. Only the pointers are copied
- (shallow copy), unless newItem() has been reimplemented.
-*/
-
-/*!
- \fn uint Q3Dict::count() const
-
- Returns the number of items in the dictionary.
-
- \sa isEmpty()
-*/
-
-/*!
- \fn uint Q3Dict::size() const
-
- Returns the size of the internal hash array (as specified in the
- constructor).
-
- \sa count()
-*/
-
-/*!
- \fn void Q3Dict::resize( uint newsize )
-
- Changes the size of the hash table to \a newsize. The contents of
- the dictionary are preserved, but all iterators on the dictionary
- become invalid.
-*/
-
-/*!
- \fn bool Q3Dict::isEmpty() const
-
- Returns TRUE if the dictionary is empty, i.e. count() == 0;
- otherwise returns FALSE.
-
- \sa count()
-*/
-
-/*!
- \fn void Q3Dict::insert( const QString &key, const type *item )
-
- Inserts the key \a key with value \a item into the dictionary.
-
- Multiple items can have the same key, in which case only the last
- item will be accessible using \l operator[]().
-
- \a item may not be 0.
-
- \sa replace()
-*/
-
-/*!
- \fn void Q3Dict::replace( const QString &key, const type *item )
-
- Replaces the value of the key, \a key with \a item.
-
- If the item does not already exist, it will be inserted.
-
- \a item may not be 0.
-
- Equivalent to:
- \snippet doc/src/snippets/code/doc_src_q3dict.qdoc 0
-
- If there are two or more items with equal keys, then the last item
- that was inserted will be replaced.
-
- \sa insert()
-*/
-
-/*!
- \fn bool Q3Dict::remove( const QString &key )
-
- Removes the item with \a key from the dictionary. Returns TRUE if
- successful, i.e. if the item is in the dictionary; otherwise
- returns FALSE.
-
- If there are two or more items with equal keys, then the last item
- that was inserted will be removed.
-
- The removed item is deleted if \link
- Q3PtrCollection::setAutoDelete() auto-deletion\endlink is enabled.
-
- All dictionary iterators that refer to the removed item will be
- set to point to the next item in the dictionary's traversal order.
-
- \sa take(), clear(), setAutoDelete()
-*/
-
-/*!
- \fn type *Q3Dict::take( const QString &key )
-
- Takes the item with \a key out of the dictionary without deleting
- it (even if \link Q3PtrCollection::setAutoDelete()
- auto-deletion\endlink is enabled).
-
- If there are two or more items with equal keys, then the last item
- that was inserted will be taken.
-
- Returns a pointer to the item taken out, or 0 if the key does not
- exist in the dictionary.
-
- All dictionary iterators that refer to the taken item will be set
- to point to the next item in the dictionary traversal order.
-
- \sa remove(), clear(), setAutoDelete()
-*/
-
-/*!
- \fn void Q3Dict::clear()
-
- Removes all items from the dictionary.
-
- The removed items are deleted if \link
- Q3PtrCollection::setAutoDelete() auto-deletion\endlink is enabled.
-
- All dictionary iterators that operate on the dictionary are reset.
-
- \sa remove(), take(), setAutoDelete()
-*/
-
-/*!
- \fn type *Q3Dict::find( const QString &key ) const
-
- Returns the item with key \a key, or 0 if the key does not exist
- in the dictionary.
-
- If there are two or more items with equal keys, then the most
- recently inserted item will be found.
-
- Equivalent to the [] operator.
-
- \sa operator[]()
-*/
-
-/*!
- \fn type *Q3Dict::operator[]( const QString &key ) const
-
- Returns the item with key \a key, or 0 if the key does not
- exist in the dictionary.
-
- If there are two or more items with equal keys, then the most
- recently inserted item will be found.
-
- Equivalent to the find() function.
-
- \sa find()
-*/
-
-/*!
- \fn void Q3Dict::statistics() const
-
- Debugging-only function that prints out the dictionary
- distribution using qDebug().
-*/
-
-/*!
- \fn QDataStream& Q3Dict::read( QDataStream &s, Q3PtrCollection::Item &item )
-
- Reads a dictionary item from the stream \a s and returns a
- reference to the stream.
-
- The default implementation sets \a item to 0.
-
- \sa write()
-*/
-
-/*!
- \fn QDataStream& Q3Dict::write( QDataStream &s, Q3PtrCollection::Item item ) const
-
- Writes a dictionary \a item to the stream \a s and returns a
- reference to the stream.
-
- \sa read()
-*/
-
-/*!
- \class Q3DictIterator
- \brief The Q3DictIterator class provides an iterator for Q3Dict collections.
- \compat
-
- Q3DictIterator is implemented as a template class. Define a
- template instance Q3DictIterator\<X\> to create a dictionary
- iterator that operates on Q3Dict\<X\> (dictionary of X*).
-
- The traversal order is arbitrary; when we speak of the "first",
- "last" and "next" item we are talking in terms of this arbitrary
- order.
-
- Multiple iterators may independently traverse the same dictionary.
- A Q3Dict knows about all the iterators that are operating on the
- dictionary. When an item is removed from the dictionary, Q3Dict
- updates all iterators that are referring to the removed item to
- point to the next item in the (arbitrary) traversal order.
-
- Example:
- \snippet doc/src/snippets/code/doc_src_q3dict.qdoc 1
- In the example we insert some pointers to line edits into a
- dictionary, then iterate over the dictionary printing the strings
- associated with the line edits.
-
- \sa Q3Dict
-*/
-
-/*!
- \fn Q3DictIterator::Q3DictIterator( const Q3Dict<type> &dict )
-
- Constructs an iterator for \a dict. The current iterator item is
- set to point to the first item in the dictionary, \a dict. First
- in this context means first in the arbitrary traversal order.
-*/
-
-/*!
- \fn Q3DictIterator::~Q3DictIterator()
-
- Destroys the iterator.
-*/
-
-/*!
- \fn uint Q3DictIterator::count() const
-
- Returns the number of items in the dictionary over which the
- iterator is operating.
-
- \sa isEmpty()
-*/
-
-/*!
- \fn bool Q3DictIterator::isEmpty() const
-
- Returns TRUE if the dictionary is empty, i.e. count() == 0;
- otherwise returns FALSE.
-
- \sa count()
-*/
-
-/*!
- \fn type *Q3DictIterator::toFirst()
-
- Resets the iterator, making the first item the first current item.
- First in this context means first in the arbitrary traversal
- order. Returns a pointer to this item.
-
- If the dictionary is empty it sets the current item to 0 and
- returns 0.
-*/
-
-/*!
- \fn type *Q3DictIterator::operator*()
- \internal
-*/
-
-/*!
- \fn Q3DictIterator::operator type*() const
-
- Cast operator. Returns a pointer to the current iterator item.
- Same as current().
-*/
-
-
-/*!
- \fn type *Q3DictIterator::current() const
-
- Returns a pointer to the current iterator item's value.
-*/
-
-/*!
- \fn QString Q3DictIterator::currentKey() const
-
- Returns the current iterator item's key.
-*/
-
-/*!
- \fn type *Q3DictIterator::operator()()
-
- Makes the next item current and returns the original current item.
-
- If the current iterator item was the last item in the dictionary
- or if it was 0, 0 is returned.
-*/
-
-/*!
- \fn type *Q3DictIterator::operator++()
-
- Prefix ++ makes the next item current and returns the new current
- item.
-
- If the current iterator item was the last item in the dictionary
- or if it was 0, 0 is returned.
-*/
-
-/*!
- \fn type *Q3DictIterator::operator+=( uint jump )
- \internal
- Sets the current item to the item \a jump positions after the current item,
- and returns a pointer to that item.
-
- If that item is beyond the last item or if the dictionary is empty,
- it sets the current item to 0 and returns 0.
-*/