| 1 | /****************************************************************************
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| 2 | **
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| 3 | ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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| 4 | ** Contact: Qt Software Information ([email protected])
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| 5 | **
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| 6 | ** This file is part of the QtCore module of the Qt Toolkit.
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| 7 | **
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| 8 | ** $QT_BEGIN_LICENSE:LGPL$
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| 9 | ** Commercial Usage
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| 10 | ** Licensees holding valid Qt Commercial licenses may use this file in
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| 11 | ** accordance with the Qt Commercial License Agreement provided with the
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| 12 | ** Software or, alternatively, in accordance with the terms contained in
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| 13 | ** a written agreement between you and Nokia.
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| 14 | **
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| 15 | ** GNU Lesser General Public License Usage
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| 16 | ** Alternatively, this file may be used under the terms of the GNU Lesser
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| 17 | ** General Public License version 2.1 as published by the Free Software
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| 18 | ** Foundation and appearing in the file LICENSE.LGPL included in the
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| 19 | ** packaging of this file. Please review the following information to
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| 20 | ** ensure the GNU Lesser General Public License version 2.1 requirements
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| 21 | ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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| 22 | **
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| 23 | ** In addition, as a special exception, Nokia gives you certain
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| 24 | ** additional rights. These rights are described in the Nokia Qt LGPL
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| 25 | ** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
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| 26 | ** package.
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| 27 | **
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| 28 | ** GNU General Public License Usage
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| 29 | ** Alternatively, this file may be used under the terms of the GNU
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| 30 | ** General Public License version 3.0 as published by the Free Software
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| 31 | ** Foundation and appearing in the file LICENSE.GPL included in the
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| 32 | ** packaging of this file. Please review the following information to
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| 33 | ** ensure the GNU General Public License version 3.0 requirements will be
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| 34 | ** met: http://www.gnu.org/copyleft/gpl.html.
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| 35 | **
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| 36 | ** If you are unsure which license is appropriate for your use, please
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| 37 | ** contact the sales department at [email protected].
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| 38 | ** $QT_END_LICENSE$
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| 39 | **
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| 40 | ****************************************************************************/
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| 41 |
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| 42 | /*!
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| 43 | \class QStack
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| 44 | \brief The QStack class is a template class that provides a stack.
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| 45 |
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| 46 | \ingroup tools
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| 47 | \ingroup shared
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| 48 | \mainclass
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| 49 | \reentrant
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| 50 |
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| 51 | QStack\<T\> is one of Qt's generic \l{container classes}. It implements
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| 52 | a stack data structure for items of a same type.
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| 53 |
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| 54 | A stack is a last in, first out (LIFO) structure. Items are added
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| 55 | to the top of the stack using push() and retrieved from the top
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| 56 | using pop(). The top() function provides access to the topmost
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| 57 | item without removing it.
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| 58 |
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| 59 | Example:
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| 60 |
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| 61 | \snippet doc/src/snippets/qstack/main.cpp 0
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| 62 |
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| 63 | The example will output 3, 2, 1 in that order.
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| 64 |
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| 65 | QStack inherits from QVector. All of QVector's functionality also
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| 66 | applies to QStack. For example, you can use isEmpty() to test
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| 67 | whether the stack is empty, and you can traverse a QStack using
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| 68 | QVector's iterator classes (for example, QVectorIterator). But in
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| 69 | addition, QStack provides three convenience functions that make
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| 70 | it easy to implement LIFO semantics: push(), pop(), and top().
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| 71 |
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| 72 | QStack's value type must be an \l{assignable data type}. This
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| 73 | covers most data types that are commonly used, but the compiler
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| 74 | won't let you, for example, store a QWidget as a value; instead,
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| 75 | store a QWidget *.
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| 76 |
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| 77 | \sa QVector, QQueue
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| 78 | */
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| 79 |
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| 80 | /*!
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| 81 | \fn QStack::QStack()
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| 82 |
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| 83 | Constructs an empty stack.
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| 84 | */
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| 85 |
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| 86 | /*!
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| 87 | \fn QStack::~QStack()
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| 88 |
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| 89 | Destroys the stack. References to the values in the stack, and all
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| 90 | iterators over this stack, become invalid.
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| 91 | */
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| 92 |
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| 93 | /*!
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| 94 | \fn void QStack::push(const T& t)
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| 95 |
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| 96 | Adds element \a t to the top of the stack.
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| 97 |
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| 98 | This is the same as QVector::append().
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| 99 |
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| 100 | \sa pop(), top()
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| 101 | */
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| 102 |
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| 103 | /*!
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| 104 | \fn T& QStack::top()
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| 105 |
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| 106 | Returns a reference to the stack's top item. This function
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| 107 | assumes that the stack isn't empty.
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| 108 |
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| 109 | This is the same as QVector::last().
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| 110 |
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| 111 | \sa pop(), push(), isEmpty()
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| 112 | */
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| 113 |
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| 114 | /*!
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| 115 | \fn const T& QStack::top() const
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| 116 |
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| 117 | \overload
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| 118 |
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| 119 | \sa pop(), push()
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| 120 | */
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| 121 |
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| 122 | /*!
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| 123 | \fn T QStack::pop()
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| 124 |
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| 125 | Removes the top item from the stack and returns it. This function
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| 126 | assumes that the stack isn't empty.
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| 127 |
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| 128 | \sa top(), push(), isEmpty()
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| 129 | */
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