Path: utzoo!news-server.csri.toronto.edu!cs.utexas.edu!usc!rpi!batcomputer!llenroc!cornell!uw-beaver!mit-eddie!eddie!aryeh
From: aryeh@eddie.mit.edu (Aryeh M. Weiss)
Newsgroups: comp.unix.programmer
Subject: Re: Recasting to a pointer to a function.
Keywords: C, casts, pointer to function
Message-ID: <1991Mar16.150554.25269@eddie.mit.edu>
Date: 16 Mar 91 15:05:54 GMT
References: <1991Mar14.155825.31@edwards-saftd-2.af.mil>
Sender: news@eddie.mit.edu (Usenet News)
Followup-To: comp.lang.c
Organization: MIT EE/CS Computer Facilities, Cambridge, MA
Lines: 14

In article <1991Mar14.155825.31@edwards-saftd-2.af.mil> elston@edwards-saftd-2.af.mil writes:
>We are trying to assign to a pointer to a function the value stored in a
>long (which on our system is the same size.)  We would like to recast the long
>into a function pointer.  Is there any method for doing this in 'C'?
>We tried the following

The ``proper'' way is not to do it at all, but rewrite your app into
a portable form, or to use a union like
	union { long x; (int *p)(); } temp;
but you already know that.

The correct form of the cast is

	dbp = (int (*)()) lvar;