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/*!

    \class QStack

    \brief The QStack class is a template class that provides a stack.

    \ingroup tools

    \ingroup shared

    \reentrant

    QStack\<T\> is one of Qt's generic \l{container classes}. It implements

    a stack data structure for items of a same type.

    A stack is a last in, first out (LIFO) structure. Items are added

    to the top of the stack using push() and retrieved from the top

    using pop(). The top() function provides access to the topmost

    item without removing it.

    Example:

    \snippet doc/src/snippets/qstack/main.cpp 0

    The example will output 3, 2, 1 in that order.

    QStack inherits from QVector. All of QVector's functionality also

    applies to QStack. For example, you can use isEmpty() to test

    whether the stack is empty, and you can traverse a QStack using

    QVector's iterator classes (for example, QVectorIterator). But in

    addition, QStack provides three convenience functions that make

    it easy to implement LIFO semantics: push(), pop(), and top().

    QStack's value type must be an \l{assignable data type}. This

    covers most data types that are commonly used, but the compiler

    won't let you, for example, store a QWidget as a value; instead,

    store a QWidget *.

    \sa QVector, QQueue

*/

/*!

    \fn QStack::QStack()

    Constructs an empty stack.

*/

/*!

    \fn QStack::~QStack()

    Destroys the stack. References to the values in the stack, and all

    iterators over this stack, become invalid.

*/

/*!

    \fn void QStack::push(const T& t)

    Adds element \a t to the top of the stack.

    This is the same as QVector::append().

    \sa pop(), top()

*/

/*!

    \fn T& QStack::top()

    Returns a reference to the stack's top item. This function

    assumes that the stack isn't empty.

    This is the same as QVector::last().

    \sa pop(), push(), isEmpty()

*/

/*!

    \fn const T& QStack::top() const

    \overload

    \sa pop(), push()

*/

/*!

    \fn T QStack::pop()

    Removes the top item from the stack and returns it. This function

    assumes that the stack isn't empty.

    \sa top(), push(), isEmpty()

*/