Path: utzoo!utgpu!water!watmath!clyde!rutgers!gatech!mcnc!decvax!decwrl!pyramid!prls!philabs!pwa-b!mmintl!franka
From: franka@mmintl.UUCP (Frank Adams)
Newsgroups: comp.lang.c++
Subject: Re: C++ enhancements
Message-ID: <2787@mmintl.UUCP>
Date: 25 Mar 88 18:02:50 GMT
References: <2781@mmintl.UUCP> <7757@apple.Apple.Com>
Reply-To: franka@mmintl.UUCP (Frank Adams)
Organization: Ashton-Tate Corporation, East Hartford Development Center
Lines: 27

In article <7757@apple.Apple.Com> lsr@apple.UUCP (Larry Rosenstein) writes:
>Another (unrelated) addition I would like to see is something like a delayed
>method call.  My idea would be to package up an object and a virtual
>function name into an Invocation object.  These objects could be passed
>around and stored, and at some later time you could cause the function to be
>called with the given object.  (Suppose that the function takes no
>parameters.)

class deferred {
public:
	object *receiver;
	void (* action)(object *);

	deferred(object *thing, void (* act)(object *)) {
		receiver = thing; action = act;}
	inline void do_it() {(*action)(receiver);}
};

If the function is virtual, you may have to do something like:

	deferred button(it, &it->zoom);

but I think this works.
-- 

Frank Adams                           ihnp4!philabs!pwa-b!mmintl!franka
Ashton-Tate          52 Oakland Ave North         E. Hartford, CT 06108