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+/****************************************************************************
+**
+** Copyright (C) 2011 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 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\<X\> 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<type>& 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<type>& Q3PtrStack::operator= (const Q3PtrStack<type>& 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()
+*/