Xref: utzoo comp.lang.c++:13462 comp.lang.c:39298
Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!samsung!think.com!spool.mu.edu!uunet!taumet!steve
From: steve@taumet.com (Stephen Clamage)
Newsgroups: comp.lang.c++,comp.lang.c
Subject: Re: Pointers to functions
Message-ID: <730@taumet.com>
Date: 15 May 91 15:39:47 GMT
References: <AJ3U.91May14140642@wilbury.cs.virginia.edu>
Followup-To: comp.lang.c++
Organization: Taumetric Corporation, San Diego
Lines: 29

aj3u@wilbury.cs.virginia.edu (Asim Jalis) writes:

>What is the difference between these two (pf is a pointer to a
>function, and hello is a function):

>pf = hello;	
>and 
>pf = &hello;

There is no difference.  The oddity is this:  A function designator
appearing in an expression context is replaced by the address of the
function, making a pointer-to-function.  Attempts to take the address
of the function designator are ignored. So
	hello
	&hello
	&&&&&&&&&&&&&&&&hello
are all equivalent.

Similarly, when you dereference a pointer-to-function, you get a
function designator, which is replaced by pointer-to-function.
Consequently,
	pf()
	(*pf)()
	(****************pf)()
are all equivalent.

-- 

Steve Clamage, TauMetric Corp, steve@taumet.com