Xref:	news2.mv.net comp.os.msdos.djgpp:8594
From:	Erik Max Francis <max AT alcyone DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: function pointers
Date:	Thu, 12 Sep 1996 08:06:15 -0700
Organization:	Alcyone Systems
Lines:	34
Message-ID:	<323826E7.21719469@alcyone.com>
References:	<517hq2$hqp AT news DOT ghgcorp DOT com>
NNTP-Posting-Host:	newton.alcyone.com
Mime-Version:	1.0
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Jeff wrote:

> I know there is a way to do this in DJGPP 2.0, can somebody just tell me
> how?

This will work in any ANSI C compiler:

/* funcptr is a function pointer which takes two ints and has no return */
    typedef void (*funcptr)(int, int);

/* Here's a prototype for a real function which will assign to our function 
pointer */
    extern void sampleFunction(int x, int y);

/* Declare a function pointer */
    funcptr fp;

/* Assign it -- any reference to a function name without the call operator 
() decays to a function pointer of that type */
    fp = sampleFunction;

/* Now call it */
    fp(12, 13);

/* Note that the following is also exactly equivalent to the above; 
dereferencing function pointers is ignored, but is sometimes useful if 
you want to emphasize that it's a function pointer you're using */
    (*fp)(12, 13);


-- 
Erik Max Francis, &tSftDotIotE   http://www.alcyone.com/max/   max AT alcyone DOT com
San Jose, California   ICBM 37 20 07 N 121 53 38 W   R^4: the 4th R is respect
"Out from his breast/his soul went to seek/the doom of the just." -- _Beowulf_

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