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From: | cwr AT cts DOT com (Will Rose) |
Newsgroups: | comp.lang.c,comp.os.msdos.djgpp |
Subject: | Re: Casting void pointers |
Followup-To: | comp.lang.c,comp.os.msdos.djgpp |
Date: | 23 Jun 1998 00:19:17 GMT |
Organization: | CTS Network Services (CTSNET), San Diego, CA |
Lines: | 33 |
Message-ID: | <898561284.92944@optional.cts.com> |
References: | <6mkaos$k7o AT dfw-ixnews6 DOT ix DOT netcom DOT com> <358DC1FA DOT 443E297D AT cs DOT com> <898511636snz AT genesis DOT demon DOT co DOT uk> |
NNTP-Posting-Host: | optional.cts.com |
Cache-Post-Path: | optional.cts.com!cwr AT crash-i2 DOT cts DOT com |
To: | djgpp AT delorie DOT com |
DJ-Gateway: | from newsgroup comp.os.msdos.djgpp |
Lawrence Kirby (fred AT genesis DOT demon DOT co DOT uk) wrote: : In article <358DC1FA DOT 443E297D AT cs DOT com> fighteer AT cs DOT com "John M. Aldrich" writes: : ... : >#include <stdio.h> : > : >int foo( int x ) : >{ : > return x + 10; : >} : > : >int main( void ) : >{ : > void *vp = foo; : Your compiler should have generated a diagnostic for this. The C language : requires a cast to convert between void * and function pointers (in both : directions). Note that C doesn't guarantee that a void * object can properly : hold a funciton pointer. You should avoid doing this. OTOH, I think: int main(void) { void (*p)(void) = (void (*)(void)) &foo; should work. I think the & operator is un-necessary on modern compilers. Will cwr AT crash DOT cts DOT com
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