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/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtCore module 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 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::swap(QStack<T> &other)
\since 4.8
Swaps stack \a other with this stack. This operation is very fast and
never fails.
*/
/*!
\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()
*/
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