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diff --git a/doc/qptrlist.doc b/doc/qptrlist.doc new file mode 100644 index 000000000..ef5427d18 --- /dev/null +++ b/doc/qptrlist.doc @@ -0,0 +1,1259 @@ +/**************************************************************************** +** +** QPtrList and QPtrListIterator class documentation +** +** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved. +** +** This file is part of the Qt GUI Toolkit. +** +** This file may be used under the terms of the GNU General +** Public License versions 2.0 or 3.0 as published by the Free +** Software Foundation and appearing in the files LICENSE.GPL2 +** and LICENSE.GPL3 included in the packaging of this file. +** Alternatively you may (at your option) use any later version +** of the GNU General Public License if such license has been +** publicly approved by Trolltech ASA (or its successors, if any) +** and the KDE Free Qt Foundation. +** +** Please review the following information to ensure GNU General +** Public Licensing retquirements will be met: +** http://trolltech.com/products/qt/licenses/licensing/opensource/. +** If you are unsure which license is appropriate for your use, please +** review the following information: +** http://trolltech.com/products/qt/licenses/licensing/licensingoverview +** or contact the sales department at sales@trolltech.com. +** +** This file may be used under the terms of the Q Public License as +** defined by Trolltech ASA and appearing in the file LICENSE.QPL +** included in the packaging of this file. Licensees holding valid Qt +** Commercial 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 WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR +** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted +** herein. +** +**********************************************************************/ + + +/***************************************************************************** + QPtrList documentation + *****************************************************************************/ + +/*! + \class QPtrList + \brief The QPtrList class is a template class that provides a list. + + \ingroup collection + \ingroup tools + + \important autoDelete setAutoDelete + + QValueList is an STL-compatible alternative to this class. + + Define a template instance QPtrList\<X\> to create a list that + operates on pointers to X (X*). + + The list class is indexable and has a \link at() current + index\endlink and a \link current() current item\endlink. The + first item corresponds to index position 0. The current index is + -1 if the current item is 0. + + Items are inserted with prepend(), insert() or append(). Items are + removed with remove(), removeRef(), removeFirst() and + removeLast(). You can search for an item using find(), findNext(), + findRef() or findNextRef(). The list can be sorted with sort(). + You can count the number of occurrences of an item with contains() + or containsRef(). You can get a pointer to the current item with + current(), to an item at a particular index position in the list + with at() or to the first or last item with getFirst() and + getLast(). You can also iterate over the list with first(), + last(), next() and prev() (which all update current()). The list's + deletion property is set with setAutoDelete(). + + \target example + Example: + \code + class Employee + { + public: + Employee() : sn( 0 ) { } + Employee( const QString& forename, const QString& surname, int salary ) + : fn( forename ), sn( surname ), sal( salary ) + { } + + void setSalary( int salary ) { sal = salary; } + + QString forename() const { return fn; } + QString surname() const { return sn; } + int salary() const { return sal; } + + private: + QString fn; + QString sn; + int sal; + }; + + QPtrList<Employee> list; + list.setAutoDelete( TRUE ); // the list owns the objects + + list.append( new Employee("John", "Doe", 50000) ); + list.append( new Employee("Jane", "Williams", 80000) ); + list.append( new Employee("Tom", "Jones", 60000) ); + + Employee *employee; + for ( employee = list.first(); employee; employee = list.next() ) + cout << employee->surname().latin1() << ", " << + employee->forename().latin1() << " earns " << + employee->salary() << endl; + cout << endl; + + // very inefficient for big lists + for ( uint i = 0; i < list.count(); ++i ) + if ( list.at(i) ) + cout << list.at( i )->surname().latin1() << endl; + \endcode + + The output is + \code + Doe, John earns 50000 + Williams, Jane earns 80000 + Jones, Tom earns 60000 + + Doe + Williams + Jones + \endcode + + QPtrList has several member functions for traversing the list, but + using a QPtrListIterator can be more practical. Multiple list + iterators may traverse the same list, independently of each other + and of the current list item. + + In the example above we make the call setAutoDelete(TRUE). + Enabling auto-deletion tells the list to delete items that are + removed. The default is to not delete items when they are removed + but this would cause a memory leak in the example because there + are no other references to the list items. + + When inserting an item into a list only the pointer is copied, not + the item itself, i.e. a shallow copy. It is possible to make the + list copy all of the item's data (deep copy) when an item is + inserted. insert(), inSort() and append() call the virtual + function QPtrCollection::newItem() for the item to be inserted. + Inherit a list and reimplement newItem() to have deep copies. + + When removing an item from a list, the virtual function + QPtrCollection::deleteItem() is called. QPtrList's default + implementation is to delete the item if auto-deletion is enabled. + + The virtual function compareItems() can be reimplemented to + compare two list items. This function is called from all list + functions that need to compare list items, for instance + remove(const type*). If you only want to deal with pointers, there + are functions that compare pointers instead, for instance + removeRef(const type*). These functions are somewhat faster than + those that call compareItems(). + + List items are stored as \c void* in an internal QLNode, which + also holds pointers to the next and previous list items. The + functions currentNode(), removeNode(), and takeNode() operate + directly on the QLNode, but they should be used with care. The + data component of the node is available through QLNode::getData(). + + The QStrList class defined in \l qstrlist.h is a list of \c char*. + It reimplements newItem(), deleteItem() and compareItems(). (But + see QStringList for a list of Unicode QStrings.) + + \sa QPtrListIterator +*/ + + +/*! + \fn QPtrList::QPtrList() + + Constructs an empty list. +*/ + +/*! + \fn QPtrList::QPtrList( const QPtrList<type> &list ) + + Constructs a copy of \a list. + + Each item in \a list is \link append() appended\endlink to this + list. Only the pointers are copied (shallow copy). +*/ + +/*! + \fn QPtrList::~QPtrList() + + Removes all items from the list and destroys the list. + + All list iterators that access this list will be reset. + + \sa setAutoDelete() +*/ + +/*! + \fn QPtrList<type> &QPtrList::operator=(const QPtrList<type> &list) + + Assigns \a list to this list and returns a reference to this list. + + This list is first cleared and then each item in \a list is \link + append() appended\endlink to this list. Only the pointers are + copied (shallow copy) unless newItem() has been reimplemented. +*/ + +/*! + \fn bool QPtrList::operator==(const QPtrList<type> &list ) const + + Compares this list with \a list. Returns TRUE if the lists contain + the same data; otherwise returns FALSE. +*/ + +/*! + \fn uint QPtrList::count() const + + Returns the number of items in the list. + + \sa isEmpty() +*/ + +/*! + \fn bool QPtrList::operator!=(const QPtrList<type> &list ) const + + Compares this list with \a list. Returns TRUE if the lists contain + different data; otherwise returns FALSE. +*/ + + +/*! + \fn void QPtrList::sort() + + Sorts the list by the result of the virtual compareItems() + function. + + The heap sort algorithm is used for sorting. It sorts n items with + O(n*log n) comparisons. This is the asymptotic optimal solution of + the sorting problem. + + If the items in your list support operator<() and operator==(), + you might be better off with QSortedList because it implements the + compareItems() function for you using these two operators. + + \sa inSort() +*/ + +/*! + \fn bool QPtrList::isEmpty() const + + Returns TRUE if the list is empty; otherwise returns FALSE. + + \sa count() +*/ + +/*! + \fn bool QPtrList::insert( uint index, const type *item ) + + Inserts the \a item at position \a index in the list. + + Returns TRUE if successful, i.e. if \a index is in range; + otherwise returns FALSE. The valid range is 0 to count() + (inclusively). The item is appended if \a index == count(). + + The inserted item becomes the current list item. + + \a item must not be 0. + + \sa append(), current(), replace() +*/ + +/*! + \fn bool QPtrList::replace( uint index, const type *item ) + + Replaces the item at position \a index with the new \a item. + + Returns TRUE if successful, i.e. \a index is in the range 0 to + count()-1. + + \sa append(), current(), insert() +*/ + +/*! + \fn void QPtrList::inSort( const type *item ) + + Inserts the \a item at its sorted position in the list. + + The sort order depends on the virtual compareItems() function. All + items must be inserted with inSort() to maintain the sorting + order. + + The inserted item becomes the current list item. + + \a item must not be 0. + + \warning Using inSort() is slow. An alternative, especially if you + have lots of items, is to simply append() or insert() them and + then use sort(). inSort() takes up to O(n) compares. That means + inserting n items in your list will need O(n^2) compares whereas + sort() only needs O(n*log n) for the same task. So use inSort() + only if you already have a presorted list and want to insert just + a few additional items. + + \sa insert(), compareItems(), current(), sort() +*/ + +/*! + \fn void QPtrList::append( const type *item ) + + Inserts the \a item at the end of the list. + + The inserted item becomes the current list item. This is + equivalent to \c{insert( count(), item )}. + + \a item must not be 0. + + \sa insert(), current(), prepend() +*/ + +/*! + \fn void QPtrList::prepend( const type *item ) + + Inserts the \a item at the start of the list. + + The inserted item becomes the current list item. This is + equivalent to \c{insert( 0, item )}. + + \a item must not be 0. + + \sa append(), insert(), current() +*/ + +/*! + \fn bool QPtrList::remove( uint index ) + + Removes the item at position \a index in the list. + + Returns TRUE if successful, i.e. if \a index is in range; + otherwise returns FALSE. The valid range is \c{0..(count() - 1)} + inclusive. + + The removed item is deleted if \link setAutoDelete() + auto-deletion\endlink is enabled. + + The item after the removed item becomes the new current list item + if the removed item is not the last item in the list. If the last + item is removed, the new last item becomes the current item. + + All list iterators that refer to the removed item will be set to + point to the new current item. + + \sa take(), clear(), setAutoDelete(), current() removeRef() +*/ + +/*! + \fn bool QPtrList::remove() + + \overload + + Removes the current list item. + + Returns TRUE if successful, i.e. if the current item isn't 0; + otherwise returns FALSE. + + The removed item is deleted if \link setAutoDelete() + auto-deletion\endlink is enabled. + + The item after the removed item becomes the new current list item + if the removed item is not the last item in the list. If the last + item is removed, the new last item becomes the current item. The + current item is set to 0 if the list becomes empty. + + All list iterators that refer to the removed item will be set to + point to the new current item. + + \sa take(), clear(), setAutoDelete(), current() removeRef() +*/ + +/*! + \fn bool QPtrList::remove( const type *item ) + + \overload + + Removes the first occurrence of \a item from the list. + + Returns TRUE if successful, i.e. if \a item is in the list; + otherwise returns FALSE. + + The removed item is deleted if \link setAutoDelete() + auto-deletion\endlink is enabled. + + The compareItems() function is called when searching for the item + in the list. If compareItems() is not reimplemented, it is more + efficient to call removeRef(). + + If \a item is NULL then the current item is removed from the list. + + The item after the removed item becomes the new current list item + if the removed item is not the last item in the list. If the last + item is removed, the new last item becomes the current item. The + current item is set to 0 if the list becomes empty. + + All list iterators that refer to the removed item will be set to + point to the new current item. + + \sa removeRef(), take(), clear(), setAutoDelete(), compareItems(), + current() +*/ + +/*! + \fn bool QPtrList::removeRef( const type *item ) + + Removes the first occurrence of \a item from the list. + + Returns TRUE if successful, i.e. if \a item is in the list; + otherwise returns FALSE. + + The removed item is deleted if \link setAutoDelete() + auto-deletion\endlink is enabled. + + Equivalent to: + \code + if ( list.findRef( item ) != -1 ) + list.remove(); + \endcode + + The item after the removed item becomes the new current list item + if the removed item is not the last item in the list. If the last + item is removed, the new last item becomes the current item. The + current item is set to 0 if the list becomes empty. + + All list iterators that refer to the removed item will be set to + point to the new current item. + + \sa remove(), clear(), setAutoDelete(), current() +*/ + +/*! + \fn void QPtrList::removeNode( QLNode *node ) + + Removes the \a node from the list. + + This node must exist in the list, otherwise the program may crash. + + The removed item is deleted if \link setAutoDelete() + auto-deletion\endlink is enabled. + + The first item in the list will become the new current list item. + The current item is set to 0 if the list becomes empty. + + All list iterators that refer to the removed item will be set to + point to the item succeeding this item or to the preceding item if + the removed item was the last item. + + \warning Do not call this function unless you are an expert. + + \sa takeNode(), currentNode() remove() removeRef() +*/ + +/*! + \fn bool QPtrList::removeFirst() + + Removes the first item from the list. Returns TRUE if successful, + i.e. if the list isn't empty; otherwise returns FALSE. + + The removed item is deleted if \link setAutoDelete() + auto-deletion\endlink is enabled. + + The first item in the list becomes the new current list item. The + current item is set to 0 if the list becomes empty. + + All list iterators that refer to the removed item will be set to + point to the new current item. + + \sa removeLast(), setAutoDelete(), current() remove() +*/ + +/*! + \fn bool QPtrList::removeLast() + + Removes the last item from the list. Returns TRUE if successful, + i.e. if the list isn't empty; otherwise returns FALSE. + + The removed item is deleted if \link setAutoDelete() + auto-deletion\endlink is enabled. + + The last item in the list becomes the new current list item. The + current item is set to 0 if the list becomes empty. + + All list iterators that refer to the removed item will be set to + point to the new current item. + + \sa removeFirst(), setAutoDelete(), current() +*/ + +/*! + \fn type *QPtrList::take( uint index ) + + Takes the item at position \a index out of the list without + deleting it (even if \link setAutoDelete() auto-deletion\endlink + is enabled). + + Returns a pointer to the item taken out of the list, or 0 if the + index is out of range. The valid range is \c{0..(count() - 1)} + inclusive. + + The item after the removed item becomes the new current list item + if the removed item is not the last item in the list. If the last + item is removed, the new last item becomes the current item. The + current item is set to 0 if the list becomes empty. + + All list iterators that refer to the taken item will be set to + point to the new current item. + + \sa remove(), clear(), current() +*/ + +/*! + \fn type *QPtrList::take() + + \overload + + Takes the current item out of the list without deleting it (even + if \link setAutoDelete() auto-deletion\endlink is enabled). + + Returns a pointer to the item taken out of the list, or 0 if + the current item is 0. + + The item after the removed item becomes the new current list item + if the removed item is not the last item in the list. If the last + item is removed, the new last item becomes the current item. The + current item is set to 0 if the list becomes empty. + + All list iterators that refer to the taken item will be set to + point to the new current item. + + \sa remove(), clear(), current() +*/ + +/*! + \fn type *QPtrList::takeNode( QLNode *node ) + + Takes the \a node out of the list without deleting its item (even + if \link setAutoDelete() auto-deletion\endlink is enabled). + Returns a pointer to the item taken out of the list. + + This node must exist in the list, otherwise the program may crash. + + The first item in the list becomes the new current list item. + + All list iterators that refer to the taken item will be set to + point to the item succeeding this item or to the preceding item if + the taken item was the last item. + + \warning Do not call this function unless you are an expert. + + \sa removeNode(), currentNode() +*/ + +/*! + \fn void QPtrList::clear() + + Removes all items from the list. + + The removed items are deleted if \link setAutoDelete() + auto-deletion\endlink is enabled. + + All list iterators that access this list will be reset. + + \sa remove(), take(), setAutoDelete() +*/ + +/*! + \fn int QPtrList::find( const type *item ) + + Finds the first occurrence of \a item in the list. + + If the item is found, the list sets the current item to point to + the found item and returns the index of this item. If the item is + not found, the list sets the current item to 0, the current + index to -1, and returns -1. + + The compareItems() function is called when searching for the item + in the list. If compareItems() is not reimplemented, it is more + efficient to call findRef(). + + \sa findNext(), findRef(), compareItems(), current() +*/ + +/*! + \fn int QPtrList::findNext( const type *item ) + + Finds the next occurrence of \a item in the list, starting from + the current list item. + + If the item is found, the list sets the current item to point to + the found item and returns the index of this item. If the item is + not found, the list sets the current item to 0, the current + index to -1, and returns -1. + + The compareItems() function is called when searching for the item + in the list. If compareItems() is not reimplemented, it is more + efficient to call findNextRef(). + + \sa find(), findNextRef(), compareItems(), current() +*/ + +/*! + \fn int QPtrList::findRef( const type *item ) + + Finds the first occurrence of \a item in the list. + + If the item is found, the list sets the current item to point to + the found item and returns the index of this item. If the item is + not found, the list sets the current item to 0, the current + index to -1, and returns -1. + + Calling this function is much faster than find() because find() + compares \a item with each list item using compareItems(), whereas + this function only compares the pointers. + + \sa findNextRef(), find(), current() +*/ + +/*! + \fn int QPtrList::findNextRef( const type *item ) + + Finds the next occurrence of \a item in the list, starting from + the current list item. + + If the item is found, the list sets the current item to point to + the found item and returns the index of this item. If the item is + not found, the list sets the current item to 0, the current + index to -1, and returns -1. + + Calling this function is much faster than findNext() because + findNext() compares \a item with each list item using + compareItems(), whereas this function only compares the pointers. + + \sa findRef(), findNext(), current() +*/ + +/*! + \fn uint QPtrList::contains( const type *item ) const + + Returns the number of occurrences of \a item in the list. + + The compareItems() function is called when looking for the \a item + in the list. If compareItems() is not reimplemented, it is more + efficient to call containsRef(). + + This function does not affect the current list item. + + \sa containsRef(), compareItems() +*/ + +/*! + \fn uint QPtrList::containsRef( const type *item ) const + + Returns the number of occurrences of \a item in the list. + + Calling this function is much faster than contains() because + contains() compares \a item with each list item using + compareItems(), whereas his function only compares the pointers. + + This function does not affect the current list item. + + \sa contains() +*/ + +/*! + \fn type *QPtrList::at( uint index ) + + Returns a pointer to the item at position \a index in the list, or + 0 if the index is out of range. + + Sets the current list item to this item if \a index is valid. The + valid range is \c{0..(count() - 1)} inclusive. + + This function is very efficient. It starts scanning from the first + item, last item, or current item, whichever is closest to \a + index. + + \sa current() +*/ + +/*! + \fn int QPtrList::at() const + + \overload + + Returns the index of the current list item. The returned value is + -1 if the current item is 0. + + \sa current() +*/ + +/*! + \fn type *QPtrList::current() const + + Returns a pointer to the current list item. The current item may + be 0 (implies that the current index is -1). + + \sa at() +*/ + +/*! + \fn QLNode *QPtrList::currentNode() const + + Returns a pointer to the current list node. + + The node can be kept and removed later using removeNode(). The + advantage is that the item can be removed directly without + searching the list. + + \warning Do not call this function unless you are an expert. + + \sa removeNode(), takeNode(), current() +*/ + +/*! + \fn type *QPtrList::getFirst() const + + Returns a pointer to the first item in the list, or 0 if the list + is empty. + + This function does not affect the current list item. + + \sa first(), getLast() +*/ + +/*! + \fn type *QPtrList::getLast() const + + Returns a pointer to the last item in the list, or 0 if the list + is empty. + + This function does not affect the current list item. + + \sa last(), getFirst() +*/ + +/*! + \fn type *QPtrList::first() + + Returns a pointer to the first item in the list and makes this the + current list item; returns 0 if the list is empty. + + \sa getFirst(), last(), next(), prev(), current() +*/ + +/*! + \fn type *QPtrList::last() + + Returns a pointer to the last item in the list and makes this the + current list item; returns 0 if the list is empty. + + \sa getLast(), first(), next(), prev(), current() +*/ + +/*! + \fn type *QPtrList::next() + + Returns a pointer to the item succeeding the current item. Returns + 0 if the current item is 0 or equal to the last item. + + Makes the succeeding item current. If the current item before this + function call was the last item, the current item will be set to + 0. If the current item was 0, this function does nothing. + + \sa first(), last(), prev(), current() +*/ + +/*! + \fn type *QPtrList::prev() + + Returns a pointer to the item preceding the current item. Returns + 0 if the current item is 0 or equal to the first item. + + Makes the preceding item current. If the current item before this + function call was the first item, the current item will be set to + 0. If the current item was 0, this function does nothing. + + \sa first(), last(), next(), current() +*/ + +/*! + \fn void QPtrList::toVector( QGVector *vec ) const + + Stores all list items in the vector \a vec. + + The vector must be of the same item type, otherwise the result + will be undefined. +*/ + +/*! + \enum QPtrList::iterator + + \internal +*/ + +/*! + \enum QPtrList::Iterator + + \internal +*/ + +/*! + \enum QPtrList::ConstIterator + + \internal +*/ + +/*! + \enum QPtrList::const_iterator + + \internal +*/ + +/*! + \fn QPtrList::constBegin() const + + \internal +*/ + +/*! + \fn QPtrList::constEnd() const + + \internal +*/ + +/*! + \fn QPtrList::erase(Iterator) + + \internal +*/ + + +/***************************************************************************** + QPtrListIterator documentation + *****************************************************************************/ + +/*! + \class QPtrListIterator + \brief The QPtrListIterator class provides an iterator for + QPtrList collections. + + \ingroup collection + \ingroup tools + + Define a template instance QPtrListIterator\<X\> to create a list + iterator that operates on QPtrList\<X\> (list of X*). + + The following example is similar to the \link + qptrlist.html#example example in the QPtrList class documentation + \endlink, but it uses QPtrListIterator. The class Employee is + defined there. + + \code + QPtrList<Employee> list; + + list.append( new Employee("John", "Doe", 50000) ); + list.append( new Employee("Jane", "Williams", 80000) ); + list.append( new Employee("Tom", "Jones", 60000) ); + + QPtrListIterator<Employee> it( list ); + Employee *employee; + while ( (employee = it.current()) != 0 ) { + ++it; + cout << employee->surname().latin1() << ", " << + employee->forename().latin1() << " earns " << + employee->salary() << endl; + } + \endcode + + The output is + \code + Doe, John earns 50000 + Williams, Jane earns 80000 + Jones, Tom earns 60000 + \endcode + + Using a list iterator is a more robust way of traversing the list + than using the QPtrList member functions \link QPtrList::first() + first\endlink(), \link QPtrList::next() next\endlink(), \link + QPtrList::current() current\endlink(), etc., as many iterators can + traverse the same list independently. + + An iterator has its own current list item and can get the next and + previous list items. It doesn't modify the list in any way. + + When an item is removed from the list, all iterators that point to + that item are updated to point to QPtrList::current() instead to + avoid dangling references. + + \sa QPtrList +*/ + +/*! + \fn QPtrListIterator::QPtrListIterator( const QPtrList<type> &list ) + + Constructs an iterator for \a list. The current iterator item is + set to point on the first item in the \a list. +*/ + +/*! + \fn QPtrListIterator::~QPtrListIterator() + + Destroys the iterator. +*/ + +/*! + \fn uint QPtrListIterator::count() const + + Returns the number of items in the list this iterator operates on. + + \sa isEmpty() +*/ + +/*! + \fn bool QPtrListIterator::isEmpty() const + + Returns TRUE if the list is empty; otherwise returns FALSE. + + \sa count() +*/ + +/*! + \fn bool QPtrListIterator::atFirst() const + + Returns TRUE if the current iterator item is the first list item; + otherwise returns FALSE. + + \sa toFirst(), atLast() +*/ + +/*! + \fn bool QPtrListIterator::atLast() const + + Returns TRUE if the current iterator item is the last list item; + otherwise returns FALSE. + + \sa toLast(), atFirst() +*/ + +/*! + \fn type *QPtrListIterator::toFirst() + + Sets the current iterator item to point to the first list item and + returns a pointer to the item. Sets the current item to 0 and + returns 0 if the list is empty. + + \sa toLast(), atFirst() +*/ + +/*! + \fn type *QPtrListIterator::toLast() + + Sets the current iterator item to point to the last list item and + returns a pointer to the item. Sets the current item to 0 and + returns 0 if the list is empty. + + \sa toFirst(), atLast() +*/ + +/*! + \fn QPtrListIterator::operator type *() const + + Cast operator. Returns a pointer to the current iterator item. + Same as current(). +*/ + +/*! + \fn type *QPtrListIterator::operator*() + + Asterisk operator. Returns a pointer to the current iterator item. + Same as current(). +*/ + +/*! + \fn type *QPtrListIterator::current() const + + Returns a pointer to the current iterator item. If the iterator is + positioned before the first item in the list or after the last + item in the list, 0 is returned. +*/ + +/*! + \fn type *QPtrListIterator::operator()() + + Makes the succeeding item current and returns the original current + item. + + If the current iterator item was the last item in the list or if + it was 0, 0 is returned. +*/ + +/*! + \fn type *QPtrListIterator::operator++() + + Prefix ++ makes the succeeding item current and returns the new + current item. + + If the current iterator item was the last item in the list or if + it was 0, 0 is returned. +*/ + +/*! + \fn type *QPtrListIterator::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 list is empty, it + sets the current item to 0 and returns 0 +*/ + +/*! + \fn type *QPtrListIterator::operator--() + + Prefix - makes the preceding item current and returns the new + current item. + + If the current iterator item was the first item in the list or if + it was 0, 0 is returned. +*/ + +/*! + \fn type *QPtrListIterator::operator-=( uint jump ) + + Returns the item \a jump positions before the current item or 0 + if it is beyond the first item. Makes this the current item. +*/ + +/*! + \fn QPtrListIterator<type>& QPtrListIterator::operator=( const QPtrListIterator<type> &it ) + + Assignment. Makes a copy of the iterator \a it and returns a + reference to this iterator. +*/ + + +/***************************************************************************** + QStrList documentation + *****************************************************************************/ + +/*! + \class QStrList qstrlist.h + \brief The QStrList class provides a doubly-linked list of char*. + + \ingroup collection + \ingroup tools + \ingroup text + + If you want a string list of \l{QString}s use QStringList. + + This class is a QPtrList\<char\> instance (a list of char*). + + QStrList can make deep or shallow copies of the strings that are + inserted. + + A deep copy means that memory is allocated for the string and then + the string data is copied into that memory. A shallow copy is just + a copy of the pointer value and not of the string data itself. + + The disadvantage of shallow copies is that because a pointer can + be deleted only once, the program must put all strings in a + central place and know when it is safe to delete them (i.e. when + the strings are no longer referenced by other parts of the + program). This can make the program more complex. The advantage of + shallow copies is that they consume far less memory than deep + copies. It is also much faster to copy a pointer (typically 4 or 8 + bytes) than to copy string data. + + A QStrList that operates on deep copies will, by default, turn on + auto-deletion (see setAutoDelete()). Thus, by default QStrList + will deallocate any string copies it allocates. + + The virtual compareItems() function is reimplemented and does a + case-sensitive string comparison. The inSort() function will + insert strings in sorted order. In general it is fastest to insert + the strings as they come and sort() at the end; inSort() is useful + when you just have to add a few extra strings to an already sorted + list. + + The QStrListIterator class is an iterator for QStrList. +*/ + +/*! + \fn QStrList::QStrList( bool deepCopies ) + + Constructs an empty list of strings. Will make deep copies of all + inserted strings if \a deepCopies is TRUE, or use shallow copies + if \a deepCopies is FALSE. +*/ + +/*! + \fn QStrList::QStrList( const QStrList &list ) + + Constructs a copy of \a list. + + If \a list has deep copies, this list will also get deep copies. + Only the pointers are copied (shallow copy) if the other list does + not use deep copies. +*/ + +/*! + \fn QStrList::~QStrList() + + Destroys the list. All strings are removed. +*/ + +/*! + \fn QStrList& QStrList::operator=( const QStrList& list ) + + Assigns \a list to this list and returns a reference to this list. + + If \a list has deep copies, this list will also get deep copies. + Only the pointers are copied (shallow copy) if the other list does + not use deep copies. +*/ + + +/***************************************************************************** + QStrIList documentation + *****************************************************************************/ + +/*! + \class QStrIList qstrlist.h + \brief The QStrIList class provides a doubly-linked list of char* + with case-insensitive comparison. + + \ingroup collection + \ingroup tools + + This class is a QPtrList\<char\> instance (a list of char*). + + QStrIList is identical to QStrList except that the virtual + compareItems() function is reimplemented to compare strings + case-insensitively. The inSort() function inserts strings in a + sorted order. In general it is fastest to insert the strings as + they come and sort() at the end; inSort() is useful when you just + have to add a few extra strings to an already sorted list. + + The QStrListIterator class works for QStrIList. + + \sa QStringList +*/ + +/*! + \fn QStrIList::QStrIList( bool deepCopies ) + + Constructs a list of strings. Will make deep copies of all + inserted strings if \a deepCopies is TRUE, or use shallow copies + if \a deepCopies is FALSE. +*/ + +/*! + \fn QStrIList::~QStrIList() + + Destroys the list. All strings are removed. +*/ + +/*! + \fn int QPtrList::compareItems( QPtrCollection::Item item1, + QPtrCollection::Item item2 ) + + This virtual function compares two list items. + + Returns: + \list + \i zero if \a item1 == \a item2 + \i nonzero if \a item1 != \a item2 + \endlist + + This function returns \e int rather than \e bool so that + reimplementations can return three values and use it to sort by: + + \list + \i 0 if \a item1 == \a item2 + \i \> 0 (positive integer) if \a item1 \> \a item2 + \i \< 0 (negative integer) if \a item1 \< \a item2 + \endlist + + inSort() retquires that compareItems() is implemented as described + here. + + This function should not modify the list because some const + functions call compareItems(). + + The default implementation compares the pointers. +*/ + +/*! + \fn QDataStream& QPtrList::read( QDataStream& s, + QPtrCollection::Item& item ) + + Reads a list 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& QPtrList::write( QDataStream& s, + QPtrCollection::Item item ) const + + Writes a list item, \a item to the stream \a s and returns a + reference to the stream. + + The default implementation does nothing. + + \sa read() +*/ + +/*! \fn iterator QPtrList::begin() +\internal +*/ +/*! \fn const_iterator QPtrList::begin() const +\internal +*/ +/*! \fn iterator QPtrList::end() +\internal +*/ +/*! \fn const_iterator QPtrList::end() const +\internal +*/ + +/***************************************************************************** + QStrListIterator documentation + *****************************************************************************/ + +/*! + \class QStrListIterator qstrlist.h + \brief The QStrListIterator class is an iterator for the QStrList + and QStrIList classes. + + \ingroup tools + + This class is a QPtrListIterator\<char\> instance. It can traverse + the strings in the QStrList and QStrIList classes. +*/ + + +/***************************************************************************** + QPtrListAutoDelete documentation + *****************************************************************************/ +/* + \class QPtrListAutoDelete + \brief The QPtrListAutoDelete class is a template class that provides a list that auto-deletes its data. + + \ingroup collection + \ingroup tools + + A QPtrListAutoDelete is identical to a QPtrList with + setAutoDelete(TRUE). +*/ |