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diff --git a/doc/src/classes/q3ptrdict.qdoc b/doc/src/classes/q3ptrdict.qdoc new file mode 100644 index 000000000..38ca0bb78 --- /dev/null +++ b/doc/src/classes/q3ptrdict.qdoc @@ -0,0 +1,388 @@ +/**************************************************************************** +** +** 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://www.qtsoftware.com/contact. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +/*! + \class Q3PtrDict + \brief The Q3PtrDict class is a template class that provides a dictionary based on void* keys. + \compat + + Q3PtrDict is implemented as a template class. Define a template + instance Q3PtrDict\<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 + void* used for insertion, removal and lookup. The value is a + pointer. Dictionaries provide very fast insertion and lookup. + + Example: + \snippet doc/src/snippets/code/doc_src_q3ptrdict.qdoc 0 + In this example we use a dictionary to add an extra property (a + char*) to the line edits we're using. + + See Q3Dict for full details, including the choice of dictionary + size, and how deletions are handled. + + \sa Q3PtrDictIterator, Q3Dict, Q3AsciiDict, Q3IntDict +*/ + + +/*! + \fn Q3PtrDict::Q3PtrDict( int size ) + + Constructs a dictionary using an internal hash array with the size + \a size. + + Setting \a size to a suitably large prime number (equal to or + greater than the expected number of entries) makes the hash + distribution better and improves lookup performance. +*/ + +/*! + \fn Q3PtrDict::Q3PtrDict( const Q3PtrDict<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 Q3PtrDict::~Q3PtrDict() + + Removes all items from the dictionary and destroys it. + + All iterators that access this dictionary will be reset. + + \sa setAutoDelete() +*/ + +/*! + \fn Q3PtrDict<type> &Q3PtrDict::operator=(const Q3PtrDict<type> &dict) + + Assigns \a dict to this dictionary and returns a reference to this + dictionary. + + This dictionary is first cleared and then each item in \a dict is + inserted into the dictionary. Only the pointers are copied + (shallow copy), unless newItem() has been reimplemented. +*/ + +/*! + \fn uint Q3PtrDict::count() const + + Returns the number of items in the dictionary. + + \sa isEmpty() +*/ + +/*! + \fn uint Q3PtrDict::size() const + + Returns the size of the internal hash table (as specified in the + constructor). + + \sa count() +*/ + +/*! + \fn void Q3PtrDict::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 Q3PtrDict::isEmpty() const + + Returns TRUE if the dictionary is empty; otherwise returns FALSE. + + \sa count() +*/ + +/*! + \fn void Q3PtrDict::insert( void *key, const type *item ) + + Inserts the \a key with the \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 Q3PtrDict::replace( void *key, const type *item ) + + If the dictionary has key \a key, this key's item is replaced with + \a item. If the dictionary doesn't contain key \a key, \a item is + inserted into the dictionary using key \a key. + + \a item may not be 0. + + Equivalent to + \snippet doc/src/snippets/code/doc_src_q3ptrdict.qdoc 1 + + If there are two or more items with equal keys, then the most + recently inserted item will be replaced. + + \sa insert() +*/ + +/*! + \fn bool Q3PtrDict::remove( void *key ) + + Removes the item associated with \a key from the dictionary. + Returns TRUE if successful, i.e. if \a key is in the dictionary; + otherwise returns FALSE. + + If there are two or more items with equal keys, then the most + recently inserted item 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 traversal order. + + \sa take(), clear(), setAutoDelete() +*/ + +/*! + \fn type *Q3PtrDict::take( void *key ) + + Takes the item associated 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 most + recently inserted item will be removed. + + 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 Q3PtrDict::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 access this dictionary will be + reset. + + \sa remove(), take(), setAutoDelete() +*/ + +/*! + \fn type *Q3PtrDict::find( void *key ) const + + Returns the item associated with \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 operator[]. + + \sa operator[]() +*/ + +/*! + \fn type *Q3PtrDict::operator[]( void *key ) const + + Returns the item associated with \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 Q3PtrDict::statistics() const + + Debugging-only function that prints out the dictionary + distribution using qDebug(). +*/ + +/*! + \fn QDataStream& Q3PtrDict::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& Q3PtrDict::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 Q3PtrDictIterator + \brief The Q3PtrDictIterator class provides an iterator for Q3PtrDict collections. + \compat + + Q3PtrDictIterator is implemented as a template class. Define a + template instance Q3PtrDictIterator\<X\> to create a dictionary + iterator that operates on Q3PtrDict\<X\> (dictionary of X*). + + Example: + \snippet doc/src/snippets/code/doc_src_q3ptrdict.qdoc 2 + In the example we insert some line edits into a dictionary, + associating a string with each. We then iterate over the + dictionary printing the associated strings. + + Multiple iterators may independently traverse the same dictionary. + A Q3PtrDict knows about all the iterators that are operating on the + dictionary. When an item is removed from the dictionary, Q3PtrDict + updates all iterators that refer the removed item to point to the + next item in the traversing order. + + \sa Q3PtrDict +*/ + +/*! + \fn Q3PtrDictIterator::Q3PtrDictIterator( const Q3PtrDict<type> &dict ) + + Constructs an iterator for \a dict. The current iterator item is + set to point on the first item in the \a dict. +*/ + +/*! + \fn Q3PtrDictIterator::~Q3PtrDictIterator() + + Destroys the iterator. +*/ + +/*! + \fn uint Q3PtrDictIterator::count() const + + Returns the number of items in the dictionary this iterator + operates on. + + \sa isEmpty() +*/ + +/*! + \fn bool Q3PtrDictIterator::isEmpty() const + + Returns TRUE if the dictionary is empty; otherwise returns FALSE. + + \sa count() +*/ + +/*! + \fn type *Q3PtrDictIterator::toFirst() + + Sets the current iterator item to point to the first item in the + dictionary and returns a pointer to the item. If the dictionary is + empty, it sets the current item to 0 and returns 0. +*/ + +/*! + \fn Q3PtrDictIterator::operator type *() const + + Cast operator. Returns a pointer to the current iterator item. + Same as current(). +*/ + +/*! + \fn type *Q3PtrDictIterator::current() const + + Returns a pointer to the current iterator item's value. +*/ + +/*! + \fn void *Q3PtrDictIterator::currentKey() const + + Returns the current iterator item's key. +*/ + +/*! + \fn type *Q3PtrDictIterator::operator()() + + Makes the succeeding 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 *Q3PtrDictIterator::operator++() + + Prefix ++ makes the succeeding 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 *Q3PtrDictIterator::operator+=( uint jump ) + + 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. +*/ |