Question

How can I do this in C++

interface ActionListener { void actionPerformed(); }
jButton.addActionListener(
    new ActionListener(){ void actionPerformed() { do something } }
);

So far I know this,

class ActionListener {
  public : 
    virtual ~ActionListener(){}
    virtual void actionPerformed() = 0;
}

After this what do I do … any keywords to do this kind of implemention would also help.

Answer 1

C++ doesn’t really have anonymous classes like you find in Java. The usual thing is just to declare a subclass that inherits from the interface class. The closest you come to Java’s anonymous class instance is something like this:

class : public ActionListener {
public:
    virtual void actionPerformed() {
        // do something
    }
} listener;
thing.addActionListener( listener );