Qt中foreach的用法

Ifyou just want to iterate over all the items in a container inorder, you can use Qt's foreachkeyword. The keyword is a Qt-specific addition to the C++ language,and is implemented using the preprocessor.

Its syntax is: foreach(variable, container) statement. Forexample, here's how to use foreachto iterate over aQLinkedList<QString>:

QLinkedList<QString> list;
 ...
 QString str;
 foreach (str, list)
     qDebug() << str;

如果你想有序迭代容器中的所有项可以使用关键字foreach，这是qt对C++的特定补充，并通过预处理器实现。他的语法是：foreach(variable, container)+语句；这儿varible就相当于varible=container.item,只不过这个item会从container的头遍历到尾罢了。

QLinkedList<QString> list;

QLinkedListIterator<QString> i(list);
 while (i.hasNext())
  qDebug() << i.next();

这两个语句达到的目的是一样的