this is a gcc file, you can download it and learn its usetility, for further detail please look at t

				// Build don't link: 				// GROUPS passed arg-matching				// arg-matching file				// Message-Id: 				// From: Warner Losh 				// Subject: Overloading bug in g++ 2.3.3 (sparc) compiled by GNU C version 2.3.3				// Date: Wed, 03 Mar 1993 14:14:02 MST								class c1 { };								typedef void    (*fnp)(void *);				typedef void    (c1::*memfnp)(void *);				extern  void    fn1( fnp );				extern  void    fn1( c1*, memfnp );								void f3(void *) { }								void fn2()				{				        fn1((fnp) &f3);         // Everybody likes this				        fn1(&f3);               // g++ complains here  line 13				}