The QStack class is a template class that provides a stack. More...
#include <QStack>
Inherits: QVector<T>.
Note: All functions in this class are reentrant.
QStack () | |
~QStack () | |
T | pop () |
void | push ( const T & t ) |
T & | top () |
const T & | top () const |
The QStack class is a template class that provides a stack.
QStack<T> is one of Qt's generic 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:
QStack<int> stack; stack.push(1); stack.push(2); stack.push(3); while (!stack.isEmpty()) cout << stack.pop() << endl;
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 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 *.
Constructs an empty stack.
Destroys the stack. References to the values in the stack, and all iterators over this stack, become invalid.
Removes the top item from the stack and returns it. This function assumes that the stack isn't empty.
See also top(), push(), and isEmpty().
Adds element t to the top of the stack.
This is the same as QVector::append().
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().
See also pop(), push(), and isEmpty().
This is an overloaded function.
© 2008-2011 Nokia Corporation and/or its subsidiaries. Nokia, Qt and their respective logos are trademarks of Nokia Corporation in Finland and/or other countries worldwide.
All other trademarks are property of their respective owners. Privacy Policy
Licensees holding valid Qt Commercial licenses may use this document in accordance with the Qt Commercial License Agreement provided with the Software or, alternatively, in accordance with the terms contained in a written agreement between you and Nokia.
Alternatively, this document may be used under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation.