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| |
| /*! |
| \class QStack |
| \inmodule QtCore |
| \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 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 template<class T> void QStack<T>::swap(QStack<T> &other) |
| \since 4.8 |
| |
| Swaps stack \a other with this stack. This operation is very fast and |
| never fails. |
| */ |
| |
| /*! |
| \fn template<class T> void QStack<T>::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 template<class T> T& QStack<T>::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 template<class T> const T& QStack<T>::top() const |
| |
| \overload |
| |
| \sa pop(), push() |
| */ |
| |
| /*! |
| \fn template<class T> T QStack<T>::pop() |
| |
| Removes the top item from the stack and returns it. This function |
| assumes that the stack isn't empty. |
| |
| \sa top(), push(), isEmpty() |
| */ |