如何在Qt中编写自己的收藏集？

Question

I'm writing some class which will act like a usual collection in QT:

class MyCollection
{
  MyElement & at(int) const;
  MyElement & operator[](int) const;
  int count() const;
};

Now I want to enumerate all elements in my new class with QT's foreach. What should I do to achieve this?

Answer 1

Qt (4.8 at least) uses (from foreach macro) a template wrapper class QForeachContainer (see qglobal.h ) to iterate over smth . Default implementation calls begin() / end() , but you can write your own specialization as well... or just implement iterator begin() , iterator end() members