Pointers to functions

[Stephen Clamage]

aj3u at 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 at taumet.com