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** QPtrStack class documentation
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/*****************************************************************************
  QPtrStack documentation
 *****************************************************************************/

/*!
    \class QPtrStack qptrstack.h
    \brief The QPtrStack class is a template class that provides a stack.

    \ingroup tools

    QValueStack is an STL-compatible alternative to this class.

    Define a template instance QPtrStack\<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 QPtrCollection classes current() and
    remove() are provided; they both operate on the top().

    \sa QPtrList QPtrQueue
*/

/*!
    \fn QPtrStack::QPtrStack () 

    Creates an empty stack.
*/

/*!
    \fn QPtrStack::QPtrStack (const QPtrStack<type>& s) 

    Creates a stack by making a shallow copy of another stack \a s.
*/

/*!
    \fn QPtrStack::~QPtrStack () 

    Destroys the stack. All items will be deleted if autoDelete() is
    TRUE.
*/

/*!
    \fn QPtrStack<type>& QPtrStack::operator= (const QPtrStack<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 QPtrStack::isEmpty () const 

    Returns TRUE if the stack contains no elements; otherwise returns
    FALSE.
*/

/*!
    \fn void QPtrStack::push (const type* d) 

    Adds an element \a d to the top of the stack. Last in, first out.
*/

/*!
    \fn type* QPtrStack::pop () 

    Removes the top item from the stack and returns it. The stack must
    not be empty.
*/

/*!
    \fn bool QPtrStack::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 QPtrStack::clear()

    Removes all items from the stack, deleting them if autoDelete() is
    TRUE.

    \sa remove()
*/

/*!
    \fn uint QPtrStack::count() const

    Returns the number of items in the stack.

    \sa isEmpty()
*/

/*!
    \fn type* QPtrStack::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 QPtrStack::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* QPtrStack::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 QPtrStack::autoDelete() const

    The same as QPtrCollection::autoDelete().

    \sa setAutoDelete()
*/

/*!
    \fn void QPtrStack::setAutoDelete( bool enable ) 

    Defines whether this stack auto-deletes its contents. The same as
    QPtrCollection::setAutoDelete().

    If \a enable is TRUE the stack auto-deletes its contents; if \a
    enable is FALSE the stack does not delete its contents.
    
    \sa autoDelete()
*/

/*!
    \fn QDataStream& QPtrStack::read( QDataStream& s,
					QPtrCollection::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& QPtrStack::write( QDataStream& s,
					QPtrCollection::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()
*/