Path: utzoo!attcan!uunet!seismo!sundc!pitstop!sun!amdcad!ames!haven!ncifcrf!nlm-mcs!adm!smoke!gwyn
From: gwyn@smoke.ARPA (Doug Gwyn )
Newsgroups: comp.lang.c
Subject: Re: "Numerical Recipes in C" is nonportable code
Message-ID: <8470@smoke.ARPA>
Date: 9 Sep 88 06:57:47 GMT
References: <664@lindy.Stanford.EDU> <6758@megaron.arizona.edu> <718@gtx.com> <640@drilex.UUCP> <1429@ficc.uu.net>
Reply-To: gwyn@brl.arpa (Doug Gwyn (VLD/VMB) <gwyn>)
Organization: Ballistic Research Lab (BRL), APG, MD.
Lines: 11

In article <1429@ficc.uu.net> peter@ficc.uu.net (Peter da Silva) writes:
>What's to stop you from doing the following:
>	Generate code in an array.
>	Jump to the beginning of the array. *
>... I can't see how you could write a valid 'C' compiler that wouldn't
>let you violate this protection.

That's simple.  All the compiler has to do is detect any attempt to
use a data object as a function.  The only way to even attempt this in
standard C is via an explicit cast to a function pointer somewhere,
which is where the compiler would enforce the constraint.