QQueue Class

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

头文件:	#include <QQueue>
qmake:	QT += core
基类:	QList

所有的成员列表, 包括继承的成员

Note: All functions in this class are reentrant.

公有函数

T	dequeue()
void	enqueue(const T &t)
T &	head()
const T &	head() const
void	swap(QQueue<T> &other)

78 个公有函数继承自 QList

其他继承的成员

3 个静态公有成员继承自 QList

详细描述

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

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:


  QQueue<int> queue;
  queue.enqueue(1);
  queue.enqueue(2);
  queue.enqueue(3);
  while (!queue.isEmpty())
      cout << queue.dequeue() << 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.

参见 QList and QStack.

成员函数

T QQueue::dequeue()

Removes the head item in the queue and returns it. This function assumes that the queue isn't empty.

This is the same as QList::takeFirst().

参见 head(), enqueue(), and isEmpty().

void QQueue::enqueue(const T &t)

Adds value t to the tail of the queue.

This is the same as QList::append().

参见 dequeue() and head().

T &QQueue::head()

Returns a reference to the queue's head item. This function assumes that the queue isn't empty.

This is the same as QList::first().

参见 dequeue(), enqueue(), and isEmpty().

const T &QQueue::head() const

This is an overloaded function.

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.

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