/**************************************************************************** ** ** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies). ** Contact: http://www.qt-project.org/legal ** ** This file is part of the documentation of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:LGPL$ ** Commercial License Usage ** Licensees holding valid commercial Qt licenses may use this file in ** accordance with the commercial license agreement provided with the ** Software or, alternatively, in accordance with the terms contained in ** a written agreement between you and Digia. For licensing terms and ** conditions see http://qt.digia.com/licensing. For further information ** use the contact form at http://qt.digia.com/contact-us. ** ** 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, Digia gives you certain additional ** rights. These rights are described in the Digia Qt LGPL Exception ** version 1.1, 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. ** ** ** $QT_END_LICENSE$ ** ****************************************************************************/ /*! \class Q3PtrStack \brief The Q3PtrStack class is a template class that provides a stack. \compat Q3ValueStack is an STL-compatible alternative to this class. Define a template instance Q3PtrStack\ to create a stack that operates on pointers to X, (X*). A stack is a last in, first out (LIFO) structure. Items are added to the top of the stack with push() and retrieved from the top with pop(). Use top() to get a reference to the top element without changing the stack. You can control the stack's deletion policy with setAutoDelete(). For compatibility with the Q3PtrCollection classes current() and remove() are provided; they both operate on the top(). \sa Q3PtrList Q3PtrQueue */ /*! \fn Q3PtrStack::Q3PtrStack () Creates an empty stack. */ /*! \fn Q3PtrStack::Q3PtrStack (const Q3PtrStack& s) Creates a stack by making a shallow copy of another stack \a s. */ /*! \fn Q3PtrStack::~Q3PtrStack () Destroys the stack. All items will be deleted if autoDelete() is true. */ /*! \fn Q3PtrStack& Q3PtrStack::operator= (const Q3PtrStack& s) Sets the contents of this stack by making a shallow copy of another stack \a s. Elements currently in this stack will be deleted if autoDelete() is true. */ /*! \fn bool Q3PtrStack::isEmpty () const Returns true if the stack contains no elements; otherwise returns false. */ /*! \fn void Q3PtrStack::push (const type* d) Adds an element \a d to the top of the stack. Last in, first out. */ /*! \fn type* Q3PtrStack::pop () Removes the top item from the stack and returns it. The stack must not be empty. */ /*! \fn bool Q3PtrStack::remove () Removes the top item from the stack and deletes it if autoDelete() is true. Returns true if there was an item to pop; otherwise returns false. \sa clear() */ /*! \fn void Q3PtrStack::clear() Removes all items from the stack, deleting them if autoDelete() is true. \sa remove() */ /*! \fn uint Q3PtrStack::count() const Returns the number of items in the stack. \sa isEmpty() */ /*! \fn type* Q3PtrStack::top () const Returns a pointer to the top item on the stack (most recently pushed). The stack is not changed. Returns 0 if the stack is empty. */ /*! \fn Q3PtrStack::operator type* ()const Returns a pointer to the top item on the stack (most recently pushed). The stack is not changed. Returns 0 if the stack is empty. */ /*! \fn type* Q3PtrStack::current () const Returns a pointer to the top item on the stack (most recently pushed). The stack is not changed. Returns 0 if the stack is empty. */ /*! \fn bool Q3PtrStack::autoDelete() const The same as Q3PtrCollection::autoDelete(). Returns true if the auto-delete option is set. If the option is set, the stack auto-deletes its contents. \sa setAutoDelete() */ /*! \fn void Q3PtrStack::setAutoDelete(bool enable) Defines whether this stack auto-deletes its contents. The same as Q3PtrCollection::setAutoDelete(). If \a enable is true, auto-delete is turned on. If auto-deleting is turned on, all the items in the stack are deleted when the stack itself is deleted. This is convenient if the stack has the only pointers to the items. The default setting is false, for safety. If you turn it on, be careful about copying the stack, or you might find yourself with two stacks deleting the same items. Note that the auto-delete setting may also affect other functions in subclasses. For example, a subclass that has a remove() function will remove the item from its data structure, and if auto-delete is enabled, will also delete the item. \sa autoDelete() */ /*! \fn QDataStream& Q3PtrStack::read(QDataStream& s, Q3PtrCollection::Item& item) Reads a stack item, \a 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& Q3PtrStack::write(QDataStream& s, Q3PtrCollection::Item item) const Writes a stack item, \a item, to the stream \a s and returns a reference to the stream. The default implementation does nothing. \sa read() */