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From: pete@TIRS.oz.au (Peter Bartel)
Newsgroups: comp.lang.c++,comp.windows.open-look
Subject: Passing member functions
Message-ID: <1991May24.052811.10218@TIRS.oz.au>
Date: 24 May 91 05:28:11 GMT
Organization: International Railroad Systems (Electronics)
Lines: 38

When writing an XView program with C++, you can specify a function to
be called when a button is pressed by:
    
    class my_class {
	virtual void member_func1(void);
    }; 

    void my_class::member_func1(void)
    {
	extern void callback_routine(Panel_item, Event*);
	xv_set(button, PANEL_NOTIFY_PROC, callback_routine);
    }

In the above case, callback_routine is an ordinary function; not a member 
of any class. My question is: how do I tell XView to use a member function
as the panel notify procedure? What I want is something similar to the
following (which doesn't work).

    class my_class {
	virtual void member_func1(void);
	virtual void member_func2(Panel_item, Event*);
    };

    void my_class::member_func1(void)
    {
	xv_set(button, PANEL_NOTIFY_PROC, member_func2);
    }

    void my_class::member_func2(Panel_item item, Event *event)
    {
	fprintf(stderr, "hello");
    } 
_______________________________________________________________________
Peter Bartel	Senior Software Engineer	International
Phone:		+61-8-232-1740			Railroad
Faxstream:	+61-8-232-2274			Systems
E-mail:		pete@TIRS.oz.au			(Electronics)
Snail:		209-217 Wakefield St, Adelaide, South Australia, 5000