/**************************************************************************** ** ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). ** All rights reserved. ** Contact: Nokia Corporation (qt-info@nokia.com) ** ** This file is part of the documentation of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:FDL$ ** 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 Technology Preview License Agreement accompanying ** this package. ** ** GNU Free Documentation License ** Alternatively, this file may be used under the terms of the GNU Free ** Documentation License version 1.3 as published by the Free Software ** Foundation and appearing in the file included in the packaging of this ** file. ** ** If you have questions regarding the use of this file, please contact ** Nokia at qt-info@nokia.com. ** $QT_END_LICENSE$ ** ****************************************************************************/ /*! \class Q3AsciiDict \brief The Q3AsciiDict class is a template class that provides a dictionary based on char* keys. \compat Q3AsciiDict is implemented as a template class. Define a template instance Q3AsciiDict\ to create a dictionary that operates on pointers to X (X*). A dictionary is a collection of key-value pairs. The key is a char* used for insertion, removal and lookup. The value is a pointer. Dictionaries provide very fast insertion and lookup. Q3AsciiDict cannot handle Unicode keys; use the Q3Dict template instead, which uses QString keys. A Q3Dict has the same performace as a Q3AsciiDict. Example: \snippet doc/src/snippets/code/doc_src_q3asciidict.qdoc 0 In this example we use a dictionary to keep track of the line edits we're using. We insert each line edit into the dictionary with a unique name and then access the line edits via the dictionary. See Q3PtrDict, Q3IntDict and Q3Dict. See Q3Dict for full details, including the choice of dictionary size, and how deletions are handled. \sa Q3AsciiDictIterator, Q3Dict, Q3IntDict, Q3PtrDict */ /*! \fn Q3AsciiDict::Q3AsciiDict( int size, bool caseSensitive, bool copyKeys ) Constructs a dictionary optimized for less than \a size entries. We recommend setting \a size to a suitably large prime number (a bit larger than the expected number of entries). This makes the hash distribution better and will improve lookup performance. When \a caseSensitive is TRUE (the default) Q3AsciiDict treats "abc" and "Abc" as different keys; when it is FALSE "abc" and "Abc" are the same. Case-insensitive comparison only considers the 26 letters in US-ASCII. If \a copyKeys is TRUE (the default), the dictionary copies keys using strcpy(); if it is FALSE, the dictionary just copies the pointers. */ /*! \fn Q3AsciiDict::Q3AsciiDict( const Q3AsciiDict &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 Q3AsciiDict::~Q3AsciiDict() Removes all items from the dictionary and destroys it. The items are deleted if auto-delete is enabled. All iterators that access this dictionary will be reset. \sa setAutoDelete() */ /*! \fn Q3AsciiDict &Q3AsciiDict::operator=(const Q3AsciiDict &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 this dictionary. Only the pointers are copied (shallow copy) unless newItem() has been reimplemented(). */ /*! \fn uint Q3AsciiDict::count() const Returns the number of items in the dictionary. \sa isEmpty() */ /*! \fn uint Q3AsciiDict::size() const Returns the size of the internal hash array (as specified in the constructor). \sa count() */ /*! \fn void Q3AsciiDict::resize( uint newsize ) Changes the size of the hashtable to \a newsize. The contents of the dictionary are preserved but all iterators on the dictionary become invalid. */ /*! \fn bool Q3AsciiDict::isEmpty() const Returns TRUE if the dictionary is empty, i.e. count() == 0; otherwise it returns FALSE. \sa count() */ /*! \fn void Q3AsciiDict::insert( const char *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 Q3AsciiDict::replace( const char *key, const type *item ) Replaces an item that has a key equal to \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_q3asciidict.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 Q3AsciiDict::remove( const char *key ) Removes the item associated with \a key from the dictionary. Returns TRUE if successful, i.e. if the key existed 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 *Q3AsciiDict::take( const char *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 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 Q3AsciiDict::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 dictionary are reset. \sa remove(), take(), setAutoDelete() */ /*! \fn type *Q3AsciiDict::find( const char *key ) const Returns the item associated with \a key, or 0 if the key does not exist in the dictionary. This function uses an internal hashing algorithm to optimize lookup. If there are two or more items with equal keys, then the item that was most recently inserted will be found. Equivalent to the [] operator. \sa operator[]() */ /*! \fn type *Q3AsciiDict::operator[]( const char *key ) const Returns the item associated with \a key, or 0 if the key does not exist in the dictionary. This function uses an internal hashing algorithm to optimize lookup. If there are two or more items with equal keys, then the item that was most recently inserted will be found. Equivalent to the find() function. \sa find() */ /*! \fn void Q3AsciiDict::statistics() const Debugging-only function that prints out the dictionary distribution using qDebug(). */ /*! \fn QDataStream& Q3AsciiDict::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& Q3AsciiDict::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 Q3AsciiDictIterator \brief The Q3AsciiDictIterator class provides an iterator for Q3AsciiDict collections. \compat Q3AsciiDictIterator is implemented as a template class. Define a template instance Q3AsciiDictIterator\ to create a dictionary iterator that operates on Q3AsciiDict\ (dictionary of X*). Example: \snippet doc/src/snippets/code/doc_src_q3asciidict.qdoc 2 In the example we insert some line edits into a dictionary, then iterate over the dictionary printing the strings associated with those line edits. Note that the traversal order is arbitrary; you are not guaranteed any particular order. Multiple iterators may independently traverse the same dictionary. A Q3AsciiDict knows about all the iterators that are operating on the dictionary. When an item is removed from the dictionary, Q3AsciiDict updates all the iterators that are referring to the removed item to point to the next item in the (arbitrary) traversal order. \sa Q3AsciiDict */ /*! \fn Q3AsciiDictIterator::Q3AsciiDictIterator( const Q3AsciiDict &dict ) Constructs an iterator for \a dict. The current iterator item is set to point on the first item in the \a dict. */ /*! \fn Q3AsciiDictIterator::~Q3AsciiDictIterator() Destroys the iterator. */ /*! \fn uint Q3AsciiDictIterator::count() const Returns the number of items in the dictionary this iterator operates over. \sa isEmpty() */ /*! \fn bool Q3AsciiDictIterator::isEmpty() const Returns TRUE if the dictionary is empty, i.e. count() == 0, otherwise returns FALSE. \sa count() */ /*! \fn type *Q3AsciiDictIterator::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 Q3AsciiDictIterator::operator type *() const Cast operator. Returns a pointer to the current iterator item. Same as current(). */ /*! \fn type *Q3AsciiDictIterator::current() const Returns a pointer to the current iterator item. */ /*! \fn const char *Q3AsciiDictIterator::currentKey() const Returns a pointer to the key for the current iterator item. */ /*! \fn type *Q3AsciiDictIterator::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 *Q3AsciiDictIterator::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 *Q3AsciiDictIterator::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. */