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  • 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
	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