Responder

• A Responder is a simple abstraction for handling callbacks that have data associated with them.
• The responder has two essential properties:
  • It is ref counted so that it gets destroyed when both the responder and the respondee are finished with it
  • It has a virtual 'completed' function that is called by the responder and implemented by the respondee
• Simple example:

class LLResponder : public LLThreadSafeRefCount
{
public:
	virtual ~LLResponder();
	virtual void completed(bool success) = 0;
};

class MyResponder : public LLResponder; // contains private data and overrides completed()

make_a_request("foo", new MyResponder(mydata)}; // when the request completes, MyResponder::completed() will get called