IdentifiantMot de passe
Loading...
Mot de passe oublié ?Je m'inscris ! (gratuit)

QQueue Class

The QQueue class is a generic container that provides a queue.

All functions in this class are reentrant.

Article lu   fois.

L'auteur

Liens sociaux

Viadeo Twitter Facebook Share on Google+   

QQueue Class

Detailed Description

QQueue<T> is one of Qt's generic container classes. It implements a queue data structure for items of a same type.

A queue is a first in, first out (FIFO) structure. Items are added to the tail of the queue using enqueue() and retrieved from the head using dequeue(). The head() function provides access to the head item without removing it.

Example:

 
Sélectionnez
QQueue&lt;int&gt; queue;
queue.enqueue(1);
queue.enqueue(2);
queue.enqueue(3);
while (!queue.isEmpty())
    cout &lt;&lt; queue.dequeue() &lt;&lt; endl;

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

QQueue inherits from QList. All of QList's functionality also applies to QQueue. For example, you can use isEmpty() to test whether the queue is empty, and you can traverse a QQueue using QList's iterator classes (for example, QListIterator). But in addition, QQueue provides three convenience functions that make it easy to implement FIFO semantics: enqueue(), dequeue(), and head().

QQueue'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. Use QWidget* instead.

See Also

See also QList, QStack

Member Function Documentation

 

[since 4.8] void QQueue::swap(QQueue<T> &other)

Swaps queue other with this queue. This operation is very fast and never fails.

This function was introduced in Qt 4.8.

Vous avez aimé ce tutoriel ? Alors partagez-le en cliquant sur les boutons suivants : Viadeo Twitter Facebook Share on Google+